import React, { forwardRef, useEffect, useImperativeHandle, useMemo, useRef } from 'react';

import type {
  EffectInstance,
  EffectInstanceType,
  EffectsState,
  EffectToolType,
} from '../../../shared/types/effects';

import styles from './PxiEffectsOverlay.module.css';

export type PixiEffectsOverlayHandle = {
  /** Draft-штрих без React re-render родителя; null — сброс. */
  setDraft: (instance: EffectInstance | null) => void;
};

/** Наборы кадровых VFX — подгружаем только по tool / живым instances. */
type VfxFramePack =
  | 'fog'
  | 'fire'
  | 'rain'
  | 'water'
  | 'lightning'
  | 'sunbeam'
  | 'poisonCloud';

function mergeDraftState(
  state: EffectsState | null,
  draft: EffectInstance | null,
): EffectsState | null {
  if (!draft) return state;
  if (!state) {
    return {
      revision: 0,
      serverNowMs: Date.now(),
      tool: { tool: 'fog', radiusN: 0.05, intensity: 1 },
      instances: [draft],
    };
  }
  const rest = state.instances.filter((i) => i.id !== '__draft__');
  return { ...state, instances: [...rest, draft] };
}

function vfxPacksForTool(tool: EffectToolType): readonly VfxFramePack[] {
  switch (tool) {
    case 'fog':
      return ['fog'];
    case 'fire':
      return ['fire'];
    case 'rain':
      return ['rain'];
    case 'water':
      return ['water'];
    case 'lightning':
      return ['lightning'];
    case 'sunbeam':
      return ['sunbeam'];
    case 'poisonCloud':
      return ['poisonCloud'];
    default:
      return [];
  }
}

function vfxPacksForInstanceType(type: EffectInstanceType): readonly VfxFramePack[] {
  switch (type) {
    case 'fog':
      return ['fog'];
    case 'fire':
      return ['fire'];
    case 'rain':
      return ['rain'];
    case 'water':
      return ['water'];
    case 'lightning':
      return ['lightning'];
    case 'sunbeam':
      return ['sunbeam'];
    case 'poisonCloud':
      return ['poisonCloud'];
    default:
      return [];
  }
}

function collectNeededVfxPacks(state: EffectsState | null): VfxFramePack[] {
  if (!state) return [];
  const packs = new Set<VfxFramePack>();
  for (const p of vfxPacksForTool(state.tool.tool)) packs.add(p);
  for (const inst of state.instances) {
    for (const p of vfxPacksForInstanceType(inst.type)) packs.add(p);
  }
  return [...packs];
}

function preloadVfxFramePack(pixi: any, pack: VfxFramePack): void {
  switch (pack) {
    case 'fog':
      void preloadFogVfxFrameTextures(pixi);
      break;
    case 'fire':
      void preloadGroundFireVfxFrameTextures(pixi);
      break;
    case 'rain':
      void preloadRainVfxFrameTextures(pixi);
      break;
    case 'water':
      void preloadWaterVfxFrameTextures(pixi);
      break;
    case 'lightning':
      void preloadLightningVfxFrameTextures(pixi);
      void preloadElectricAccentFrameTextures(pixi);
      break;
    case 'sunbeam':
      void preloadPulseDischargeFrameTextures(pixi);
      break;
    case 'poisonCloud':
      void preloadDustBurstFrameTextures(pixi);
      break;
    default: {
      const _exhaustive: never = pack;
      void _exhaustive;
    }
  }
}

function ensureVfxPacksForState(pixi: any, state: EffectsState | null): void {
  if (!pixi) return;
  for (const pack of collectNeededVfxPacks(state)) {
    preloadVfxFramePack(pixi, pack);
  }
}

function effectsHaveWork(state: EffectsState | null): boolean {
  return Boolean(state && state.instances.length > 0);
}

const LIGHTNING_VFX_FRAME_COUNT = 19;
const LIGHTNING_VFX_FRAME_ASPECT = 420 / 473;
const LIGHTNING_VFX_STRIKE_MS = 320;
const LIGHTNING_VFX_IMPACT_ANCHOR_Y = 437 / 473;
const ELECTRIC_ACCENT_START_MS = 8;
const ELECTRIC_ACCENT_DURATION_MS = 740;
const ELECTRIC_ACCENT_FRAME_COUNT = 10;
const ELECTRIC_ACCENT_FRAME_ASPECT = 480 / 360;
const FOG_VFX_FRAME_COUNT = 40;
const FOG_VFX_LOOP_MS = 5000;
const GROUND_FIRE_VFX_FRAME_COUNT = 40;
const GROUND_FIRE_VFX_FRAME_ASPECT = 872 / 480;
const GROUND_FIRE_VFX_LOOP_MS = 3333;
const RAIN_VFX_FRAME_COUNT = 45;
const RAIN_VFX_FRAME_ASPECT = 640 / 360;
const RAIN_VFX_LOOP_MS = 3000;
const WATER_VFX_FRAME_COUNT = 48;
const WATER_VFX_LOOP_MS = 2400;
const PULSE_DISCHARGE_VFX_FRAME_COUNT = 44;
const PULSE_DISCHARGE_VFX_FRAME_ASPECT = 960 / 540;
const PULSE_DISCHARGE_VFX_DURATION_MS = 2933;
const PULSE_DISCHARGE_IMPACT_ANCHOR_X = 0.885;
const PULSE_DISCHARGE_IMPACT_ANCHOR_Y = 0.49;
const DUST_BURST_VFX_FRAME_COUNT = 76;
const DUST_BURST_VFX_FRAME_ASPECT = 480 / 270;
const DUST_BURST_VFX_DURATION_MS = 5067;
const lightningVfxFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const electricAccentFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const fogVfxFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const groundFireVfxFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const rainVfxFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const waterVfxFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const pulseDischargeFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();
const dustBurstFrameTextureCache = new WeakMap<object, { textures: any[]; loading?: Promise<any[]> }>();

type Props = {
  state: EffectsState | null;
  interactive?: boolean;
  style?: React.CSSProperties;
  /** Область “контента” внутри контейнера (например при object-fit: contain). */
  viewport?: { x: number; y: number; w: number; h: number } | undefined;
};

/**
 * Учебная идея:
 * - Pixi `Application` — это WebGL-рендерер + тикер.
 * - Мы держим один `Application` на компонент, и при изменении `state` просто перерисовываем сцену.
 * - Вариант A: рисуем "инстансы эффектов" (данные), а не пиксели.
 * - Draft кисти идёт через `setDraft` (imperative), без re-render ControlApp.
 */
export const PixiEffectsOverlay = forwardRef<PixiEffectsOverlayHandle, Props>(function PixiEffectsOverlay(
  { state, interactive = false, style, viewport },
  ref,
) {
  const hostRef = useRef<HTMLDivElement | null>(null);
  const appRef = useRef<any>(null);
  const rootRef = useRef<any>(null);
  const pixiRef = useRef<any>(null);
  const nodesRef = useRef<Map<string, any>>(new Map());
  const committedStateRef = useRef<EffectsState | null>(null);
  const draftRef = useRef<EffectInstance | null>(null);
  const stateRef = useRef<EffectsState | null>(null);
  const timeOffsetRef = useRef(0);
  const sizeRef = useRef<{ w: number; h: number }>({ w: 1, h: 1 });
  const viewportRef = useRef<{ x: number; y: number; w: number; h: number }>({ x: 0, y: 0, w: 1, h: 1 });
  const viewportProvidedRef = useRef(false);
  /** null = ещё не синхронизировали с Pixi (ticker по умолчанию бежит). */
  const tickerWantedRef = useRef<boolean | null>(null);

  const syncTickerForState = (merged: EffectsState | null): void => {
    const app = appRef.current;
    if (!app?.ticker) return;
    const want = effectsHaveWork(merged);
    if (tickerWantedRef.current === want) return;
    tickerWantedRef.current = want;
    if (want) {
      try {
        app.ticker.start();
      } catch {
        /* ignore */
      }
      return;
    }
    const root = rootRef.current;
    if (root) {
      root.x = 0;
      root.y = 0;
    }
    // Без этого кадра после syncNodes (clear) canvas остаётся со старым кадром:
    // анимация «встаёт», но спрайты визуально не исчезают.
    try {
      app.render?.();
    } catch {
      /* ignore */
    }
    try {
      app.ticker.stop();
    } catch {
      /* ignore */
    }
  };

  const applyMergedState = (committed: EffectsState | null, draft: EffectInstance | null): void => {
    committedStateRef.current = committed;
    draftRef.current = draft;
    const merged = mergeDraftState(committed, draft);
    stateRef.current = merged;
    if (merged) {
      timeOffsetRef.current = merged.serverNowMs - Date.now();
    }
    const pixi = pixiRef.current;
    const root = rootRef.current;
    if (!pixi || !root) {
      syncTickerForState(merged);
      return;
    }
    ensureVfxPacksForState(pixi, merged);
    syncNodes(pixi, root, nodesRef.current, merged, sizeRef.current, viewportRef.current);
    syncTickerForState(merged);
  };

  useImperativeHandle(
    ref,
    () => ({
      setDraft: (instance) => {
        applyMergedState(committedStateRef.current, instance);
      },
    }),
    [],
  );

  /** Снижаем resolution на HiDPI — меньше пикселей в WebGL, визуально ок для оверлея эффектов. */
  const dpr = useMemo(() => Math.min(1.5, window.devicePixelRatio || 1), []);

  useEffect(() => {
    const host = hostRef.current;
    if (!host) return;

    let destroyed = false;
    let resizeRaf = 0;
    let app: any = null;
    let cleanup: (() => void) | null = null;
    void (async () => {
      try {
        const pixi = await import('pixi.js');
        pixiRef.current = pixi;
        if (destroyed) return;
        app = new pixi.Application();
        await app.init({
          backgroundAlpha: 0,
          antialias: false,
          powerPreference: 'high-performance',
          resolution: dpr,
          autoDensity: true,
          preference: 'webgl',
        });
        // Меньше кадров — меньше CPU/GPU; анимации эффектов остаются плавными.
        app.ticker.maxFPS = 32;
        if (destroyed) return;
        host.appendChild(app.canvas);
        // Canvas по умолчанию перехватывает hit-test; оставляем клики «сквозь» оверлей для слоя кисти сверху.
        app.canvas.style.pointerEvents = interactive ? 'auto' : 'none';
        appRef.current = app;
        const root = new pixi.Container();
        rootRef.current = root;
        app.stage.addChild(root);

        const ro = new ResizeObserver(() => {
          cancelAnimationFrame(resizeRaf);
          resizeRaf = requestAnimationFrame(() => {
            const r = host.getBoundingClientRect();
            app.renderer.resize(Math.max(1, Math.floor(r.width)), Math.max(1, Math.floor(r.height)));
            sizeRef.current = { w: app.renderer.width, h: app.renderer.height };
            if (!viewportProvidedRef.current) {
              viewportRef.current = { x: 0, y: 0, w: sizeRef.current.w, h: sizeRef.current.h };
            }
            syncNodes(pixi, root, nodesRef.current, stateRef.current, sizeRef.current, viewportRef.current);
          });
        });
        ro.observe(host);

        const r = host.getBoundingClientRect();
        app.renderer.resize(Math.max(1, Math.floor(r.width)), Math.max(1, Math.floor(r.height)));
        sizeRef.current = { w: app.renderer.width, h: app.renderer.height };
        if (!viewportProvidedRef.current) {
          viewportRef.current = { x: 0, y: 0, w: sizeRef.current.w, h: sizeRef.current.h };
        }
        // Lazy VFX: только pack'и для текущего tool / уже размещённых instances (не все наборы сразу).
        ensureVfxPacksForState(pixi, stateRef.current);
        syncNodes(pixi, root, nodesRef.current, stateRef.current, sizeRef.current, viewportRef.current);

        // Animation loop: на каждом кадре обновляем свойства инстансов (alpha/дрейф/фликер).
        // В idle (нет instances/draft) ticker останавливается — см. syncTickerForState.
        app.ticker.add(() => {
          const s = stateRef.current;
          if (!s || s.instances.length === 0) return;
          const nowMs = Date.now() + timeOffsetRef.current;
          animateNodes(pixi, nodesRef.current, s, nowMs, sizeRef.current, viewportRef.current);

          // Лёгкое “потряхивание” сцены в момент удара молнии.
          // Делаем через смещение корневого контейнера, чтобы не вмешиваться в рендерер/камера-логику.
          const rootNode = rootRef.current;
          if (rootNode) {
            const { x, y } = computeSceneShake(s, nowMs, sizeRef.current);
            rootNode.x = x;
            rootNode.y = y;
          }
        });
        syncTickerForState(stateRef.current);

        cleanup = () => ro.disconnect();
      } catch (e) {
        // Если Pixi/WebGL не поднялись, не ломаем всё приложение.
        // Эффекты просто не будут отображаться, но UI останется живым.
        console.error('[effects] Pixi init failed', e);
      }
    })();

    return () => {
      destroyed = true;
      cancelAnimationFrame(resizeRaf);
      cleanup?.();
      const a = appRef.current;
      appRef.current = null;
      rootRef.current = null;
      if (a) {
        a.destroy(true, { children: true });
      }
      host.replaceChildren();
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  useEffect(() => {
    const host = hostRef.current;
    if (!host) return;
    const canvas = host.querySelector('canvas');
    if (canvas instanceof HTMLCanvasElement) {
      canvas.style.pointerEvents = interactive ? 'auto' : 'none';
    }
  }, [interactive]);

  useEffect(() => {
    applyMergedState(state, draftRef.current);
  }, [state]);

  useEffect(() => {
    // Если viewport не задан — используем “весь холст”.
    viewportProvidedRef.current = Boolean(viewport);
    if (viewport) viewportRef.current = viewport;
    else viewportRef.current = { x: 0, y: 0, w: sizeRef.current.w, h: sizeRef.current.h };
    const pixi = pixiRef.current;
    const root = rootRef.current;
    if (!pixi || !root) return;
    syncNodes(pixi, root, nodesRef.current, stateRef.current, sizeRef.current, viewportRef.current);
  }, [viewport]);

  const hostClass = [styles.host, interactive ? styles.hostInteractive : styles.hostPassthrough].join(' ');

  return <div ref={hostRef} className={hostClass} style={style} />;
});

function syncNodes(
  pixi: any,
  root: any,
  nodes: Map<string, any>,
  state: EffectsState | null,
  size: { w: number; h: number },
  viewport: { x: number; y: number; w: number; h: number },
) {
  const nowMs = state?.serverNowMs ?? Date.now();
  const liveInstances = (state?.instances ?? []).filter((i) => isRenderableInstance(i, nowMs));
  const desired = new Set<string>(liveInstances.map((i) => i.id));
  for (const [id, node] of nodes.entries()) {
    if (desired.has(id)) continue;
    const fx = (node as any).__fx;
    fx?.video?.pause?.();
    if (fx?.video) {
      fx.video.src = '';
    }
    root.removeChild(node);
    node.destroy?.({ children: true });
    nodes.delete(id);
  }
  if (!state) return;
  for (const inst of liveInstances) {
    const sig = instanceSig(inst, viewport);
    const existing = nodes.get(inst.id);
    if (existing && (existing as any).__sig === sig) continue;
    // Water draft: перерисовываем Graphics in-place (без destroy/create на каждую точку).
    if (
      existing &&
      inst.id === '__draft__' &&
      inst.type === 'water' &&
      (existing as any).__fx?.kind === 'waterDraft'
    ) {
      const halfW = Math.max(1.5, inst.radiusN * Math.min(viewport.w, viewport.h));
      redrawWaterDraft((existing as any).__fx.g, inst, viewport, halfW);
      existing.alpha = Math.max(0.35, Math.min(0.95, inst.opacity * 1.1));
      (existing as any).__sig = sig;
      continue;
    }
    if (existing) {
      const fx = (existing as any).__fx;
      fx?.video?.pause?.();
      if (fx?.video) {
        fx.video.src = '';
      }
      root.removeChild(existing);
      existing.destroy?.({ children: true });
      nodes.delete(inst.id);
    }
    const node = createInstanceNode(pixi, inst, size, viewport);
    if (!node) continue;
    (node as any).__sig = sig;
    nodes.set(inst.id, node);
    root.addChild(node);
  }
}

function isRenderableInstance(inst: EffectInstance, nowMs: number): boolean {
  if (!('lifetimeMs' in inst) || inst.lifetimeMs === null) return true;
  return nowMs - inst.createdAtMs < inst.lifetimeMs;
}

function createInstanceNode(
  pixi: any,
  inst: EffectInstance,
  _size: { w: number; h: number },
  viewport: { x: number; y: number; w: number; h: number },
): any | null {
  const { x: vx, y: vy, w, h } = viewport;
  if (inst.type === 'fog') {
    const base = inst.opacity;
    const minDim = Math.min(w, h);
    const r = inst.radiusN * minDim;
    const textures = getFogVfxFrameTextures(pixi);
    const c = new pixi.Container();
    for (let i = 0; i < inst.points.length; i += 1) {
      const p = inst.points[i];
      if (!p) continue;
      const s = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
      s.anchor?.set?.(0.5, 0.5);
      s.x = vx + p.x * w;
      s.y = vy + p.y * h;
      const fogSize = Math.max(4, r * 2);
      s.width = fogSize;
      s.height = fogSize;
      s.alpha = base;
      s.tint = 0xd8d8d8;
      s.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
      (s as any).__fx = {
        phase: hash01(inst.seed, i),
        w0: s.width,
        h0: s.height,
      };
      c.addChild(s);
    }
    (c as any).__fx = { id: inst.id, type: inst.type, textures };
    c.alpha = 1;
    void preloadFogVfxFrameTextures(pixi).then((loadedTextures) => {
      const fx = (c as any).__fx;
      if (fx?.type !== 'fog') return;
      fx.textures = loadedTextures;
      for (const child of c.children ?? []) {
        if (loadedTextures[0] && child.texture === pixi.Texture.EMPTY) {
          child.texture = loadedTextures[0];
        }
      }
    });
    return c;
  }
  if (inst.type === 'fire') {
    const base = 1;
    const minDim = Math.min(w, h);
    const r = inst.radiusN * minDim;
    const textures = getGroundFireVfxFrameTextures(pixi);
    const c = new pixi.Container();
    for (let i = 0; i < inst.points.length; i += 1) {
      const p = inst.points[i];
      if (!p) continue;
      const s = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
      s.anchor?.set?.(0.5, 0.62);
      s.x = vx + p.x * w;
      s.y = vy + p.y * h;
      const flameWidth = Math.max(r * 3.2, minDim * 0.05);
      s.width = flameWidth;
      s.height = flameWidth / GROUND_FIRE_VFX_FRAME_ASPECT;
      s.rotation = (hash01(inst.seed ^ 0x2f171717, i) - 0.5) * 0.18;
      s.alpha = base;
      s.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
      (s as any).__fx = {
        bx: s.x,
        by: s.y,
        phase: hash01(inst.seed ^ 0x5317f00d, i),
        wobble: 1 + 4 * hash01(inst.seed ^ 0x17171717, i),
        w0: s.width,
        h0: s.height,
      };
      c.addChild(s);
    }
    (c as any).__fx = { id: inst.id, type: inst.type, textures };
    c.alpha = 1;
    void preloadGroundFireVfxFrameTextures(pixi).then((loadedTextures) => {
      const fx = (c as any).__fx;
      if (fx?.type !== 'fire') return;
      fx.textures = loadedTextures;
      for (const child of c.children ?? []) {
        if (loadedTextures[0] && child.texture === pixi.Texture.EMPTY) {
          child.texture = loadedTextures[0];
        }
      }
    });
    return c;
  }
  if (inst.type === 'rain') {
    const base = inst.opacity;
    const minDim = Math.min(w, h);
    const r = inst.radiusN * minDim;
    const textures = getRainVfxFrameTextures(pixi);
    const c = new pixi.Container();
    for (let i = 0; i < inst.points.length; i += 1) {
      const p = inst.points[i];
      if (!p) continue;
      const s = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
      s.anchor?.set?.(0.5, 0.5);
      s.x = vx + p.x * w;
      s.y = vy + p.y * h;
      const rainWidth = Math.max(r * 3.8, minDim * 0.08);
      s.width = rainWidth;
      s.height = rainWidth / RAIN_VFX_FRAME_ASPECT;
      s.rotation = (hash01(inst.seed ^ 0x2a1f6a11, i) - 0.5) * 0.12;
      s.alpha = base;
      s.tint = 0xffffff;
      s.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
      (s as any).__fx = {
        bx: s.x,
        by: s.y,
        phase: hash01(inst.seed ^ 0x55aa55aa, i),
        drift: 2 + 8 * hash01(inst.seed ^ 0x9e3779b9, i),
        alphaMul: 0.9 + 0.45 * hash01(inst.seed ^ 0x3040506, i),
        w0: s.width,
        h0: s.height,
      };
      c.addChild(s);
    }
    (c as any).__fx = { id: inst.id, type: inst.type, textures };
    c.alpha = 1;
    void preloadRainVfxFrameTextures(pixi).then((loadedTextures) => {
      const fx = (c as any).__fx;
      if (fx?.type !== 'rain') return;
      fx.textures = loadedTextures;
      for (const child of c.children ?? []) {
        if (loadedTextures[0] && child.texture === pixi.Texture.EMPTY) {
          child.texture = loadedTextures[0];
        }
      }
    });
    return c;
  }
  if (inst.type === 'water') {
    const c = new pixi.Container();
    const halfW = Math.max(1.5, inst.radiusN * Math.min(w, h));
    if (inst.id === '__draft__') {
      const g = new pixi.Graphics();
      c.addChild(g);
      redrawWaterDraft(g, inst, viewport, halfW);
      (c as any).__fx = { kind: 'waterDraft', g };
      c.alpha = Math.max(0.35, Math.min(0.95, inst.opacity * 1.1));
      c.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
      return c;
    }
    const built = buildWaterFillSprite(pixi, inst, viewport, halfW);
    if (!built) return null;
    c.addChild(built.sprite);
    c.addChild(built.mask);
    (c as any).__fx = {
      kind: 'waterVfx',
      sprite: built.sprite,
      textures: built.textures,
      phase: hash01(inst.seed ^ 0x5ea0001, 0),
    };
    c.alpha = Math.max(0, Math.min(1, inst.opacity));
    c.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
    void preloadWaterVfxFrameTextures(pixi).then((loadedTextures) => {
      const fx = (c as any).__fx;
      if (fx?.kind !== 'waterVfx') return;
      fx.textures = loadedTextures;
      if (loadedTextures[0] && built.sprite.texture === pixi.Texture.EMPTY) {
        built.sprite.texture = loadedTextures[0];
      }
    });
    return c;
  }
  if (inst.type === 'darkness') {
    const tex = getDarknessScreenTexture(pixi, inst.seed, viewport);
    const s = new pixi.Sprite(tex);
    s.anchor?.set?.(0, 0);
    s.x = viewport.x;
    s.y = viewport.y;
    s.width = viewport.w;
    s.height = viewport.h;
    s.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
    s.alpha = 0;
    (s as any).__fx = { id: inst.id, type: inst.type, seed: inst.seed, vw: viewport.w, vh: viewport.h };
    return s;
  }
  if (inst.type === 'lightning') {
    const cont = new pixi.Container();
    const textures = getLightningVfxFrameTextures(pixi);
    const sprite = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
    sprite.anchor?.set?.(0.5, 0.5);
    sprite.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
    const accentTextures = getElectricAccentFrameTextures(pixi);
    const accentSprite = new pixi.Sprite(accentTextures[0] ?? pixi.Texture.EMPTY);
    accentSprite.anchor?.set?.(0.5, 0.5);
    accentSprite.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
    accentSprite.alpha = 0;
    const g = new pixi.Graphics();
    g.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
    cont.addChild(sprite);
    cont.addChild(accentSprite);
    cont.addChild(g);
    (cont as any).__fx = {
      id: inst.id,
      type: inst.type,
      sprite,
      accentSprite,
      g,
      textures,
      accentTextures,
    };
    void preloadLightningVfxFrameTextures(pixi).then((loadedTextures) => {
      const fx = (cont as any).__fx;
      if (fx?.type !== 'lightning') return;
      fx.textures = loadedTextures;
      if (loadedTextures[0] && sprite.texture === pixi.Texture.EMPTY) {
        sprite.texture = loadedTextures[0];
      }
    });
    void preloadElectricAccentFrameTextures(pixi).then((loadedTextures) => {
      const fx = (cont as any).__fx;
      if (fx?.type !== 'lightning') return;
      fx.accentTextures = loadedTextures;
      if (loadedTextures[0] && accentSprite.texture === pixi.Texture.EMPTY) {
        accentSprite.texture = loadedTextures[0];
      }
    });
    redrawLightningVfx(cont, inst, viewport, 0, Math.max(1, inst.lifetimeMs));
    return cont;
  }
  if (inst.type === 'sunbeam') {
    const cont = new pixi.Container();
    const textures = getPulseDischargeFrameTextures(pixi);
    const sprite = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
    sprite.anchor?.set?.(PULSE_DISCHARGE_IMPACT_ANCHOR_X, PULSE_DISCHARGE_IMPACT_ANCHOR_Y);
    sprite.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
    const g = new pixi.Graphics();
    g.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
    cont.addChild(sprite);
    cont.addChild(g);
    (cont as any).__fx = {
      id: inst.id,
      type: inst.type,
      sprite,
      g,
      textures,
    };
    void preloadPulseDischargeFrameTextures(pixi).then((loadedTextures) => {
      const fx = (cont as any).__fx;
      if (fx?.type !== 'sunbeam') return;
      fx.textures = loadedTextures;
      if (loadedTextures[0] && sprite.texture === pixi.Texture.EMPTY) {
        sprite.texture = loadedTextures[0];
      }
    });
    redrawPulseDischargeVfx(cont, inst, viewport, 0, Math.max(1, inst.lifetimeMs));
    return cont;
  }
  if (inst.type === 'poisonCloud') {
    const cont = new pixi.Container();
    const textures = getDustBurstFrameTextures(pixi);
    const sprite = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
    sprite.anchor?.set?.(0.5, 1);
    sprite.blendMode = pixi.BLEND_MODES?.ADD ?? 1;
    sprite.tint = 0x66ff99;
    const TextApi = (pixi as { Text?: new (opts: object) => any }).Text;
    let skull: any = null;
    if (typeof TextApi === 'function') {
      skull = new TextApi({
        text: '☠',
        style: {
          fontFamily: 'Arial, "Segoe UI Emoji", sans-serif',
          fontSize: 40,
          fill: 0x66ff99,
          align: 'center',
        },
      });
      skull.anchor?.set?.(0.5, 1);
      skull.visible = false;
    }
    cont.addChild(sprite);
    if (skull) cont.addChild(skull);
    (cont as any).__fx = { id: inst.id, type: inst.type, sprite, skull, textures };
    void preloadDustBurstFrameTextures(pixi).then((loadedTextures) => {
      const fx = (cont as any).__fx;
      if (fx?.type !== 'poisonCloud') return;
      fx.textures = loadedTextures;
      if (loadedTextures[0] && sprite.texture === pixi.Texture.EMPTY) {
        sprite.texture = loadedTextures[0];
      }
    });
    redrawPoisonCloud(cont, inst, viewport, 0, Math.max(1, inst.lifetimeMs));
    return cont;
  }
  if (inst.type === 'freeze') {
    const tex = getFreezeScreenTexture(pixi, inst.seed, viewport);
    const s = new pixi.Sprite(tex);
    s.anchor?.set?.(0, 0);
    s.x = viewport.x;
    s.y = viewport.y;
    s.width = viewport.w;
    s.height = viewport.h;
    s.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
    s.alpha = 0;
    (s as any).__fx = { id: inst.id, type: inst.type, seed: inst.seed, vw: viewport.w, vh: viewport.h };
    return s;
  }
  if (inst.type === 'scorch') {
    const tex = getScorchTexture(pixi);
    const s = new pixi.Sprite(tex);
    s.anchor?.set?.(0.5, 0.5);
    s.x = vx + inst.at.x * w;
    s.y = vy + inst.at.y * h;
    const r = inst.radiusN * Math.min(w, h);
    const scale = r / Math.max(1, tex.width * 0.5);
    s.scale?.set?.(scale, scale);
    s.rotation = hash01(inst.seed ^ 0xfeed, 0) * Math.PI * 2;
    s.alpha = Math.max(0, Math.min(1, inst.opacity));
    s.tint = 0x000000;
    s.blendMode = pixi.BLEND_MODES?.MULTIPLY ?? 3;
    (s as any).__fx = { id: inst.id, type: inst.type };
    return s;
  }
  if (inst.type === 'ice') {
    const tex = getIceTexture(pixi);
    const s = new pixi.Sprite(tex);
    s.anchor?.set?.(0.5, 0.5);
    s.x = vx + inst.at.x * w;
    s.y = vy + inst.at.y * h;
    const r = inst.radiusN * Math.min(w, h);
    const scale = r / Math.max(1, tex.width * 0.5);
    s.scale?.set?.(scale, scale);
    s.rotation = hash01(inst.seed ^ 0x1ced, 0) * Math.PI * 2;
    s.alpha = Math.max(0, Math.min(1, inst.opacity));
    // Цвет задаём в текстуре: белый прозрачный лёд + белые трещины.
    s.tint = 0xffffff;
    s.blendMode = pixi.BLEND_MODES?.SCREEN ?? 2;
    (s as any).__fx = { id: inst.id, type: inst.type };
    return s;
  }
  if (inst.type === 'shadow') {
    const tex = getShadowTexture(pixi);
    const s = new pixi.Sprite(tex);
    s.anchor?.set?.(0.5, 0.5);
    s.x = vx + inst.at.x * w;
    s.y = vy + inst.at.y * h;
    const r = inst.radiusN * Math.min(w, h);
    const scale = r / Math.max(1, tex.width * 0.5);
    s.scale?.set?.(scale, scale);
    s.alpha = Math.max(0, Math.min(1, inst.opacity));
    s.tint = 0xffffff;
    s.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
    (s as any).__fx = { id: inst.id, type: inst.type };
    return s;
  }
  return null;
}

function animateNodes(
  pixi: any,
  nodes: Map<string, any>,
  state: EffectsState,
  nowMs: number,
  size: { w: number; h: number },
  viewport: { x: number; y: number; w: number; h: number },
) {
  const instById = new Map(state.instances.map((i) => [i.id, i]));
  void pixi;
  void size;

  for (const [id, node] of nodes.entries()) {
    const inst = instById.get(id);
    if (!inst) continue;
    const t = Math.max(0, nowMs - inst.createdAtMs);

    if (inst.type === 'fog') {
      const cont = node;
      const fxRoot = (cont as any).__fx;
      const textures = Array.isArray(fxRoot?.textures) ? fxRoot.textures : [];
      const pulse = 0.92 + 0.08 * Math.sin(0.0012 * t + hash01(inst.seed, 0) * 6.28);
      cont.alpha = 1;
      for (const child of cont.children ?? []) {
        const fx = (child as any).__fx;
        if (!fx) continue;
        if (textures.length > 0) {
          const frameT = (t + (fx.phase ?? 0) * FOG_VFX_LOOP_MS) % FOG_VFX_LOOP_MS;
          const frameIndex = Math.min(
            textures.length - 1,
            Math.floor((frameT / FOG_VFX_LOOP_MS) * textures.length),
          );
          const frame = textures[frameIndex];
          if (frame && child.texture !== frame) {
            child.texture = frame;
          }
        }
        child.alpha = Math.max(0.05, Math.min(0.9, inst.opacity * pulse));
        child.width = typeof fx.w0 === 'number' ? fx.w0 : child.width;
        child.height = typeof fx.h0 === 'number' ? fx.h0 : child.height;
      }
    }

    if (inst.type === 'fire') {
      const cont = node;
      const fxRoot = (cont as any).__fx;
      const textures = Array.isArray(fxRoot?.textures) ? fxRoot.textures : [];
      cont.alpha = 1;
      for (const child of cont.children ?? []) {
        const fx = (child as any).__fx;
        if (!fx) continue;
        if (textures.length > 0) {
          const frameT = (t + (fx.phase ?? 0) * GROUND_FIRE_VFX_LOOP_MS) % GROUND_FIRE_VFX_LOOP_MS;
          const frameIndex = Math.min(
            textures.length - 1,
            Math.floor((frameT / GROUND_FIRE_VFX_LOOP_MS) * textures.length),
          );
          const frame = textures[frameIndex];
          if (frame && child.texture !== frame) {
            child.texture = frame;
          }
        }
        const wobble = typeof fx.wobble === 'number' ? fx.wobble : 2;
        child.x = fx.bx + Math.sin(0.0016 * t + (fx.phase ?? 0) * 6.28) * wobble;
        child.y = fx.by + Math.cos(0.0019 * t + (fx.phase ?? 0) * 6.28) * wobble * 0.45;
        const local = 0.93 + 0.07 * Math.sin(0.0042 * t + (fx.phase ?? 0) * 12.56);
        child.width = (typeof fx.w0 === 'number' ? fx.w0 : child.width) * local;
        child.height = (typeof fx.h0 === 'number' ? fx.h0 : child.height) * (0.96 + (local - 0.93) * 0.7);
        child.alpha = 1;
      }
    }

    if (inst.type === 'water') {
      const cont = node;
      const pulse = 0.94 + 0.06 * Math.sin(0.0011 * t + hash01(inst.seed ^ 0xc001d00d, 0) * 6.28);
      cont.alpha = Math.max(0, Math.min(1, inst.opacity * pulse));
      const fxRoot = (cont as any).__fx;
      const sprite = fxRoot?.sprite;
      const textures = Array.isArray(fxRoot?.textures) ? fxRoot.textures : [];
      if (sprite && textures.length > 0) {
        const frameT = (t + (fxRoot.phase ?? 0) * WATER_VFX_LOOP_MS) % WATER_VFX_LOOP_MS;
        const frameIndex = Math.min(
          textures.length - 1,
          Math.floor((frameT / WATER_VFX_LOOP_MS) * textures.length),
        );
        const frame = textures[frameIndex];
        if (frame && sprite.texture !== frame) {
          sprite.texture = frame;
        }
      }
    }

    if (inst.type === 'rain') {
      const cont = node;
      const fxRoot = (cont as any).__fx;
      const textures = Array.isArray(fxRoot?.textures) ? fxRoot.textures : [];
      const base = 0.94 + 0.06 * Math.sin(0.0018 * t + hash01(inst.seed ^ 0xdeadbeef, 0) * 6.28);
      cont.alpha = 1;
      for (const child of cont.children ?? []) {
        const fx = (child as any).__fx;
        if (!fx) continue;
        if (textures.length > 0) {
          const frameT = (t + (fx.phase ?? 0) * RAIN_VFX_LOOP_MS) % RAIN_VFX_LOOP_MS;
          const frameIndex = Math.min(
            textures.length - 1,
            Math.floor((frameT / RAIN_VFX_LOOP_MS) * textures.length),
          );
          const frame = textures[frameIndex];
          if (frame && child.texture !== frame) {
            child.texture = frame;
          }
        }
        const alphaMul = typeof fx.alphaMul === 'number' ? fx.alphaMul : 1;
        const wob = typeof fx.drift === 'number' ? fx.drift : 0;
        child.x = fx.bx + Math.sin(0.0011 * t + (fx.phase ?? 0) * 6.28) * wob;
        child.y = fx.by + Math.cos(0.0014 * t + (fx.phase ?? 0) * 6.28) * wob * 0.35;
        child.width = typeof fx.w0 === 'number' ? fx.w0 : child.width;
        child.height = typeof fx.h0 === 'number' ? fx.h0 : child.height;
        child.alpha = Math.max(0.25, Math.min(1, inst.opacity * base * alphaMul));
      }
    }

    if (inst.type === 'lightning') {
      const cont = node;
      const life = Math.max(1, inst.lifetimeMs);
      if (t >= life) {
        cont.visible = false;
        continue;
      }
      cont.visible = true;
      redrawLightningVfx(cont, inst, viewport, t, life);
    }

    if (inst.type === 'sunbeam') {
      const cont = node;
      const life = Math.max(1, inst.lifetimeMs);
      if (t >= life) {
        cont.visible = false;
        continue;
      }
      cont.visible = true;
      redrawPulseDischargeVfx(cont, inst, viewport, t, life);
    }

    if (inst.type === 'poisonCloud') {
      const cont = node;
      const life = Math.max(1, inst.lifetimeMs);
      if (t >= life) {
        cont.visible = false;
        continue;
      }
      cont.visible = true;
      redrawPoisonCloud(cont, inst, viewport, t, life);
    }

    if (inst.type === 'freeze') {
      const s = node;
      const life = Math.max(1, inst.lifetimeMs);
      if (t >= life) {
        s.visible = false;
        continue;
      }
      s.visible = true;
      const fx = (s as any).__fx ?? {};
      if (fx.vw !== viewport.w || fx.vh !== viewport.h) {
        s.texture = getFreezeScreenTexture(pixi, inst.seed, viewport);
        fx.vw = viewport.w;
        fx.vh = viewport.h;
        (s as any).__fx = fx;
      }
      s.x = viewport.x;
      s.y = viewport.y;
      s.width = viewport.w;
      s.height = viewport.h;
      s.alpha = freezeAlpha(t, life) * Math.max(0, Math.min(1.2, inst.intensity));
    }

    if (inst.type === 'darkness') {
      const s = node;
      const life = Math.max(1, inst.lifetimeMs);
      if (t >= life) {
        s.visible = false;
        continue;
      }
      s.visible = true;
      const fx = (s as any).__fx ?? {};
      if (fx.vw !== viewport.w || fx.vh !== viewport.h) {
        s.texture = getDarknessScreenTexture(pixi, inst.seed, viewport);
        fx.vw = viewport.w;
        fx.vh = viewport.h;
        (s as any).__fx = fx;
      }
      s.x = viewport.x;
      s.y = viewport.y;
      s.width = viewport.w;
      s.height = viewport.h;
      s.alpha = freezeAlpha(t, life) * Math.max(0, Math.min(1.2, inst.intensity));
    }

    if (inst.type === 'scorch') {
      const s = node;
      const life = Math.max(1, inst.lifetimeMs);
      const fade = 1 - t / life;
      s.visible = fade > 0;
      s.alpha = Math.max(0, Math.min(1, inst.opacity * fade));
    }

    if (inst.type === 'ice') {
      const s = node;
      // Пятно льда: сразу на полную яркость и остаётся на сцене (не синхронизируем с длительностью «замершего экрана»).
      s.visible = true;
      s.alpha = Math.max(0, Math.min(1, inst.opacity));
    }
  }
}

function hashWaterStroke(inst: { points: { x: number; y: number }[] }): number {
  let h = 2166136261 >>> 0;
  for (const p of inst.points) {
    if (!p) continue;
    h ^= Math.round(p.x * 10000);
    h = Math.imul(h, 16777619);
    h ^= Math.round(p.y * 10000);
    h = Math.imul(h, 16777619);
  }
  return h >>> 0;
}

function redrawWaterDraft(
  g: any,
  inst: Extract<EffectInstance, { type: 'water' }>,
  viewport: { x: number; y: number; w: number; h: number },
  halfW: number,
) {
  const { x: vx, y: vy, w, h } = viewport;
  g.clear();
  const pts = inst.points;
  if (pts.length === 0) return;
  const px = pts.map((p) => ({ x: vx + p.x * w, y: vy + p.y * h }));
  // Толщина как у итоговой заливки: диаметр = 2 × радиус кисти (см. buildWaterFillSprite).
  const lineW = Math.max(2, halfW * 2);
  if (px.length === 1) {
    const p0 = px[0];
    if (!p0) return;
    g.circle(p0.x, p0.y, Math.max(2, halfW));
    g.fill({ color: 0x5fc3ff, alpha: 0.42 });
    return;
  }
  const pStart = px[0];
  if (!pStart) return;
  g.moveTo(pStart.x, pStart.y);
  for (let i = 1; i < px.length; i += 1) {
    const pi = px[i];
    if (!pi) continue;
    g.lineTo(pi.x, pi.y);
  }
  g.stroke({ width: lineW, color: 0x5fc3ff, alpha: 0.48, cap: 'round', join: 'round' });
}

function buildWaterFillSprite(
  pixi: any,
  inst: Extract<EffectInstance, { type: 'water' }>,
  viewport: { x: number; y: number; w: number; h: number },
  halfW: number,
): { sprite: any; mask: any; textures: any[] } | null {
  const pts = inst.points;
  if (pts.length === 0) return null;
  const { x: vx, y: vy, w, h } = viewport;
  const pxPts = pts.map((p) => ({ x: vx + p.x * w, y: vy + p.y * h }));
  const firstPt = pxPts[0];
  if (!firstPt) return null;
  let minX = firstPt.x;
  let maxX = firstPt.x;
  let minY = firstPt.y;
  let maxY = firstPt.y;
  for (const p of pxPts) {
    minX = Math.min(minX, p.x);
    maxX = Math.max(maxX, p.x);
    minY = Math.min(minY, p.y);
    maxY = Math.max(maxY, p.y);
  }
  const pad = halfW * 2 + 8;
  const cw = Math.max(1, Math.ceil(maxX - minX + pad));
  const ch = Math.max(1, Math.ceil(maxY - minY + pad));
  const canvas = document.createElement('canvas');
  canvas.width = cw;
  canvas.height = ch;
  const ctx = canvas.getContext('2d');
  if (!ctx) return null;
  const ox = -minX + pad / 2;
  const oy = -minY + pad / 2;
  ctx.lineCap = 'round';
  ctx.lineJoin = 'round';
  ctx.strokeStyle = 'rgba(255, 255, 255, 1)';
  ctx.fillStyle = 'rgba(255, 255, 255, 1)';
  ctx.lineWidth = halfW * 2;

  if (pxPts.length === 1) {
    ctx.beginPath();
    ctx.arc(firstPt.x + ox, firstPt.y + oy, halfW, 0, Math.PI * 2);
    ctx.fill();
  } else {
    ctx.beginPath();
    ctx.moveTo(firstPt.x + ox, firstPt.y + oy);
    for (let i = 1; i < pxPts.length; i += 1) {
      const pi = pxPts[i];
      if (!pi) continue;
      ctx.lineTo(pi.x + ox, pi.y + oy);
    }
    ctx.stroke();
  }

  const maskTexture = pixi.Texture.from(canvas);
  const mask = new pixi.Sprite(maskTexture);
  mask.x = minX - pad / 2;
  mask.y = minY - pad / 2;
  mask.width = cw;
  mask.height = ch;
  mask.renderable = false;

  const textures = getWaterVfxFrameTextures(pixi);
  const sprite = new pixi.Sprite(textures[0] ?? pixi.Texture.EMPTY);
  sprite.x = minX - pad / 2;
  sprite.y = minY - pad / 2;
  sprite.width = cw;
  sprite.height = ch;
  sprite.blendMode = pixi.BLEND_MODES?.NORMAL ?? 0;
  sprite.mask = mask;
  return { sprite, mask, textures };
}

function redrawPoisonCloud(
  cont: any,
  inst: Extract<EffectInstance, { type: 'poisonCloud' }>,
  viewport: { x: number; y: number; w: number; h: number },
  t: number,
  life: number,
) {
  const fx = (cont as any).__fx;
  const sprite = fx?.sprite;
  const skull = fx?.skull;
  const textures = Array.isArray(fx?.textures) ? fx.textures : [];
  if (!sprite) return;

  const { x: vx, y: vy, w, h } = viewport;
  const minDim = Math.min(w, h);
  const cx = vx + inst.at.x * w;
  const cy = vy + inst.at.y * h;
  const R = Math.max(18, inst.radiusN * minDim * 1.35);
  const p = Math.max(0, Math.min(1, t / Math.min(life, DUST_BURST_VFX_DURATION_MS)));
  const fadeIn = Math.min(1, p / 0.08);
  const fadeOut = Math.min(1, (1 - p) / 0.18);
  const alpha = Math.max(0, Math.min(1, fadeIn * fadeOut * inst.intensity));

  const frame = textures[Math.min(textures.length - 1, Math.floor(p * textures.length))];
  if (frame && sprite.texture !== frame) {
    sprite.texture = frame;
  }

  const width = Math.max(R * 5.2, minDim * 0.18);
  sprite.x = cx;
  sprite.y = cy;
  sprite.width = width;
  sprite.height = width / DUST_BURST_VFX_FRAME_ASPECT;
  sprite.alpha = alpha;

  if (skull) {
    const show = p > 0.18 && p < 0.92;
    skull.visible = show;
    skull.alpha = show ? Math.max(0, Math.min(1, alpha * 0.95)) : 0;
    skull.x = cx;
    skull.y = cy - R * 0.72;
    const fs = Math.max(18, Math.min(92, R * 0.92));
    if (skull.style && typeof skull.style === 'object' && 'fontSize' in skull.style) {
      (skull.style as { fontSize: number }).fontSize = fs;
    }
  }
}

function redrawPulseDischargeVfx(
  cont: any,
  inst: Extract<EffectInstance, { type: 'sunbeam' }>,
  viewport: { x: number; y: number; w: number; h: number },
  t: number,
  life: number,
) {
  const fx = (cont as any).__fx;
  const sprite = fx?.sprite;
  const g = fx?.g;
  const textures = Array.isArray(fx?.textures) ? fx.textures : [];
  if (!sprite || !g) return;

  const { x: vx, y: vy, w, h } = viewport;
  const minDim = Math.min(w, h);
  const sx = vx + inst.start.x * w;
  const sy = vy + inst.start.y * h;
  const ex = vx + inst.end.x * w;
  const ey = vy + inst.end.y * h;
  const dx = ex - sx;
  const dy = ey - sy;
  const len = Math.max(1, Math.hypot(dx, dy));
  const p = Math.max(0, Math.min(1, t / Math.min(life, PULSE_DISCHARGE_VFX_DURATION_MS)));
  const fadeIn = Math.min(1, p / 0.08);
  const fadeOut = Math.min(1, (1 - p) / 0.16);
  const alpha = Math.max(0, Math.min(1, fadeIn * fadeOut * inst.intensity));

  const frame = textures[Math.min(textures.length - 1, Math.floor(p * textures.length))];
  if (frame && sprite.texture !== frame) {
    sprite.texture = frame;
  }

  sprite.x = ex;
  sprite.y = ey;
  sprite.rotation = Math.atan2(dy, dx);
  sprite.width = Math.max(len * 1.04, minDim * 0.28);
  sprite.height = Math.max(inst.widthN * minDim * 20, sprite.width / PULSE_DISCHARGE_VFX_FRAME_ASPECT);
  sprite.alpha = alpha;

  g.clear();
}

function lightningTrailVfxFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/lightning-trail-01/frame_${String(frameIndex).padStart(2, '0')}.webp`,
    window.location.href,
  ).href;
}

function electricAccentFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/electric-accent-10/frame_${String(frameIndex).padStart(2, '0')}.webp`,
    window.location.href,
  ).href;
}

function fogVfxFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/smokey-atmosphere-1-round/frame_${String(frameIndex).padStart(3, '0')}.webp`,
    window.location.href,
  ).href;
}

function groundFireVfxFrameUrl(frameIndex: number): string {
  return new URL(`vfx/small-fire/frame_${String(frameIndex).padStart(3, '0')}.webp`, window.location.href)
    .href;
}

function rainVfxFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/real-medium-rain-1/frame_${String(frameIndex).padStart(3, '0')}.webp`,
    window.location.href,
  ).href;
}

function waterVfxFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/generated-water/frame_${String(frameIndex).padStart(3, '0')}.webp`,
    window.location.href,
  ).href;
}

function pulseDischargeFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/pulse-discharge/frame_${String(frameIndex).padStart(3, '0')}.webp`,
    window.location.href,
  ).href;
}

function dustBurstFrameUrl(frameIndex: number): string {
  return new URL(
    `vfx/dust-burst-large-2/frame_${String(frameIndex).padStart(3, '0')}.webp`,
    window.location.href,
  ).href;
}

function getLightningVfxFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = lightningVfxFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    lightningVfxFrameTextureCache.set(pixi, { textures });
  }
  void preloadLightningVfxFrameTextures(pixi);
  return textures;
}

function getElectricAccentFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = electricAccentFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    electricAccentFrameTextureCache.set(pixi, { textures });
  }
  void preloadElectricAccentFrameTextures(pixi);
  return textures;
}

function getFogVfxFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = fogVfxFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    fogVfxFrameTextureCache.set(pixi, { textures });
  }
  void preloadFogVfxFrameTextures(pixi);
  return textures;
}

function getGroundFireVfxFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = groundFireVfxFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    groundFireVfxFrameTextureCache.set(pixi, { textures });
  }
  void preloadGroundFireVfxFrameTextures(pixi);
  return textures;
}

function getRainVfxFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = rainVfxFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    rainVfxFrameTextureCache.set(pixi, { textures });
  }
  void preloadRainVfxFrameTextures(pixi);
  return textures;
}

function getWaterVfxFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = waterVfxFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    waterVfxFrameTextureCache.set(pixi, { textures });
  }
  void preloadWaterVfxFrameTextures(pixi);
  return textures;
}

function getPulseDischargeFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = pulseDischargeFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    pulseDischargeFrameTextureCache.set(pixi, { textures });
  }
  void preloadPulseDischargeFrameTextures(pixi);
  return textures;
}

function getDustBurstFrameTextures(pixi: any): any[] {
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    const existing = dustBurstFrameTextureCache.get(pixi);
    if (existing) return existing.textures;
  }

  const textures: any[] = [];
  if (pixi !== null && (typeof pixi === 'object' || typeof pixi === 'function')) {
    dustBurstFrameTextureCache.set(pixi, { textures });
  }
  void preloadDustBurstFrameTextures(pixi);
  return textures;
}

function preloadLightningVfxFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = lightningVfxFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: LIGHTNING_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(lightningTrailVfxFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  lightningVfxFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadElectricAccentFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = electricAccentFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: ELECTRIC_ACCENT_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(electricAccentFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  electricAccentFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadFogVfxFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = fogVfxFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: FOG_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(fogVfxFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  fogVfxFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadGroundFireVfxFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = groundFireVfxFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: GROUND_FIRE_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(groundFireVfxFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  groundFireVfxFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadRainVfxFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = rainVfxFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: RAIN_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(rainVfxFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  rainVfxFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadWaterVfxFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = waterVfxFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: WATER_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(waterVfxFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  waterVfxFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadPulseDischargeFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = pulseDischargeFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: PULSE_DISCHARGE_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(pulseDischargeFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  pulseDischargeFrameTextureCache.set(pixi, record);
  return loading;
}

function preloadDustBurstFrameTextures(pixi: any): Promise<any[]> {
  if (pixi === null || (typeof pixi !== 'object' && typeof pixi !== 'function')) {
    return Promise.resolve([]);
  }

  const cached = dustBurstFrameTextureCache.get(pixi);
  if (cached?.textures.length) return Promise.resolve(cached.textures);
  if (cached?.loading) return cached.loading;

  const record = cached ?? { textures: [] };
  const loading = Promise.all(
    Array.from({ length: DUST_BURST_VFX_FRAME_COUNT }, async (_, i) => {
      const image = await loadImageElement(dustBurstFrameUrl(i + 1));
      return pixi.Texture.from(image) ?? pixi.Texture.EMPTY;
    }),
  )
    .then((textures) => {
      record.textures.splice(0, record.textures.length, ...textures);
      return record.textures;
    })
    .catch(() => record.textures);

  record.loading = loading;
  dustBurstFrameTextureCache.set(pixi, record);
  return loading;
}

async function loadImageElement(src: string): Promise<HTMLImageElement> {
  const image = new Image();
  image.decoding = 'async';
  image.src = src;
  if (!image.complete) {
    await new Promise<void>((resolve, reject) => {
      image.addEventListener('load', () => resolve(), { once: true });
      image.addEventListener('error', () => reject(new Error(`Failed to load image: ${src}`)), {
        once: true,
      });
    });
  }
  await image.decode?.().catch(() => undefined);
  return image;
}

function redrawLightningVfx(
  cont: any,
  inst: Extract<EffectInstance, { type: 'lightning' }>,
  viewport: { x: number; y: number; w: number; h: number },
  t: number,
  life: number,
) {
  const fx = (cont as any).__fx;
  const sprite = fx?.sprite;
  const accentSprite = fx?.accentSprite;
  const g = fx?.g;
  const textures = Array.isArray(fx?.textures) ? fx.textures : [];
  const accentTextures = Array.isArray(fx?.accentTextures) ? fx.accentTextures : [];
  if (!sprite || !g) return;

  const { x: vx, y: vy, w, h } = viewport;
  const minDim = Math.min(w, h);
  const ex = vx + inst.end.x * w;
  const ey = vy + inst.end.y * h;
  const strikeLife = Math.min(Math.max(1, life), LIGHTNING_VFX_STRIKE_MS);
  const p = Math.max(0, Math.min(1, t / strikeLife));
  const fadeIn = Math.min(1, p / 0.08);
  const fadeOut = Math.min(1, (1 - p) / 0.18);
  const alpha = Math.max(0, Math.min(1, fadeIn * fadeOut * inst.intensity));
  const hasFrameTextures = textures.length >= LIGHTNING_VFX_FRAME_COUNT;

  const frame = textures[Math.min(textures.length - 1, Math.floor(p * textures.length))];
  if (frame && sprite.texture !== frame) {
    sprite.texture = frame;
  }

  const strikeHeight = Math.max(minDim * 0.22, ey - vy);
  sprite.anchor?.set?.(0.5, LIGHTNING_VFX_IMPACT_ANCHOR_Y);
  sprite.x = ex;
  sprite.y = ey;
  sprite.rotation = 0;
  sprite.height = strikeHeight * 1.04;
  sprite.width = Math.max(inst.widthN * minDim * 18, strikeHeight * LIGHTNING_VFX_FRAME_ASPECT * 0.72);
  sprite.alpha = Math.min(1, alpha);

  if (accentSprite) {
    const accentEndMs = ELECTRIC_ACCENT_START_MS + ELECTRIC_ACCENT_DURATION_MS;
    const accentP = Math.max(0, Math.min(1, (t - ELECTRIC_ACCENT_START_MS) / ELECTRIC_ACCENT_DURATION_MS));
    const accentFrame =
      accentTextures[Math.min(accentTextures.length - 1, Math.floor(accentP * accentTextures.length))];
    if (accentFrame && accentSprite.texture !== accentFrame) {
      accentSprite.texture = accentFrame;
    }
    const accentFadeOut = Math.min(1, (accentEndMs - t) / 130);
    const accentAlpha =
      t >= ELECTRIC_ACCENT_START_MS &&
      t <= accentEndMs &&
      accentTextures.length >= ELECTRIC_ACCENT_FRAME_COUNT
        ? Math.max(0, Math.min(1, accentFadeOut * inst.intensity))
        : 0;
    const accentWidth = Math.max(minDim * 0.2, Math.min(minDim * 0.48, inst.widthN * minDim * 18));
    accentSprite.x = ex;
    accentSprite.y = ey;
    accentSprite.rotation = 0;
    accentSprite.width = accentWidth;
    accentSprite.height = accentWidth / ELECTRIC_ACCENT_FRAME_ASPECT;
    accentSprite.alpha = accentAlpha;
  }

  g.clear();
  if (!hasFrameTextures) {
    const boltAlpha = Math.max(0, Math.min(1, alpha * 1.15));
    const topY = Math.max(vy, ey - strikeHeight);
    const segments = 10;
    let px = ex;
    let py = topY;
    for (let i = 1; i <= segments; i += 1) {
      const u = i / segments;
      const nextY = topY + (ey - topY) * u;
      const wobble =
        (hash01(inst.seed ^ 0x91e10f, i) - 0.5) * inst.widthN * minDim * 7 * (1 - Math.abs(u - 0.5));
      const nextX = ex + wobble;
      g.moveTo(px, py);
      g.lineTo(nextX, nextY);
      g.stroke({ color: 0x7eeeff, width: Math.max(2, inst.widthN * minDim * 2.5), alpha: boltAlpha * 0.65 });
      g.stroke({ color: 0xffffff, width: Math.max(1, inst.widthN * minDim * 1.1), alpha: boltAlpha });
      px = nextX;
      py = nextY;
    }
  }
}

function instanceSig(inst: EffectInstance, viewport: { x: number; y: number; w: number; h: number }): string {
  if (inst.type === 'fog') {
    const last = inst.points[inst.points.length - 1];
    const lx = last ? Math.round(last.x * 1000) : 0;
    const ly = last ? Math.round(last.y * 1000) : 0;
    return `fog:${inst.points.length}:${lx}:${ly}:${Math.round(inst.radiusN * 1000)}`;
  }
  if (inst.type === 'fire') {
    const last = inst.points[inst.points.length - 1];
    const lx = last ? Math.round(last.x * 1000) : 0;
    const ly = last ? Math.round(last.y * 1000) : 0;
    return `fire:${inst.points.length}:${lx}:${ly}:${Math.round(inst.radiusN * 1000)}`;
  }
  if (inst.type === 'rain') {
    const last = inst.points[inst.points.length - 1];
    const lx = last ? Math.round(last.x * 1000) : 0;
    const ly = last ? Math.round(last.y * 1000) : 0;
    return `rain:${inst.points.length}:${lx}:${ly}:${Math.round(inst.radiusN * 1000)}`;
  }
  if (inst.type === 'water') {
    const hp = hashWaterStroke(inst);
    return `water:${inst.points.length}:${hp}:${Math.round(inst.radiusN * 1000)}:${Math.round(inst.opacity * 1000)}:${Math.round(viewport.w)}:${Math.round(viewport.h)}`;
  }
  if (inst.type === 'lightning') {
    return `lt:${Math.round(inst.end.x * 1000)}:${Math.round(inst.end.y * 1000)}:${Math.round(inst.widthN * 1000)}`;
  }
  if (inst.type === 'sunbeam') {
    return `sb:${Math.round(inst.end.x * 1000)}:${Math.round(inst.end.y * 1000)}:${Math.round(inst.widthN * 1000)}`;
  }
  if (inst.type === 'poisonCloud') {
    return `pc:${Math.round(inst.at.x * 1000)}:${Math.round(inst.at.y * 1000)}:${Math.round(inst.radiusN * 1000)}`;
  }
  if (inst.type === 'freeze') {
    return `fr:${Math.round(inst.at.x * 1000)}:${Math.round(inst.at.y * 1000)}:${Math.round(inst.intensity * 1000)}`;
  }
  if (inst.type === 'darkness') {
    return `dk:${Math.round(inst.at.x * 1000)}:${Math.round(inst.at.y * 1000)}:${Math.round(inst.intensity * 1000)}`;
  }
  if (inst.type === 'scorch') {
    return `sc:${Math.round(inst.at.x * 1000)}:${Math.round(inst.at.y * 1000)}:${Math.round(inst.radiusN * 1000)}`;
  }
  if (inst.type === 'ice') {
    return `ice:${Math.round(inst.at.x * 1000)}:${Math.round(inst.at.y * 1000)}:${Math.round(inst.radiusN * 1000)}`;
  }
  if (inst.type === 'shadow') {
    return `sh:${Math.round(inst.at.x * 1000)}:${Math.round(inst.at.y * 1000)}:${Math.round(inst.radiusN * 1000)}`;
  }
  // Exhaustive guard — на случай, если добавим новый тип инстанса и забудем сюда.
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  const _exhaustive: never = inst;
  return 'unknown';
}

function hash01(seed: number, n: number): number {
  // Дешёвый детерминированный шум 0..1 (без Math.random).
  let x = (seed ^ (n * 374761393)) >>> 0;
  x = (x ^ (x >>> 13)) >>> 0;
  x = (x * 1274126177) >>> 0;
  return ((x ^ (x >>> 16)) >>> 0) / 0xffffffff;
}

function computeSceneShake(
  state: EffectsState,
  nowMs: number,
  size: { w: number; h: number },
): { x: number; y: number } {
  // Ищем самую “активную” молнию в фазе вспышки и строим shake от неё.
  let best = 0;
  let bestSeed = 0;
  const { w, h } = size;
  for (const inst of state.instances) {
    if (inst.type !== 'lightning') continue;
    const t = Math.max(0, nowMs - inst.createdAtMs);
    const life = Math.max(1, inst.lifetimeMs);
    const flashMs = Math.min(420, Math.max(160, Math.floor(life * 0.42)));
    if (t > flashMs) continue;
    const flashT = Math.max(0, Math.min(1, 1 - t / flashMs));
    const k = flashT * Math.max(0, inst.intensity) * 1.4;
    if (k > best) {
      best = k;
      bestSeed = inst.seed;
    }
  }
  if (best <= 0.0001) return { x: 0, y: 0 };

  // Амплитуда небольшая: 0..~8px, зависит от размера экрана и интенсивности.
  const amp = Math.min(9, Math.max(2, 0.012 * Math.min(w, h))) * Math.min(1, best);
  const n = Math.floor(nowMs / 16); // примерно 60fps-ступенька, чтобы “дребезжало”
  const ox = (hash01(bestSeed ^ 0x13579bdf, n) - 0.5) * 2 * amp;
  const oy = (hash01(bestSeed ^ 0x2468ace, n) - 0.5) * 2 * amp;
  return { x: ox, y: oy };
}

let scorchTextureCache: { key: string; texture: any } | null = null;
let iceTextureCache: { key: string; texture: any } | null = null;
let shadowTextureCache: { key: string; texture: any } | null = null;
let freezeScreenTextureCache: Map<string, any> | null = null;
let darknessScreenTextureCache: Map<string, any> | null = null;

function getIceTexture(pixi: any): any {
  const key = 'ice_v3';
  if (iceTextureCache?.key === key) return iceTextureCache.texture;

  const size = 256;
  const canvas = document.createElement('canvas');
  canvas.width = size;
  canvas.height = size;
  const ctx = canvas.getContext('2d');
  if (!ctx) {
    const t = pixi.Texture.WHITE;
    iceTextureCache = { key, texture: t };
    return t;
  }

  ctx.clearRect(0, 0, size, size);

  // “Пятно” льда на земле: хаотичный кусок льда (не круг),
  // центр заполнен, сверху белые “трещины”/кромка инея.
  const cx = size / 2;
  const cy = size / 2;
  const radius = size * 0.48;
  const amp = Math.max(10, radius * 0.12);

  const img = ctx.createImageData(size, size);
  const data = img.data;
  const n2 = (x: number, y: number) => {
    const xi = x | 0;
    const yi = y | 0;
    const a = hash01(0x1ced ^ 0x9e3779b9, xi * 17 + yi * 131);
    const b = hash01(0x1ced ^ 0x7f4a7c15, xi * 53 + yi * 97);
    return a * 0.65 + b * 0.35;
  };

  for (let y = 0; y < size; y += 1) {
    for (let x = 0; x < size; x += 1) {
      const i = (y * size + x) * 4;
      const dx = x - cx;
      const dy = y - cy;
      const dist = Math.sqrt(dx * dx + dy * dy);

      // Неровная граница “куска льда”: радиус искажаем шумом.
      const nn = n2(x * 0.55, y * 0.55);
      const rr = radius + (nn - 0.5) * 2 * amp;
      if (dist > rr) {
        data[i + 3] = 0;
        continue;
      }

      // Центр обязательно заполнен: базовая заливка сильнее в центре, мягче к краю.
      const t = Math.max(0, Math.min(1, 1 - dist / Math.max(1, rr))); // 1 в центре, 0 на краю
      const fill = 0.35 + 0.65 * Math.pow(t, 0.7);

      // Лёгкая “молочность” и глубина (вариация прозрачности).
      const depth = 0.75 + 0.25 * n2(x * 0.12 + 13, y * 0.12 + 7);
      const a = Math.round(255 * fill * depth);

      // Белый прозрачный лёд: цвет почти белый, “структура” читается в альфе.
      const ice = 0.45 + 0.55 * n2(x * 0.22 + 3, y * 0.22 + 11);
      const edge = Math.pow(1 - t, 1.1);
      data[i] = Math.round(242 + 10 * ice - 6 * edge);
      data[i + 1] = Math.round(248 + 6 * ice - 5 * edge);
      data[i + 2] = Math.round(255 - 4 * edge);
      // Сделаем пятно менее прозрачным (но не “пустым”).
      data[i + 3] = Math.min(255, Math.round(a * 0.72));
    }
  }
  ctx.putImageData(img, 0, 0);

  // Белые трещины и “иней” сверху (чтобы не было ощущения идеально гладкого пятна).
  ctx.save();
  ctx.globalCompositeOperation = 'source-over';
  ctx.shadowColor = 'rgba(200,245,255,0.35)';
  ctx.shadowBlur = 4;
  ctx.lineCap = 'round';
  // Трещины (полилинии)
  for (let k = 0; k < 28; k += 1) {
    const ang = hash01(0x1ced ^ 0x91e10da, k) * Math.PI * 2;
    const r0 = radius * (0.05 + 0.22 * hash01(0x1ced ^ 0x1234567, k));
    const r1 = radius * (0.65 + 0.35 * hash01(0x1ced ^ 0x2345678, k));
    const sx = cx + Math.cos(ang) * r0;
    const sy = cy + Math.sin(ang) * r0;
    const ex = cx + Math.cos(ang + (hash01(0x1ced ^ 0x3456789, k) - 0.5) * 0.55) * r1;
    const ey = cy + Math.sin(ang + (hash01(0x1ced ^ 0x456789a, k) - 0.5) * 0.55) * r1;
    const midx = (sx + ex) / 2 + (hash01(0x1ced ^ 0x56789ab, k) - 0.5) * 18;
    const midy = (sy + ey) / 2 + (hash01(0x1ced ^ 0x6789abc, k) - 0.5) * 18;
    ctx.lineWidth = 1.2 + 1.8 * hash01(0x1ced ^ 0x789abcd, k);
    ctx.strokeStyle = `rgba(255,255,255,${String(0.22 + 0.35 * hash01(0x1ced ^ 0x89abcde, k))})`;
    ctx.beginPath();
    ctx.moveTo(sx, sy);
    ctx.lineTo(midx, midy);
    ctx.lineTo(ex, ey);
    ctx.stroke();
  }
  // Иней по границе (короткие штрихи внутрь)
  for (let k = 0; k < 140; k += 1) {
    const u = hash01(0x1ced ^ 0x51c0ffee, k);
    const ang = u * Math.PI * 2;
    const jitter = (hash01(0x1ced ^ 0x44aa77cc, k) - 0.5) * amp;
    const sx = cx + Math.cos(ang) * (radius + jitter);
    const sy = cy + Math.sin(ang) * (radius + jitter);
    const dx = -Math.cos(ang);
    const dy = -Math.sin(ang);
    const len = radius * (0.06 + 0.22 * hash01(0x1ced ^ 0xabcddcba, k));
    ctx.lineWidth = 0.6 + 1.1 * hash01(0x1ced ^ 0x12121212, k);
    ctx.strokeStyle = `rgba(255,255,255,${String(0.1 + 0.22 * hash01(0x1ced ^ 0x1c3d5e7, k))})`;
    ctx.beginPath();
    ctx.moveTo(sx, sy);
    ctx.lineTo(sx + dx * len, sy + dy * len);
    ctx.stroke();
  }
  ctx.restore();

  const tex = pixi.Texture.from(canvas);
  iceTextureCache = { key, texture: tex };
  return tex;
}

function getScorchTexture(pixi: any): any {
  const key = 'scorch_v1';
  if (scorchTextureCache?.key === key) return scorchTextureCache.texture;

  const size = 256;
  const canvas = document.createElement('canvas');
  canvas.width = size;
  canvas.height = size;
  const ctx = canvas.getContext('2d');
  if (!ctx) {
    const t = pixi.Texture.WHITE;
    scorchTextureCache = { key, texture: t };
    return t;
  }

  ctx.clearRect(0, 0, size, size);

  // “Рыхлый” ожог: более резкая форма + сильный шум по альфе.
  const g = ctx.createRadialGradient(size / 2, size / 2, size * 0.06, size / 2, size / 2, size / 2);
  g.addColorStop(0, 'rgba(255,255,255,0.98)');
  g.addColorStop(0.35, 'rgba(255,255,255,0.80)');
  g.addColorStop(0.7, 'rgba(255,255,255,0.25)');
  g.addColorStop(1, 'rgba(255,255,255,0.00)');
  ctx.fillStyle = g;
  ctx.beginPath();
  ctx.arc(size / 2, size / 2, size / 2, 0, Math.PI * 2);
  ctx.fill();

  const img = ctx.getImageData(0, 0, size, size);
  for (let i = 0; i < img.data.length; i += 4) {
    const a = img.data[i + 3] ?? 0;
    if (a === 0) continue;
    // Шум по альфе и чуть по яркости: делает край “рваным”.
    const n = (Math.random() - 0.5) * 90;
    const na = (Math.random() - 0.5) * 140;
    img.data[i] = clamp255((img.data[i] ?? 0) + n);
    img.data[i + 1] = clamp255((img.data[i + 1] ?? 0) + n);
    img.data[i + 2] = clamp255((img.data[i + 2] ?? 0) + n);
    img.data[i + 3] = clamp255(a + na);
  }
  ctx.putImageData(img, 0, 0);

  const tex = pixi.Texture.from(canvas);
  scorchTextureCache = { key, texture: tex };
  return tex;
}

const SHADOW_EDGE_ALPHA = 0.4;
const SHADOW_CENTER_ALPHA = Math.min(1, 0.85 * 1.4);

function getShadowTexture(pixi: any): any {
  const key = 'shadow_v3';
  if (shadowTextureCache?.key === key) return shadowTextureCache.texture;

  const size = 256;
  const canvas = document.createElement('canvas');
  canvas.width = size;
  canvas.height = size;
  const ctx = canvas.getContext('2d');
  if (!ctx) {
    const t = pixi.Texture.WHITE;
    shadowTextureCache = { key, texture: t };
    return t;
  }

  ctx.clearRect(0, 0, size, size);
  const cx = size / 2;
  const cy = size / 2;
  const r = size / 2 - 0.5;
  const grd = ctx.createRadialGradient(cx, cy, 0, cx, cy, r);
  grd.addColorStop(0, `rgba(0, 0, 0, ${String(SHADOW_CENTER_ALPHA)})`);
  grd.addColorStop(1, `rgba(0, 0, 0, ${String(SHADOW_EDGE_ALPHA)})`);
  ctx.fillStyle = grd;
  ctx.beginPath();
  ctx.arc(cx, cy, r, 0, Math.PI * 2);
  ctx.fill();

  const tex = pixi.Texture.from(canvas);
  shadowTextureCache = { key, texture: tex };
  return tex;
}

function smoothstep01(x: number): number {
  const t = Math.max(0, Math.min(1, x));
  return t * t * (3 - 2 * t);
}

function freezeAlpha(t: number, life: number): number {
  const L = Math.max(1, life);
  // Те же доли, что при life=820 (180 / 220 / остаток), масштабируются под длину звука.
  const inMs = Math.max(60, (L * 180) / 820);
  const holdMs = Math.max(40, (L * 220) / 820);
  const outMs = Math.max(80, L - inMs - holdMs);
  if (t <= inMs) return smoothstep01(t / inMs);
  if (t <= inMs + holdMs) return 1;
  return 1 - smoothstep01((t - inMs - holdMs) / outMs);
}

function getFreezeScreenTexture(
  pixi: any,
  seed: number,
  viewport: { x: number; y: number; w: number; h: number },
): any {
  const w = Math.max(1, Math.floor(viewport.w));
  const h = Math.max(1, Math.floor(viewport.h));
  const key = `freeze_v1:${String(w)}x${String(h)}:${String(seed >>> 0)}`;
  if (!freezeScreenTextureCache) freezeScreenTextureCache = new Map();
  const cached = freezeScreenTextureCache.get(key);
  if (cached) return cached;

  const canvas = document.createElement('canvas');
  canvas.width = w;
  canvas.height = h;
  const ctx = canvas.getContext('2d');
  if (!ctx) {
    const t = pixi.Texture.WHITE;
    freezeScreenTextureCache.set(key, t);
    return t;
  }

  ctx.clearRect(0, 0, w, h);

  const thickness = 0.35 * Math.min(w, h); // чистый центр ~30%
  const amp = Math.max(10, thickness * 0.14); // неровная внутренняя граница

  const img = ctx.createImageData(w, h);
  const data = img.data;

  const n2 = (x: number, y: number) => {
    const xi = x | 0;
    const yi = y | 0;
    const a = hash01(seed ^ 0x9e3779b9, xi * 17 + yi * 131);
    const b = hash01(seed ^ 0x7f4a7c15, xi * 53 + yi * 97);
    return a * 0.65 + b * 0.35;
  };

  for (let y = 0; y < h; y += 1) {
    for (let x = 0; x < w; x += 1) {
      const i = (y * w + x) * 4;
      const d = Math.min(x, y, w - 1 - x, h - 1 - y);
      const nn = n2(x * 0.55, y * 0.55);
      const dd = d + (nn - 0.5) * 2 * amp;
      const t = 1 - Math.max(0, Math.min(1, dd / thickness)); // 1 у края, 0 внутри
      if (t <= 0) {
        data[i + 3] = 0;
        continue;
      }

      const soft = Math.pow(t, 1.7);
      const depth = 0.65 + 0.35 * n2(x * 0.12 + 13, y * 0.12 + 7);
      const a = Math.round(255 * soft * depth);

      const ice = 0.55 + 0.45 * n2(x * 0.22 + 3, y * 0.22 + 11);
      const r = Math.round(210 + 40 * ice);
      const g = Math.round(232 + 20 * ice);
      const b = Math.round(245 + 10 * ice);

      data[i] = r;
      data[i + 1] = g;
      data[i + 2] = b;
      data[i + 3] = Math.min(255, a);
    }
  }
  ctx.putImageData(img, 0, 0);

  // Игольчатые кристаллы + лёгкий blur (глубина).
  ctx.save();
  ctx.globalCompositeOperation = 'source-over';
  for (let pass = 0; pass < 2; pass += 1) {
    ctx.shadowColor = 'rgba(180,240,255,0.35)';
    ctx.shadowBlur = pass === 0 ? 7 : 2;
    const count = pass === 0 ? 140 : 220;
    for (let k = 0; k < count; k += 1) {
      const u = hash01(seed ^ 0x51c0ffee, k);
      const side = Math.floor(hash01(seed ^ 0x1cedf00d, k) * 4);
      const baseLen = thickness * (0.18 + 0.55 * hash01(seed ^ 0xabcddcba, k));
      const branches = 2 + Math.floor(hash01(seed ^ 0x12121212, k) * 3);
      ctx.lineWidth = pass === 0 ? 1.4 : 0.9;
      ctx.strokeStyle = pass === 0 ? 'rgba(230,252,255,0.18)' : 'rgba(245,255,255,0.22)';
      ctx.lineCap = 'round';

      let sx = 0;
      let sy = 0;
      let dx = 0;
      let dy = 0;
      if (side === 0) {
        sx = u * w;
        sy = 0;
        dx = (hash01(seed ^ 0x33aa55, k) - 0.5) * 0.35;
        dy = 1;
      } else if (side === 2) {
        sx = u * w;
        sy = h;
        dx = (hash01(seed ^ 0x33aa55, k) - 0.5) * 0.35;
        dy = -1;
      } else if (side === 3) {
        sx = 0;
        sy = u * h;
        dx = 1;
        dy = (hash01(seed ^ 0x55aa33, k) - 0.5) * 0.35;
      } else {
        sx = w;
        sy = u * h;
        dx = -1;
        dy = (hash01(seed ^ 0x55aa33, k) - 0.5) * 0.35;
      }

      const ex = sx + dx * baseLen;
      const ey = sy + dy * baseLen;
      ctx.beginPath();
      ctx.moveTo(sx, sy);
      ctx.lineTo(ex, ey);
      ctx.stroke();

      for (let b = 0; b < branches; b += 1) {
        const tt = 0.25 + 0.6 * hash01(seed ^ 0x778899, k * 7 + b);
        const bx = sx + (ex - sx) * tt;
        const by = sy + (ey - sy) * tt;
        const ang = (hash01(seed ^ 0x998877, k * 11 + b) - 0.5) * 1.25;
        const bl = baseLen * (0.15 + 0.35 * hash01(seed ^ 0x445566, k * 13 + b));
        const ndx = dx * Math.cos(ang) - dy * Math.sin(ang);
        const ndy = dx * Math.sin(ang) + dy * Math.cos(ang);
        ctx.beginPath();
        ctx.moveTo(bx, by);
        ctx.lineTo(bx + ndx * bl, by + ndy * bl);
        ctx.stroke();
      }
    }
  }
  ctx.restore();

  const tex = pixi.Texture.from(canvas);
  freezeScreenTextureCache.set(key, tex);
  if (freezeScreenTextureCache.size > 18) {
    const first = freezeScreenTextureCache.keys().next().value as string | undefined;
    if (first) freezeScreenTextureCache.delete(first);
  }
  return tex;
}

function getDarknessScreenTexture(
  pixi: any,
  seed: number,
  viewport: { x: number; y: number; w: number; h: number },
): any {
  const w = Math.max(1, Math.floor(viewport.w));
  const h = Math.max(1, Math.floor(viewport.h));
  const key = `darkness_v1:${String(w)}x${String(h)}:${String(seed >>> 0)}`;
  if (!darknessScreenTextureCache) darknessScreenTextureCache = new Map();
  const cached = darknessScreenTextureCache.get(key);
  if (cached) return cached;

  const canvas = document.createElement('canvas');
  canvas.width = w;
  canvas.height = h;
  const ctx = canvas.getContext('2d');
  if (!ctx) {
    const t = pixi.Texture.WHITE;
    darknessScreenTextureCache.set(key, t);
    return t;
  }

  ctx.clearRect(0, 0, w, h);

  const thickness = 0.35 * Math.min(w, h);
  const amp = Math.max(10, thickness * 0.14);

  const img = ctx.createImageData(w, h);
  const data = img.data;

  const n2 = (x: number, y: number) => {
    const xi = x | 0;
    const yi = y | 0;
    const a = hash01(seed ^ 0x9e3779b9, xi * 17 + yi * 131);
    const b = hash01(seed ^ 0x7f4a7c15, xi * 53 + yi * 97);
    return a * 0.65 + b * 0.35;
  };

  for (let y = 0; y < h; y += 1) {
    for (let x = 0; x < w; x += 1) {
      const i = (y * w + x) * 4;
      const d = Math.min(x, y, w - 1 - x, h - 1 - y);
      const nn = n2(x * 0.55, y * 0.55);
      const dd = d + (nn - 0.5) * 2 * amp;
      const t = 1 - Math.max(0, Math.min(1, dd / thickness));
      if (t <= 0) {
        data[i + 3] = 0;
        continue;
      }

      const soft = Math.pow(t, 1.7);
      const depth = 0.65 + 0.35 * n2(x * 0.12 + 13, y * 0.12 + 7);
      const a = Math.round(255 * soft * depth);

      data[i] = 0;
      data[i + 1] = 0;
      data[i + 2] = 0;
      data[i + 3] = Math.min(255, a);
    }
  }
  ctx.putImageData(img, 0, 0);

  const tex = pixi.Texture.from(canvas);
  darknessScreenTextureCache.set(key, tex);
  if (darknessScreenTextureCache.size > 18) {
    const first = darknessScreenTextureCache.keys().next().value as string | undefined;
    if (first) darknessScreenTextureCache.delete(first);
  }
  return tex;
}

function clamp255(v: number): number {
  if (!Number.isFinite(v)) return 0;
  if (v < 0) return 0;
  if (v > 255) return 255;
  return Math.round(v);
}