import fs from 'node:fs';
import path from 'node:path';
import { pathToFileURL } from 'node:url';

import { app, BrowserWindow, nativeImage, screen } from 'electron';

type WindowKind = 'editor' | 'presentation' | 'control';

const windows = new Map<WindowKind, BrowserWindow>();

let appQuitting = false;

/** Разрешает реальное закрытие окна редактора (выход из приложения). */
export function markAppQuitting(): void {
  appQuitting = true;
}

function quitAppFromEditorClose(): void {
  markAppQuitting();
  app.quit();
}

function isDev() {
  return process.env.NODE_ENV === 'development' || process.env.VITE_DEV_SERVER_URL !== undefined;
}

function getRendererUrl(kind: WindowKind): string {
  const dev = process.env.VITE_DEV_SERVER_URL;
  if (dev) {
    const page =
      kind === 'editor' ? 'editor.html' : kind === 'presentation' ? 'presentation.html' : 'control.html';
    return new URL(page, dev).toString();
  }
  const filePath = path.join(app.getAppPath(), 'dist', 'renderer', `${kind}.html`);
  return pathToFileURL(filePath).toString();
}

function getPreloadPath(): string {
  return path.join(app.getAppPath(), 'dist', 'preload', 'index.cjs');
}

/**
 * PNG для иконки окна / дока: тот же растр, что electron-builder берёт из `build/icon.png`
 * (копия в dist после сборки), затем окно 256px, затем dev-пути. SVG не используем для
 * nativeImage на Windows — иначе пустая картинка и дефолтная иконка Electron вместо exe.
 */
function resolveBrandingPngPaths(): string[] {
  const root = app.getAppPath();
  return [
    path.join(root, 'dist', 'renderer', 'app-pack-icon.png'),
    path.join(root, 'dist', 'renderer', 'app-window-icon.png'),
    path.join(root, 'build', 'icon.png'),
    path.join(root, 'app', 'renderer', 'public', 'app-window-icon.png'),
  ];
}

function resolveWindowIconPath(): string | undefined {
  for (const p of resolveBrandingPngPaths()) {
    try {
      if (fs.existsSync(p)) return p;
    } catch {
      /* ignore */
    }
  }
  const root = app.getAppPath();
  const svgFallback = [
    path.join(root, 'dist', 'renderer', 'app-logo.svg'),
    path.join(root, 'app', 'renderer', 'public', 'app-logo.svg'),
  ];
  for (const p of svgFallback) {
    try {
      if (fs.existsSync(p)) return p;
    } catch {
      /* ignore */
    }
  }
  return undefined;
}

function resolveWindowIcon(): Electron.NativeImage | undefined {
  const tryPath = (filePath: string): Electron.NativeImage | undefined => {
    try {
      const img = nativeImage.createFromPath(filePath);
      if (!img.isEmpty()) return img;
    } catch {
      /* ignore */
    }
    return undefined;
  };

  if (process.platform === 'win32' || process.platform === 'linux') {
    for (const p of resolveBrandingPngPaths()) {
      if (!fs.existsSync(p)) continue;
      const img = tryPath(p);
      if (img) return img;
    }
    return undefined;
  }

  const p = resolveWindowIconPath();
  if (!p) return undefined;
  return tryPath(p);
}

/** macOS: в Dock показываем тот же PNG, что и у упакованного приложения на Windows (иконка exe). */
export function applyDockIconIfNeeded(): void {
  if (process.platform !== 'darwin' || !app.dock) return;
  for (const p of resolveBrandingPngPaths()) {
    if (!fs.existsSync(p)) continue;
    try {
      const img = nativeImage.createFromPath(p);
      if (img.isEmpty()) continue;
      app.dock.setIcon(img);
      return;
    } catch {
      /* try next */
    }
  }
}

function createWindow(kind: WindowKind): BrowserWindow {
  const icon = resolveWindowIcon();
  const win = new BrowserWindow({
    width: kind === 'editor' ? 1280 : kind === 'control' ? 1200 : 1280,
    height: 800,
    show: false,
    backgroundColor: '#09090B',
    ...(icon ? { icon } : {}),
    webPreferences: {
      contextIsolation: true,
      sandbox: true,
      nodeIntegration: false,
      devTools: isDev(),
      preload: getPreloadPath(),
      autoplayPolicy: 'no-user-gesture-required',
    },
  });

  win.webContents.on('preload-error', (_event, preloadPath, error) => {
    console.error(`[preload-error] ${preloadPath}:`, error);
  });
  win.webContents.on('did-fail-load', (_event, errorCode, errorDescription, validatedURL) => {
    console.error(`[did-fail-load] ${String(errorCode)} ${errorDescription} ${validatedURL}`);
  });

  win.once('ready-to-show', () => win.show());
  void win.loadURL(getRendererUrl(kind));
  if (kind === 'editor') {
    win.on('close', (e) => {
      if (appQuitting) return;
      e.preventDefault();
      quitAppFromEditorClose();
    });
  }
  win.on('closed', () => windows.delete(kind));
  windows.set(kind, win);
  return win;
}

export function createWindows() {
  if (!windows.has('editor')) {
    createWindow('editor');
  }
}

export function focusEditorWindow(): void {
  const win = windows.get('editor');
  if (win) {
    if (win.isMinimized()) win.restore();
    win.show();
    win.focus();
  } else {
    createWindows();
  }
}

export function openMultiWindow() {
  if (!windows.has('presentation')) {
    const display = screen.getPrimaryDisplay();
    const { x, y, width, height } = display.bounds;
    const win = createWindow('presentation');
    win.setBounds({ x, y, width, height });
    win.setMenuBarVisibility(false);
    win.maximize();
  }
  if (!windows.has('control')) {
    createWindow('control');
  }
}

export function closeMultiWindow(): void {
  const pres = windows.get('presentation');
  const ctrl = windows.get('control');
  if (pres) pres.close();
  if (ctrl) ctrl.close();
}

export function togglePresentationFullscreen(): boolean {
  const pres = windows.get('presentation');
  if (!pres) return false;
  const next = !pres.isFullScreen();
  pres.setFullScreen(next);
  return pres.isFullScreen();
}