import { useEffect, useMemo, useRef, useState } from 'react';

import { ipcChannels } from '../../../shared/ipc/contracts';
import type { AssetId, GraphNodeId, Project, ProjectId, Scene, SceneId } from '../../../shared/types';
import { getDndApi } from '../../shared/dndApi';

type ProjectSummary = { id: ProjectId; name: string; updatedAt: string; fileName: string };

type State = {
  projects: ProjectSummary[];
  project: Project | null;
  selectedSceneId: SceneId | null;
};

type Actions = {
  refreshProjects: () => Promise<void>;
  createProject: (name: string) => Promise<void>;
  openProject: (id: ProjectId) => Promise<void>;
  closeProject: () => Promise<void>;
  createScene: () => Promise<void>;
  selectScene: (id: SceneId) => Promise<void>;
  updateScene: (
    sceneId: SceneId,
    patch: {
      title?: string;
      description?: string;
      previewAssetId?: AssetId | null;
      previewAssetType?: 'image' | 'video' | null;
      previewVideoAutostart?: boolean;
      previewRotationDeg?: 0 | 90 | 180 | 270;
      settings?: Partial<Scene['settings']>;
      media?: Partial<Scene['media']>;
      layout?: { x: number; y: number };
    },
  ) => Promise<void>;
  updateConnections: (sceneId: SceneId, connections: SceneId[]) => Promise<void>;
  importMediaToScene: (sceneId: SceneId) => Promise<void>;
  importScenePreview: (sceneId: SceneId) => Promise<void>;
  clearScenePreview: (sceneId: SceneId) => Promise<void>;
  updateSceneGraphNodePosition: (nodeId: GraphNodeId, x: number, y: number) => Promise<void>;
  addSceneGraphNode: (sceneId: SceneId, x: number, y: number) => Promise<void>;
  removeSceneGraphNode: (nodeId: GraphNodeId) => Promise<void>;
  addSceneGraphEdge: (sourceGraphNodeId: GraphNodeId, targetGraphNodeId: GraphNodeId) => Promise<void>;
  removeSceneGraphEdge: (edgeId: string) => Promise<void>;
  setSceneGraphNodeStart: (graphNodeId: GraphNodeId | null) => Promise<void>;
  deleteScene: (sceneId: SceneId) => Promise<void>;
  renameProject: (name: string, fileBaseName: string) => Promise<void>;
  importProject: () => Promise<void>;
  exportProject: (projectId: ProjectId) => Promise<void>;
  deleteProject: (projectId: ProjectId) => Promise<void>;
};

function randomId(prefix: string): string {
  return `${prefix}_${Math.random().toString(16).slice(2)}_${Date.now().toString(16)}`;
}

export function useProjectState(licenseActive: boolean): readonly [State, Actions] {
  const api = getDndApi();
  const [state, setState] = useState<State>({ projects: [], project: null, selectedSceneId: null });
  const projectRef = useRef<Project | null>(null);
  useEffect(() => {
    projectRef.current = state.project;
  }, [state.project]);

  const actions = useMemo<Actions>(() => {
    const refreshProjects = async () => {
      const res = await api.invoke(ipcChannels.project.list, {});
      setState((s) => ({ ...s, projects: res.projects }));
    };

    const createProject = async (name: string) => {
      const res = await api.invoke(ipcChannels.project.create, { name });
      setState((s) => ({ ...s, project: res.project, selectedSceneId: res.project.currentSceneId }));
      await refreshProjects();
    };

    const openProject = async (id: ProjectId) => {
      const res = await api.invoke(ipcChannels.project.open, { projectId: id });
      setState((s) => ({ ...s, project: res.project, selectedSceneId: res.project.currentSceneId }));
    };

    const closeProject = async () => {
      setState((s) => ({ ...s, project: null, selectedSceneId: null }));
      if (licenseActive) await refreshProjects();
    };

    const createScene = async () => {
      const p = projectRef.current;
      if (!p) return;
      const sceneId = randomId('scene') as SceneId;
      const scene: Scene = {
        id: sceneId,
        title: `Новая сцена`,
        description: '',
        previewAssetId: null,
        previewAssetType: null,
        previewVideoAutostart: false,
        previewRotationDeg: 0,
        media: { videos: [], audios: [] },
        settings: { autoplayVideo: false, autoplayAudio: true, loopVideo: true, loopAudio: true },
        connections: [],
        layout: { x: 0, y: 0 },
      };

      await api.invoke(ipcChannels.project.updateScene, {
        sceneId,
        patch: {
          title: scene.title,
          description: scene.description,
          media: scene.media,
          settings: scene.settings,
          layout: scene.layout,
          previewAssetId: scene.previewAssetId,
          previewAssetType: scene.previewAssetType,
          previewVideoAutostart: scene.previewVideoAutostart,
        },
      });
      await api.invoke(ipcChannels.project.setCurrentScene, { sceneId });
      const res = await api.invoke(ipcChannels.project.get, {});
      setState((s) => ({ ...s, project: res.project, selectedSceneId: sceneId }));
    };

    const selectScene = async (id: SceneId) => {
      setState((s) => ({ ...s, selectedSceneId: id }));
      await api.invoke(ipcChannels.project.setCurrentScene, { sceneId: id });
    };

    const updateScene = async (
      sceneId: SceneId,
      patch: {
        title?: string;
        description?: string;
        previewAssetId?: AssetId | null;
        previewAssetType?: 'image' | 'video' | null;
        previewVideoAutostart?: boolean;
        previewRotationDeg?: 0 | 90 | 180 | 270;
        settings?: Partial<Scene['settings']>;
        media?: Partial<Scene['media']>;
        layout?: { x: number; y: number };
      },
    ) => {
      setState((s) => {
        const p = s.project;
        if (!p) return s;
        const scene = p.scenes[sceneId];
        if (!scene) return s;
        const next: Scene = {
          ...scene,
          ...(patch.title !== undefined ? { title: patch.title } : null),
          ...(patch.description !== undefined ? { description: patch.description } : null),
          ...(patch.previewAssetId !== undefined ? { previewAssetId: patch.previewAssetId } : null),
          ...(patch.previewAssetType !== undefined ? { previewAssetType: patch.previewAssetType } : null),
          ...(patch.previewVideoAutostart !== undefined
            ? { previewVideoAutostart: patch.previewVideoAutostart }
            : null),
          ...(patch.previewRotationDeg !== undefined
            ? { previewRotationDeg: patch.previewRotationDeg }
            : null),
          ...(patch.settings ? { settings: { ...scene.settings, ...patch.settings } } : null),
          ...(patch.media ? { media: { ...scene.media, ...patch.media } } : null),
          layout: patch.layout ? { ...scene.layout, ...patch.layout } : scene.layout,
        };
        const scenes = { ...p.scenes, [sceneId]: next };
        const project: Project = { ...p, scenes };
        return { ...s, project };
      });
      await api.invoke(ipcChannels.project.updateScene, { sceneId, patch });
    };

    const updateConnections = async (sceneId: SceneId, connections: SceneId[]) => {
      setState((s) => {
        const p = s.project;
        if (!p) return s;
        const scene = p.scenes[sceneId];
        if (!scene) return s;
        const next: Scene = { ...scene, connections };
        const scenes = { ...p.scenes, [sceneId]: next };
        const project: Project = { ...p, scenes };
        return { ...s, project };
      });
      await api.invoke(ipcChannels.project.updateConnections, { sceneId, connections });
    };

    const importMediaToScene = async (sceneId: SceneId) => {
      const res = await api.invoke(ipcChannels.project.importMedia, { sceneId });
      setState((s) => ({ ...s, project: res.project }));
      await refreshProjects();
    };

    const importScenePreview = async (sceneId: SceneId) => {
      const res = await api.invoke(ipcChannels.project.importScenePreview, { sceneId });
      setState((s) => ({ ...s, project: res.project }));
      await refreshProjects();
    };

    const clearScenePreview = async (sceneId: SceneId) => {
      const res = await api.invoke(ipcChannels.project.clearScenePreview, { sceneId });
      setState((s) => ({ ...s, project: res.project }));
      await refreshProjects();
    };

    const updateSceneGraphNodePosition = async (nodeId: GraphNodeId, x: number, y: number) => {
      setState((s) => {
        const p = s.project;
        if (!p) return s;
        return {
          ...s,
          project: {
            ...p,
            sceneGraphNodes: p.sceneGraphNodes.map((n) => (n.id === nodeId ? { ...n, x, y } : n)),
          },
        };
      });
      const res = await api.invoke(ipcChannels.project.updateSceneGraphNodePosition, { nodeId, x, y });
      setState((s) => ({ ...s, project: res.project }));
    };

    const addSceneGraphNode = async (sceneId: SceneId, x: number, y: number) => {
      const res = await api.invoke(ipcChannels.project.addSceneGraphNode, { sceneId, x, y });
      setState((s) => ({ ...s, project: res.project }));
    };

    const removeSceneGraphNode = async (nodeId: GraphNodeId) => {
      const res = await api.invoke(ipcChannels.project.removeSceneGraphNode, { nodeId });
      setState((s) => ({ ...s, project: res.project }));
    };

    const addSceneGraphEdge = async (sourceGraphNodeId: GraphNodeId, targetGraphNodeId: GraphNodeId) => {
      const res = await api.invoke(ipcChannels.project.addSceneGraphEdge, {
        sourceGraphNodeId,
        targetGraphNodeId,
      });
      setState((s) => ({ ...s, project: res.project }));
    };

    const removeSceneGraphEdge = async (edgeId: string) => {
      const res = await api.invoke(ipcChannels.project.removeSceneGraphEdge, { edgeId });
      setState((s) => ({ ...s, project: res.project }));
    };

    const setSceneGraphNodeStart = async (graphNodeId: GraphNodeId | null) => {
      const res = await api.invoke(ipcChannels.project.setSceneGraphNodeStart, { graphNodeId });
      setState((s) => ({ ...s, project: res.project }));
    };

    const deleteScene = async (sceneId: SceneId) => {
      const res = await api.invoke(ipcChannels.project.deleteScene, { sceneId });
      setState((s) => ({
        ...s,
        project: res.project,
        selectedSceneId: res.project.currentSceneId ?? null,
      }));
      await refreshProjects();
    };

    const renameProject = async (name: string, fileBaseName: string) => {
      const res = await api.invoke(ipcChannels.project.rename, { name, fileBaseName });
      setState((s) => ({ ...s, project: res.project }));
      await refreshProjects();
    };

    const importProject = async () => {
      const res = await api.invoke(ipcChannels.project.importZip, {});
      if (res.canceled) return;
      setState((s) => ({
        ...s,
        project: res.project,
        selectedSceneId: res.project.currentSceneId,
      }));
      await refreshProjects();
    };

    const exportProject = async (projectId: ProjectId) => {
      const res = await api.invoke(ipcChannels.project.exportZip, { projectId });
      if (res.canceled) return;
    };

    const deleteProject = async (projectId: ProjectId) => {
      await api.invoke(ipcChannels.project.deleteProject, { projectId });
      const listRes = await api.invoke(ipcChannels.project.list, {});
      const res = await api.invoke(ipcChannels.project.get, {});
      setState((s) => ({
        ...s,
        projects: listRes.projects,
        project: res.project,
        selectedSceneId: res.project?.currentSceneId ?? null,
      }));
    };

    return {
      refreshProjects,
      createProject,
      openProject,
      closeProject,
      createScene,
      selectScene,
      updateScene,
      updateConnections,
      importMediaToScene,
      importScenePreview,
      clearScenePreview,
      updateSceneGraphNodePosition,
      addSceneGraphNode,
      removeSceneGraphNode,
      addSceneGraphEdge,
      removeSceneGraphEdge,
      setSceneGraphNodeStart,
      deleteScene,
      renameProject,
      importProject,
      exportProject,
      deleteProject,
    };
  }, [api, licenseActive]);

  useEffect(() => {
    if (!licenseActive) {
      queueMicrotask(() => {
        setState({ projects: [], project: null, selectedSceneId: null });
      });
      return;
    }
    void (async () => {
      const listRes = await api.invoke(ipcChannels.project.list, {});
      setState((s) => ({ ...s, projects: listRes.projects }));
      const res = await api.invoke(ipcChannels.project.get, {});
      setState((s) => ({ ...s, project: res.project, selectedSceneId: res.project?.currentSceneId ?? null }));
    })();
  }, [licenseActive, api]);

  return [state, actions] as const;
}