/**
 * Collabora Online 相关的自定义 hooks
 *
 * 功能：
 * - useCollaboraConfig: 加载 Collabora 配置（使用 Remix useFetcher）
 * - useDocumentReady: 监听文档加载完成
 * - useCollaboraUnoCommands: UNO 命令封装
 *
 * @encoding UTF-8
 */

import { RefObject, useCallback, useEffect, useState, useMemo } from 'react';
import { useFetcher } from '@remix-run/react';
import { toastService } from '../ui/Toast';
import type { CollaboraConfig } from './types';
import {
  unoSearchText,
  unoReplaceText,
  unoHighlightText,
  unoRemoveHighlight,
  unoEscape,
  unoScrollToTop,
  unoSave,
  unoZoomPlus,
  unoZoomMinus,
  unoSetZoom,
  unoGotoPage,
  unoFirstPage,
  unoLastPage,
} from './lib';
import { COLLABORA_URL } from '~/config/api-config';

// ==================== 1. 配置加载 ====================

/**
 * 加载 Collabora 配置（使用 Remix useFetcher）
 * @param fileId - 文件路径
 * @param mode - 模式（view 或 edit）
 * @param userId - 用户 ID
 * @param userName - 用户名
 * @returns 配置、加载状态、错误信息
 */
export function useCollaboraConfig(
  fileId: string,
  mode: 'view' | 'edit',
  userId: string,
  userName: string
) {
  const fetcher = useFetcher<CollaboraConfig>();
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (fetcher.state === 'idle' && !fetcher.data) {
      // 构建查询参数
      const params = new URLSearchParams({
        fileId,
        mode,
        userId,
        userName,
      });

      // 加载配置
      fetcher.load(`/api/collabora/config?${params}`);
    }
  }, [fileId, mode, userId, userName, fetcher]);

  // 检查错误
  useEffect(() => {
    if (fetcher.data && 'error' in fetcher.data) {
      const errorMessage = (fetcher.data as any).error || '加载配置失败';
      setError(errorMessage);
      toastService.error(`加载文档配置失败: ${errorMessage}`);
    }
  }, [fetcher.data]);

  return {
    config: fetcher.data && !('error' in fetcher.data) ? fetcher.data : null,
    loading: fetcher.state === 'loading',
    error,
  };
}

// ==================== 2. 文档加载状态监听 ====================

/**
 * 监听文档加载完成
 * @param iframeRef - iframe 引用
 * @returns 文档加载状态
 */
export function useDocumentReady(iframeRef: RefObject<HTMLIFrameElement>) {
  const [isDocumentLoaded, setIsDocumentLoaded] = useState(false);

  useEffect(() => {
    const handleMessage = (event: MessageEvent) => {
      // 验证消息来源
      const collaboraOrigin = new URL(COLLABORA_URL).origin;

      if (event.origin !== collaboraOrigin) {
        return;
      }

      try {
        const msg = typeof event.data === 'string' ? JSON.parse(event.data) : event.data;

        if (msg.MessageId === 'App_LoadingStatus' && msg.Values?.Status === 'Document_Loaded') {
          console.log('[DocumentReady] 文档加载完成');
          setIsDocumentLoaded(true);
        }
      } catch (err) {
        console.warn('[DocumentReady] 解析消息失败:', err);
      }
    };

    window.addEventListener('message', handleMessage);
    return () => {
      window.removeEventListener('message', handleMessage);
    };
  }, [iframeRef]);

  return { isDocumentLoaded };
}

// ==================== 3. UNO 命令封装 ====================

/**
 * UNO 命令封装（React Hook）
 * @param iframeRef - iframe 引用
 * @returns UNO 命令方法集合
 */
export function useCollaboraUnoCommands(iframeRef: RefObject<HTMLIFrameElement>) {
  /**
   * 搜索文本（用于定位）
   */
  const searchText = useCallback(
    async (text: string) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }
      console.log(`[UNO] 搜索文本: "${text}"`);
      await unoSearchText(iframeRef.current.contentWindow, text);
      await new Promise((resolve) => setTimeout(resolve, 100));
    },
    [iframeRef]
  );

  /**
   * 定位文本（搜索 + 立即取消选中）
   * 用于"只看不改"的场景，避免蓝色选中背景
   */
  const locateText = useCallback(
    async (text: string) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }

      console.log(`[UNO] 定位文本(无选中): "${text}"`);

      // 1. 执行搜索（滚动到目标并选中）
      await searchText(text);

      // 2. 等待渲染完成
      await new Promise((resolve) => setTimeout(resolve, 50));

      // 3. 取消选中（去除蓝色背景，保留视图位置）
      unoEscape(iframeRef.current.contentWindow);

      console.log(`[UNO] 定位完成，已取消选中`);
    },
    [searchText, iframeRef]
  );

  /**
   * 替换文本（ReplaceAll）
   */
  const replaceText = useCallback(
    async (searchText: string, replaceText: string) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }
      console.log(`[UNO] 替换文本: "${searchText}" -> "${replaceText}"`);
      await unoReplaceText(iframeRef.current.contentWindow, searchText, replaceText);
      await new Promise((resolve) => setTimeout(resolve, 200));
    },
    [iframeRef]
  );

  /**
   * 高亮文本
   */
  const highlightText = useCallback(
    async (text: string, color?: number) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }
      console.log(`[UNO] 高亮文本: "${text}"`);
      await unoHighlightText(iframeRef.current.contentWindow, text, color);
      await new Promise((resolve) => setTimeout(resolve, 200));
    },
    [iframeRef]
  );

  /**
   * 移除高亮
   */
  const removeHighlight = useCallback(
    async (text: string) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }
      console.log(`[UNO] 移除高亮: "${text}"`);
      await unoRemoveHighlight(iframeRef.current.contentWindow, text);
      await new Promise((resolve) => setTimeout(resolve, 200));
    },
    [iframeRef]
  );

  /**
   * 取消选中（Escape）
   */
  const escapeSelection = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 取消选中');
    await unoEscape(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 50));
  }, [iframeRef]);

  /**
   * 滚动到文档顶部
   */
  const scrollToTop = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 滚动到顶部');
    await unoScrollToTop(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 100));
  }, [iframeRef]);

  /**
   * 保存文档
   */
  const saveDocument = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 保存文档');
    await unoSave(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 1000));
  }, [iframeRef]);

  /**
   * 放大文档
   */
  const zoomIn = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 放大文档');
    await unoZoomPlus(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 100));
  }, [iframeRef]);

  /**
   * 缩小文档
   */
  const zoomOut = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 缩小文档');
    await unoZoomMinus(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 100));
  }, [iframeRef]);

  /**
   * 设置缩放比例
   * @param percentage - 缩放百分比 (例如：100 表示 100%)
   */
  const setZoom = useCallback(
    async (percentage: number) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }

      console.log(`[UNO] 设置缩放比例: ${percentage}%`);
      await unoSetZoom(iframeRef.current.contentWindow, percentage);
      await new Promise((resolve) => setTimeout(resolve, 100));
    },
    [iframeRef]
  );

  /**
   * 跳转到指定页面
   * @param pageNumber - 页码（从1开始）
   */
  const gotoPage = useCallback(
    async (pageNumber: number) => {
      if (!iframeRef.current?.contentWindow) {
        console.warn('[UNO] iframe 不可用');
        return;
      }

      console.log(`[UNO] 跳转到第 ${pageNumber} 页`);
      await unoGotoPage(iframeRef.current.contentWindow, pageNumber);
      await new Promise((resolve) => setTimeout(resolve, 100));
    },
    [iframeRef]
  );

  /**
   * 跳转到第一页
   */
  const gotoFirstPage = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 跳转到第一页');
    await unoFirstPage(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 100));
  }, [iframeRef]);

  /**
   * 跳转到最后一页
   */
  const gotoLastPage = useCallback(async () => {
    if (!iframeRef.current?.contentWindow) {
      console.warn('[UNO] iframe 不可用');
      return;
    }

    console.log('[UNO] 跳转到最后一页');
    await unoLastPage(iframeRef.current.contentWindow);
    await new Promise((resolve) => setTimeout(resolve, 100));
  }, [iframeRef]);

  return useMemo(
    () => ({
      searchText,
      locateText,
      replaceText,
      highlightText,
      removeHighlight,
      escapeSelection,
      scrollToTop,
      saveDocument,
      zoomIn,
      zoomOut,
      setZoom,
      gotoPage,
      gotoFirstPage,
      gotoLastPage,
    }),
    [
      searchText,
      locateText,
      replaceText,
      highlightText,
      removeHighlight,
      escapeSelection,
      scrollToTop,
      saveDocument,
      zoomIn,
      zoomOut,
      setZoom,
      gotoPage,
      gotoFirstPage,
      gotoLastPage,
    ]
  );
}