/**
 * Collabora Online 文档查看器组件
 *
 * 功能：
 * - 加载 Collabora Online iframe
 * - 管理文档加载状态
 * - 提供 UNO 命令接口
 * - 支持只读和编辑模式
 *
 * @encoding UTF-8
 */

import { useRef, forwardRef, useImperativeHandle, useState } from 'react';
import type { CollaboraViewerProps, CollaboraViewerHandle } from './types';
import { useCollaboraConfig, useDocumentReady, useCollaboraUnoCommands } from './hooks';
import { sendUnoCommand } from './Uno';
import { highlightText } from './lib/Highlightselecttext';
import { clearHighlights } from './lib/ClearHighlight';
import { unoScrollToTop, requestPageInfo, customGotoPage, type PageInfo, type GotoPageResponse } from './lib';

/**
 * Collabora 文档查看器组件
 * @param props - 组件属性
 * @param ref - 父组件传入的 ref，用于暴露命令接口
 */
export const CollaboraViewer = forwardRef<CollaboraViewerHandle, CollaboraViewerProps>(
  function CollaboraViewer(
    {
      fileId,
      mode = 'view',
      userId = 'guest',
      userName = '',
    },
    ref
  ) {
    const iframeRef = useRef<HTMLIFrameElement>(null);

    // 高亮测试面板状态
    const [highlightTextInput, setHighlightTextInput] = useState('');
    const [highlightPage, setHighlightPage] = useState('');
    const [previousHighlightText, setPreviousHighlightText] = useState<string | null>(null);
    const [highlightResult, setHighlightResult] = useState<string | null>(null);

    // 清除高亮测试面板状态
    const [clearHighlightResult, setClearHighlightResult] = useState<string | null>(null);
    const [isClearing, setIsClearing] = useState(false);

    // 页数信息测试状态
    const [pageInfoResult, setPageInfoResult] = useState<string | null>(null);
    const [isLoadingPageInfo, setIsLoadingPageInfo] = useState(false);

    // 页面跳转测试状态
    const [gotoPageInput, setGotoPageInput] = useState('');
    const [gotoPageResult, setGotoPageResult] = useState<string | null>(null);
    const [isJumping, setIsJumping] = useState(false);

    // 1. 加载 Collabora 配置
    const { config, loading, error } = useCollaboraConfig(fileId, mode, userId, userName);

    // 2. 监听文档加载状态
    const { isDocumentLoaded } = useDocumentReady(iframeRef);

    // 3. UNO 命令封装
    const unoCommands = useCollaboraUnoCommands(iframeRef);

    // 4. 暴露接口给父组件
    useImperativeHandle(ref, () => ({
      unoCommands,
      isReady: isDocumentLoaded,
      mode,
      getIframeWindow: () => iframeRef.current?.contentWindow || null,
    }), [unoCommands, isDocumentLoaded, mode]);


  // 加载中状态
  if (loading) {
    return (
      <div className="flex justify-center items-center h-full min-h-[600px]">
        <div className="text-center">
          <div className="inline-block animate-spin rounded-full h-12 w-12 border-b-2 border-primary"></div>
          <p className="mt-4 text-gray-600">加载文档配置中...</p>
        </div>
      </div>
    );
  }

  // 错误状态
  if (error || !config) {
    return (
      <div className="flex justify-center items-center h-full min-h-[600px]">
        <div className="text-center text-red-500">
          <i className="ri-error-warning-line text-4xl mb-2"></i>
          <p className="text-lg">{error || '加载配置失败'}</p>
          <p className="text-sm text-gray-500 mt-2">请刷新页面重试或联系管理员</p>
        </div>
      </div>
    );
  }

  // 发送 UNO 命令的处理函数（测试用）
  // const sendUno = () => {
  //   if (!iframeRef.current?.contentWindow) {
  //     setUnoResult('iframe 不可用');
  //     return;
  //   }

  //   let args: Record<string, unknown> = {};
  //   const raw = (unoArgs || '').trim();
  //   if (raw !== '') {
  //     try {
  //       args = JSON.parse(raw) as Record<string, unknown>;
  //     } catch (err) {
  //       try {
  //         // fallback: replace single quotes with double quotes and parse
  //         args = JSON.parse(raw.replace(/'(.*?)'/g, '"$1"')) as Record<string, unknown>;
  //       } catch (err2) {
  //         console.error('解析 UNO Args 失败:', err2);
  //         setUnoResult('Args 解析失败，请使用有效 JSON');
  //         return;
  //       }
  //     }
  //   }

  //   try {
  //     // 使用正确的 sendUnoCommand 方法
  //     sendUnoCommand(iframeRef.current.contentWindow, unoCmd, args);
  //     setUnoResult(`已发送: ${unoCmd}`);
  //     console.log('[UNO Debug] 发送命令:', unoCmd, args);
  //   } catch (e) {
  //     console.error('发送 UNO 失败:', e);
  //     setUnoResult('发送失败，请查看控制台');
  //   }
  // };

  // 高亮测试处理函数
  const handleSwitchHighlight = async () => {
    if (!iframeRef.current?.contentWindow) {
      setHighlightResult('iframe 未就绪');
      return;
    }

    if (!highlightTextInput || highlightTextInput.trim() === '') {
      setHighlightResult('请输入要高亮的文本');
      return;
    }

    try {
      // 解析页码 (可选)
      const page = highlightPage && highlightPage.trim() !== ''
        ? parseInt(highlightPage.trim(), 10)
        : undefined;

      // 验证页码
      if (page !== undefined && (isNaN(page) || page < 1)) {
        setHighlightResult('页码必须是大于0的整数');
        return;
      }

      await highlightText(
        iframeRef.current.contentWindow,
        highlightTextInput.trim(),
        { page }
      );

      // 更新上一次高亮的文本
      setPreviousHighlightText(highlightTextInput.trim());
      const pageInfo = page ? ` (第${page}页)` : '';
      setHighlightResult(`✓ 已切换高亮: ${highlightTextInput.trim()}${pageInfo}`);
    } catch (e) {
      console.error('切换高亮失败:', e);
      setHighlightResult(`切换失败: ${e instanceof Error ? e.message : '未知错误'}`);
    }
  };

  // 滚动到顶部处理函数
  const handleScrollToTop = async () => {
    if (!iframeRef.current?.contentWindow) {
      console.error('iframe 未就绪');
      return;
    }

    try {
      await unoScrollToTop(iframeRef.current.contentWindow);
      console.log('[CollaboraViewer] 已滚动到文档顶部');
    } catch (e) {
      console.error('滚动到顶部失败:', e);
    }
  };

  // 获取页数信息处理函数
  const handleGetPageInfo = async () => {
    if (!iframeRef.current?.contentWindow) {
      setPageInfoResult('iframe 未就绪');
      return;
    }

    setIsLoadingPageInfo(true);
    setPageInfoResult('正在获取页数信息...');

    try {
      const info: PageInfo = await requestPageInfo(iframeRef.current.contentWindow);
      setPageInfoResult(
        `✓ 总页数: ${info.totalPages} | 当前页: ${info.currentPage + 1} (索引: ${info.currentPage})`
      );
      console.log('[CollaboraViewer] 页数信息:', info);

      // 3秒后清除提示
      setTimeout(() => {
        setPageInfoResult(null);
      }, 3000);
    } catch (e) {
      console.error('获取页数信息失败:', e);
      setPageInfoResult(`✗ 获取失败: ${e instanceof Error ? e.message : '未知错误'}`);

      // 5秒后清除错误提示
      setTimeout(() => {
        setPageInfoResult(null);
      }, 5000);
    } finally {
      setIsLoadingPageInfo(false);
    }
  };

  // 页面跳转处理函数
  const handleGotoPage = async () => {
    if (!iframeRef.current?.contentWindow) {
      setGotoPageResult('iframe 未就绪');
      return;
    }

    const pageNumber = parseInt(gotoPageInput.trim(), 10);
    if (isNaN(pageNumber) || pageNumber < 1) {
      setGotoPageResult('请输入有效的页码 (大于0的整数)');
      return;
    }

    setIsJumping(true);
    setGotoPageResult(`正在跳转到第 ${pageNumber} 页...`);

    try {
      const response: GotoPageResponse = await customGotoPage(
        iframeRef.current.contentWindow,
        pageNumber
      );
      setGotoPageResult(
        `✓ 已跳转到第 ${response.pageNumber} 页 (总页数: ${response.totalPages})`
      );
      console.log('[CollaboraViewer] 页面跳转成功:', response);

      // 3秒后清除提示
      setTimeout(() => {
        setGotoPageResult(null);
      }, 3000);
    } catch (e) {
      console.error('页面跳转失败:', e);
      setGotoPageResult(`✗ 跳转失败: ${e instanceof Error ? e.message : '未知错误'}`);

      // 5秒后清除错误提示
      setTimeout(() => {
        setGotoPageResult(null);
      }, 5000);
    } finally {
      setIsJumping(false);
    }
  };

  // 清除高亮处理函数
  const handleClearHighlights = async () => {
    if (!iframeRef.current?.contentWindow) {
      setClearHighlightResult('iframe 未就绪');
      return;
    }

    setIsClearing(true);
    setClearHighlightResult('正在清除高亮...');

    try {
      const result = await clearHighlights(iframeRef.current.contentWindow, {
        color: 16776960, // 黄色
        timeout: 10000,
      });

      if (result.success) {
        setClearHighlightResult(`✓ ${result.message}`);
        console.log('[CollaboraViewer] 清除高亮成功:', result);

        // 清空之前记录的高亮文本
        setPreviousHighlightText(null);
      } else {
        setClearHighlightResult(`✗ 清除失败: ${result.message}`);
        console.error('[CollaboraViewer] 清除高亮失败:', result);
      }

      // 3秒后清除提示
      setTimeout(() => {
        setClearHighlightResult(null);
      }, 3000);
    } catch (e) {
      console.error('清除高亮失败:', e);
      setClearHighlightResult(`✗ 清除失败: ${e instanceof Error ? e.message : '未知错误'}`);

      // 5秒后清除错误提示
      setTimeout(() => {
        setClearHighlightResult(null);
      }, 5000);
    } finally {
      setIsClearing(false);
    }
  };

  return (
    <div className="collabora-viewer relative w-full h-full min-h-[600px]">
      {/* UNO 命令测试面板 */}
      {/* <div className="absolute top-2 left-2 z-50 bg-white bg-opacity-90 px-2 py-1 rounded shadow flex items-center gap-2">
        <input
          className="px-2 py-1 border rounded text-sm w-48"
          value={unoCmd}
          onChange={(e) => setUnoCmd(e.target.value)}
          placeholder="UNO 命令"
          aria-label="UNO 命令"
        />
        <input
          className="px-2 py-1 border rounded text-sm w-64"
          value={unoArgs}
          onChange={(e) => setUnoArgs(e.target.value)}
          placeholder="UNO Args (JSON)"
          aria-label="UNO Args (JSON)"
        />
        <button
          className="px-3 py-1 bg-indigo-600 text-white rounded hover:bg-indigo-700 text-sm"
          onClick={sendUno}
        >
          发送 UNO
        </button>
        {unoResult && <span className="text-xs text-gray-500 ml-2">{unoResult}</span>}
      </div> */}

      {/* 高亮测试面板 */}
      <div className="absolute top-2 left-2 z-50 bg-white bg-opacity-90 px-3 py-2 rounded shadow flex items-center gap-2">
        <input
          className="px-3 py-1.5 border rounded text-sm w-64"
          value={highlightTextInput}
          onChange={(e) => setHighlightTextInput(e.target.value)}
          placeholder="输入要高亮的文本 (如: 合同编号)"
          aria-label="高亮文本"
          onKeyPress={(e) => {
            if (e.key === 'Enter') {
              handleSwitchHighlight();
            }
          }}
        />
        <input
          className="px-3 py-1.5 border rounded text-sm w-20"
          value={highlightPage}
          onChange={(e) => setHighlightPage(e.target.value)}
          placeholder="页码"
          aria-label="页码"
          type="number"
          min="1"
          onKeyPress={(e) => {
            if (e.key === 'Enter') {
              handleSwitchHighlight();
            }
          }}
        />
        <button
          className="px-4 py-1.5 bg-yellow-500 text-white rounded hover:bg-yellow-600 text-sm font-medium"
          onClick={handleSwitchHighlight}
          disabled={!isDocumentLoaded}
        >
          切换高亮
        </button>
        {previousHighlightText && (
          <span className="text-xs text-gray-600">
            上次: {previousHighlightText}
          </span>
        )}
        {highlightResult && (
          <span className="text-xs text-gray-700 ml-2">{highlightResult}</span>
        )}
      </div>

      {/* 清除高亮测试面板 */}
      <div className="absolute top-16 left-2 z-50 bg-white bg-opacity-90 px-3 py-2 rounded shadow flex items-center gap-2">
        <button
          className={`px-4 py-1.5 rounded text-sm font-medium transition-colors ${
            isClearing
              ? 'bg-gray-400 text-white cursor-not-allowed'
              : 'bg-red-500 text-white hover:bg-red-600'
          }`}
          onClick={handleClearHighlights}
          disabled={!isDocumentLoaded || isClearing}
        >
          {isClearing ? '清除中...' : '清除所有高亮'}
        </button>
        {clearHighlightResult && (
          <span className={`text-xs ml-2 ${
            clearHighlightResult.startsWith('✓') ? 'text-green-600' :
            clearHighlightResult.startsWith('✗') ? 'text-red-600' :
            'text-gray-600'
          }`}>
            {clearHighlightResult}
          </span>
        )}
      </div>

      {/* 文档加载提示 */}
      {!isDocumentLoaded && (
        <div className="absolute inset-0 flex items-center justify-center bg-white bg-opacity-90 z-10">
          <div className="text-center">
            <div className="inline-block animate-spin rounded-full h-12 w-12 border-b-2 border-primary"></div>
            <p className="mt-4 text-gray-600">正在加载文档...</p>
            <p className="text-sm text-gray-500 mt-2">{config.fileName}</p>
          </div>
        </div>
      )}

      {/* Collabora iframe - tabIndex is needed for keyboard navigation */}
      {/* eslint-disable jsx-a11y/no-noninteractive-tabindex */}
      <iframe
        ref={iframeRef}
        src={config.iframeUrl}
        className="w-full h-full border-0"
        style={{
          minHeight: '600px',
          height: '100%',
        }}
        allow="clipboard-read; clipboard-write"
        title={`Collabora Online - ${config.fileName}`}
        sandbox="allow-same-origin allow-scripts allow-forms allow-popups allow-modals"
        tabIndex={0}
      />
      {/* eslint-enable jsx-a11y/no-noninteractive-tabindex */}
    </div>
  );
});

// 导出类型和 hook
export type { CollaboraViewerHandle };
export { useCollaboraUnoCommands };