import { useState, useEffect, useRef, useCallback } from 'react';
import styles from './DebugConsole.module.css';

interface LogEntry {
  id: number;
  timestamp: string;
  level: 'info' | 'warn' | 'error' | 'debug';
  source: 'main' | 'renderer' | 'grpc' | 'tss' | 'account';
  message: string;
}

interface DebugConsoleProps {
  isOpen: boolean;
  onClose: () => void;
}

let logIdCounter = 0;

export default function DebugConsole({ isOpen, onClose }: DebugConsoleProps) {
  const [logs, setLogs] = useState<LogEntry[]>([]);
  const [filter, setFilter] = useState<string>('all');
  const [autoScroll, setAutoScroll] = useState(true);
  const [isPaused, setIsPaused] = useState(false);
  const logsEndRef = useRef<HTMLDivElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);

  const addLog = useCallback((entry: Omit<LogEntry, 'id' | 'timestamp'>) => {
    if (isPaused) return;

    const now = new Date();
    const ms = now.getMilliseconds().toString().padStart(3, '0');
    const newEntry: LogEntry = {
      ...entry,
      id: ++logIdCounter,
      timestamp: `${now.toLocaleTimeString('zh-CN', {
        hour12: false,
        hour: '2-digit',
        minute: '2-digit',
        second: '2-digit',
      })}.${ms}`,
    };

    setLogs(prev => {
      const newLogs = [...prev, newEntry];
      // 保留最近 500 条日志
      if (newLogs.length > 500) {
        return newLogs.slice(-500);
      }
      return newLogs;
    });
  }, [isPaused]);

  useEffect(() => {
    if (!isOpen) return;

    // 订阅主进程的日志
    const handleMainLog = (_event: unknown, data: { level: string; source: string; message: string }) => {
      addLog({
        level: data.level as LogEntry['level'],
        source: data.source as LogEntry['source'],
        message: data.message,
      });
    };

    // 使用 IPC 监听日志事件
    window.electronAPI?.debug?.subscribeLogs(handleMainLog);

    // 拦截 console 方法来捕获前端日志
    const originalConsole = {
      log: console.log,
      warn: console.warn,
      error: console.error,
      debug: console.debug,
    };

    console.log = (...args) => {
      originalConsole.log(...args);
      addLog({ level: 'info', source: 'renderer', message: args.map(String).join(' ') });
    };
    console.warn = (...args) => {
      originalConsole.warn(...args);
      addLog({ level: 'warn', source: 'renderer', message: args.map(String).join(' ') });
    };
    console.error = (...args) => {
      originalConsole.error(...args);
      addLog({ level: 'error', source: 'renderer', message: args.map(String).join(' ') });
    };
    console.debug = (...args) => {
      originalConsole.debug(...args);
      addLog({ level: 'debug', source: 'renderer', message: args.map(String).join(' ') });
    };

    return () => {
      // 恢复原始 console
      console.log = originalConsole.log;
      console.warn = originalConsole.warn;
      console.error = originalConsole.error;
      console.debug = originalConsole.debug;

      window.electronAPI?.debug?.unsubscribeLogs();
    };
  }, [isOpen, addLog]);

  useEffect(() => {
    if (autoScroll && logsEndRef.current) {
      logsEndRef.current.scrollIntoView({ behavior: 'smooth' });
    }
  }, [logs, autoScroll]);

  const handleScroll = () => {
    if (!containerRef.current) return;
    const { scrollTop, scrollHeight, clientHeight } = containerRef.current;
    // 如果用户手动滚动到顶部，暂停自动滚动
    setAutoScroll(scrollHeight - scrollTop - clientHeight < 50);
  };

  const clearLogs = () => {
    setLogs([]);
    logIdCounter = 0;
  };

  const filteredLogs = logs.filter(log => {
    if (filter === 'all') return true;
    if (filter === 'errors') return log.level === 'error' || log.level === 'warn';
    return log.source === filter;
  });

  const getLevelClass = (level: string) => {
    switch (level) {
      case 'error': return styles.error;
      case 'warn': return styles.warn;
      case 'debug': return styles.debug;
      default: return styles.info;
    }
  };

  const getSourceColor = (source: string) => {
    switch (source) {
      case 'main': return '#61afef';
      case 'grpc': return '#c678dd';
      case 'tss': return '#e5c07b';
      case 'account': return '#56b6c2';
      default: return '#98c379';
    }
  };

  if (!isOpen) return null;

  return (
    <div className={styles.overlay}>
      <div className={styles.console}>
        <div className={styles.header}>
          <h3>🔧 Debug Console</h3>
          <div className={styles.controls}>
            <select
              value={filter}
              onChange={(e) => setFilter(e.target.value)}
              className={styles.filter}
            >
              <option value="all">All</option>
              <option value="errors">Errors/Warnings</option>
              <option value="main">Main Process</option>
              <option value="renderer">Renderer</option>
              <option value="grpc">gRPC</option>
              <option value="tss">TSS</option>
              <option value="account">Account</option>
            </select>
            <button
              className={`${styles.btn} ${isPaused ? styles.paused : ''}`}
              onClick={() => setIsPaused(!isPaused)}
            >
              {isPaused ? '▶️ Resume' : '⏸️ Pause'}
            </button>
            <button
              className={`${styles.btn} ${autoScroll ? styles.active : ''}`}
              onClick={() => setAutoScroll(!autoScroll)}
            >
              ⬇️ Auto-scroll
            </button>
            <button className={styles.btn} onClick={clearLogs}>
              🗑️ Clear
            </button>
            <button className={styles.closeBtn} onClick={onClose}>
              ✕
            </button>
          </div>
        </div>
        <div
          className={styles.logs}
          ref={containerRef}
          onScroll={handleScroll}
        >
          {filteredLogs.length === 0 ? (
            <div className={styles.empty}>No logs yet...</div>
          ) : (
            filteredLogs.map(log => (
              <div key={log.id} className={`${styles.logEntry} ${getLevelClass(log.level)}`}>
                <span className={styles.timestamp}>{log.timestamp}</span>
                <span
                  className={styles.source}
                  style={{ color: getSourceColor(log.source) }}
                >
                  [{log.source.toUpperCase()}]
                </span>
                <span className={styles.message}>{log.message}</span>
              </div>
            ))
          )}
          <div ref={logsEndRef} />
        </div>
        <div className={styles.footer}>
          <span>{filteredLogs.length} logs</span>
          <span>Press F12 for DevTools</span>
        </div>
      </div>
    </div>
  );
}