import React, { useEffect, useState } from 'react';
import { Download, Search, Calendar, Filter, MessageSquare, Mic, Video, Eye, X, Play, User, Bot, Clock } from 'lucide-react';
import { Button, Input, TableHeader, TableRow, TableHead, TableCell, Badge, Drawer } from '../components/UI';
import { CallLog, InteractionType } from '../types';
import { fetchHistory, fetchHistoryDetail } from '../services/backendApi';

export const HistoryPage: React.FC = () => {
  const [logs, setLogs] = useState<CallLog[]>([]);
  const [searchTerm, setSearchTerm] = useState('');
  const [statusFilter, setStatusFilter] = useState<'all' | 'connected' | 'missed'>('all');
  const [sourceFilter, setSourceFilter] = useState<'all' | 'debug' | 'external'>('all');
  const [typeFilter, setTypeFilter] = useState<'all' | InteractionType>('all');
  const [isLoading, setIsLoading] = useState(true);
  const [selectedLog, setSelectedLog] = useState<CallLog | null>(null);
  const [isDetailLoading, setIsDetailLoading] = useState(false);

  useEffect(() => {
    const loadHistory = async () => {
      setIsLoading(true);
      try {
        const list = await fetchHistory();
        setLogs(list);
      } catch (error) {
        console.error(error);
        alert('加载历史记录失败，请检查后端服务。');
      } finally {
        setIsLoading(false);
      }
    };

    loadHistory();
  }, []);

  const filteredLogs = logs.filter(log => {
    const matchesSearch = log.agentName.toLowerCase().includes(searchTerm.toLowerCase());
    const matchesStatus = statusFilter === 'all' || log.status === statusFilter;
    const matchesSource = sourceFilter === 'all' || log.source === sourceFilter;
    const matchesType = typeFilter === 'all' || log.type === typeFilter;
    return matchesSearch && matchesStatus && matchesSource && matchesType;
  });

  const handleExport = () => {
    // Generate CSV content
    const headers = ['ID', 'Agent', 'Source', 'Type', 'Status', 'Start Time', 'Duration'];
    const rows = filteredLogs.map(log => [
        log.id, 
        log.agentName, 
        log.source,
        log.type,
        log.status, 
        log.startTime, 
        log.duration
    ].join(','));
    const csvContent = "data:text/csv;charset=utf-8," + [headers.join(','), ...rows].join('\n');
    const encodedUri = encodeURI(csvContent);
    const link = document.createElement("a");
    link.setAttribute("href", encodedUri);
    link.setAttribute("download", "history_logs.csv");
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
  };

  const openDetail = async (log: CallLog) => {
    setSelectedLog(log);
    setIsDetailLoading(true);
    try {
      const detail = await fetchHistoryDetail(log.id, log);
      setSelectedLog(detail);
    } catch (error) {
      console.error(error);
      alert('加载通话详情失败。');
    } finally {
      setIsDetailLoading(false);
    }
  };

  return (
    <div className="space-y-6 animate-in fade-in py-4 pb-10">
      <div className="flex items-center justify-between">
        <h1 className="text-2xl font-bold tracking-tight text-white">历史记录</h1>
        <Button variant="outline" onClick={handleExport}>
            <Download className="mr-2 h-4 w-4" /> 导出记录
        </Button>
      </div>

      <div className="grid grid-cols-1 md:grid-cols-5 gap-4 bg-card/50 p-4 rounded-lg border border-white/5 shadow-sm">
         <div className="relative">
             <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
             <Input 
                placeholder="搜索代理小助手..." 
                className="pl-9 border-0 bg-white/5" 
                value={searchTerm} 
                onChange={e => setSearchTerm(e.target.value)}
             />
         </div>
         <div className="flex items-center space-x-2">
            <Filter className="h-4 w-4 text-muted-foreground" />
            <select 
                className="flex h-9 w-full rounded-md border-0 bg-white/5 px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-primary/50 [&>option]:bg-card text-foreground"
                value={sourceFilter}
                onChange={(e) => setSourceFilter(e.target.value as any)}
            >
                <option value="all">所有来源</option>
                <option value="debug">调试 (Debug)</option>
                <option value="external">外部测试 (External)</option>
            </select>
         </div>
         <div className="flex items-center space-x-2">
            <select 
                className="flex h-9 w-full rounded-md border-0 bg-white/5 px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-primary/50 [&>option]:bg-card text-foreground"
                value={typeFilter}
                onChange={(e) => setTypeFilter(e.target.value as any)}
            >
                <option value="all">所有类型</option>
                <option value="text">文本 (Text)</option>
                <option value="audio">语音 (Audio)</option>
                <option value="video">视频 (Video)</option>
            </select>
         </div>
         <div className="flex items-center space-x-2">
            <select 
                className="flex h-9 w-full rounded-md border-0 bg-white/5 px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-primary/50 [&>option]:bg-card text-foreground"
                value={statusFilter}
                onChange={(e) => setStatusFilter(e.target.value as any)}
            >
                <option value="all">所有状态</option>
                <option value="connected">已接通</option>
                <option value="missed">未接通</option>
            </select>
         </div>
         <div className="relative">
            <Calendar className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
            <Input type="date" className="pl-9 border-0 bg-white/5" />
         </div>
      </div>

      <div className="rounded-md border border-white/5 bg-card/40 backdrop-blur-md overflow-hidden">
        <table className="w-full text-sm">
          <TableHeader>
            <TableRow>
              <TableHead>编号</TableHead>
              <TableHead>代理小助手</TableHead>
              <TableHead>类型</TableHead>
              <TableHead>来源</TableHead>
              <TableHead>接听状态</TableHead>
              <TableHead>通话接通时间</TableHead>
              <TableHead>通话时长</TableHead>
            </TableRow>
          </TableHeader>
          <tbody>
            {!isLoading && filteredLogs.map(log => (
              <TableRow key={log.id} className="cursor-pointer hover:bg-white/5 group" onClick={() => openDetail(log)}>
                <TableCell className="font-mono text-xs text-muted-foreground group-hover:text-primary transition-colors">#{log.id}</TableCell>
                <TableCell className="font-medium text-white group-hover:text-primary transition-colors flex items-center gap-2">
                    {log.agentName}
                </TableCell>
                <TableCell>
                    <div className="flex items-center gap-1.5">
                        {log.type === 'text' && <MessageSquare className="w-3.5 h-3.5 text-blue-400" />}
                        {log.type === 'audio' && <Mic className="w-3.5 h-3.5 text-orange-400" />}
                        {log.type === 'video' && <Video className="w-3.5 h-3.5 text-green-400" />}
                        <span className="capitalize text-xs">{log.type}</span>
                    </div>
                </TableCell>
                <TableCell>
                    <Badge variant="outline">{log.source === 'debug' ? '调试' : '外部'}</Badge>
                </TableCell>
                <TableCell>
                    <Badge variant={log.status === 'connected' ? 'success' : 'warning'}>
                        {log.status === 'connected' ? '已接通' : '未接通'}
                    </Badge>
                </TableCell>
                <TableCell className="text-muted-foreground">{log.startTime}</TableCell>
                <TableCell className="text-muted-foreground">{log.duration}</TableCell>
              </TableRow>
            ))}
             {!isLoading && filteredLogs.length === 0 && (
                 <TableRow>
                     <TableCell colSpan={7} className="text-center py-6 text-muted-foreground">暂无记录</TableCell>
                 </TableRow>
             )}
             {isLoading && (
                 <TableRow>
                     <TableCell colSpan={7} className="text-center py-6 text-muted-foreground">加载中...</TableCell>
                 </TableRow>
             )}
          </tbody>
        </table>
      </div>

      {selectedLog && (
        <Drawer 
            isOpen={!!selectedLog} 
            onClose={() => setSelectedLog(null)} 
            title="通话详情与对话记录"
        >
            <div className="flex flex-col h-full overflow-hidden">
                <div className="shrink-0 mb-4 p-4 bg-white/5 rounded-xl border border-white/10 space-y-3">
                    <div className="flex items-center justify-between">
                        <h3 className="font-bold text-lg text-white">{selectedLog.agentName}</h3>
                        <Badge variant="outline" className="uppercase">{selectedLog.type} Record</Badge>
                    </div>
                    <div className="grid grid-cols-2 gap-4 text-xs text-muted-foreground">
                        <div>ID: <span className="font-mono text-white/70">#{selectedLog.id}</span></div>
                        <div>时间: <span className="text-white/70">{selectedLog.startTime}</span></div>
                        <div>时长: <span className="text-white/70">{selectedLog.duration}</span></div>
                        <div>状态: <span className={selectedLog.status === 'connected' ? 'text-green-400' : 'text-yellow-400'}>{selectedLog.status}</span></div>
                    </div>
                </div>

                <div className="flex-1 overflow-y-auto space-y-6 pr-2 custom-scrollbar pb-6 px-1">
                    {isDetailLoading && (
                        <div className="text-sm text-muted-foreground text-center py-8">详情加载中...</div>
                    )}
                    {!isDetailLoading && (selectedLog.details && selectedLog.details.length > 0) ? (
                        selectedLog.details.map((detail, index) => (
                            <div key={index} className={`flex gap-3 ${detail.role === 'user' ? 'flex-row-reverse' : 'flex-row'}`}>
                                <div className={`w-8 h-8 rounded-full flex items-center justify-center shrink-0 border border-white/10 ${detail.role === 'user' ? 'bg-primary/20 text-primary' : 'bg-white/5 text-muted-foreground'}`}>
                                    {detail.role === 'user' ? <User className="w-4 h-4" /> : <Bot className="w-4 h-4" />}
                                </div>
                                
                                <div className={`flex flex-col max-w-[85%] ${detail.role === 'user' ? 'items-end' : 'items-start'}`}>
                                    <div className="flex items-center gap-2 mb-1 opacity-60">
                                        <span className="text-[10px] uppercase font-bold tracking-wider">{detail.role === 'user' ? 'User' : 'Assistant'}</span>
                                        <span className="text-[10px] font-mono">{detail.timestamp}</span>
                                    </div>

                                    <div className={`rounded-2xl p-3 shadow-sm text-sm leading-relaxed border ${
                                        detail.role === 'user' 
                                        ? 'bg-primary/10 border-primary/20 text-white rounded-tr-none' 
                                        : 'bg-card border-white/10 text-white/90 rounded-tl-none'
                                    }`}>
                                        {/* Video Frames */}
                                        {selectedLog.type === 'video' && detail.role === 'user' && detail.imageUrls && detail.imageUrls.length > 0 && (
                                            <div className="flex gap-2 overflow-x-auto mb-2 pb-1 custom-scrollbar">
                                                {detail.imageUrls.map((url, i) => (
                                                    <div key={i} className="relative h-16 w-24 rounded-lg overflow-hidden border border-white/10 bg-black/50 shrink-0 group">
                                                        <img src={url} alt={`Frame ${i}`} className="h-full w-full object-cover" />
                                                        <div className="absolute inset-0 flex items-center justify-center bg-black/40 opacity-0 group-hover:opacity-100 transition-opacity">
                                                            <Eye className="w-4 h-4 text-white" />
                                                        </div>
                                                    </div>
                                                ))}
                                            </div>
                                        )}

                                        {/* Content */}
                                        <div>{detail.content}</div>

                                        {/* Audio Player Placeholder */}
                                        {selectedLog.type !== 'text' && (
                                            <div className="mt-2 flex items-center gap-2 p-1.5 rounded-lg bg-black/20 border border-white/5 w-full min-w-[160px]">
                                                <button className="w-5 h-5 rounded-full bg-white/10 hover:bg-primary hover:text-white flex items-center justify-center transition-colors shrink-0">
                                                    <Play size={8} className="ml-0.5" />
                                                </button>
                                                <div className="h-1 flex-1 bg-white/10 rounded-full overflow-hidden">
                                                    <div className="h-full w-1/3 bg-primary/50"></div>
                                                </div>
                                                <span className="text-[9px] font-mono text-muted-foreground">00:05</span>
                                            </div>
                                        )}
                                    </div>
                                </div>
                            </div>
                        ))
                    ) : !isDetailLoading ? (
                        <div className="h-full flex flex-col items-center justify-center text-muted-foreground opacity-40 space-y-3">
                            <MessageSquare className="w-12 h-12 stroke-1" />
                            <p className="text-sm font-medium">暂无对话记录</p>
                        </div>
                    ) : null}
                </div>
            </div>
        </Drawer>
      )}
    </div>
  );
};