import React, { useState, useEffect } from 'react';
import { Search, X } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { ScrollArea } from '@/components/ui/scroll-area';
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
import { get } from '@/api/request';

// 微信好友接口类型
interface WechatFriend {
  id: string;
  nickname: string;
  wechatId: string;
  avatar: string;
  customer: string;
}

// 好友列表API响应类型
interface FriendsResponse {
  code: number;
  msg: string;
  data: {
    list: Array<{
      id: number;
      nickname: string;
      wechatId: string;
      avatar?: string;
      customer?: string;
    }>;
    total: number;
    page: number;
    limit: number;
  };
}

// 获取好友列表API函数
const fetchFriendsList = async (page: number = 1, limit: number = 20, deviceIds: string[]): Promise<FriendsResponse> => {
  if (deviceIds.length === 0) {
    return {
      code: 200,
      msg: 'success',
      data: {
        list: [],
        total: 0,
        page,
        limit
      }
    };
  }
  
  const deviceIdsParam = deviceIds.join(',');
  return get<FriendsResponse>(`/v1/friend?page=${page}&limit=${limit}&deviceIds=${deviceIdsParam}`);
};

// 组件属性接口
interface FriendSelectionProps {
  selectedFriends: string[];
  onSelect: (friends: string[]) => void;
  deviceIds: string[];
  placeholder?: string;
  className?: string;
}

export default function FriendSelection({ 
  selectedFriends, 
  onSelect, 
  deviceIds,
  placeholder = "选择微信好友",
  className = ""
}: FriendSelectionProps) {
  const [dialogOpen, setDialogOpen] = useState(false);
  const [friends, setFriends] = useState<WechatFriend[]>([]);
  const [searchQuery, setSearchQuery] = useState('');
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [totalFriends, setTotalFriends] = useState(0);
  const [loading, setLoading] = useState(false);

  // 当弹窗打开时获取好友列表
  useEffect(() => {
    if (dialogOpen && deviceIds.length > 0) {
      fetchFriends(currentPage);
    }
  }, [dialogOpen, currentPage, deviceIds]);

  // 当设备ID变化时，重置页码
  useEffect(() => {
    if (deviceIds.length > 0) {
      setCurrentPage(1);
    }
  }, [deviceIds]);

  // 获取好友列表API
  const fetchFriends = async (page: number) => {
    if (deviceIds.length === 0) return;
    
    setLoading(true);
    try {
      const res = await fetchFriendsList(page, 20, deviceIds);
      
      if (res && res.code === 200 && res.data) {
        setFriends(res.data.list.map((friend) => ({
          id: friend.id?.toString() || '',
          nickname: friend.nickname || '',
          wechatId: friend.wechatId || '',
          avatar: friend.avatar || '',
          customer: friend.customer || '',
        })));
        
        setTotalFriends(res.data.total || 0);
        setTotalPages(Math.ceil((res.data.total || 0) / 20));
      }
    } catch (error) {
      console.error('获取好友列表失败:', error);
    } finally {
      setLoading(false);
    }
  };

  // 过滤好友
  const filteredFriends = friends.filter(friend =>
    friend.nickname.toLowerCase().includes(searchQuery.toLowerCase()) ||
    friend.wechatId.toLowerCase().includes(searchQuery.toLowerCase())
  );

  // 处理好友选择
  const handleFriendToggle = (friendId: string) => {
    if (selectedFriends.includes(friendId)) {
      onSelect(selectedFriends.filter(id => id !== friendId));
    } else {
      onSelect([...selectedFriends, friendId]);
    }
  };

  // 获取显示文本
  const getDisplayText = () => {
    if (selectedFriends.length === 0) return '';
    return `已选择 ${selectedFriends.length} 个好友`;
  };

  const handleConfirm = () => {
    setDialogOpen(false);
  };

  return (
    <>
      {/* 输入框 */}
      <div className={`relative ${className}`}>
        <span className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400">
          <svg width="20" height="20" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z" />
          </svg>
        </span>
        <Input
          placeholder={placeholder}
          className="pl-10 h-12 rounded-xl border-gray-200 text-base"
          readOnly
          onClick={() => setDialogOpen(true)}
          value={getDisplayText()}
        />
      </div>

      {/* 微信好友选择弹窗 */}
      <Dialog open={dialogOpen} onOpenChange={setDialogOpen}>
        <DialogContent className="max-w-xl max-h-[90vh] flex flex-col p-0 gap-0 overflow-hidden">
          <div className="p-6">
            <DialogTitle className="text-center text-xl font-medium mb-6">选择微信好友</DialogTitle>
            
            <div className="relative mb-4">
              <Input
                placeholder="搜索好友"
                value={searchQuery}
                onChange={(e) => setSearchQuery(e.target.value)}
                className="pl-10 py-2 rounded-full border-gray-200"
              />
              <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-gray-400" />
              <Button 
                variant="ghost" 
                size="icon" 
                className="absolute right-2 top-1/2 -translate-y-1/2 h-6 w-6 rounded-full"
                onClick={() => setSearchQuery('')}
              >
                <X className="h-4 w-4" />
              </Button>
            </div>
          </div>

          <ScrollArea className="flex-1 overflow-y-auto">
            {loading ? (
              <div className="flex items-center justify-center h-full">
                <div className="text-gray-500">加载中...</div>
              </div>
            ) : filteredFriends.length > 0 ? (
              <div className="divide-y">
                {filteredFriends.map((friend) => (
                  <label
                    key={friend.id}
                    className="flex items-center px-6 py-4 hover:bg-gray-50 cursor-pointer"
                    onClick={() => handleFriendToggle(friend.id)}
                  >
                    <div className="mr-3 flex items-center justify-center">
                      <div className={`w-5 h-5 rounded-full border ${selectedFriends.includes(friend.id) ? 'border-blue-600' : 'border-gray-300'} flex items-center justify-center`}>
                        {selectedFriends.includes(friend.id) && (
                          <div className="w-3 h-3 rounded-full bg-blue-600"></div>
                        )}
                      </div>
                    </div>
                    <div className="flex items-center space-x-3 flex-1">
                      <div className="w-10 h-10 rounded-full bg-gradient-to-r from-blue-400 to-purple-500 flex items-center justify-center text-white text-sm font-medium overflow-hidden">
                        {friend.avatar ? (
                          <img src={friend.avatar} alt={friend.nickname} className="w-full h-full object-cover" />
                        ) : (
                          friend.nickname.charAt(0)
                        )}
                      </div>
                      <div className="flex-1">
                        <div className="font-medium">{friend.nickname}</div>
                        <div className="text-sm text-gray-500">微信ID: {friend.wechatId}</div>
                        {friend.customer && (
                          <div className="text-sm text-gray-400">归属客户: {friend.customer}</div>
                        )}
                      </div>
                    </div>
                  </label>
                ))}
              </div>
            ) : (
              <div className="flex items-center justify-center h-full">
                <div className="text-gray-500">
                  {deviceIds.length === 0 ? '请先选择设备' : '没有找到好友'}
                </div>
              </div>
            )}
          </ScrollArea>

          <div className="border-t p-4 flex items-center justify-between bg-white">
            <div className="text-sm text-gray-500">
              总计 {totalFriends} 个好友
            </div>
            <div className="flex items-center space-x-2">
              <Button
                variant="ghost"
                size="sm"
                onClick={() => setCurrentPage(Math.max(1, currentPage - 1))}
                disabled={currentPage === 1 || loading}
                className="px-2 py-0 h-8 min-w-0"
              >
                &lt;
              </Button>
              <span className="text-sm">{currentPage} / {totalPages}</span>
              <Button
                variant="ghost"
                size="sm"
                onClick={() => setCurrentPage(Math.min(totalPages, currentPage + 1))}
                disabled={currentPage === totalPages || loading}
                className="px-2 py-0 h-8 min-w-0"
              >
                &gt;
              </Button>
            </div>
          </div>

          <div className="border-t p-4 flex items-center justify-between bg-white">
            <Button variant="outline" onClick={() => setDialogOpen(false)} className="px-6 rounded-full border-gray-300">
              取消
            </Button>
            <Button onClick={handleConfirm} className="px-6 bg-blue-600 hover:bg-blue-700 rounded-full">
              确定 ({selectedFriends.length})
            </Button>
          </div>
        </DialogContent>
      </Dialog>
    </>
  );
}