import { useState } from 'react';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Input } from '@/components/ui/input';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { 
  Search, 
  ExternalLink, 
  Plus, 
  Edit2, 
  Trash2,
  Folder,
  LayoutGrid,
  List,
  Star,
  Settings
} from 'lucide-react';
import { navigationGroups, navigationLinks } from '@/mocks/data';

interface NavLink {
  id: string;
  name: string;
  url: string;
  icon?: string;
  description?: string;
  groupId: string;
  isFavorite?: boolean;
  tags?: string[];
}

interface NavGroup {
  id: string;
  name: string;
  icon?: string;
  description?: string;
  linkCount?: number;
}

export function NavigationPage() {
  const [searchQuery, setSearchQuery] = useState('');
  const [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');
  const [selectedGroup, setSelectedGroup] = useState<string>('all');
  const [showFavoritesOnly, setShowFavoritesOnly] = useState(false);

  const groups = navigationGroups;
  const links = navigationLinks;

  const filteredLinks = links.filter(link => {
    const matchesSearch = link.name.toLowerCase().includes(searchQuery.toLowerCase()) ||
                         link.description?.toLowerCase().includes(searchQuery.toLowerCase()) ||
                         link.tags?.some(tag => tag.toLowerCase().includes(searchQuery.toLowerCase()));
    const matchesGroup = selectedGroup === 'all' || link.groupId === selectedGroup;
    const matchesFavorite = !showFavoritesOnly || link.isFavorite;
    return matchesSearch && matchesGroup && matchesFavorite;
  });

  const groupedLinks = groups.map(group => ({
    ...group,
    links: filteredLinks.filter(link => link.groupId === group.id)
  })).filter(group => group.links.length > 0);

  const stats = {
    totalLinks: links.length,
    totalGroups: groups.length,
    favorites: links.filter(l => l.isFavorite).length,
  };

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-slate-100">站内导航</h1>
          <p className="text-slate-400 mt-1">管理内部系统和常用链接</p>
        </div>
        <div className="flex items-center gap-2">
          <Button variant="outline" className="border-slate-700 text-slate-300 hover:bg-slate-800">
            <Settings className="h-4 w-4 mr-2" />
            管理分组
          </Button>
          <Button className="bg-blue-600 hover:bg-blue-700">
            <Plus className="h-4 w-4 mr-2" />
            添加链接
          </Button>
        </div>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-3 gap-4">
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">链接总数</p>
                <p className="text-2xl font-bold text-slate-100 mt-1">{stats.totalLinks}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-blue-500/20 flex items-center justify-center">
                <ExternalLink className="h-5 w-5 text-blue-400" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">分组数</p>
                <p className="text-2xl font-bold text-slate-100 mt-1">{stats.totalGroups}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-purple-500/20 flex items-center justify-center">
                <Folder className="h-5 w-5 text-purple-400" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">收藏</p>
                <p className="text-2xl font-bold text-yellow-400 mt-1">{stats.favorites}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-yellow-500/20 flex items-center justify-center">
                <Star className="h-5 w-5 text-yellow-400" />
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      {/* Filters */}
      <div className="flex items-center gap-4">
        <div className="relative flex-1 max-w-md">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-slate-400" />
          <Input
            placeholder="搜索链接名称、描述或标签..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="pl-10 bg-slate-800 border-slate-700 text-slate-100"
          />
        </div>
        <select
          value={selectedGroup}
          onChange={(e) => setSelectedGroup(e.target.value)}
          className="px-3 py-2 bg-slate-800 border border-slate-700 rounded-md text-slate-100 text-sm"
        >
          <option value="all">全部分组</option>
          {groups.map(group => (
            <option key={group.id} value={group.id}>{group.name}</option>
          ))}
        </select>
        <Button
          variant={showFavoritesOnly ? 'default' : 'outline'}
          size="sm"
          onClick={() => setShowFavoritesOnly(!showFavoritesOnly)}
          className={showFavoritesOnly ? 'bg-yellow-600 hover:bg-yellow-700' : 'border-slate-700 text-slate-300'}
        >
          <Star className="h-4 w-4 mr-1" />
          收藏
        </Button>
        <div className="flex items-center gap-1 border border-slate-700 rounded-md p-1">
          <Button
            variant={viewMode === 'grid' ? 'secondary' : 'ghost'}
            size="icon"
            className="h-8 w-8"
            onClick={() => setViewMode('grid')}
          >
            <LayoutGrid className="h-4 w-4" />
          </Button>
          <Button
            variant={viewMode === 'list' ? 'secondary' : 'ghost'}
            size="icon"
            className="h-8 w-8"
            onClick={() => setViewMode('list')}
          >
            <List className="h-4 w-4" />
          </Button>
        </div>
      </div>

      {/* Navigation Content */}
      <div className="space-y-6">
        {selectedGroup === 'all' && !searchQuery && !showFavoritesOnly ? (
          // Grouped view
          groupedLinks.map(group => (
            <div key={group.id}>
              <div className="flex items-center gap-2 mb-3">
                <Folder className="h-5 w-5 text-blue-400" />
                <h2 className="text-lg font-semibold text-slate-100">{group.name}</h2>
                <Badge variant="secondary" className="bg-slate-700 text-slate-300">
                  {group.links.length}
                </Badge>
              </div>
              {viewMode === 'grid' ? (
                <div className="grid grid-cols-4 gap-4">
                  {group.links.map(link => (
                    <NavLinkCard key={link.id} link={link} />
                  ))}
                </div>
              ) : (
                <div className="space-y-2">
                  {group.links.map(link => (
                    <NavLinkRow key={link.id} link={link} />
                  ))}
                </div>
              )}
            </div>
          ))
        ) : (
          // Flat view
          viewMode === 'grid' ? (
            <div className="grid grid-cols-4 gap-4">
              {filteredLinks.map(link => (
                <NavLinkCard key={link.id} link={link} />
              ))}
            </div>
          ) : (
            <div className="space-y-2">
              {filteredLinks.map(link => (
                <NavLinkRow key={link.id} link={link} />
              ))}
            </div>
          )
        )}
      </div>
    </div>
  );
}

function NavLinkCard({ link }: { link: NavLink }) {
  return (
    <Card className="bg-slate-800 border-slate-700 hover:border-blue-500/50 transition-colors group">
      <CardContent className="p-4">
        <div className="flex items-start justify-between">
          <div className="flex items-start gap-3">
            <div className="w-10 h-10 rounded-lg bg-gradient-to-br from-blue-500 to-cyan-500 flex items-center justify-center text-white font-bold text-lg">
              {link.name.slice(0, 2)}
            </div>
            <div className="flex-1 min-w-0">
              <h3 className="font-medium text-slate-100 truncate">{link.name}</h3>
              <p className="text-xs text-slate-400 mt-0.5 line-clamp-2">{link.description}</p>
            </div>
          </div>
          <div className="flex items-center gap-1 opacity-0 group-hover:opacity-100 transition-opacity">
            <Button variant="ghost" size="icon" className="h-7 w-7 text-slate-400 hover:text-yellow-400">
              <Star className={`h-4 w-4 ${link.isFavorite ? 'fill-yellow-400 text-yellow-400' : ''}`} />
            </Button>
            <Button variant="ghost" size="icon" className="h-7 w-7 text-slate-400 hover:text-blue-400">
              <Edit2 className="h-4 w-4" />
            </Button>
          </div>
        </div>
        <div className="flex items-center justify-between mt-3 pt-3 border-t border-slate-700">
          <div className="flex gap-1">
            {link.tags?.map(tag => (
              <Badge key={tag} variant="secondary" className="bg-slate-700 text-slate-300 text-xs">
                {tag}
              </Badge>
            ))}
          </div>
          <Button variant="ghost" size="sm" className="h-7 px-2 text-blue-400 hover:text-blue-300" asChild>
            <a href={link.url} target="_blank" rel="noopener noreferrer">
              <ExternalLink className="h-3 w-3 mr-1" />
              访问
            </a>
          </Button>
        </div>
      </CardContent>
    </Card>
  );
}

function NavLinkRow({ link }: { link: NavLink }) {
  return (
    <Card className="bg-slate-800 border-slate-700 hover:border-blue-500/50 transition-colors">
      <CardContent className="p-3">
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-3">
            <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-blue-500 to-cyan-500 flex items-center justify-center text-white font-bold text-sm">
              {link.name.slice(0, 2)}
            </div>
            <div>
              <h3 className="font-medium text-slate-100">{link.name}</h3>
              <p className="text-xs text-slate-400">{link.description}</p>
            </div>
          </div>
          <div className="flex items-center gap-4">
            <div className="flex gap-1">
              {link.tags?.map(tag => (
                <Badge key={tag} variant="secondary" className="bg-slate-700 text-slate-300 text-xs">
                  {tag}
                </Badge>
              ))}
            </div>
            <div className="flex items-center gap-1">
              <Button variant="ghost" size="icon" className="h-7 w-7 text-slate-400 hover:text-yellow-400">
                <Star className={`h-4 w-4 ${link.isFavorite ? 'fill-yellow-400 text-yellow-400' : ''}`} />
              </Button>
              <Button variant="ghost" size="icon" className="h-7 w-7 text-slate-400 hover:text-blue-400">
                <Edit2 className="h-4 w-4" />
              </Button>
              <Button variant="ghost" size="sm" className="h-7 px-2 text-blue-400 hover:text-blue-300" asChild>
                <a href={link.url} target="_blank" rel="noopener noreferrer">
                  <ExternalLink className="h-3 w-3 mr-1" />
                  访问
                </a>
              </Button>
            </div>
          </div>
        </div>
      </CardContent>
    </Card>
  );
}