'use client';

import { useEffect, useState } from 'react';
import Link from 'next/link';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { StatusBadge, StatusDot } from '@/components/status-badge';
import { useUser } from '@/components/user-context';
import type { Project, User } from '@/types/database';
import { Plus, Users, Target, ArrowRight } from 'lucide-react';

interface ProjectWithRelations extends Project {
  owner: User | null;
  pm: User | null;
}

export default function ProjectsPage() {
  const { currentUser } = useUser();
  const [projects, setProjects] = useState<ProjectWithRelations[]>([]);
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
    async function fetchProjects() {
      try {
        const res = await fetch('/api/projects');
        if (res.ok) {
          const data = await res.json();
          setProjects(data);
        }
      } catch (error) {
        console.error('Failed to fetch projects:', error);
      } finally {
        setIsLoading(false);
      }
    }

    fetchProjects();
  }, []);

  const canCreate = currentUser?.role === 'owner' || currentUser?.role === 'pm';

  if (isLoading) {
    return (
      <div className="max-w-7xl mx-auto px-4 py-8">
        <div className="animate-pulse space-y-6">
          <div className="h-8 bg-slate-200 rounded w-32" />
          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
            {[1, 2, 3].map(i => (
              <div key={i} className="h-48 bg-slate-200 rounded-lg" />
            ))}
          </div>
        </div>
      </div>
    );
  }

  return (
    <div className="max-w-7xl mx-auto px-4 py-8">
      <div className="flex items-center justify-between mb-8">
        <div>
          <h1 className="text-2xl font-bold text-slate-800">项目列表</h1>
          <p className="text-muted-foreground mt-1">共 {projects.length} 个项目</p>
        </div>
        {canCreate && (
          <Button asChild className="bg-teal-600 hover:bg-teal-700">
            <Link href="/projects/new">
              <Plus className="h-4 w-4 mr-2" />
              新建项目
            </Link>
          </Button>
        )}
      </div>

      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
        {projects.map(project => (
          <Link key={project.id} href={`/projects/${project.id}`}>
            <Card className="h-full hover:shadow-md transition-shadow cursor-pointer">
              <CardHeader className="pb-2">
                <div className="flex items-start justify-between">
                  <CardTitle className="text-lg">{project.name}</CardTitle>
                  <StatusBadge status={project.status} size="sm" />
                </div>
                {project.project_type && (
                  <span className="text-xs text-muted-foreground bg-slate-100 px-2 py-0.5 rounded">
                    {project.project_type}
                  </span>
                )}
              </CardHeader>
              <CardContent className="space-y-4">
                {project.description && (
                  <p className="text-sm text-muted-foreground line-clamp-2">
                    {project.description}
                  </p>
                )}
                <div className="flex items-center gap-4 text-sm">
                  <div className="flex items-center gap-1.5 text-muted-foreground">
                    <Users className="h-4 w-4" />
                    <span>{project.pm?.name || '未指定PM'}</span>
                  </div>
                </div>
                <div className="flex items-center justify-between pt-2 border-t">
                  <span className="text-xs text-muted-foreground">
                    负责人: {project.owner?.name || '未指定'}
                  </span>
                  <ArrowRight className="h-4 w-4 text-muted-foreground" />
                </div>
              </CardContent>
            </Card>
          </Link>
        ))}

        {projects.length === 0 && (
          <div className="col-span-full text-center py-12">
            <Target className="h-12 w-12 text-slate-300 mx-auto mb-4" />
            <p className="text-muted-foreground">暂无项目</p>
            {canCreate && (
              <Button asChild className="mt-4" variant="outline">
                <Link href="/projects/new">
                  <Plus className="h-4 w-4 mr-2" />
                  创建第一个项目
                </Link>
              </Button>
            )}
          </div>
        )}
      </div>
    </div>
  );
}