"use client"

import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar"
import { Badge } from "@/components/ui/badge"
import { Button } from "@/components/ui/button"
import { Card, CardContent, CardFooter, CardHeader } from "@/components/ui/card"
import { EmptyState } from "@/components/ui/empty-state"
import { listGames, listPosts } from "@/lib/api"
import { roleLabels } from "@/lib/constants"
import type { Game, Post } from "@/lib/types"
import { Heart, MessageCircle, PenSquare, Pin } from "lucide-react"
import Link from "next/link"
import { useEffect, useState } from "react"

export default function CommunityPage() {
  const [games, setGames] = useState<Game[]>([])
  const [posts, setPosts] = useState<Post[]>([])
  const [postsLoading, setPostsLoading] = useState(true)

  const [sortMode, setSortMode] = useState<"latest" | "hot">("latest")
  const [selectedGame, setSelectedGame] = useState<string | null>(null)

  useEffect(() => {
    let cancelled = false

    Promise.all([listGames(), listPosts()])
      .then(([gamesItems, postsItems]) => {
        if (cancelled) return
        setGames(gamesItems)
        setPosts(postsItems)
        setPostsLoading(false)
      })
      .catch(() => {
        if (cancelled) return
        setGames([])
        setPosts([])
        setPostsLoading(false)
      })

    return () => {
      cancelled = true
    }
  }, [])

  const filteredPosts = posts
    .filter((post) => {
      if (!selectedGame) return true
      return post.tags.includes(selectedGame)
    })
    .sort((a, b) => {
      if (sortMode === "latest") {
        return new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime()
      }
      const scoreA = a.likeCount + a.commentCount
      const scoreB = b.likeCount + b.commentCount
      return scoreB - scoreA
    })

  return (
    <div className="container mx-auto py-8 px-4 max-w-2xl">
      <div className="flex items-center justify-between mb-6">
        <h1 className="text-2xl font-bold">社区</h1>
        <Button asChild>
          <Link href="/post/new">
            <PenSquare className="mr-1 h-4 w-4" />
            发帖
          </Link>
        </Button>
      </div>

      <div className="flex flex-col gap-4 mb-6">
        <div className="flex items-center gap-2">
          <Button
            variant={sortMode === "latest" ? "default" : "outline"}
            size="sm"
            onClick={() => setSortMode("latest")}
          >
            最新
          </Button>
          <Button
            variant={sortMode === "hot" ? "default" : "outline"}
            size="sm"
            onClick={() => setSortMode("hot")}
          >
            最热
          </Button>
        </div>
        <div className="flex flex-wrap gap-2">
          {games.map((game) => (
            <Button
              key={game.id}
              variant={selectedGame === game.name ? "default" : "outline"}
              size="sm"
              className="h-7 rounded-full px-3"
              onClick={() => setSelectedGame(selectedGame === game.name ? null : game.name)}
            >
              {game.name}
            </Button>
          ))}
        </div>
      </div>

      <div className="flex flex-col gap-4">
        {postsLoading ? (
          <div className="text-center py-12 text-muted-foreground">加载中...</div>
        ) : filteredPosts.length === 0 ? (
          <EmptyState title="暂无帖子" description="此分类下暂未找到相关的讨论内容" />
        ) : (
          filteredPosts.map((post) => (
            <Link key={post.id} href={`/post/${post.id}`} className="block">
              <Card className="shadow-sm border-border/80 gap-4">
                <CardHeader>
                  <div className="flex items-center gap-3">
                    <Avatar className="h-9 w-9">
                      <AvatarImage src={post.author.avatar} />
                      <AvatarFallback>{post.author.nickname[0]}</AvatarFallback>
                    </Avatar>
                    <div className="flex-1 min-w-0">
                      <div className="flex items-center gap-2">
                        <span className="text-sm font-medium">{post.author.nickname}</span>
                        <Badge variant="outline" className="text-[10px] px-1.5 py-0">
                          {roleLabels[post.author.role]}
                        </Badge>
                        {post.pinned && <Pin className="h-3 w-3 text-muted-foreground" />}
                      </div>
                      <span className="text-xs text-muted-foreground">
                        {new Date(post.createdAt).toLocaleDateString("zh-CN")}
                      </span>
                    </div>
                  </div>
                </CardHeader>
                <CardContent>
                  <h3 className="font-semibold mb-1">{post.title}</h3>
                  <p className="text-sm text-muted-foreground line-clamp-2">{post.content}</p>
                  {post.tags.length > 0 && (
                    <div className="flex flex-wrap gap-1 mt-2">
                      {post.tags.map((tag) => (
                        <Badge key={tag} variant="secondary" className="text-xs">
                          {tag}
                        </Badge>
                      ))}
                    </div>
                  )}
                </CardContent>
                <CardFooter className="text-sm text-muted-foreground gap-4">
                  <span className="flex items-center gap-1">
                    <Heart
                      className={`h-4 w-4 ${post.liked ? "fill-destructive text-destructive" : ""}`}
                    />
                    {post.likeCount}
                  </span>
                  <span className="flex items-center gap-1">
                    <MessageCircle className="h-4 w-4" />
                    {post.commentCount}
                  </span>
                </CardFooter>
              </Card>
            </Link>
          ))
        )}
      </div>
    </div>
  )
}