<?php

namespace App\Http\Controllers;

use App\Models\ForumBoard;
use App\Models\ForumReply;
use App\Models\ForumThread;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\View\View;

class ForumController extends Controller
{
    public function index(): View
    {
        $boards = ForumBoard::orderBy('sort')->orderBy('name')
            ->withCount(['threads' => fn ($q) => $q->where('status', ForumThread::STATUS_APPROVED)])
            ->get();

        return view('forum.index', compact('boards'));
    }

    public function board(ForumBoard $board): View
    {
        $threads = $board->threads()
            ->visible(Auth::user())
            ->with('user')
            ->orderByDesc('is_pinned')
            ->orderByDesc('last_reply_at')
            ->orderByDesc('created_at')
            ->paginate(15);

        return view('forum.board', compact('board', 'threads'));
    }

    public function thread(ForumThread $thread): View
    {
        if ($thread->trashed()) {
            abort(404);
        }

        $user = Auth::user();
        $isMod = $user && $user->canPerm('forum.moderate');
        $isOwner = $user && $thread->user_id === $user->id;

        // 待审且非作者、非审核员：不可见
        if ($thread->status !== ForumThread::STATUS_APPROVED && ! $isMod && ! $isOwner) {
            abort(404);
        }

        $thread->increment('views');

        $replies = $thread->replies()
            ->visible($user)
            ->with('user')
            ->orderBy('created_at')
            ->paginate(20);

        return view('forum.thread', compact('thread', 'replies'));
    }

    public function store(Request $request)
    {
        $data = $request->validate([
            'board_id' => ['required', 'exists:forum_boards,id'],
            'title' => ['required', 'string', 'max:120'],
            'body' => ['required', 'string', 'max:8000'],
        ]);

        $thread = ForumThread::create([
            'board_id' => $data['board_id'],
            'user_id' => Auth::id(),
            'title' => $data['title'],
            'body' => $data['body'],
            'status' => ForumThread::STATUS_PENDING,
            'last_reply_at' => now(),
        ]);

        $request->user()->awardPoints(10);

        return redirect()->route('forum.thread', $thread)
            ->with('success', '帖子已提交，管理员审核通过后将公开展示');
    }

    public function reply(Request $request, ForumThread $thread)
    {
        if ($thread->is_locked) {
            return back()->withErrors(['body' => '该帖子已锁定，无法回复。']);
        }

        // 待审帖子的回复入口对普通用户不可见（thread() 已拦截），此处仅作兜底
        if ($thread->status !== ForumThread::STATUS_APPROVED && ! Auth::user()?->canPerm('forum.moderate')) {
            return back()->withErrors(['body' => '该帖子尚未通过审核，暂不可回复。']);
        }

        $data = $request->validate([
            'body' => ['required', 'string', 'max:8000'],
        ]);

        ForumReply::create([
            'thread_id' => $thread->id,
            'user_id' => Auth::id(),
            'body' => $data['body'],
            'status' => ForumReply::STATUS_PENDING,
        ]);

        $thread->update(['last_reply_at' => now()]);

        $request->user()->awardPoints(5);

        return back()->with('success', '回复已提交，审核通过后将公开展示');
    }
}