<?php

/**
 * 文件功能：聊天室核心控制器
 * 接管原版 INIT.ASP, NEWSAY.ASP, LEAVE.ASP 的所有职责
 *
 * @author   ChatRoom Laravel
 *
 * @version  1.0.0
 */

namespace App\Http\Controllers;

use App\Events\MessageSent;
use App\Events\UserJoined;
use App\Events\UserLeft;
use App\Http\Requests\SendMessageRequest;
use App\Jobs\SaveMessageJob;
use App\Models\Room;
use App\Services\ChatStateService;
use App\Services\MessageFilterService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\View\View;

class ChatController extends Controller
{
    public function __construct(
        private readonly ChatStateService $chatState,
        private readonly MessageFilterService $filter,
    ) {}

    /**
     * 进入房间初始化 (等同于原版 INIT.ASP)
     *
     * @param  int  $id  房间ID
     * @return View|JsonResponse
     */
    public function init(int $id)
    {
        $room = Room::findOrFail($id);
        $user = Auth::user();

        // 1. 将当前用户加入到 Redis 房间在线列表
        $this->chatState->userJoin($id, $user->username, [
            'level' => $user->user_level,
            'sex' => $user->sex,
            'headface' => $user->headface,
        ]);

        // 2. 广播 UserJoined 事件，通知房间内的其他人
        broadcast(new UserJoined($id, $user->username, [
            'level' => $user->user_level,
            'sex' => $user->sex,
            'headface' => $user->headface,
        ]))->toOthers();

        // 3. 获取历史消息用于初次渲染
        // TODO: 可在前端通过请求另外的接口拉取历史记录，或者直接在这里 attach

        // 渲染主聊天框架视图
        return view('chat.frame', [
            'room' => $room,
            'user' => $user,
        ]);
    }

    /**
     * 发送消息 (等同于原版 NEWSAY.ASP)
     *
     * @param  int  $id  房间ID
     */
    public function send(SendMessageRequest $request, int $id): JsonResponse
    {
        $data = $request->validated();
        $user = Auth::user();

        // 1. 过滤净化消息体
        $pureContent = $this->filter->filter($data['content'] ?? '');
        if (empty($pureContent)) {
            return response()->json(['status' => 'error', 'message' => '消息内容不能为空或不合法。'], 422);
        }

        // 2. 封装消息对象
        $messageData = [
            'id' => $this->chatState->nextMessageId($id), // 分布式安全自增序号
            'room_id' => $id,
            'from_user' => $user->username,
            'to_user' => $data['to_user'] ?? '大家',
            'content' => $pureContent,
            'is_secret' => $data['is_secret'] ?? false,
            'font_color' => $data['font_color'] ?? '',
            'action' => $data['action'] ?? '',
            'sent_at' => now()->toDateTimeString(),
        ];

        // 3. 压入 Redis 缓存列表 (防炸内存，只保留最近 N 条)
        $this->chatState->pushMessage($id, $messageData);

        // 4. 立刻向 WebSocket 发射广播，前端达到 0 延迟渲染
        broadcast(new MessageSent($id, $messageData));

        // 5. 丢进异步列队，慢慢持久化到 MySQL，保护数据库连接池
        SaveMessageJob::dispatch($messageData);

        return response()->json(['status' => 'success']);
    }

    /**
     * 自动挂机存点心跳与经验升级 (新增)
     * 替代原版定时 iframe 刷新的 save.asp。
     *
     * @param  int  $id  房间ID
     */
    public function heartbeat(Request $request, int $id): JsonResponse
    {
        $user = Auth::user();
        if (! $user) {
            return response()->json(['status' => 'error'], 401);
        }

        // 1. 每次心跳 +1 点经验
        $user->exp_num += 1;

        // 2. 检查等级计算：设定简单粗暴的平滑算式：需要经验=等级*等级*10
        // 例如：0级->0点；1级->10点；2级->40点；3级->90点；10级->1000点
        $currentLevel = $user->user_level;
        $requiredExpForNextLevel = ($currentLevel) * ($currentLevel) * 10;

        $leveledUp = false;

        if ($user->exp_num >= $requiredExpForNextLevel) {
            $user->user_level += 1;
            $leveledUp = true;
        }

        $user->save(); // 存点入库

        // 3. 将新的等级反馈给当前用户的在线名单上
        // 确保刚刚升级后别人查看到的也是最准确等级
        $this->chatState->userJoin($id, $user->username, [
            'level' => $user->user_level,
            'sex' => $user->sex,
            'headface' => $user->headface,
        ]);

        // 4. 如果突破境界，向全房系统喊话广播！
        if ($leveledUp) {
            // 生成炫酷广播消息发向该频道
            $sysMsg = [
                'id' => $this->chatState->nextMessageId($id),
                'room_id' => $id,
                'from_user' => '系统传音',
                'to_user' => '大家',
                'content' => "🌟 天道酬勤！恭喜侠客【{$user->username}】挂机苦修，境界突破至 LV.{$user->user_level}！",
                'is_secret' => false,
                'font_color' => '#d97706', // 琥珀橙色
                'action' => '大声宣告',
                'sent_at' => now()->toDateTimeString(),
            ];

            $this->chatState->pushMessage($id, $sysMsg);
            broadcast(new MessageSent($id, $sysMsg));

            // 落库
            SaveMessageJob::dispatch($sysMsg);
        }

        return response()->json([
            'status' => 'success',
            'data' => [
                'exp_num' => $user->exp_num,
                'user_level' => $user->user_level,
                'leveled_up' => $leveledUp,
            ],
        ]);
    }

    /**
     * 离开房间 (等同于原版 LEAVE.ASP)
     *
     * @param  int  $id  房间ID
     */
    public function leave(Request $request, int $id): JsonResponse
    {
        $user = Auth::user();
        if (! $user) {
            return response()->json(['status' => 'error'], 401);
        }

        // 1. 从 Redis 删除该用户
        $this->chatState->userLeave($id, $user->username);

        // 2. 广播通知他人
        broadcast(new UserLeft($id, $user->username))->toOthers();

        return response()->json(['status' => 'success']);
    }
}