<?php

/**
 * 文件功能：聊天机器人控制器
 *
 * 处理用户与 AI 机器人的对话请求。
 * 先检查全局开关（sysparam: chatbot_enabled），再调用 AiChatService 获取回复。
 *
 * @author   ChatRoom Laravel
 *
 * @version  1.0.0
 */

namespace App\Http\Controllers;

use App\Events\MessageSent;
use App\Jobs\SaveMessageJob;
use App\Models\Sysparam;
use App\Services\AiChatService;
use App\Services\ChatStateService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class ChatBotController extends Controller
{
    /**
     * 构造函数：注入 AI 聊天服务和聊天状态服务
     */
    public function __construct(
        private readonly AiChatService $aiChat,
        private readonly ChatStateService $chatState,
    ) {}

    /**
     * 与 AI 机器人对话
     *
     * 接收用户消息，检查全局开关后调用 AI 服务获取回复。
     * 支持自动故障转移：默认厂商失败时自动尝试备用厂商。
     *
     * @param  Request  $request  请求对象，需包含 message 和 room_id
     * @return JsonResponse 机器人回复或错误信息
     */
    public function chat(Request $request): JsonResponse
    {
        // 验证请求参数
        $request->validate([
            'message' => 'required|string|max:2000',
            'room_id' => 'required|integer',
        ]);

        // 检查全局开关
        $enabled = Sysparam::getValue('chatbot_enabled', '0');
        if ($enabled !== '1') {
            return response()->json([
                'status' => 'error',
                'message' => 'AI 机器人功能已关闭，请联系管理员开启。',
            ], 403);
        }

        $user = Auth::user();
        $message = $request->input('message');
        $roomId = $request->input('room_id');

        try {
            // 先广播用户的提问消息
            $userMsg = [
                'id' => $this->chatState->nextMessageId($roomId),
                'room_id' => $roomId,
                'from_user' => $user->username,
                'to_user' => 'AI小班长',
                'content' => $message,
                'is_secret' => false,
                'font_color' => '#000000',
                'action' => '',
                'sent_at' => now()->toDateTimeString(),
            ];
            $this->chatState->pushMessage($roomId, $userMsg);
            broadcast(new MessageSent($roomId, $userMsg));
            SaveMessageJob::dispatch($userMsg);

            $result = $this->aiChat->chat($user->id, $message, $roomId);

            // 广播 AI 回复消息
            $botMsg = [
                'id' => $this->chatState->nextMessageId($roomId),
                'room_id' => $roomId,
                'from_user' => 'AI小班长',
                'to_user' => $user->username,
                'content' => $result['reply'],
                'is_secret' => false,
                'font_color' => '#16a34a',
                'action' => '',
                'sent_at' => now()->toDateTimeString(),
            ];
            $this->chatState->pushMessage($roomId, $botMsg);
            broadcast(new MessageSent($roomId, $botMsg));
            SaveMessageJob::dispatch($botMsg);

            return response()->json([
                'status' => 'success',
                'reply' => $result['reply'],
                'provider' => $result['provider'],
                'model' => $result['model'],
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'status' => 'error',
                'message' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 清除当前用户的 AI 对话上下文
     *
     * 用于用户想要重新开始对话时使用。
     *
     * @param  Request  $request  请求对象
     * @return JsonResponse 操作结果
     */
    public function clearContext(Request $request): JsonResponse
    {
        $user = Auth::user();
        $this->aiChat->clearContext($user->id);

        return response()->json([
            'status' => 'success',
            'message' => '对话上下文已清除，可以开始新的对话了。',
        ]);
    }
}