<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Chat;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;

class ChatHistoryController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index(Chat $chat)
    {
        return $this->success(
            $chat->histories()->get()
        );
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request, Chat $chat)
    {
        // 获取上一条记录
        $last_history = $chat->histories()->orderBy('id', 'desc')->first();

        // 如果存在
        if ($last_history) {
            // 如果上一条是 user
            if ($last_history->role == 'user') {
                // 不允许发送消息
                return $this->badRequest('你已经回复过了，请等待 AI 响应。');
            }

            // 检查缓存是否存在
            $last_stream_key = 'chat_history_id:'.$last_history->id;

            // 如果存在
            if (Cache::has($last_stream_key)) {
                return $this->conflict('上一个流信息还没有获取，请等待一分钟后重试。');
            }
        }

        $request->validate([
            'message' => 'required',
        ]);

        $chat->histories()->create([
            'content' => $request->input('message'),
            'role' => 'user',
        ]);

        $random_id = Str::random(20);

        $last_stream_key = 'chat_history_id:'.$last_history->id;
        // 设置缓存
        Cache::put($last_stream_key, $random_id, 60);
        Cache::put("chat_history_stream_id:$random_id", $last_history->id, 60);

        return $this->success([
            'stream_url' => route('chat-stream', $random_id),
        ]);
    }

    public function stream(string $stream_id)
    {
        return $stream_id;
    }
}