ars-backend/app/Http/Controllers/ChatSessionController.php

<?php

namespace App\Http\Controllers;

use App\Exceptions\ChatSessionStatusException;
use App\Http\Requests\AppendMessageRequest;
use App\Http\Requests\CreateSessionRequest;
use App\Http\Requests\UpdateSessionRequest;
use App\Http\Resources\ChatSessionResource;
use App\Http\Resources\MessageResource;
use App\Services\ChatService;
use App\Services\RunDispatcher;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class ChatSessionController extends Controller
{
    public function __construct(
        private readonly ChatService $service,
        private readonly RunDispatcher $runDispatcher,
    )
    {
    }

    /**
     * 存储新的会话。
     *
     * @param CreateSessionRequest $request 包含会话信息的请求实例。
     * @return JsonResponse 返回包含新创建会话信息的 JSON 响应，状态码为 201。
     */
    public function store(CreateSessionRequest $request): JsonResponse
    {
        $session = $this->service->createSession($request->input('session_name'));

        return (new ChatSessionResource($session))->response()->setStatusCode(201);
    }

    /**
     * 追加一条消息。
     *
     * @param string $sessionId 会话 ID。
     * @param AppendMessageRequest $request 追加消息的请求实例。
     * @return JsonResponse 添加消息的响应，包含添加的消息信息。
     */
    public function append(string $sessionId, AppendMessageRequest $request): JsonResponse
    {
        try {
            $message = $this->service->appendMessage([
                'session_id' => $sessionId,
                ...$request->validated(),
            ]);

            if ($message->role === 'USER' && $message->type === 'user.prompt') {
                $this->runDispatcher->dispatchForPrompt($sessionId, $message->message_id);
            }
        } catch (ChatSessionStatusException $e) {
            return response()->json(['message' => $e->getMessage()], 403);
        }

        return (new MessageResource($message))->response()->setStatusCode(201);
    }

    /**
     * 获取指定会话的消息列表。
     *
     * @param Request $request 包含查询参数的请求实例，其中包括 after_seq 和 limit。
     * @param string $sessionId 会话的唯一标识符。
     * @return JsonResponse 返回包含消息列表的 JSON 响应。
     */
    public function listMessages(Request $request, string $sessionId): JsonResponse
    {
        $afterSeq = (int) $request->query('after_seq', 0);
        $limit = (int) $request->query('limit', 50);
        $limit = $limit > 0 && $limit <= 200 ? $limit : 50;

        $messages = $this->service->listMessagesBySeq($sessionId, $afterSeq, $limit);

        return MessageResource::collection($messages)->response();
    }

    public function showMessage(string $sessionId, string $messageId): JsonResponse
    {
        $message = $this->service->getMessage($sessionId, $messageId);

        if (! $message) {
            abort(404);
        }

        return (new MessageResource($message))->response();
    }

    /**
     * 获取会话列表。
     *
     * @param Request $request 获取会话列表的请求实例。
     * @return JsonResponse 获取的会话列表的 JSON 响应。
     */
    public function index(Request $request): JsonResponse
    {
        $page = (int) $request->query('page', 1);
        $perPage = (int) $request->query('per_page', 15);
        $perPage = $perPage > 0 && $perPage <= 100 ? $perPage : 15;

        $filter = [
            'status' => $request->query('status'),
            'q' => $request->query('q'),
        ];

        $paginator = $this->service->listSessions($filter, $page, $perPage);

        return ChatSessionResource::collection($paginator)->response();
    }

    /**
     * 更新会话。
     *
     * @param string $sessionId 会话的唯一标识符。
     * @param UpdateSessionRequest $request 更新会话的请求实例。
     * @return JsonResponse 更新后的会话的 JSON 响应。
     */
    public function update(string $sessionId, UpdateSessionRequest $request): JsonResponse
    {
        try {
            $session = $this->service->updateSession($sessionId, $request->validated());
        } catch (ChatSessionStatusException $e) {
            return response()->json(['message' => $e->getMessage()], 403);
        }

        return (new ChatSessionResource($session))->response();
    }

    public function show(string $sessionId): JsonResponse
    {
        $session = $this->service->getSessionWithLastMessage($sessionId);

        return (new ChatSessionResource($session))->response();
    }

    public function archive(string $sessionId): JsonResponse
    {
        $session = $this->service->archiveSession($sessionId);

        return (new ChatSessionResource($session))->response();
    }
}