<?php

namespace App\Http\Controllers;

use App\Exceptions\ChatSessionStatusException;
use App\Http\Requests\AppendMessageRequest;
use App\Http\Requests\CreateSessionRequest;
use App\Http\Resources\MessageResource;
use App\Models\Message;
use App\Services\ChatService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

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

    public function store(CreateSessionRequest $request): JsonResponse
    {
        $session = $this->service->createSession($request->input('session_name'));

        return response()->json($session, 201);
    }

    public function append(string $sessionId, AppendMessageRequest $request): JsonResponse
    {
        try {
            $message = $this->service->appendMessage([
                'session_id' => $sessionId,
                ...$request->validated(),
            ]);
        } catch (ChatSessionStatusException $e) {
            return response()->json(['message' => $e->getMessage()], 403);
        }

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

    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();
    }
}