<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Requests\CreateExerciseRequest;
use App\Services\ExerciseService;
use App\Services\ExerciseSkillService;
use App\Services\QuestionService;
use App\Services\SkillService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class ExerciseController extends Controller
{
    public function __construct(
        ExerciseService $exerciseService,
        ExerciseSkillService $exerciseSkillService,
        SkillService $skillService,
        QuestionService $questionService,
    )
    {
        $this->exerciseService = $exerciseService;
        $this->skillService = $skillService;
        $this->exerciseSkillService = $exerciseSkillService;
        $this->questionService = $questionService;
    }

    public function index(Request $request)
    {
        $exercises = $this->exerciseService->getExercises($request->all());

        if ($exercises->isEmpty()) {
            return response()->json([
                'status' => true,
                'data' => $exercises,
                'message' => 'Không có dữ liệu.',
            ]);
        }

        return response()->json([
            'status' => true,
            'data' => $exercises,
            'message' => 'Lấy danh sách đề thi thành công.',
        ]);
    }

    public function create(CreateExerciseRequest $request)
    {
        DB::beginTransaction();
        try {
            $data = $request->all();
            $groups = json_decode($data['groups']);
            $dataExercises = $request->except('groups','skill');
            $dataSkills = $data['skill'];

            $exerciseId = $this->exerciseService->createExercise($dataExercises);
            $skillIds = $this->skillService->getSkillIds($dataSkills);
            $this->exerciseSkillService->handleSkillsForExercise($skillIds, $exerciseId);
            $this->questionService->createQuestion($groups, $exerciseId);

            DB::commit();

            return response()->json([
                'success' => true,
                'message' => 'Tạo đề thi thành công.',
                'exercise_id' => $exerciseId
            ], 201);
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'success' => false,
                'message' => 'Tạo đề thi thất bại.',
                'error' => $e->getMessage()
            ], 500);
        }
    }
}