<?php

declare(strict_types=1);

namespace App\Http\Controllers\Tutorial;

use App\Http\Controllers\Controller;
use App\Models\TutorialLesson;
use App\Models\TutorialQuestion;
use App\Models\TutorialUserProgress;
use App\Services\TutorialService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\View\View;
use Barryvdh\DomPDF\Facade\Pdf;

class TutorialController extends Controller
{
    public function __construct(
        private readonly TutorialService $tutorialService
    ) {}

    public function index(): View
    {
        $lessons = TutorialLesson::orderBy('order')->get();
        $progress = TutorialUserProgress::where('user_id', Auth::id())->first();

        return view('tutorial.index', compact('lessons', 'progress'));
    }

    public function lesson(int $id): View
    {
        $lesson = TutorialLesson::findOrFail($id);
        $lessons = TutorialLesson::orderBy('order')->get();
        $progress = TutorialUserProgress::where('user_id', Auth::id())->first();

        $completedLessons = $progress?->completed_lessons ?? [];
        if (!in_array($id, $completedLessons)) {
            $completedLessons[] = $id;
            if (!$progress) {
                $progress = TutorialUserProgress::create(['user_id' => Auth::id(), 'completed_lessons' => $completedLessons]);
            } else {
                $progress->update(['completed_lessons' => $completedLessons]);
            }
        }

        return view('tutorial.lesson', compact('lesson', 'lessons', 'progress'));
    }

    public function quiz(): View
    {
        $questions = TutorialQuestion::orderBy('order')->get();
        $progress = TutorialUserProgress::where('user_id', Auth::id())->first();

        return view('tutorial.quiz', compact('questions', 'progress'));
    }

    public function submitQuiz(Request $request): View
    {
        $request->validate([
            'answers' => 'required|array',
            'answers.*' => 'required|string',
        ]);

        $questions = TutorialQuestion::orderBy('order')->get();
        $score = 0;
        $answers = $request->input('answers', []);
        $results = [];

        foreach ($questions as $question) {
            $isCorrect = isset($answers[$question->id]) && $answers[$question->id] === $question->correct_answer;
            if ($isCorrect) {
                $score++;
            }
            $results[] = [
                'question' => $question->question,
                'your_answer' => $answers[$question->id] ?? null,
                'correct_answer' => $question->correct_answer,
                'is_correct' => $isCorrect,
                'explanation' => $question->explanation,
            ];
        }

        $passed = $score >= 6;

        $progress = TutorialUserProgress::where('user_id', Auth::id())->first();
        if (!$progress) {
            $progress = TutorialUserProgress::create(['user_id' => Auth::id()]);
        }

        $progress->update([
            'quiz_answers' => $answers,
            'quiz_score' => $score,
            'quiz_passed' => $passed,
            'quiz_completed_at' => now(),
        ]);

        return view('tutorial.result', compact('score', 'results', 'passed', 'progress'));
    }

    public function certificate(): \Illuminate\Http\Response
    {
        $user = Auth::user();
        $progress = TutorialUserProgress::where('user_id', $user->id)->firstOrFail();

        if (!$progress->quiz_passed) {
            return redirect()->route('tutorial.quiz')->with('error', 'Você precisa passar no quiz para gerar o certificado.');
        }

        $progress->update(['certificate_generated_at' => now()]);

        $pdf = Pdf::loadView('tutorial.certificate', compact('user', 'progress'));
        $pdf->setPaper('a4', 'landscape');

        return $pdf->download('certificado-engenharia-prompt-gprompt.pdf');
    }
}