<?php
namespace App\Http\Controllers\Admin;
use App\Http\Controllers\Controller;
use App\Models\{Quiz, QuizQuestion, QuizAnswerOption};
use Illuminate\Http\Request;

class QuizQuestionController extends Controller {

    public function create(Quiz $quiz) {
        return view('admin.quiz_questions.create', compact('quiz'));
    }

    public function store(Request $r, Quiz $quiz) {
        $r->validate([
            'type'           => 'required|in:multiple_choice,exclusion,true_false,free_text',
            'question_text'  => 'required|string',
            'time_limit'     => 'nullable|integer|min:5|max:120',
            'correct_answer' => 'nullable|string|max:200',
            'correct_option' => 'nullable|integer|min:0|max:3',
            'options'        => 'array',
            'options.*.text' => 'nullable|string|max:200',
        ]);
        $q = QuizQuestion::create([
            'quiz_id'        => $quiz->id,
            'sort_order'     => ($quiz->questions()->max('sort_order') ?? -1) + 1,
            'type'           => $r->type,
            'question_text'  => $r->question_text,
            'time_limit'     => $r->time_limit ?: null,
            'correct_answer' => $r->correct_answer,
        ]);
        if (in_array($r->type,['multiple_choice','exclusion'])) {
            $correctIdx = (int)$r->input('correct_option', 0);
            foreach (($r->options ?? []) as $i => $opt) {
                if (!empty($opt['text'])) {
                    QuizAnswerOption::create([
                        'quiz_question_id' => $q->id,
                        'text'       => $opt['text'],
                        'is_correct' => $i === $correctIdx,
                        'sort_order' => $i,
                    ]);
                }
            }
        }
        return redirect()->route('admin.quizzes.edit', $quiz)->with('success','Frage hinzugefügt.');
    }

    public function edit(QuizQuestion $question) {
        return view('admin.quiz_questions.edit', compact('question'));
    }

    public function update(Request $r, QuizQuestion $question) {
        $r->validate([
            'type'           => 'required|in:multiple_choice,exclusion,true_false,free_text',
            'question_text'  => 'required|string',
            'time_limit'     => 'nullable|integer|min:5|max:120',
            'correct_answer' => 'nullable|string|max:200',
            'correct_option' => 'nullable|integer|min:0|max:3',
            'options'        => 'array',
            'options.*.text' => 'nullable|string|max:200',
        ]);
        $question->update([
            'type'           => $r->type,
            'question_text'  => $r->question_text,
            'time_limit'     => $r->time_limit ?: null,
            'correct_answer' => $r->correct_answer,
        ]);
        if (in_array($r->type,['multiple_choice','exclusion'])) {
            $question->answerOptions()->delete();
            $correctIdx = (int)$r->input('correct_option', 0);
            foreach (($r->options ?? []) as $i => $opt) {
                if (!empty($opt['text'])) {
                    QuizAnswerOption::create([
                        'quiz_question_id' => $question->id,
                        'text'       => $opt['text'],
                        'is_correct' => $i === $correctIdx,
                        'sort_order' => $i,
                    ]);
                }
            }
        }
        return redirect()->route('admin.quizzes.edit', $question->quiz)->with('success','Frage gespeichert.');
    }

    public function destroy(QuizQuestion $question) {
        $quiz = $question->quiz;
        $question->delete();
        return redirect()->route('admin.quizzes.edit', $quiz)->with('success','Frage gelöscht.');
    }
}