<?php
namespace App\Http\Controllers\Admin;
use App\Http\Controllers\Controller;
use App\Models\Question;
use App\Models\Subject;
use App\Models\AnswerOption;
use Illuminate\Http\Request;
class QuestionController extends Controller {
    public function index(Request $r) {
        $subjects  = Subject::all();
        $query     = Question::with('subject')->latest();
        if ($r->filled('subject')) $query->where('subject_id', $r->subject);
        $questions = $query->paginate(20)->withQueryString();
        return view('admin.questions.index', compact('questions','subjects'));
    }
    public function create() {
        $subjects = Subject::all();
        return view('admin.questions.create', compact('subjects'));
    }
    public function store(Request $r) {
        $r->validate([
            'subject_id'    => 'required|exists:subjects,id',
            'question_text' => 'required|string',
            'type'          => 'required|in:multiple_choice,number_input',
            'difficulty'    => 'required|in:1,2,3',
            'options'       => 'required_if:type,multiple_choice|array|min:2',
            'options.*'     => 'required|string',
            'correct'       => 'required_if:type,multiple_choice|integer',
            'number_answer' => 'required_if:type,number_input',
        ]);
        $pts = [1=>5, 2=>10, 3=>20][$r->difficulty];
        $q = Question::create([
            'subject_id'    => $r->subject_id,
            'question_text' => $r->question_text,
            'type'          => $r->type,
            'difficulty'    => $r->difficulty,
            'points_value'  => $pts,
            'active'        => true,
        ]);
        if ($r->type === 'multiple_choice') {
            foreach ($r->options as $i => $text) {
                if (trim($text) === '') continue;
                AnswerOption::create([
                    'question_id' => $q->id,
                    'text'        => $text,
                    'is_correct'  => ($i == $r->correct),
                    'sort_order'  => $i,
                ]);
            }
        } else {
            AnswerOption::create([
                'question_id' => $q->id,
                'text'        => $r->number_answer,
                'is_correct'  => true,
                'sort_order'  => 0,
            ]);
        }
        return redirect()->route('admin.questions.index')->with('success','Frage gespeichert.');
    }
    public function edit(Question $question) {
        $subjects = Subject::all();
        $question->load('answerOptions');
        return view('admin.questions.edit', compact('question','subjects'));
    }
    public function update(Request $r, Question $question) {
        $r->validate([
            'subject_id'    => 'required|exists:subjects,id',
            'question_text' => 'required|string',
            'difficulty'    => 'required|in:1,2,3',
            'options'       => 'array',
            'options.*'     => 'string',
            'correct'       => 'integer',
        ]);
        $pts = [1=>5, 2=>10, 3=>20][$r->difficulty];
        $question->update([
            'subject_id'    => $r->subject_id,
            'question_text' => $r->question_text,
            'difficulty'    => $r->difficulty,
            'points_value'  => $pts,
            'active'        => $r->boolean('active', true),
        ]);
        if ($r->filled('options')) {
            $question->answerOptions()->delete();
            foreach ($r->options as $i => $text) {
                if (trim($text) === '') continue;
                AnswerOption::create([
                    'question_id' => $question->id,
                    'text'        => $text,
                    'is_correct'  => ($i == $r->correct),
                    'sort_order'  => $i,
                ]);
            }
        }
        return redirect()->route('admin.questions.index')->with('success','Gespeichert.');
    }
    public function destroy(Question $question) {
        $question->delete();
        return redirect()->route('admin.questions.index')->with('success','Frage gelöscht.');
    }
}