<?php
namespace App\Http\Controllers\Child;
use App\Http\Controllers\Controller;
use App\Models\Subject;
use App\Models\Question;
use App\Models\QuestionAttempt;
use Illuminate\Http\Request;
class LearnController extends Controller {
    public function subjects() {
        $user = auth()->user();
        $subjects = Subject::all()->map(function($s) use ($user) {
            $s->correct = QuestionAttempt::whereHas('question', fn($q) => $q->where('subject_id',$s->id))
                ->where('user_id',$user->id)->where('is_correct',true)->count();
            $s->total = $s->questions()->where('active',true)->count();
            return $s;
        });
        return view('child.learn.subjects', compact('subjects'));
    }
    public function quiz(Subject $subject) {
        $user = auth()->user();
        // Bevorzuge Fragen die heute noch nicht beantwortet wurden
        $answeredToday = QuestionAttempt::where('user_id',$user->id)
            ->whereDate('created_at', today())
            ->pluck('question_id');
        $question = $subject->activeQuestions()
            ->whereNotIn('id', $answeredToday)
            ->with('answerOptions')
            ->inRandomOrder()
            ->first();
        // Falls alle beantwortet: ganz random
        if (!$question) {
            $question = $subject->activeQuestions()->with('answerOptions')->inRandomOrder()->first();
        }
        if (!$question) {
            return redirect()->route('learn.subjects')->with('info','Noch keine Fragen für dieses Fach.');
        }
        // Optionen mischen
        $question->answerOptions = $question->answerOptions->shuffle();
        return view('child.learn.quiz', compact('subject','question'));
    }
    public function answer(Request $r, Subject $subject) {
        $r->validate(['question_id'=>'required|exists:questions,id','answer'=>'required']);
        $user     = auth()->user();
        $question = Question::with('answerOptions')->findOrFail($r->question_id);
        $correct  = $question->answerOptions->where('is_correct',true)->first();
        $isRight  = (string)$r->answer === (string)$correct->id;
        $earned   = 0;
        if ($isRight) {
            $earned = $question->points_value;
            // Streak-Bonus: 3+ in Folge = +5
            $streak = $user->currentStreak();
            if ($streak >= 2) $earned += 5;
            $user->increment('points', $earned);
        }
        QuestionAttempt::create([
            'user_id'     => $user->id,
            'question_id' => $question->id,
            'is_correct'  => $isRight,
            'points_earned'=> $earned,
        ]);
        $newStreak = $user->fresh()->currentStreak();
        return view('child.learn.result', compact('subject','question','correct','isRight','earned','newStreak'));
    }
}