<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Models\Attempt;
use App\Models\Answer;
use App\Models\Quiz;
use App\Models\Option;
use App\Models\AdminLog;
use Illuminate\Support\Facades\DB;
use Inertia\Inertia;

class AttemptController extends Controller
{
    public function destroy(Attempt $attempt)
    {
        $this->authorizeAdmin();

        $candidateName = $attempt->candidate->user->name;
        $quizTitle = $attempt->quiz->title;

        DB::transaction(function () use ($attempt, $candidateName, $quizTitle) {
            // Log the action
            AdminLog::create([
                'user_id' => auth()->id(),
                'action' => 'DELETE_ATTEMPT',
                'description' => "Suppression du test '{$quizTitle}' pour le candidat '{$candidateName}'."
            ]);

            // Delete attempt (cascades to answers)
            $attempt->delete();

            // Re-evaluate candidate status if needed
            $candidate = $attempt->candidate;
            if ($candidate->attempts()->count() === 0) {
                $candidate->update(['status' => 'en_attente']);
            }
        });

        return back()->with('success', 'Tentative de test supprimée et action journalisée.');
    }

    private function authorizeAdmin()
    {
        if (!auth()->user()->isAdmin()) {
            abort(403);
        }
    }
    public function show(int $quizId)
    {
        // Bypass tenant global scope: candidates have no tenant_id
        // but should still access their assigned quizzes
        $quiz = Quiz::withoutGlobalScopes()->findOrFail($quizId);

        $candidate = auth()->user()->candidate;

        if (!$candidate) {
            abort(403, 'Seuls les candidats peuvent passer des quiz.');
        }
        
        $attempt = Attempt::where('candidate_id', $candidate->id)
            ->where('quiz_id', $quiz->id)
            ->first();

        if ($attempt && $attempt->finished_at) {
            return Inertia::render('Candidate/Thanks');
        }

        if (!$attempt) {
            $attempt = Attempt::create([
                'candidate_id' => $candidate->id,
                'quiz_id' => $quiz->id,
                'started_at' => now(),
            ]);

            $candidate->update(['status' => 'en_cours']);
        }

        $quiz->load(['questions.options']);

        return Inertia::render('Candidate/QuizInterface', [
            'quiz' => $quiz,
            'attempt' => $attempt->load('answers')
        ]);
    }

    public function saveAnswer(Request $request, Attempt $attempt)
    {
        $request->validate([
            'question_id' => 'required|exists:questions,id',
            'option_id' => 'nullable|exists:options,id',
            'text_content' => 'nullable|string',
        ]);

        Answer::updateOrCreate(
            [
                'attempt_id' => $attempt->id,
                'question_id' => $request->question_id,
            ],
            [
                'option_id' => $request->option_id,
                'text_content' => $request->text_content,
            ]
        );

        return response()->json(['status' => 'success']);
    }

    public function finish(Attempt $attempt)
    {
        if ($attempt->finished_at) {
            return redirect()->route('dashboard');
        }

        $this->recalculateScore($attempt);

        $attempt->update([
            'finished_at' => now(),
        ]);

        $attempt->candidate->update(['status' => 'termine']);

        return redirect()->route('dashboard');
    }

    public function updateAnswerScore(Request $request, Answer $answer)
    {
        $this->authorizeAdmin();

        $request->validate([
            'score' => 'required|numeric|min:0'
        ]);

        $answer->update(['score' => $request->score]);

        $this->recalculateScore($answer->attempt);

        return back()->with('success', 'Note mise à jour et score total recalculé.');
    }

    private function recalculateScore(Attempt $attempt)
    {
        // Bypass tenant scope: candidates have no tenant_id
        $quiz = Quiz::withoutGlobalScopes()
            ->with(['questions.options'])
            ->find($attempt->quiz_id);

        $attempt->load(['answers.option']);
        
        $score = 0;
        $maxScore = 0;

        if (!$quiz) {
            return;
        }

        foreach ($quiz->questions as $question) {
            $maxScore += $question->points;
            $userAnswer = $attempt->answers->where('question_id', $question->id)->first();
            
            if ($userAnswer) {
                if ($question->type === 'qcm') {
                    if ($userAnswer->option && $userAnswer->option->is_correct) {
                        $score += $question->points;
                    }
                } else if ($question->type === 'open') {
                    $score += (float) $userAnswer->score;
                }
            }
        }

        $attempt->update([
            'score' => $score,
            'max_score' => $maxScore,
        ]);
    }
}