<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Models\Department;
use App\Models\Position;
use App\Models\Subject; // PASTIKAN SUBJECT DI-IMPORT
use App\Models\User;
use App\Models\QuestionBank;

class ExamManagementController extends Controller
{
    public function questionBank(Request $request)
    {
        $departments = Department::orderBy('name', 'asc')->get();
        $positions   = Position::orderBy('name', 'asc')->get();
        $subjects    = Subject::orderBy('name', 'asc')->get(); // Mengambil data Subject
        
        $creators = User::whereHas('roles', function($q){
            $q->whereIn('name', ['admin', 'trainer']);
        })->orderBy('first_name', 'asc')->get();

        // Load relasi subject, department, position, dan creator
        $query = QuestionBank::with(['subject', 'department', 'position', 'creator']);

        // Logika Filter
        if ($request->filled('search')) {
            $query->where('question_text', 'like', '%' . $request->search . '%');
        }
        if ($request->filled('department_id')) {
            $query->where('department_id', $request->department_id);
        }
        if ($request->filled('position_id')) {
            $query->where('position_id', $request->position_id);
        }
        if ($request->filled('subject_id')) { // Filter berdasarkan Subject
            $query->where('subject_id', $request->subject_id);
        }
        if ($request->filled('question_type')) {
            $query->where('question_type', $request->question_type);
        }
        if ($request->filled('question_level')) {
            $query->where('question_level', $request->question_level);
        }
        if ($request->filled('created_by')) {
            $query->where('created_by', $request->created_by);
        }

        $questions = $query->latest()->paginate(15)->withQueryString();
        $totalQuestions = $questions->total();

        return view('pages.admin.exams.question-bank', compact(
            'questions', 'totalQuestions', 'departments', 'positions', 'subjects', 'creators'
        ));
    }

    // Fungsi untuk menampilkan halaman Tambah Soal
    public function create()
    {
        $departments = Department::orderBy('name', 'asc')->get();
        $positions   = Position::orderBy('name', 'asc')->get();
        $subjects    = Subject::orderBy('name', 'asc')->get(); // Kirim Subject ke form

        return view('pages.admin.exams.create', compact('departments', 'positions', 'subjects'));
    }

    // Fungsi untuk menampilkan halaman Edit Soal
    public function edit($id)
    {
        $question    = QuestionBank::findOrFail($id);
        $departments = Department::orderBy('name', 'asc')->get();
        $positions   = Position::orderBy('name', 'asc')->get();
        $subjects    = Subject::orderBy('name', 'asc')->get(); // Kirim Subject ke form

        return view('pages.admin.exams.edit', compact('question', 'departments', 'positions', 'subjects'));
    }

    // Fungsi Show untuk Detail Soal
    public function show($id)
    {
        $question = QuestionBank::with(['subject', 'department', 'position', 'creator'])->findOrFail($id);
        return view('pages.admin.exams.show', compact('question'));
    }

    /**
     * Menghapus banyak soal sekaligus (Bulk Delete)
     */
    public function bulkDelete(Request $request)
    {
        $request->validate([
            'question_ids'   => 'required|array',
            'question_ids.*' => 'exists:questions,id'
        ]);

        try {
            Question::whereIn('id', $request->question_ids)->delete();
            return back()->with('success', count($request->question_ids) . ' Soal berhasil dihapus secara massal.');
        } catch (\Exception $e) {
            return back()->with('error', 'Gagal menghapus soal: ' . $e->getMessage());
        }
    }

    /**
     * Menampilkan Halaman Import Soal
     */
    public function importView()
    {
        return view('pages.admin.exams.questions.import');
    }
}