<?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; 
use App\Models\User;
use App\Models\QuestionBank;

class ExamManagementController extends Controller
{
   public function questionBank(Request $request)
    {
        // 1. Ambil ID unik siapa saja yang PERNAH membuat soal di tabel question_banks
        $creatorIds = \App\Models\QuestionBank::whereNotNull('created_by')
                                ->distinct()
                                ->pluck('created_by');

        // 2. Tarik data User HANYA berdasarkan ID pembuat soal tersebut
        $creators = \App\Models\User::whereIn('id', $creatorIds)
                        ->orderBy('first_name', 'asc')
                        ->get();

        // 3. Tarik data pendukung lainnya untuk filter & dropdown
        $subjects = \App\Models\Subject::orderBy('name', 'asc')->get();
        $departments = \App\Models\Department::orderBy('name', 'asc')->get();
        $positions = \App\Models\Position::orderBy('name', 'asc')->get(); 

        // 4. Hitung Total Soal Keseluruhan (TANPA FILTER) untuk Badge di View
        $totalQuestions = \App\Models\QuestionBank::count(); // <--- TAMBAHKAN BARIS INI

        // 5. Query utama Bank Soal (dengan fitur pencarian/filter)
        $query = \App\Models\QuestionBank::with(['subject', 'department', 'creator', 'position']);

        // Filter berdasarkan pembuat soal
        if ($request->filled('creator_id')) {
            $query->where('created_by', $request->creator_id);
        }
        
        // Filter berdasarkan subject/materi
        if ($request->filled('subject_id')) {
            $query->where('subject_id', $request->subject_id);
        }

        // Filter berdasarkan departemen
        if ($request->filled('department_id')) {
            $query->where('department_id', $request->department_id);
        }

        // Filter berdasarkan posisi/jabatan
        if ($request->filled('position_id')) {
            $query->where('position_id', $request->position_id);
        }

        // Pagination
        $questions = $query->latest()->paginate(20);

        // Pastikan $totalQuestions ikut dikirim ke compact
        return view('pages.admin.question-banks.question-bank', compact('questions', 'creators', 'subjects', 'departments', 'positions', 'totalQuestions'));
    }

    // 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.question-banks.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.question-banks.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.question-banks.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');
    }
}