<?php
// ============================================================
// FILE 1: app/Http/Controllers/Admin/MapelController.php
// ============================================================

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Mapel;
use App\Models\Kelas;
use Illuminate\Http\Request;

class MapelController extends Controller
{
    public function index(Request $request)
    {
        $query = Mapel::query();

        // SEARCH
        if ($request->has('search')) {
            $search = $request->search;
            $query->where('nama_mapel', 'like', "%$search%")
                  ->orWhere('id_mapel', 'like', "%$search%");
        }

        // FILTER BY KELAS (lewat table mengajars)
        if ($request->has('filter_kelas') && $request->filter_kelas != '') {
            $query->whereHas('mengajars', function($q) use ($request) {
                $q->where('id_kelas', $request->filter_kelas);
            });
        }

        // SHOW PER PAGE
        $perPage = $request->get('perPage', 10);

        $mapels = $query->paginate($perPage)->appends($request->all());

        // Ambil semua kelas untuk dropdown filter
        $kelass = Kelas::orderBy('tingkat')->orderBy('nama_kelas')->get();

        return view('admin.mapel.index', compact('mapels', 'kelass'));
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'nama_mapel' => 'required|string|max:100',
        ], [
            'nama_mapel.required' => 'Nama mata pelajaran wajib diisi',
        ]);

        // Auto-generate id_mapel
        $lastMapel = Mapel::orderBy('id_mapel', 'desc')->first();
        
        if ($lastMapel) {
            $lastNumber = (int) substr($lastMapel->id_mapel, 2); // Ambil angka setelah "MP"
            $newNumber = $lastNumber + 1;
        } else {
            $newNumber = 1;
        }

        $newIdMapel = 'MP' . str_pad($newNumber, 3, '0', STR_PAD_LEFT); // MP001, MP002, dst

        Mapel::create([
            'id_mapel' => $newIdMapel,
            'nama_mapel' => $validated['nama_mapel'],
        ]);

        return redirect()->route('admin.mapel.index')
            ->with('success', 'Data mata pelajaran berhasil ditambahkan!');
    }

    public function update(Request $request, $id_mapel)
    {
        $mapel = Mapel::findOrFail($id_mapel);

        $validated = $request->validate([
            'nama_mapel' => 'required|string|max:100',
        ], [
            'nama_mapel.required' => 'Nama mata pelajaran wajib diisi',
        ]);

        $mapel->update($validated);

        return redirect()->route('admin.mapel.index')
            ->with('success', 'Data mata pelajaran berhasil diupdate!');
    }

    public function destroy($id_mapel)
    {
        $mapel = Mapel::findOrFail($id_mapel);
        $mapel->delete();

        return redirect()->route('admin.mapel.index')
            ->with('success', 'Data mata pelajaran berhasil dihapus!');
    }
}