MIF_E31230302/app/Http/Controllers/PrediksiController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Services\C45Service;
use App\Services\PreprocessingService;
use App\Models\DataTesting;
use Illuminate\Support\Facades\Auth;

class PrediksiController extends Controller
{
    protected $c45Service;
    protected $preprocessingService;

    public function __construct(C45Service $c45Service, PreprocessingService $preprocessingService)
    {
        $this->c45Service = $c45Service;
        $this->preprocessingService = $preprocessingService;
    }

    public function index(Request $request)
    {
        $previousInput = [
            'nama'             => $request->query('nama'),
            'nilai'            => $request->query('nilai'),
            'mapel_favorit'    => $request->query('mapel_favorit'),
            'minat'            => $request->query('minat'),
            'cita_cita'        => $request->query('cita_cita'),
            'preferensi_studi' => $request->query('preferensi_studi'),
            'siswa_id'         => $request->query('siswa_id'),
        ];

        return view('prediksi.index', compact('previousInput'));
    }

    public function hitungRekomendasi(Request $request)
    {
        // 1. VALIDASI INPUT FORM
        $validatedData = $request->validate([
            'nama'             => 'nullable|string|max:255',
            'nilai'            => 'required|numeric|min:0|max:100',
            'mapel_favorit'    => 'required|string',
            'minat'            => 'required|string',
            'cita_cita'        => 'required|string',
            'preferensi_studi' => 'required|string',
            'siswa_id'         => 'nullable|exists:users,id',
        ]);

        // 2. TANGKAP INPUT MENTAH (RAW)
        $inputRaw = [
            'nilai'            => $validatedData['nilai'],
            'mapel_favorit'    => $validatedData['mapel_favorit'],
            'minat'            => $validatedData['minat'],
            'cita_cita'        => $validatedData['cita_cita'],
            'preferensi_studi' => $validatedData['preferensi_studi']
        ];

        // 3. PROSES PREPROCESSING
        $dataBersih = $this->preprocessingService->preprocess((object) $inputRaw);

        // 4. JALANKAN PREDIKSI C4.5 LENGKAP
        if (method_exists($this->c45Service, 'predictDetail')) {
            $hasilPrediksi = $this->c45Service->predictDetail($inputRaw);
            $hasilJurusan  = $hasilPrediksi['rekomendasi_utama'] ?? 'Teknologi Informasi';
            $rulePath      = $hasilPrediksi['rule_path'] ?? [];
        } else {
            $hasilJurusan  = 'Teknologi Informasi';
            $rulePath      = [
                'Nilai = ' . ($dataBersih['nilai'] ?? $inputRaw['nilai']),
                'Mapel Favorit = ' . $inputRaw['mapel_favorit'],
                'Preferensi = ' . $inputRaw['preferensi_studi'],
                'Minat = ' . $inputRaw['minat']
            ];
        }

        // Helper akses data bersih
        $getVal = fn($key) => is_array($dataBersih) ? ($dataBersih[$key] ?? '') : ($dataBersih->{$key} ?? '');

        // 5. PENENTUAN USER_ID DAN CREATED_BY
        $currentUser = Auth::user();
        $createdBy   = $currentUser ? $currentUser->id : null;
        $userId      = ($currentUser && $currentUser->role === 'admin') 
                        ? $request->input('siswa_id', null) 
                        : ($currentUser->id ?? null);

        // 6. SIMPAN KE DATABASE
        $dataTesting = DataTesting::create([
            'user_id'              => $userId,    
            'created_by'           => $createdBy, 
            'nama'                 => $validatedData['nama'] ?? ($currentUser->name ?? 'Siswa/User'),
            'nilai_raw'            => $inputRaw['nilai'],
            'mapel_favorit_raw'    => $inputRaw['mapel_favorit'],
            'minat_raw'            => $inputRaw['minat'],
            'cita_cita_raw'        => $inputRaw['cita_cita'],
            'preferensi_studi_raw' => $inputRaw['preferensi_studi'],
            'nilai'                => $getVal('nilai'),
            'mapel_favorit'        => $getVal('mapel_favorit'),
            'minat'                => $getVal('minat'),
            'cita_cita'            => $getVal('cita_cita'),
            'preferensi_studi'     => $getVal('preferensi_studi'),
            'hasil_rekomendasi'    => $hasilJurusan,
        ]);

        // 7. DIRECT VIEW BERDASARKAN ROLE USER
        $viewData = [
            'dataTesting'  => $dataTesting,
            'hasilJurusan' => $hasilJurusan,
            'rulePath'     => $rulePath,
            'dataBersih'   => $dataBersih,
        ];

        if ($currentUser && $currentUser->role === 'admin') {
            $viewData['isAdmin'] = true;
        }

        return view('prediksi.hasil', $viewData);
    }

    public function riwayat()
    {
        $riwayats = DataTesting::where('user_id', Auth::id())
            ->latest()
            ->paginate(10);

        return view('siswa.riwayat', compact('riwayats'));
    }

    public function showRiwayat($id)
    {
        $query = DataTesting::query();
        if (Auth::user()->role !== 'admin') {
            $query->where('user_id', Auth::id());
        }

        $dataTesting = $query->findOrFail($id);

        $inputRaw = [
            'nilai'            => $dataTesting->nilai_raw ?? $dataTesting->nilai,
            'mapel_favorit'    => $dataTesting->mapel_favorit_raw ?? $dataTesting->mapel_favorit,
            'minat'            => $dataTesting->minat_raw ?? $dataTesting->minat,
            'cita_cita'        => $dataTesting->cita_cita_raw ?? $dataTesting->cita_cita,
            'preferensi_studi' => $dataTesting->preferensi_studi_raw ?? $dataTesting->preferensi_studi,
        ];

        $dataBersih = $this->preprocessingService->preprocess((object) $inputRaw);

        if (method_exists($this->c45Service, 'predictDetail')) {
            $hasilPrediksi = $this->c45Service->predictDetail($inputRaw);
            $rulePath      = $hasilPrediksi['rule_path'] ?? [];
        } else {
            $rulePath = [];
        }

        return view('prediksi.hasil', [
            'dataTesting'  => $dataTesting,
            'hasilJurusan' => $dataTesting->hasil_rekomendasi,
            'rulePath'     => $rulePath,
            'dataBersih'   => $dataBersih,
        ]);
    }

    public function destroyRiwayat($id)
    {
        $data = DataTesting::where('user_id', Auth::id())->findOrFail($id);
        $data->delete();

        return redirect()->route('riwayat.index')->with('success', 'Catatan riwayat rekomendasi berhasil dihapus.');
    }
}