<?php

namespace App\Http\Controllers\User;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Auth;
use App\Models\MapelUn;
use App\Models\Jurusan;
use App\Models\BasisAhp;
use App\Models\NilaiUn;
use App\Models\HasilAhp;


class NewAhpController extends Controller
{
    /**
     * Tampilkan form input dan data awal.
     */
    public function index()
    {
        $mapels   = MapelUn::pluck('nama', 'id');
        $jurusans = Jurusan::pluck('nama', 'id');
        $basisAhp = BasisAhp::all()
                        ->groupBy('mapel_id')
                        ->map(fn($rows) => $rows->pluck('cf_value','jurusan_id'))
                        ->toArray();

        return view('user.new', compact('mapels', 'jurusans', 'basisAhp'));
    }

    /**
     * Proses perhitungan SPK AHP + CF.
     */
    public function process(Request $request)
{
    // validasi input
    $request->validate([
        'nilai.*' => 'required|numeric|min:0|max:100',
    ]);

    $userId   = Auth::id();
    $mapels   = MapelUn::pluck('nama','id')->toArray();
    $jurusans = Jurusan::pluck('nama','id')->toArray();
    $basisAhp = BasisAhp::all()
                        ->groupBy('mapel_id')
                        ->map(fn($rows) => $rows->pluck('cf_value','jurusan_id')->toArray())
                        ->toArray();

    // Ambil skor UN dari request
    $scores = array_map('floatval', $request->input('nilai'));
    $ids    = array_keys($mapels);
    $n      = count($ids);

    // 1. Matriks perbandingan kriteria
    $matrixCrit = [];
    foreach ($ids as $i) {
        foreach ($ids as $j) {
            $den = $scores[$j] ?: 1;
            $matrixCrit[$i][$j] = round($scores[$i] / $den, 4);
        }
    }

    // 2. Jumlah kolom
    $sumColCrit = [];
    foreach ($ids as $j) {
        $col = array_column($matrixCrit, $j);
        $sumColCrit[$j] = round(array_sum($col), 4);
    }

    // 3. Normalisasi & bobot kriteria
    $normCrit    = [];
    $critWeights = [];
    foreach ($ids as $i) {
        $rowSum = 0;
        foreach ($ids as $j) {
            $normCrit[$i][$j] = $sumColCrit[$j]
                ? round($matrixCrit[$i][$j] / $sumColCrit[$j], 4)
                : 0;
            $rowSum += $normCrit[$i][$j];
        }
        $critWeights[$i] = round($rowSum / $n, 4);
    }

    // 4. Bobot alternatif per kriteria
    $altWeights = [];
    foreach ($ids as $cid) {
        $row       = $basisAhp[$cid] ?? [];
        $totalCF   = array_sum($row);
        foreach ($jurusans as $aid => $_) {
            $altWeights[$cid][$aid] = $totalCF
                ? round(($row[$aid] ?? 0) / $totalCF, 4)
                : 0;
        }
    }

    // 5. Hitung skor global
    $globalScores = [];
    foreach ($jurusans as $aid => $_) {
        $s = 0;
        foreach ($ids as $cid) {
            $s += $critWeights[$cid] * ($altWeights[$cid][$aid] ?? 0);
        }
        $globalScores[$aid] = $s;
    }
    arsort($globalScores);

    // Simpan ke database (Menambahkan data tanpa menghapus data lama)
    if ($userId) {
        // Menambahkan nilai UN tanpa memperbarui data yang sudah ada
        foreach ($scores as $mid => $val) {
            NilaiUn::create([
                'user_id' => $userId,
                'mapel_id' => $mid,
                'nilai' => $val,
            ]);
        }

        // Menambahkan hasil AHP tanpa menghapus data sebelumnya
        $rank = 1;
        foreach ($globalScores as $aid => $s) {
            HasilAhp::create([
                'user_id'    => $userId,
                'jurusan_id' => $aid,
                'score'      => $s,
                'ranking'    => $rank++,
            ]);
        }
    }

    // Render kembali view dengan data hasil
    return view('user.new', compact(
        'mapels','jurusans','basisAhp',
        'matrixCrit','sumColCrit','normCrit','critWeights',
        'altWeights','globalScores',
        'ids'
    ));
}

}