<?php

namespace App\Http\Controllers\Pengguna;

use App\Http\Controllers\Pengguna\PenggunaController;
use Illuminate\Http\Request;
use App\Models\Diagnosa;
use App\Models\Kriteria;
use App\Models\Jurusan;

class DiagnosaController extends PenggunaController
{
    public function index()
    {
        // Ambil semua kriteria
        $kriterias = Kriteria::all();
        return view('pengguna.diagnosa.index', compact('kriterias'));
    }

    public function analisa(Request $request)
    {
        if (empty($request->kondisi) || count($request->kondisi) < 2) {
            $this->notification('success', 'Sehat', 'Tanpa kriteria signifikan');
            return redirect()->route('pengguna.diagnosa.index');
        }

        $arbobot = [0, 1, 0.75, 0.5, 0.25];
        $kepastian = [];

        // Parse input kondisi: ["kriteriaId_level", ...]
        foreach ($request->kondisi as $item) {
            list($kriteriaId, $level) = explode('_', $item);
            $kepastian[$kriteriaId] = (int) $level;
        }

        // Ambil semua jurusan dan basis pengetahuan yang relevan
        $jurusans = Jurusan::with(['basisPengetahuan' => function ($q) use ($kepastian) {
            $q->whereIn('kriteria_id', array_keys($kepastian));
        }])->get();

        $cfHasil = [];

        // Hitung CF untuk tiap jurusan
        foreach ($jurusans as $jurusan) {
            $cfs = [];
            foreach ($jurusan->basisPengetahuan as $bp) {
                $level = $kepastian[$bp->kriteria_id] ?? 0;
                $cfs[] = $bp->nilai * $arbobot[$level];
            }

            // Kombinasi CF
            $cfTotal = 0;
            foreach ($cfs as $idx => $cf) {
                if ($idx === 0) {
                    $cfTotal = $cf;
                } else {
                    $cfTotal = $cfTotal + $cf * (1 - $cfTotal);
                }
            }

            $cfHasil[$jurusan->id] = round($cfTotal, 4);
        }

        // Urutkan dan simpan
        arsort($cfHasil);
        $topId = array_key_first($cfHasil);

        Diagnosa::create([
            'user_id'    => session('biodata.user_id'),
            'jurusan_id' => $topId,
            'presentase' => $cfHasil[$topId] * 100,
            'catatan'    => null,
        ]);

        // Kembali ke view hasil
        return view('pengguna.diagnosa.analisa', [
            'cfHasil'   => $cfHasil,
            'jurusans'  => $jurusans,
            'kepastian' => $kepastian,
            'topId'     => $topId,
        ]);
    }

    public function reset(Request $request)
    {
        $request->session()->forget('biodata');
        return redirect()->route('pengguna.biodata.index');
    }
}