<?php

namespace App\Http\Controllers\User;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Models\Diagnosa;
use App\Models\Kriteria;
use App\Models\Kecerdasan;
use Illuminate\Support\Facades\Auth;

class PerhitunganAPHController extends Controller
{
    public function index()
    {
        $kriterias  = Kriteria::orderBy('nama')->get();
        $kecerdasans = Kecerdasan::orderBy('nama')->get();

        return view('user.perhitunganaph', compact('kriterias', 'kecerdasans'));
    }

    public function analisa(Request $request)
    {
        $request->validate([
            'kondisi'   => 'required|array|min:2',
            'kondisi.*' => 'regex:/^[A-Za-z0-9]+_[0-4]$/',
        ], [
            'kondisi.min'      => 'Pilih minimal 2 kriteria untuk analisa.',
            'kondisi.required' => 'Anda harus memilih kriteria.',
        ]);

        $kriterias  = Kriteria::orderBy('nama')->get();
        $kecerdasans = Kecerdasan::with(['basisPengetahuans' => function ($q) use ($request) {
            $ids = array_map(fn($item) => explode('_', $item)[0], $request->input('kondisi', []));
            $q->whereIn('kriteria_id', $ids);
        }])->orderBy('nama')->get();

        // Mapping level ke bobot
        $arbobot = [0 => 0, 1 => 0.25, 2 => 0.5, 3 => 0.75, 4 => 1.0];

        // Ambil tingkat kepastian per kriteria
        $kepastian = [];
        foreach ($request->kondisi as $item) {
            [$kritId, $lvl] = explode('_', $item);
            $kepastian[$kritId] = (int) $lvl;
        }

        $cfHasil = [];
        foreach ($kecerdasans as $kec) {
            $cfs = [];
            foreach ($kec->basisPengetahuans as $bp) {
                $level = $kepastian[$bp->kriteria_id] ?? 0;
                $cfs[] = $bp->nilai * $arbobot[$level];
            }
            // Gabungan CF
            $cfTotal = array_reduce($cfs, fn($acc, $cf) => $acc === null ? $cf : $acc + $cf * (1 - $acc), null);
            $cfHasil[$kec->id] = round($cfTotal ?? 0, 4);
        }

        arsort($cfHasil);
        $topId     = array_key_first($cfHasil);
        $presentase = ($cfHasil[$topId] ?? 0) * 100;

        // Simpan diagnosa (jika masih ingin simpan ke Diagnosa)
        Diagnosa::create([
            'user_id'    => Auth::id(),
            'kecerdasan_id' => $topId,
            'presentase' => $presentase,
            'catatan'    => null,
        ]);

        // Kirim data ke view
        return view('user.perhitunganaph', compact(
            'kriterias',
            'kecerdasans',
            'kepastian',
            'cfHasil'
        ))->with('success', 'Analisa berhasil dihitung.');
    }

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