<?php

namespace App\Http\Controllers;

use App\Models\Diagnosis;
use App\Models\Disease;
use App\Models\Notification;
use App\Models\Symptom;
use Illuminate\Http\Request;

class DiagnosisController extends Controller
{
    public function create()
    {
        $symptoms = Symptom::orderBy('code')->get();
        return view('diagnosis.create', compact('symptoms'));
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'symptoms' => 'required|array|min:4',
        ]);

        $gejalaInput = [];
        $gejalaLabels = [];

        $namaGejala = Symptom::pluck('name', 'code');

        foreach ($validated['symptoms'] as $kode => $cfUser) {
            if (isset($cfUser) && $cfUser !== '') {
                $cfUser = (float) $cfUser;
                $cfUser = min($cfUser, 0.8);
                $gejalaInput[$kode] = $cfUser;
                $gejalaLabels[$kode] = [
                    'nama' => $namaGejala[$kode] ?? $kode,
                    'cf'   => $cfUser,
                ];
            }
        }

        if (count($gejalaInput) < 4) {
            return back()->withErrors(['symptoms' => 'Pilih minimal 4 gejala.']);
        }

        $hasilDiagnosa = $this->diagnosaLengkap($gejalaInput);
        $utama = $hasilDiagnosa[0] ?? null;

        $diagnosis = Diagnosis::create([
            'user_id'      => auth()->id(),
            'plant_name'   => 'Tebu',
            'symptoms'     => $gejalaLabels,
            'disease_name' => $utama ? $utama['nama'] : 'Tidak Terdeteksi',
            'treatment'    => $utama ? implode('; ', $utama['solusi']) : '-',
            'confidence'   => $utama ? $utama['persentase'] : 0,
        ]);

        Notification::create([
            'user_id' => auth()->id(),
            'type'    => 'diagnosis',
            'title'   => 'Diagnosa Selesai',
            'message' => 'Diagnosa tanaman tebu selesai. Penyakit terdeteksi: ' . ($utama ? $utama['nama'] . ' (' . $utama['persentase'] . '%)' : 'Tidak Terdeteksi') . '.',
            'is_read' => false,
        ]);

        $admins = \App\Models\User::where('role', 'admin')
            ->where('id', '!=', auth()->id())
            ->get();

        foreach ($admins as $admin) {
            Notification::create([
                'user_id' => $admin->id,
                'type'    => 'diagnosis',
                'title'   => 'Diagnosa Baru dari ' . auth()->user()->name,
                'message' => 'User ' . auth()->user()->name . ' baru saja melakukan diagnosa. Penyakit terdeteksi: ' . ($utama ? $utama['nama'] . ' (' . $utama['persentase'] . '%)' : 'Tidak Terdeteksi') . '.',
                'is_read' => false,
            ]);
        }

        return redirect()->route('diagnosis.result', $diagnosis->id);
    }

    public function result($id)
    {
        $diagnosis = Diagnosis::where('user_id', auth()->id())->findOrFail($id);

        // DEBUG SEMENTARA — hapus setelah selesai debug
        $gejalaInputDebug = collect($diagnosis->symptoms)
            ->mapWithKeys(fn($v, $k) => [$k => $v['cf']])
            ->toArray();

        $debugInfo = $this->diagnosaLengkap($gejalaInputDebug, debug: true);

        return view('diagnosis.result', compact('diagnosis', 'debugInfo'));
    }

    private function diagnosaLengkap(array $gejalaInput, bool $debug = false): array
    {
        $hasil = [];
        $diseases = Disease::with(['symptoms', 'treatments'])->get();

        foreach ($diseases as $disease) {
            $cfCombine = 0;
            $first = true;
            $cocok = false;
            $steps = [];

            foreach ($disease->symptoms as $symptom) {
                $kodeGejala = $symptom->code;
                $cfPakar    = (float) $symptom->pivot->cf_value;

                if (isset($gejalaInput[$kodeGejala])) {
                    $cocok  = true;
                    $cfUser = $gejalaInput[$kodeGejala];
                    $cf     = $cfUser * $cfPakar;

                    if ($first) {
                        $cfCombine = $cf;
                        $first = false;
                    } else {
                        $cfCombine = $cfCombine + ($cf * (1 - $cfCombine));
                    }

                    if ($debug) {
                        $steps[] = [
                            'gejala'   => $kodeGejala,
                            'cf_pakar' => $cfPakar,
                            'cf_user'  => $cfUser,
                            'cf_komb'  => round($cf, 6),
                            'cf_akum'  => round($cfCombine, 6),
                        ];
                    }
                }
            }

            if ($cocok) {
                $treatments = [];
                if ($disease->treatments && $disease->treatments->count()) {
                    $treatments = $disease->treatments
                        ->sortBy('order')
                        ->pluck('description')
                        ->toArray();
                }

                $entry = [
                    'nama'       => $disease->name,
                    'persentase' => round($cfCombine * 100, 2),
                    'solusi'     => count($treatments) ? $treatments : ['-'],
                ];

                if ($debug) {
                    $entry['steps'] = $steps;
                }

                $hasil[] = $entry;
            }
        }

        usort($hasil, fn($a, $b) => $b['persentase'] <=> $a['persentase']);

        return $hasil;
    }
}