<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Diagnosa;
use App\Models\Gejala;
use App\Models\NilaiKeyakinanCF;
use App\Models\Penyakit;
use App\Models\Rule;
use Yajra\DataTables\Facades\DataTables;

class DiagnosaController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth');
        parent::__construct();
    }

    public function index(Request $request)
    {
        if ($request->ajax()) {
            $data = Diagnosa::with("data_penyakit")->latest();

            return DataTables::of($data)
                ->addIndexColumn()

                ->addColumn('gejala', function ($data) {
                    $gejala = "";
                    $value_gejala = json_decode($data->code_gejala);
                    foreach ($value_gejala as $item) {
                        $model = Gejala::where("code", $item)->first();
                        if ($model) {
                            $gejala .= $model->code . '-' . $model->name . '<br>';
                        } else {
                            $gejala .= $item . '<br>';
                        }
                    }
                    return $gejala;
                })

                ->addColumn('cf_user', function ($data) {
                    $cf_user = "";
                    $value_cfuser = json_decode($data->value_cf_user);
                    foreach ($value_cfuser as $item) {
                        $text = "";
                        if ($item == 1) {
                            $text = "Sangat Yakin";
                        } elseif ($item == 0.8) {
                            $text = "Yakin";
                        } else if ($item == 0.6) {
                            $text = "Cukup Yakin";
                        } elseif ($item == 0.4) {
                            $text = "Sedikit Yakin";
                        } elseif ($item == 0.2) {
                            $text = "Tidak Tahu";
                        } elseif ($item == 0) {
                            $text = "Tidak";
                        }

                        $cf_user .= $text . " ($item)" . '<br>';
                    }
                    return $cf_user;
                })

                ->addColumn('result', function ($data) {
                    return $data->result . " %";
                })

                ->addColumn('cf_pakar', function ($data) {
                    $cf_pakar = "";
                    $value_cfpakar = json_decode($data->value_cf_pakar);
                    foreach ($value_cfpakar as $item) {
                        $cf_pakar .= $item . '<br>';
                    }
                    return $cf_pakar;
                })

                ->addColumn('image', function ($data) {
                    if ($data->data_penyakit->image) {
                        $url = $data->data_penyakit->image;
                        return '<a href="/storage/' . $url . '" target="_blank"><img src="' . asset("storage/$url") . '" style="width: 35px"></a>';
                    }
                    return '';
                })

                ->addColumn('action', function ($data) {
                    return '<button type="button" class="btn btn-danger btn-rounded btn-fw p-2" id="delete" value="' . $data->id . '">Hapus</button>';
                })
                ->rawColumns(['action', 'gejala', 'cf_user',  'cf_pakar', 'result', 'image'])
                ->make(true);
        }

        return view('diagnosa.index');
    }

    public function add()
    {
        $gejala = Gejala::all();
        $nilaiKeyakinanCF = NilaiKeyakinanCF::orderBy("nilai", "desc")->get();
        return view('diagnosa.create', compact('gejala', 'nilaiKeyakinanCF'));
    }

    public function proses(Request $request)
    {
        $gejalaDipilih = $request->input('gejala');  // Gejala yang dipilih user
        $cfUserValues = $request->input('cf_user'); // Nilai CF User (0 - 1)

        if (empty($gejalaDipilih)) {
            return redirect()->route('diagnosa.index')->with('error', 'Silakan pilih minimal satu gejala.');
        }

        $cfPakarSaved = [];
        $gejalaSaved = [];
        $cfPakar = [];
        $cfHE = [];

        // Mengambil nilai CF dari pakar berdasarkan gejala yang dipilih
        foreach ($gejalaDipilih as $key => $idGejala) {
            $gejala = Gejala::find($idGejala);
            if (!$gejala) continue;

            $gejalaSaved[] = $gejala->code;

            $cfPakar[$idGejala] = $gejala->value_cf_pakar;
            $cfPakarSaved[] = $gejala->value_cf_pakar;
            $cfHE[$idGejala] = $cfPakar[$idGejala] * $cfUserValues[$key];
        }

        // Menghitung CF Combine
        $cfCombine = array_shift($cfHE);
        foreach ($cfHE as $cf) {
            $cfCombine = ($cfCombine + $cf) * (1 - $cfCombine);
        }

        $persen = $cfCombine * 100;

        // Menentukan penyakit berdasarkan gejala
        $penyakit = $this->deteksiPenyakit($gejalaDipilih);

        // Simpan hasil ke database
        $diagnosa = Diagnosa::create([
            'code_gejala' => json_encode($gejalaSaved),
            'value_cf_user' => json_encode($cfUserValues),
            'value_cf_pakar' => json_encode($cfPakarSaved),
            'result' =>  round($persen),
            'id_penyakit' => $penyakit->id ?? 'null',
            'penyakit' => $penyakit->name ?? 'Tidak Diketahui',
            'solution' => $penyakit->solution ?? 'Tidak ada solusi'
        ]);

        return redirect()->route('diagnosa.index')->with('success', 'Diagnosa berhasil dilakukan!');
    }

    private function deteksiPenyakit($gejalaDipilih)
    {
        $rules = Rule::whereIn('id_gejala', $gejalaDipilih)->get();
        $penyakitTeridentifikasi = [];

        foreach ($rules as $rule) {
            $penyakitTeridentifikasi[$rule->id_penyakit] = ($penyakitTeridentifikasi[$rule->id_penyakit] ?? 0) + 1;
        }

        arsort($penyakitTeridentifikasi); // Urutkan penyakit berdasarkan gejala terbanyak
        $idPenyakitTerbesar = key($penyakitTeridentifikasi);

        return Penyakit::find($idPenyakitTerbesar);
    }

    public function delete(Request $request)
    {
        $id = $request->id;
        $data = Diagnosa::findOrFail($id);
        try {
            $data->delete();
            return response()->json(['status' => 'success', 'message' => 'Berhasil Menghapus Data']);
        } catch (\Illuminate\Database\QueryException $ex) {
            if ($ex->getCode() === '23000')
                return response()->json(['status' => 'error', 'message' => 'Gagal Menghapus Data: Terdapat Ketergantungan Data.']);
        } catch (\Throwable $e) {
            return response()->json(['status' => 'error', 'message' => 'Terjadi Kesalahan: ' . $e->getMessage()]);
        }
    }
}