<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Rule;
use App\Models\Penyakit;
use App\Models\Gejala;
use Illuminate\Http\Request;

class RuleController extends Controller
{
    // Tentukan nilai pakar dari nilai CF
    private function nilaiPakarDariCF(float $cf): int
    {
        if ($cf <= 0.2) return 1;
        if ($cf <= 0.4) return 2;
        if ($cf <= 0.6) return 3;
        if ($cf <= 0.8) return 4;
        return 5;
    }

    // Tampilkan daftar semua rule
    public function index()
    {
        $rules = Rule::with(['penyakit', 'gejala'])
            ->when(request('penyakit_id'), fn($q) =>
                $q->where('id_penyakit', request('penyakit_id'))
            )
            ->when(request('search'), fn($q) =>
                $q->where('kode_rule', 'like', '%' . request('search') . '%')
            )
            ->orderBy('kode_rule')
            ->paginate(15);

        $semuaPenyakit = Penyakit::orderBy('kode')->get();

        return view('admin.rule.index', compact('rules', 'semuaPenyakit'));
    }

    // Tampilkan form tambah rule
    public function create()
    {
        $penyakit = Penyakit::orderBy('kode')->get();
        $gejala   = Gejala::orderBy('kode')->get();
        return view('admin.rule.form', compact('penyakit', 'gejala'));
    }

    // Simpan rule baru
    public function store(Request $request)
    {
        $request->validate([
            'id_penyakit' => 'required|exists:tbl_penyakit,id',
            'id_gejala'   => 'required|exists:tbl_gejala,id',
            'nilai_mb'    => 'required|numeric|min:0|max:1',
            'nilai_md'    => 'required|numeric|min:0|max:1',
        ], [
            'id_penyakit.required' => 'Pilih penyakit terlebih dahulu.',
            'id_gejala.required'   => 'Pilih gejala terlebih dahulu.',
            'nilai_mb.required'    => 'Nilai MB wajib diisi.',
            'nilai_md.required'    => 'Nilai MD wajib diisi.',
        ]);

        // Cek kombinasi penyakit-gejala sudah ada
        $sudahAda = Rule::where('id_penyakit', $request->id_penyakit)
            ->where('id_gejala', $request->id_gejala)
            ->exists();

        if ($sudahAda) {
            return back()->withErrors(['id_gejala' => 'Rule untuk kombinasi penyakit dan gejala ini sudah ada.']);
        }

        // Hitung CF dan nilai pakar otomatis
        $mb       = (float) $request->nilai_mb;
        $md       = (float) $request->nilai_md;
        $cf       = round($mb - $md, 4);
        $pakar    = $this->nilaiPakarDariCF($cf);

        // Auto-generate kode rule jika kosong
        $kodeRule = $request->kode_rule;
        if (empty($kodeRule)) {
            $lastRule = Rule::orderByDesc('id')->first();
            $nextNum  = $lastRule ? (intval(substr($lastRule->kode_rule, 1)) + 1) : 1;
            $kodeRule = 'R' . str_pad($nextNum, 3, '0', STR_PAD_LEFT);
        }

        Rule::create([
            'kode_rule'   => strtoupper($kodeRule),
            'id_penyakit' => $request->id_penyakit,
            'id_gejala'   => $request->id_gejala,
            'nilai_mb'    => $mb,
            'nilai_md'    => $md,
            'nilai_cf'    => $cf,
            'nilai_pakar' => $pakar,
        ]);

        return redirect()->route('admin.rule.index')
            ->with('success', 'Rule "' . $kodeRule . '" berhasil ditambahkan.');
    }

    // Tampilkan form edit rule
    public function edit(Rule $rule)
    {
        $penyakit = Penyakit::orderBy('kode')->get();
        $gejala   = Gejala::orderBy('kode')->get();
        return view('admin.rule.form', compact('rule', 'penyakit', 'gejala'));
    }

    // Update rule
    public function update(Request $request, Rule $rule)
    {
        $request->validate([
            'id_penyakit' => 'required|exists:tbl_penyakit,id',
            'id_gejala'   => 'required|exists:tbl_gejala,id',
            'nilai_mb'    => 'required|numeric|min:0|max:1',
            'nilai_md'    => 'required|numeric|min:0|max:1',
        ]);

        // Hitung CF dan nilai pakar otomatis
        $mb    = (float) $request->nilai_mb;
        $md    = (float) $request->nilai_md;
        $cf    = round($mb - $md, 4);
        $pakar = $this->nilaiPakarDariCF($cf);

        $rule->update([
            'id_penyakit' => $request->id_penyakit,
            'id_gejala'   => $request->id_gejala,
            'nilai_mb'    => $mb,
            'nilai_md'    => $md,
            'nilai_cf'    => $cf,
            'nilai_pakar' => $pakar,
        ]);

        return redirect()->route('admin.rule.index')
            ->with('success', 'Rule "' . $rule->kode_rule . '" berhasil diperbarui.');
    }

    // Hapus rule
    public function destroy(Rule $rule)
    {
        $kode = $rule->kode_rule;
        $rule->delete();

        return redirect()->route('admin.rule.index')
            ->with('success', 'Rule "' . $kode . '" berhasil dihapus.');
    }
}