<?php

namespace App\Http\Controllers;

use App\Models\User;
use App\Models\Classification;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class AdminController extends Controller
{
    public function dashboard()
    {
        $totalUsers = User::where('role', 'user')->count();
        $totalClassifications = Classification::count();

        $statistikKelas = Classification::select('label', DB::raw('count(*) as total'))
            ->groupBy('label')
            ->get();

        return view('admin.dashboard', compact('totalUsers', 'totalClassifications', 'statistikKelas'));
    }

    public function users()
    {
        $users = User::where('role', 'user')->latest()->get();
        return view('admin.users', compact('users'));
    }

    public function destroyUser($id)
    {
        $user = User::findOrFail($id);

        if ($user->role === 'admin') {
            return back()->withErrors(['error' => 'Akun admin tidak dapat dihapus.']);
        }

        $user->delete();

        return back()->with('success', 'Pengguna berhasil dihapus.');
    }

    public function exportCsv()
    {
        $classifications = Classification::all();

        $filename = "laporan_klasifikasi_kopi.csv";
        $handle = fopen('php://memory', 'w');

        // Membuat Baris Header CSV
        fputcsv($handle, ['ID', 'User ID', 'Hasil Klasifikasi', 'Akurasi (%)', 'Tanggal Pemindaian']);

        // Mengisi Baris Data
        foreach ($classifications as $row) {
            fputcsv($handle, [
                $row->id,
                $row->user_id,
                $row->label,
                $row->confidence,
                $row->created_at
            ]);
        }

        fseek($handle, 0);
        $headers = [
            'Content-Type' => 'text/csv',
            'Content-Disposition' => 'attachment; filename="' . $filename . '"',
        ];

        return response()->stream(function () use ($handle) {
            fpassthru($handle);
        }, 200, $headers);
    }
}