<?php

namespace App\Services\Auth;

use App\Models\User;
use Illuminate\Support\Facades\Hash;
use Illuminate\Validation\ValidationException;

class AuthService
{
    public function register(array $data): array
    {
        $code = $this->generateCode();

        $user = User::create([
            'name' => $data['name'],
            'username' => $data['username'] ?? null,
            'email' => $data['email'],
            'whatsapp_number' => $data['whatsapp_number'],
            'password' => Hash::make($data['password']),
            'is_master' => false,
            'status' => 'inactive',
            'verification_channel' => $data['verification_channel'],
            'verification_target' => $data['verification_target'],
            'verification_code' => $code,
            'verification_code_expires_at' => now()->addMinutes(10),
            'verified_at' => null,
        ]);

        return [
            'user' => $user,
            'verification' => [
                'channel' => $user->verification_channel,
                'target' => $user->verification_target,
                'code' => $code,
                'expires_at' => $user->verification_code_expires_at,
            ],
        ];
    }

    public function verifyRegistration(array $data): User
    {
        $user = User::query()
            ->where('verification_channel', $data['verification_channel'])
            ->where('verification_target', $data['verification_target'])
            ->first();

        if (!$user) {
            throw ValidationException::withMessages([
                'verification_target' => 'Target verifikasi tidak ditemukan.',
            ]);
        }

        if (empty($user->verification_code) || $user->verification_code !== $data['verification_code']) {
            throw ValidationException::withMessages([
                'verification_code' => 'Kode verifikasi tidak valid.',
            ]);
        }

        if (
            empty($user->verification_code_expires_at) ||
            now()->greaterThan($user->verification_code_expires_at)
        ) {
            throw ValidationException::withMessages([
                'verification_code' => 'Kode verifikasi sudah kadaluarsa.',
            ]);
        }

        $user->update([
            'status' => 'active',
            'verified_at' => now(),
            'verification_code' => null,
            'verification_code_expires_at' => null,
        ]);

        return $user->fresh();
    }

    public function resendVerificationCode(array $data): array
    {
        $user = User::query()
            ->where('verification_channel', $data['verification_channel'])
            ->where('verification_target', $data['verification_target'])
            ->first();

        if (!$user) {
            throw ValidationException::withMessages([
                'verification_target' => 'Target verifikasi tidak ditemukan.',
            ]);
        }

        if ($user->status === 'active') {
            throw ValidationException::withMessages([
                'user' => 'User sudah aktif dan tidak memerlukan verifikasi ulang.',
            ]);
        }

        $code = $this->generateCode();

        $user->update([
            'verification_code' => $code,
            'verification_code_expires_at' => now()->addMinutes(10),
        ]);

        return [
            'channel' => $user->verification_channel,
            'target' => $user->verification_target,
            'code' => $code,
            'expires_at' => $user->verification_code_expires_at,
        ];
    }

    protected function generateCode(): string
    {
        return str_pad((string) random_int(0, 999999), 6, '0', STR_PAD_LEFT);
    }
}