<?php

namespace App\Services\Auth;

use App\Models\OtpCode;
use Carbon\Carbon;

class OtpService
{
    /**
     * Generate and save an OTP code for an identifier.
     */
    public function generate(string $identifier, int $expiryMinutes = 10): string
    {
        // Delete old unexpired codes for this identifier to avoid clutter
        OtpCode::where('identifier', $identifier)
            ->whereNull('verified_at')
            ->delete();

        $code = (string) random_int(100000, 999999);

        OtpCode::create([
            'identifier' => $identifier,
            'code' => $code,
            'expires_at' => Carbon::now()->addMinutes($expiryMinutes),
        ]);

        return $code;
    }

    /**
     * Verify the OTP code.
     */
    public function verify(string $identifier, string $code): bool
    {
        $otp = OtpCode::where('identifier', $identifier)
            ->where('code', $code)
            ->whereNull('verified_at')
            ->where('expires_at', '>', Carbon::now())
            ->latest()
            ->first();

        if ($otp) {
            $otp->update(['verified_at' => Carbon::now()]);

            return true;
        }

        return false;
    }

    /**
     * Clear expired codes.
     */
    public function cleanup(): void
    {
        OtpCode::where('expires_at', '<', Carbon::now())
            ->whereNull('verified_at')
            ->delete();
    }
}