<?php

namespace App\Services\Billing;

use App\Services\Messaging\CustomerSmsClient;
use App\Services\Messaging\MessagingCredentialsService;

/**
 * Attendee SMS: prefer platform suite messaging (zero-config), fall back to
 * product SMS API keys when suite is unavailable.
 */
class SmsService
{
    private ?string $lastError = null;

    public function __construct(
        private readonly CustomerSmsClient $customer,
        private readonly MessagingCredentialsService $credentials,
        private readonly PlatformSmsClient $platformSms,
    ) {}

    public function lastError(): ?string
    {
        return $this->lastError;
    }

    public function isConfiguredForOwner(string $ownerPublicId): bool
    {
        if ($this->platformSms->isConfigured()) {
            return true;
        }

        return $this->credentials->forOwner($ownerPublicId)->hasValidSms();
    }

    public function send(string $ownerPublicId, string $to, string $message): bool
    {
        $this->lastError = null;

        $phone = preg_replace('/\D+/', '', $to);
        if (strlen($phone) < 9) {
            $this->lastError = 'Enter a valid phone number.';

            return false;
        }

        if (strlen($phone) === 9) {
            $phone = '233'.$phone;
        } elseif (str_starts_with($phone, '0')) {
            $phone = '233'.substr($phone, 1);
        }

        $credential = $this->credentials->forOwner($ownerPublicId);

        if ($this->platformSms->isConfigured()) {
            $sender = $credential->sms_sender_id ?: null;
            $sent = $this->platformSms->send(
                $ownerPublicId,
                $phone,
                $message,
                $sender ? (string) $sender : null,
            );
            if ($sent) {
                return true;
            }

            $suiteError = $this->platformSms->lastError();
            if ($this->tryCustomerSms($credential, $phone, $message)) {
                return true;
            }

            $this->lastError = $suiteError ?: $this->lastError;

            return false;
        }

        return $this->tryCustomerSms($credential, $phone, $message);
    }

    private function tryCustomerSms(object $credential, string $phone, string $message): bool
    {
        if (! $credential->hasValidSms()) {
            $this->lastError = 'SMS is not available (platform SMS key missing and no product SMS credentials).';

            return false;
        }

        $apiKey = $credential->smsApiKey();
        if (! $apiKey) {
            $this->lastError = 'SMS credentials could not be decrypted. Reconnect SMS under Advanced keys.';

            return false;
        }

        $sent = $this->customer->send($apiKey, $phone, $message, (string) $credential->sms_sender_id);
        if (! $sent) {
            $this->lastError = $this->customer->lastError() ?: 'The SMS could not be sent.';
        }

        return $sent;
    }
}