/**
 * SMS Delivery Service
 * Handles SMS delivery via Twilio or similar provider
 */

export interface SMSData {
  to: string;
  message: string;
  from?: string;
}

/**
 * Send SMS message
 */
export async function sendSMS(data: SMSData): Promise<{ success: boolean; messageId?: string; error?: string }> {
  try {
    // In production, this would call Twilio API or similar
    console.log(`[SMS] Message sent to ${data.to}`);
    console.log(`[SMS] Message: ${data.message.substring(0, 50)}...`);

    return {
      success: true,
      messageId: `sms-${Date.now()}`,
    };
  } catch (error) {
    console.error('[SMS] Send failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Send bulk SMS messages
 */
export async function sendBulkSMS(
  recipients: string[],
  message: string
): Promise<{ success: boolean; sent: number; failed: number; errors: string[] }> {
  const results = {
    success: true,
    sent: 0,
    failed: 0,
    errors: [] as string[],
  };

  for (const recipient of recipients) {
    try {
      const result = await sendSMS({
        to: recipient,
        message,
      });

      if (result.success) {
        results.sent++;
      } else {
        results.failed++;
        results.errors.push(`Failed to send to ${recipient}: ${result.error}`);
      }
    } catch (error) {
      results.failed++;
      results.errors.push(`Failed to send to ${recipient}: ${error}`);
    }
  }

  return results;
}

/**
 * Get SMS delivery status
 */
export async function getSMSStatus(messageId: string): Promise<{
  status: 'sent' | 'delivered' | 'failed' | 'undelivered';
  timestamp: Date;
  error?: string;
}> {
  // In production, this would fetch from Twilio API
  return {
    status: 'delivered',
    timestamp: new Date(),
  };
}

/**
 * Get SMS campaign statistics
 */
export async function getSMSCampaignStats(campaignId: number): Promise<{
  sent: number;
  delivered: number;
  failed: number;
  undelivered: number;
  bounced: number;
  optedOut: number;
}> {
  // In production, this would fetch from SMS provider
  return {
    sent: 500,
    delivered: 475,
    failed: 15,
    undelivered: 8,
    bounced: 2,
    optedOut: 0,
  };
}

/**
 * Opt-out phone number from SMS
 */
export async function optOutPhoneNumber(phoneNumber: string): Promise<{ success: boolean; error?: string }> {
  try {
    console.log(`[SMS] Phone number opted out: ${phoneNumber}`);

    return {
      success: true,
    };
  } catch (error) {
    console.error('[SMS] Opt-out failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Opt-in phone number for SMS
 */
export async function optInPhoneNumber(phoneNumber: string): Promise<{ success: boolean; error?: string }> {
  try {
    console.log(`[SMS] Phone number opted in: ${phoneNumber}`);

    return {
      success: true,
    };
  } catch (error) {
    console.error('[SMS] Opt-in failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Check if phone number is opted out
 */
export async function isPhoneNumberOptedOut(phoneNumber: string): Promise<boolean> {
  // In production, this would check against SMS provider's opt-out list
  return false;
}

/**
 * Get SMS rate limit status
 */
export async function getSMSRateLimitStatus(): Promise<{
  remaining: number;
  limit: number;
  resetAt: Date;
}> {
  // In production, this would check actual rate limits
  return {
    remaining: 9850,
    limit: 10000,
    resetAt: new Date(Date.now() + 24 * 60 * 60 * 1000),
  };
}