/**
 * Brevo Email Service
 * Handles email delivery via Brevo (formerly Sendinblue)
 */

export interface BrevoEmailData {
  to: string;
  subject: string;
  html?: string;
  text?: string;
  templateName?: string;
  variables?: Record<string, any>;
  attachments?: Array<{
    name: string;
    content: Buffer;
    contentType: string;
  }>;
}

/**
 * Send email via Brevo
 */
export async function sendBrevoEmail(data: BrevoEmailData): Promise<{ success: boolean; messageId?: string; error?: string }> {
  try {
    // In production, this would call the Brevo API
    // For now, return mock success
    console.log(`[Brevo] Email sent to ${data.to}`);
    console.log(`[Brevo] Subject: ${data.subject}`);
    
    if (data.templateName) {
      console.log(`[Brevo] Template: ${data.templateName}`);
    }

    return {
      success: true,
      messageId: `msg-${Date.now()}`,
    };
  } catch (error) {
    console.error('[Brevo] Email send failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Send bulk emails via Brevo
 */
export async function sendBrevoBulkEmails(
  recipients: Array<{ email: string; name?: string }>,
  subject: string,
  html: string,
  templateName?: string,
  variables?: Record<string, any>
): 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 sendBrevoEmail({
        to: recipient.email,
        subject,
        html,
        templateName,
        variables: {
          ...variables,
          recipientName: recipient.name || 'Player',
        },
      });

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

  return results;
}

/**
 * Send transactional email via Brevo
 */
export async function sendBrevoTransactionalEmail(
  to: string,
  templateId: number,
  variables?: Record<string, any>
): Promise<{ success: boolean; messageId?: string; error?: string }> {
  try {
    console.log(`[Brevo] Transactional email sent to ${to}`);
    console.log(`[Brevo] Template ID: ${templateId}`);

    return {
      success: true,
      messageId: `msg-${Date.now()}`,
    };
  } catch (error) {
    console.error('[Brevo] Transactional email send failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Get email campaign statistics
 */
export async function getBrevoEmailStats(campaignId: number): Promise<{
  sent: number;
  opened: number;
  clicked: number;
  bounced: number;
  unsubscribed: number;
  complained: number;
}> {
  // In production, this would fetch from Brevo API
  return {
    sent: 1000,
    opened: 480,
    clicked: 240,
    bounced: 10,
    unsubscribed: 5,
    complained: 2,
  };
}

/**
 * Create email contact in Brevo
 */
export async function createBrevoContact(data: {
  email: string;
  firstName?: string;
  lastName?: string;
  attributes?: Record<string, any>;
  listIds?: number[];
}): Promise<{ success: boolean; contactId?: number; error?: string }> {
  try {
    console.log(`[Brevo] Contact created: ${data.email}`);

    return {
      success: true,
      contactId: Math.floor(Math.random() * 1000000),
    };
  } catch (error) {
    console.error('[Brevo] Contact creation failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Update email contact in Brevo
 */
export async function updateBrevoContact(
  email: string,
  data: {
    firstName?: string;
    lastName?: string;
    attributes?: Record<string, any>;
  }
): Promise<{ success: boolean; error?: string }> {
  try {
    console.log(`[Brevo] Contact updated: ${email}`);

    return {
      success: true,
    };
  } catch (error) {
    console.error('[Brevo] Contact update failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Add contact to list in Brevo
 */
export async function addBrevoContactToList(
  email: string,
  listId: number
): Promise<{ success: boolean; error?: string }> {
  try {
    console.log(`[Brevo] Contact ${email} added to list ${listId}`);

    return {
      success: true,
    };
  } catch (error) {
    console.error('[Brevo] Add to list failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}

/**
 * Remove contact from list in Brevo
 */
export async function removeBrevoContactFromList(
  email: string,
  listId: number
): Promise<{ success: boolean; error?: string }> {
  try {
    console.log(`[Brevo] Contact ${email} removed from list ${listId}`);

    return {
      success: true,
    };
  } catch (error) {
    console.error('[Brevo] Remove from list failed:', error);
    return {
      success: false,
      error: String(error),
    };
  }
}