/**
 * Email Service Interface
 *
 * Core defines the contract. The email extension registers a real
 * implementation (Resend). Without the extension, a no-op service
 * is used — email-dependent features degrade gracefully.
 */

export interface SendEmailOptions {
  to: string | string[]
  subject: string
  html: string
  text?: string
  replyTo?: string
  fromName?: string
  attachments?: Array<{
    filename: string
    content: Buffer | string
    contentType?: string
  }>
}

export interface SendEmailResult {
  success: boolean
  messageId?: string
  error?: string
}

export interface EmailService {
  sendEmail(options: SendEmailOptions): Promise<SendEmailResult>
  isConfigured(): boolean
}

class NoopEmailService implements EmailService {
  async sendEmail(): Promise<SendEmailResult> {
    return { success: false, error: 'Email service not configured' }
  }
  isConfigured(): boolean {
    return false
  }
}

let emailService: EmailService = new NoopEmailService()

export function getEmailService(): EmailService {
  return emailService
}

export function registerEmailService(svc: EmailService): void {
  emailService = svc
}