import nodemailer from 'nodemailer'

interface EmailOptions {
  to: string | string[]
  subject: string
  text?: string
  html?: string
  from?: string
  replyTo?: string
}

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

class SMTPService {
  private transporter: any

  constructor() {
    // Configure nodemailer to use local Maddy SMTP server
    this.transporter = nodemailer.createTransport({
      host: 'localhost',
      port: 25,
      secure: false, // Use STARTTLS
      tls: {
        rejectUnauthorized: false // Accept self-signed certificates
      },
      // Maddy accepts mail on port 25 without authentication for localhost
      requireTLS: false
    })
  }

  async sendEmail(options: EmailOptions): Promise<SendEmailResult> {
    try {
      const mailOptions = {
        from: options.from || 'Biblical Guide <no-reply@biblical-guide.com>',
        to: Array.isArray(options.to) ? options.to.join(', ') : options.to,
        subject: options.subject,
        text: options.text,
        html: options.html,
        replyTo: options.replyTo
      }

      const info = await this.transporter.sendMail(mailOptions)

      return {
        success: true,
        messageId: info.messageId
      }
    } catch (error) {
      console.error('SMTP send error:', error)
      return {
        success: false,
        error: error instanceof Error ? error.message : 'Unknown error'
      }
    }
  }

  async sendContactForm(data: {
    name: string
    email: string
    subject: string
    message: string
  }): Promise<SendEmailResult> {
    const html = `
      <h2>New Contact Form Submission</h2>
      <p><strong>Name:</strong> ${data.name}</p>
      <p><strong>Email:</strong> ${data.email}</p>
      <p><strong>Subject:</strong> ${data.subject}</p>
      <p><strong>Message:</strong></p>
      <div style="background: #f5f5f5; padding: 15px; border-radius: 5px;">
        ${data.message.replace(/\n/g, '<br>')}
      </div>
    `

    const text = `
New Contact Form Submission

Name: ${data.name}
Email: ${data.email}
Subject: ${data.subject}

Message:
${data.message}
    `

    return this.sendEmail({
      to: 'contact@biblical-guide.com',
      subject: `Contact Form: ${data.subject}`,
      html,
      text,
      replyTo: data.email
    })
  }

  async testConnection(): Promise<{ success: boolean; error?: string }> {
    try {
      await this.transporter.verify()
      return { success: true }
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : 'Connection failed'
      }
    }
  }
}

export const smtpService = new SMTPService()