import nodemailer from "nodemailer";

// Configure transport based on environment
const transporter = nodemailer.createTransport({
  host: process.env.SMTP_HOST || "localhost",
  port: parseInt(process.env.SMTP_PORT || "1025"),
  secure: process.env.SMTP_SECURE === "true",
  auth: process.env.SMTP_USER && process.env.SMTP_PASS
    ? {
        user: process.env.SMTP_USER,
        pass: process.env.SMTP_PASS,
      }
    : undefined, // MailHog doesn't need auth in dev
});

export async function sendVerificationEmail(
  to: string,
  name: string,
  token: string,
): Promise<boolean> {
  const baseUrl = process.env.APP_URL || `http://localhost:${process.env.PORT || 3000}`;
  const verifyUrl = `${baseUrl}/verify?token=${token}`;

  const mailOptions: Record<string, unknown> = {
    from: process.env.SMTP_FROM || `"GammaDesk" <noreply@gammanexus.io>`,
    to,
    subject: "Verify your GammaDesk account",
    text: `GammaDesk - Verify Your Account\n\nHello ${name},\n\nThanks for signing up! Please verify your email by visiting:\n\n${verifyUrl}\n\nThis link expires in 24 hours. If you didn't create this account, you can safely ignore this email.`,
    html: `
      <div style="font-family: system-ui, -apple-system, sans-serif; max-width: 480px; margin: 0 auto; padding: 24px;">
        <h1 style="color: #333; margin-bottom: 16px;">Welcome to GammaDesk, ${name}!</h1>
        <p style="color: #666; line-height: 1.6; margin-bottom: 24px;">
          Thanks for signing up. Please verify your email address by clicking the button below.
        </p>
        <a href="${verifyUrl}" style="display: inline-block; padding: 12px 24px; background: #22c55e; color: white; text-decoration: none; border-radius: 8px; font-weight: 600;">
          Verify Email Address
        </a>
        <p style="color: #999; font-size: 12px; margin-top: 24px;">
          This link will expire in 24 hours.<br/>
          If you didn't create this account, you can safely ignore this email.
        </p>
      </div>
    `,
  };

  try {
    await transporter.sendMail(mailOptions);
    console.log(`[Email] Verification email sent to ${to}`);
    return true;
  } catch (error) {
    console.error("[Email] Failed to send verification email:", error);
    return false;
  }
}