import { createTransport } from "nodemailer";

import serverConfig from "@karakeep/shared/config";

export async function sendVerificationEmail(
  email: string,
  name: string,
  token: string,
) {
  if (!serverConfig.email.smtp) {
    throw new Error("SMTP is not configured");
  }

  const transporter = createTransport({
    host: serverConfig.email.smtp.host,
    port: serverConfig.email.smtp.port,
    secure: serverConfig.email.smtp.secure,
    auth:
      serverConfig.email.smtp.user && serverConfig.email.smtp.password
        ? {
            user: serverConfig.email.smtp.user,
            pass: serverConfig.email.smtp.password,
          }
        : undefined,
  });

  const verificationUrl = `${serverConfig.publicUrl}/verify-email?token=${encodeURIComponent(token)}&email=${encodeURIComponent(email)}`;

  const mailOptions = {
    from: serverConfig.email.smtp.from,
    to: email,
    subject: "Verify your email address",
    html: `
      <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
        <h2>Welcome to Karakeep, ${name}!</h2>
        <p>Please verify your email address by clicking the link below:</p>
        <p>
          <a href="${verificationUrl}" style="background-color: #007bff; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; display: inline-block;">
            Verify Email Address
          </a>
        </p>
        <p>If the button doesn't work, you can copy and paste this link into your browser:</p>
        <p><a href="${verificationUrl}">${verificationUrl}</a></p>
        <p>This link will expire in 24 hours.</p>
        <p>If you didn't create an account with us, please ignore this email.</p>
      </div>
    `,
    text: `
Welcome to Karakeep, ${name}!

Please verify your email address by visiting this link:
${verificationUrl}

This link will expire in 24 hours.

If you didn't create an account with us, please ignore this email.
    `,
  };

  await transporter.sendMail(mailOptions);
}

export async function sendInviteEmail(
  email: string,
  token: string,
  inviterName: string,
) {
  if (!serverConfig.email.smtp) {
    throw new Error("SMTP is not configured");
  }

  const transporter = createTransport({
    host: serverConfig.email.smtp.host,
    port: serverConfig.email.smtp.port,
    secure: serverConfig.email.smtp.secure,
    auth:
      serverConfig.email.smtp.user && serverConfig.email.smtp.password
        ? {
            user: serverConfig.email.smtp.user,
            pass: serverConfig.email.smtp.password,
          }
        : undefined,
  });

  const inviteUrl = `${serverConfig.publicUrl}/invite/${encodeURIComponent(token)}`;

  const mailOptions = {
    from: serverConfig.email.smtp.from,
    to: email,
    subject: "You've been invited to join Karakeep",
    html: `
      <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
        <h2>You've been invited to join Karakeep!</h2>
        <p>${inviterName} has invited you to join Karakeep, the bookmark everything app.</p>
        <p>Click the link below to accept your invitation and create your account:</p>
        <p>
          <a href="${inviteUrl}" style="background-color: #007bff; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; display: inline-block;">
            Accept Invitation
          </a>
        </p>
        <p>If the button doesn't work, you can copy and paste this link into your browser:</p>
        <p><a href="${inviteUrl}">${inviteUrl}</a></p>

        <p>If you weren't expecting this invitation, you can safely ignore this email.</p>
      </div>
    `,
    text: `
You've been invited to join Karakeep!

${inviterName} has invited you to join Karakeep, a powerful bookmarking and content organization platform.

Accept your invitation by visiting this link:
${inviteUrl}



If you weren't expecting this invitation, you can safely ignore this email.
    `,
  };

  await transporter.sendMail(mailOptions);
}

export async function sendPasswordResetEmail(
  email: string,
  name: string,
  token: string,
) {
  if (!serverConfig.email.smtp) {
    throw new Error("SMTP is not configured");
  }

  const transporter = createTransport({
    host: serverConfig.email.smtp.host,
    port: serverConfig.email.smtp.port,
    secure: serverConfig.email.smtp.secure,
    auth:
      serverConfig.email.smtp.user && serverConfig.email.smtp.password
        ? {
            user: serverConfig.email.smtp.user,
            pass: serverConfig.email.smtp.password,
          }
        : undefined,
  });

  const resetUrl = `${serverConfig.publicUrl}/reset-password?token=${encodeURIComponent(token)}`;

  const mailOptions = {
    from: serverConfig.email.smtp.from,
    to: email,
    subject: "Reset your password",
    html: `
      <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
        <h2>Password Reset Request</h2>
        <p>Hi ${name},</p>
        <p>You requested to reset your password for your Karakeep account. Click the link below to reset your password:</p>
        <p>
          <a href="${resetUrl}" style="background-color: #007bff; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; display: inline-block;">
            Reset Password
          </a>
        </p>
        <p>If the button doesn't work, you can copy and paste this link into your browser:</p>
        <p><a href="${resetUrl}">${resetUrl}</a></p>
        <p>This link will expire in 1 hour.</p>
        <p>If you didn't request a password reset, please ignore this email. Your password will remain unchanged.</p>
      </div>
    `,
    text: `
Hi ${name},

You requested to reset your password for your Karakeep account. Visit this link to reset your password:
${resetUrl}

This link will expire in 1 hour.

If you didn't request a password reset, please ignore this email. Your password will remain unchanged.
    `,
  };

  await transporter.sendMail(mailOptions);
}

export async function sendListInvitationEmail(
  email: string,
  inviterName: string,
  listName: string,
  listId: string,
) {
  if (!serverConfig.email.smtp) {
    // Silently fail if email is not configured
    return;
  }

  const transporter = createTransport({
    host: serverConfig.email.smtp.host,
    port: serverConfig.email.smtp.port,
    secure: serverConfig.email.smtp.secure,
    auth:
      serverConfig.email.smtp.user && serverConfig.email.smtp.password
        ? {
            user: serverConfig.email.smtp.user,
            pass: serverConfig.email.smtp.password,
          }
        : undefined,
  });

  const inviteUrl = `${serverConfig.publicUrl}/dashboard/lists?pendingInvitation=${encodeURIComponent(listId)}`;

  const mailOptions = {
    from: serverConfig.email.smtp.from,
    to: email,
    subject: `${inviterName} invited you to collaborate on "${listName}"`,
    html: `
      <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
        <h2>You've been invited to collaborate on a list!</h2>
        <p>${inviterName} has invited you to collaborate on the list <strong>"${listName}"</strong> in Karakeep.</p>
        <p>Click the link below to view and accept or decline the invitation:</p>
        <p>
          <a href="${inviteUrl}" style="background-color: #007bff; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; display: inline-block;">
            View Invitation
          </a>
        </p>
        <p>If the button doesn't work, you can copy and paste this link into your browser:</p>
        <p><a href="${inviteUrl}">${inviteUrl}</a></p>
        <p>You can accept or decline this invitation from your Karakeep dashboard.</p>
        <p>If you weren't expecting this invitation, you can safely ignore this email or decline it in your dashboard.</p>
      </div>
    `,
    text: `
You've been invited to collaborate on a list!

${inviterName} has invited you to collaborate on the list "${listName}" in Karakeep.

View your invitation by visiting this link:
${inviteUrl}

You can accept or decline this invitation from your Karakeep dashboard.

If you weren't expecting this invitation, you can safely ignore this email or decline it in your dashboard.
    `,
  };

  await transporter.sendMail(mailOptions);
}