use reqwest::Client;
use serde::{Deserialize, Serialize};
use thiserror::Error;
#[derive(Error, Debug)]
pub enum EmailError {
#[error("Failed to send email: {0}")]
SendError(String),
#[error("HTTP request failed: {0}")]
HttpError(#[from] reqwest::Error),
#[error("Email service not configured - RESEND_API_KEY not set")]
NotConfigured,
}
#[derive(Debug, Serialize)]
struct ResendEmailRequest {
from: String,
to: Vec<String>,
subject: String,
html: String,
}
#[derive(Debug, Deserialize)]
struct ResendEmailResponse {
id: String,
}
pub struct EmailService {
api_key: Option<String>,
client: Client,
from_email: String,
}
impl EmailService {
pub fn new(api_key: Option<String>) -> Self {
Self {
api_key,
client: Client::new(),
from_email: "AxonML <noreply@automatanexus.com>".to_string(),
}
}
pub fn is_configured(&self) -> bool {
self.api_key.is_some()
}
pub async fn send_verification_email(
&self,
to_email: &str,
user_name: &str,
verification_token: &str,
base_url: &str,
) -> Result<(), EmailError> {
let verify_url = format!(
"{}/api/auth/verify-email?token={}",
base_url, verification_token
);
let html = format!(
r#"
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Verify Your Email - AxonML</title>
</head>
<body style="font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #111827; max-width: 600px; margin: 0 auto; padding: 20px; background-color: #faf9f6;">
<div style="background-color: #ffffff; border-radius: 12px; padding: 40px; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);">
<div style="text-align: center; margin-bottom: 30px;">
<h1 style="color: #14b8a6; font-size: 32px; margin: 0;">AxonML</h1>
</div>
<h2 style="color: #111827; font-size: 24px; margin-bottom: 16px;">Welcome to AxonML, {}!</h2>
<p style="color: #6b7280; font-size: 16px; margin-bottom: 24px;">
Thank you for signing up! Please verify your email address to continue. Once verified,
an administrator will review and approve your account.
</p>
<div style="text-align: center; margin: 32px 0;">
<a href="{}" style="display: inline-block; background-color: #14b8a6; color: #ffffff; text-decoration: none; padding: 14px 32px; border-radius: 8px; font-weight: 600; font-size: 16px;">
Verify Email Address
</a>
</div>
<p style="color: #9ca3af; font-size: 14px; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb;">
If the button doesn't work, copy and paste this link into your browser:<br>
<a href="{}" style="color: #14b8a6; word-break: break-all;">{}</a>
</p>
<p style="color: #9ca3af; font-size: 14px; margin-top: 16px;">
If you didn't create an account with AxonML, you can safely ignore this email.
</p>
<div style="text-align: center; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb;">
<p style="color: #9ca3af; font-size: 12px; margin: 4px 0;">
Secured by AutomataNexus
</p>
<p style="color: #9ca3af; font-size: 12px; margin: 4px 0;">
© 2026 AxonML. All rights reserved.
</p>
</div>
</div>
</body>
</html>
"#,
user_name, verify_url, verify_url, verify_url
);
self.send_email(to_email, "Verify Your Email - AxonML", &html)
.await
}
pub async fn send_admin_signup_notification(
&self,
user_email: &str,
user_name: &str,
) -> Result<(), EmailError> {
let html = format!(
r#"
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>New User Signup - AxonML</title>
</head>
<body style="font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #111827; max-width: 600px; margin: 0 auto; padding: 20px; background-color: #faf9f6;">
<div style="background-color: #ffffff; border-radius: 12px; padding: 40px; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);">
<div style="text-align: center; margin-bottom: 30px;">
<h1 style="color: #14b8a6; font-size: 32px; margin: 0;">AxonML</h1>
</div>
<h2 style="color: #111827; font-size: 24px; margin-bottom: 16px;">New User Signup</h2>
<p style="color: #6b7280; font-size: 16px; margin-bottom: 24px;">
A new user has registered for AxonML and is awaiting email verification:
</p>
<div style="background-color: #f0fdfa; border-left: 4px solid #14b8a6; padding: 16px; margin: 24px 0; border-radius: 4px;">
<p style="margin: 8px 0;"><strong>Name:</strong> {}</p>
<p style="margin: 8px 0;"><strong>Email:</strong> {}</p>
</div>
<p style="color: #6b7280; font-size: 14px; margin-top: 24px;">
Once the user verifies their email, you'll receive another notification to approve their access.
</p>
<div style="text-align: center; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb;">
<p style="color: #9ca3af; font-size: 12px; margin: 4px 0;">
Secured by AutomataNexus
</p>
</div>
</div>
</body>
</html>
"#,
user_name, user_email
);
self.send_email(
"devops@automatanexus.com",
"New User Signup - AxonML",
&html,
)
.await
}
pub async fn send_admin_approval_request(
&self,
user_id: &str,
user_email: &str,
user_name: &str,
user_location: Option<&str>,
user_ip: Option<&str>,
approval_token: &str,
base_url: &str,
) -> Result<(), EmailError> {
let approval_url = format!(
"{}/api/auth/approve-user?token={}",
base_url, approval_token
);
let location_info = user_location.unwrap_or("Unknown");
let ip_info = user_ip.unwrap_or("Unknown");
let html = format!(
r#"
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>User Approval Required - AxonML</title>
</head>
<body style="font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #111827; max-width: 600px; margin: 0 auto; padding: 20px; background-color: #faf9f6;">
<div style="background-color: #ffffff; border-radius: 12px; padding: 40px; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);">
<div style="text-align: center; margin-bottom: 30px;">
<h1 style="color: #14b8a6; font-size: 32px; margin: 0;">AxonML</h1>
</div>
<h2 style="color: #111827; font-size: 24px; margin-bottom: 16px;">User Approval Required</h2>
<p style="color: #6b7280; font-size: 16px; margin-bottom: 24px;">
A user has verified their email address and is requesting access to AxonML:
</p>
<div style="background-color: #f0fdfa; border-left: 4px solid #14b8a6; padding: 16px; margin: 24px 0; border-radius: 4px;">
<p style="margin: 8px 0;"><strong>Username:</strong> {}</p>
<p style="margin: 8px 0;"><strong>Email:</strong> {}</p>
<p style="margin: 8px 0;"><strong>Full Name:</strong> {}</p>
<p style="margin: 8px 0;"><strong>Location:</strong> {}</p>
<p style="margin: 8px 0;"><strong>IP Address:</strong> {}</p>
<p style="margin: 8px 0;"><strong>User ID:</strong> {}</p>
</div>
<div style="text-align: center; margin: 32px 0;">
<a href="{}" style="display: inline-block; background-color: #14b8a6; color: #ffffff; text-decoration: none; padding: 14px 32px; border-radius: 8px; font-weight: 600; font-size: 16px;">
Permit {} Access
</a>
</div>
<p style="color: #9ca3af; font-size: 14px; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb;">
If the button doesn't work, copy and paste this link into your browser:<br>
<a href="{}" style="color: #14b8a6; word-break: break-all;">{}</a>
</p>
<div style="text-align: center; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb;">
<p style="color: #9ca3af; font-size: 12px; margin: 4px 0;">
Secured by AutomataNexus
</p>
</div>
</div>
</body>
</html>
"#,
user_name,
user_email,
user_name,
location_info,
ip_info,
user_id,
approval_url,
user_name,
approval_url,
approval_url
);
self.send_email(
"devops@automatanexus.com",
&format!("Approval Required: {} - AxonML", user_name),
&html,
)
.await
}
pub async fn send_welcome_email(
&self,
to_email: &str,
user_name: &str,
dashboard_url: &str,
) -> Result<(), EmailError> {
let html = format!(
r#"
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Welcome to AxonML</title>
</head>
<body style="font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #111827; max-width: 600px; margin: 0 auto; padding: 20px; background-color: #faf9f6;">
<div style="background-color: #ffffff; border-radius: 12px; padding: 40px; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);">
<div style="text-align: center; margin-bottom: 30px;">
<h1 style="color: #14b8a6; font-size: 32px; margin: 0;">AxonML</h1>
</div>
<h2 style="color: #111827; font-size: 24px; margin-bottom: 16px;">Welcome, {}!</h2>
<p style="color: #6b7280; font-size: 16px; margin-bottom: 24px;">
Your account has been approved! You can now access the AxonML platform and start
building amazing ML models.
</p>
<div style="text-align: center; margin: 32px 0;">
<a href="{}" style="display: inline-block; background-color: #14b8a6; color: #ffffff; text-decoration: none; padding: 14px 32px; border-radius: 8px; font-weight: 600; font-size: 16px;">
Access Dashboard
</a>
</div>
<div style="background-color: #f0fdfa; border-left: 4px solid #14b8a6; padding: 16px; margin: 24px 0; border-radius: 4px;">
<h3 style="color: #111827; font-size: 16px; margin-top: 0;">Getting Started</h3>
<ul style="color: #6b7280; font-size: 14px; margin: 0; padding-left: 20px;">
<li>Explore the training dashboard</li>
<li>Upload your first model</li>
<li>Deploy inference endpoints</li>
<li>Monitor metrics and performance</li>
</ul>
</div>
<p style="color: #6b7280; font-size: 14px; margin-top: 24px;">
If you have any questions, feel free to reach out to our support team.
</p>
<div style="text-align: center; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb;">
<p style="color: #9ca3af; font-size: 12px; margin: 4px 0;">
Secured by AutomataNexus
</p>
<p style="color: #9ca3af; font-size: 12px; margin: 4px 0;">
© 2026 AxonML. All rights reserved.
</p>
</div>
</div>
</body>
</html>
"#,
user_name, dashboard_url
);
self.send_email(
to_email,
"Welcome to AxonML - Your Account is Active!",
&html,
)
.await
}
async fn send_email(&self, to: &str, subject: &str, html: &str) -> Result<(), EmailError> {
let api_key = self.api_key.as_ref().ok_or(EmailError::NotConfigured)?;
let request = ResendEmailRequest {
from: self.from_email.clone(),
to: vec![to.to_string()],
subject: subject.to_string(),
html: html.to_string(),
};
let response = self
.client
.post("https://api.resend.com/emails")
.header("Authorization", format!("Bearer {}", api_key))
.header("Content-Type", "application/json")
.json(&request)
.send()
.await?;
if !response.status().is_success() {
let error_text = response
.text()
.await
.unwrap_or_else(|_| "Unknown error".to_string());
return Err(EmailError::SendError(error_text));
}
let result: ResendEmailResponse = response.json().await?;
tracing::debug!(email_id = %result.id, to = to, "Email sent successfully");
Ok(())
}
}