use dotenvy::var;
use lettre::{
    message::{header::ContentType, Mailbox},
    transport::smtp::authentication::Credentials,
    Message, SmtpTransport, Transport,
};

fn create_mailer() -> SmtpTransport {
    // Get the server settings from the env file
    let smtp_server_name = var("SMTP_SERVER_NAME").expect("SMTP_SERVER_NAME not set");
    let smtp_server_port = var("SMTP_SERVER_PORT").expect("SMTP_SERVER_PORT not set");

    // Get the username and password from the env file
    let username = var("EMAIL_USERNAME").expect("EMAIL_USERNAME not set");
    let password = var("EMAIL_PASSWORD").expect("EMAIL_PASSWORD not set");

    // Create the credentials
    let creds = Credentials::new(username, password);

    // Create a connection to our email provider
    // In this case, we are using Namecheap's Private Email
    // You can use any email provider you want
    SmtpTransport::relay(&smtp_server_name)
        .unwrap()
        .credentials(creds)
        .build()
}

pub fn send_email(subject: String, recipient: String, body: String) {
    let username = var("EMAIL_USERNAME").expect("EMAIL_USERNAME not set");

    // Build the email
    let email = Message::builder()
        .from(username.parse::<Mailbox>().unwrap())
        .to(recipient.parse::<Mailbox>().unwrap())
        .subject(subject)
        .header(ContentType::TEXT_HTML)
        .body(body.to_string())
        .unwrap();

    let mailer = create_mailer();

    // Send the email
    match mailer.send(&email) {
        Ok(_) => println!("Basic email sent!"),
        Err(error) => {
            println!("Basic email failed to send. {:?}", error);
        }
    }
}

pub fn send_emails(subject: String, recipients: Vec<String>, body: String) {
    let username = var("EMAIL_USERNAME").expect("EMAIL_USERNAME not set");

    // Build the email
    let mut email = Message::builder()
        .from(username.parse::<Mailbox>().unwrap())
        .subject(subject)
        .header(ContentType::TEXT_HTML)
        .body(body);

        for recipient in recipients {
            email = email.to(recipient.parse::<Mailbox>().unwrap());
        }    
}