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    /*
    * Copyright (C) 2022  Aravinth Manivannan <realaravinth@batsense.net>
    *
    * This program is free software: you can redistribute it and/or modify
    * it under the terms of the GNU Affero General Public License as
    * published by the Free Software Foundation, either version 3 of the
    * License, or (at your option) any later version.
    *
    * This program is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    * GNU Affero General Public License for more details.
    *
    * You should have received a copy of the GNU Affero General Public License
    * along with this program.  If not, see <https://www.gnu.org/licenses/>.
    */
    //! Email operations: verification, notification, etc
    use lettre::{
        message::{header, MultiPart, SinglePart},
        AsyncTransport, Message,
    };
    use sailfish::TemplateOnce;

    use crate::errors::*;
    use crate::Data;
    use crate::SETTINGS;

    const PAGE: &str = "Login";

    #[derive(Clone, TemplateOnce)]
    #[template(path = "email/verification/index.html")]
    struct IndexPage<'a> {
        verification_link: &'a str,
    }

    impl<'a> IndexPage<'a> {
        fn new(verification_link: &'a str) -> Self {
            Self { verification_link }
        }
    }

    async fn verification(
        data: &Data,
        to: &str,
        verification_link: &str,
    ) -> ServiceResult<()> {
        if let Some(smtp) = SETTINGS.smtp.as_ref() {
            let from = format!("mCaptcha Admin <{}>", smtp.from);
            let reply_to = format!("mCaptcha Admin <{}>", smtp.reply);
            const SUBJECT: &str = "[mCaptcha] Please verify your email";

            let plain_text = format!(
                "
    Welcome to mCaptcha!

    Please verify your email address to continue.

    VERIFICATION LINK: {}

    Please ignore this email if you weren't expecting it.

    With best regards,
    Admin
    instance: {}
    project website: {}",
                verification_link,
                SETTINGS.server.domain,
                crate::PKG_HOMEPAGE
            );

            let html = IndexPage::new(verification_link).render_once().unwrap();

            let email = Message::builder()
                .from(from.parse().unwrap())
                .reply_to(reply_to.parse().unwrap())
                .to(to.parse().unwrap())
                .subject(SUBJECT)
                .multipart(
                    MultiPart::alternative() // This is composed of two parts.
                        .singlepart(
                            SinglePart::builder()
                                .header(header::ContentType::TEXT_PLAIN)
                                .body(plain_text), // Every message should have a plain text fallback.
                        )
                        .singlepart(
                            SinglePart::builder()
                                .header(header::ContentType::TEXT_HTML)
                                .body(html),
                        ),
                )
                .unwrap();

            data.mailer.as_ref().unwrap().send(email).await?;
        }
        Ok(())
    }

    #[cfg(test)]
    mod tests {
        use super::*;

        use awc::Client;

        #[actix_rt::test]
        async fn email_verification_works() {
            const TO_ADDR: &str = "Hello <realaravinth@localhost>";
            const VERIFICATION_LINK: &str = "https://localhost";
            let data = Data::new().await;
            verification(&data, TO_ADDR, VERIFICATION_LINK)
                .await
                .unwrap();

            let client = Client::default();
            let mut resp = client
                .get("http://localhost:1080/email")
                .send()
                .await
                .unwrap();
            let data: serde_json::Value = resp.json().await.unwrap();
            let data = &data[0];
            let smtp = SETTINGS.smtp.as_ref().unwrap();

            let from_addr = &data["headers"]["from"];

            assert!(from_addr.to_string().contains(&smtp.from));

            let body = &data["html"];
            assert!(body.to_string().contains(VERIFICATION_LINK));
        }
    }