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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/>.
     */
    use crate::AppCtx;

    pub struct Preview<'a> {
        pub base: &'a str,
        pub delimiter: &'static str,
        pub prefix: &'static str,
    }

    impl<'a> Preview<'a> {
        pub fn new(ctx: &'a AppCtx) -> Self {
            Self {
                base: &ctx.settings.page.base_domain,
                delimiter: ".",
                prefix: "deploy-preview-",
            }
        }
        pub fn get_name(&self, preview_number: usize) -> String {
            format!(
                "{}{preview_number}{}{}",
                self.prefix, self.delimiter, self.base
            )
        }

        pub fn extract(&self, hostname: &'a str) -> Option<&'a str> {
            if !hostname.contains(self.delimiter)
                || !hostname.contains(self.prefix)
                || !hostname.contains(self.base)
            {
                return None;
            }

            let d = format!("{}{}", self.delimiter, self.base);

            if hostname.split(&d).count() == 2 {
                return hostname.split(&d).next();
            }
            None
        }
    }

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

        #[test]
        fn preview_extract_generate_works() {
            const BASE_DOMAIN: &str = "librepages.site";
            const PREVIEW_DELIMITER: &str = ".";
            const PREVIEW_PREFIX: &str = "deploy-preview-";
            const PREVIEW_NUMBER: usize = 1666;

            let preview_hostname =
                format!("{PREVIEW_PREFIX}{PREVIEW_NUMBER}{PREVIEW_DELIMITER}{BASE_DOMAIN}");

            let bad_hostname = BASE_DOMAIN.to_string();

            let extractor = Preview {
                base: BASE_DOMAIN,
                prefix: PREVIEW_PREFIX,
                delimiter: PREVIEW_DELIMITER,
            };

            assert_eq!(extractor.get_name(PREVIEW_NUMBER), preview_hostname);

            assert_eq!(extractor.extract(&bad_hostname), None);

            assert_eq!(
                extractor.extract(&format!(
                    "{PREVIEW_PREFIX}{PREVIEW_NUMBER}{PREVIEW_DELIMITER}no_base_domain"
                )),
                None
            );

            assert_eq!(
                extractor.extract(&format!(
                    "{PREVIEW_PREFIX}{PREVIEW_NUMBER}no-delimiter{BASE_DOMAIN}"
                )),
                None
            );

            assert_eq!(
                extractor.extract(&format!(
                    "{PREVIEW_PREFIX}{PREVIEW_NUMBER}no-delimiter{BASE_DOMAIN}"
                )),
                None
            );

            assert_eq!(
                extractor.extract(&format!(
                    "noprefix{PREVIEW_NUMBER}{PREVIEW_DELIMITER}{BASE_DOMAIN}"
                )),
                None
            );

            assert_eq!(
                extractor.extract(&preview_hostname),
                Some(format!("{PREVIEW_PREFIX}{PREVIEW_NUMBER}").as_str())
            );
        }
    }