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    /*
    * Copyright (C) 2021  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 std::env;
    use std::path::Path;

    use config::{Config, ConfigError, Environment, File};
    use log::debug;
    use serde::Deserialize;
    use url::Url;

    #[derive(Debug, Clone, Deserialize)]
    pub struct Server {
        pub allow_registration: bool,
        pub port: u32,
        pub domain: String,
        pub cookie_secret: String,
        pub ip: String,
        pub url_prefix: Option<String>,
    }

    #[derive(Debug, Clone, Deserialize)]
    pub struct Captcha {
        pub salt: String,
        pub gc: u64,
    }

    impl Server {
        #[cfg(not(tarpaulin_include))]
        pub fn get_ip(&self) -> String {
            format!("{}:{}", self.ip, self.port)
        }
    }

    #[derive(Debug, Clone, Deserialize)]
    struct DatabaseBuilder {
        pub port: u32,
        pub hostname: String,
        pub username: String,
        pub password: String,
        pub name: String,
        pub url: String,
    }

    impl DatabaseBuilder {
        #[cfg(not(tarpaulin_include))]
        fn extract_database_url(url: &Url) -> Self {
            debug!("Databse name: {}", url.path());
            let mut path = url.path().split("/");
            path.next();
            let name = path.next().expect("no database name").to_string();
            DatabaseBuilder {
                port: url.port().expect("Enter database port").into(),
                hostname: url.host().expect("Enter database host").to_string(),
                username: url.username().into(),
                url: url.to_string(),
                password: url.password().expect("Enter database password").into(),
                name,
            }
        }
    }

    #[derive(Debug, Clone, Deserialize)]
    pub struct Database {
        pub url: String,
        pub pool: u32,
    }

    #[derive(Debug, Clone, Deserialize)]
    pub struct Settings {
        pub debug: bool,
        pub database: Database,
        pub server: Server,
        pub pow: Captcha,
        pub source_code: String,
    }

    #[cfg(not(tarpaulin_include))]
    impl Settings {
        pub fn new() -> Result<Self, ConfigError> {
            let mut s = Config::new();

            // setting default values
            #[cfg(test)]
            s.set_default("database.pool", 2.to_string())
                .expect("Couldn't get the number of CPUs");

            const CURRENT_DIR: &str = "./config/default.toml";
            const ETC: &str = "/etc/guard/config.toml";

            if let Ok(path) = env::var("GUARD_CONFIG") {
                s.merge(File::with_name(&path))?;
            } else if Path::new(CURRENT_DIR).exists() {
                // merging default config from file
                s.merge(File::with_name(CURRENT_DIR))?;
            } else if Path::new(ETC).exists() {
                s.merge(File::with_name(ETC))?;
            } else {
                log::warn!("configuration file not found");
            }

            s.merge(Environment::with_prefix("GUARD").separator("_"))?;

            check_url(&s);

            match env::var("PORT") {
                Ok(val) => {
                    s.set("server.port", val).unwrap();
                }
                Err(e) => println!("couldn't interpret PORT: {}", e),
            }

            match env::var("DATABASE_URL") {
                Ok(val) => {
                    let url = Url::parse(&val).expect("couldn't parse Database URL");
                    let database_conf = DatabaseBuilder::extract_database_url(&url);
                    set_from_database_url(&mut s, &database_conf);
                }
                Err(e) => println!("couldn't interpret DATABASE_URL: {}", e),
            }

            set_database_url(&mut s);

            match s.try_into() {
                Ok(val) => Ok(val),
                Err(e) => Err(ConfigError::Message(format!("\n\nError: {}. If it says missing fields, then please refer to https://github.com/mCaptcha/guard#configuration to learn more about how guard reads configuration\n\n", e)))?,
            }
        }
    }

    #[cfg(not(tarpaulin_include))]
    fn check_url(s: &Config) {
        let url = s
            .get::<String>("source_code")
            .expect("Couldn't access source_code");

        Url::parse(&url).expect("Please enter a URL for source_code in settings");
    }

    #[cfg(not(tarpaulin_include))]
    fn set_from_database_url(s: &mut Config, database_conf: &DatabaseBuilder) {
        s.set("database.username", database_conf.username.clone())
            .expect("Couldn't set database username");
        s.set("database.password", database_conf.password.clone())
            .expect("Couldn't access database password");
        s.set("database.hostname", database_conf.hostname.clone())
            .expect("Couldn't access database hostname");
        s.set("database.port", database_conf.port as i64)
            .expect("Couldn't access database port");
        s.set("database.name", database_conf.name.clone())
            .expect("Couldn't access database name");
    }

    #[cfg(not(tarpaulin_include))]
    fn set_database_url(s: &mut Config) {
        s.set(
            "database.url",
            format!(
                r"postgres://{}:{}@{}:{}/{}",
                s.get::<String>("database.username")
                    .expect("Couldn't access database username"),
                s.get::<String>("database.password")
                    .expect("Couldn't access database password"),
                s.get::<String>("database.hostname")
                    .expect("Couldn't access database hostname"),
                s.get::<String>("database.port")
                    .expect("Couldn't access database port"),
                s.get::<String>("database.name")
                    .expect("Couldn't access database name")
            ),
        )
        .expect("Couldn't set databse url");
    }

    //#[cfg(test)]
    //mod tests {
    //    use super::*;
    //
    //    #[test]
    //    fn url_prefix_test() {
    //        let mut settings = Settings::new().unwrap();
    //        assert!(settings.server.url_prefix.is_none());
    //        settings.server.url_prefix = Some("test".into());
    //        settings.server.check_url_prefix();
    //        settings.server.url_prefix = Some("    ".into());
    //        settings.server.check_url_prefix();
    //        assert!(settings.server.url_prefix.is_none());
    //    }
    //}