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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::fs;
    use std::path::Path;

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

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

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

    #[derive(Debug, Clone, Deserialize)]
    pub struct Settings {
        pub debug: bool,
        pub cache: Option<String>,
        pub server: Server,
        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/libmedium/config.toml";

            if let Ok(path) = env::var("LIBMEDIUM") {
                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("PAGES").separator("__"))?;

            check_url(&s);

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

            let mut settings: Settings = s.try_into()?;

            if settings.cache.is_none() {
                let tmp = env::temp_dir().join("libmedium_cache_path");
                if !tmp.exists() {
                    fs::create_dir_all(&tmp).unwrap()
                }
                settings.cache = Some(tmp.to_str().unwrap().to_string())
            }

            let cache_path = settings.cache.as_ref().unwrap();
            let cache_path = Path::new(&cache_path);
            if !cache_path.exists() {
                fs::create_dir(&cache_path).unwrap();
            }
            if !cache_path.is_dir() {
                panic!(
                    "Cache path {} must be a directory",
                    &settings.cache.as_ref().unwrap()
                );
            }
            Ok(settings)
        }
    }

    #[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");
    }