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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 std::env;
    use std::path::Path;

    use config::{Config, ConfigError, Environment, File};
    use derive_more::Display;
    #[cfg(not(test))]
    use tracing::warn;

    #[cfg(test)]
    use std::println as warn;

    use serde::Deserialize;
    use serde::Serialize;
    use url::Url;

    use crate::errors::*;

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

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

    #[derive(Deserialize, Serialize, Display, Eq, PartialEq, Clone, Debug)]
    #[serde(rename_all = "lowercase")]
    pub enum DBType {
        #[display(fmt = "postgres")]
        Postgres,
        //    #[display(fmt = "maria")]
        //    Maria,
    }

    impl DBType {
        fn from_url(url: &Url) -> Result<Self, ConfigError> {
            match url.scheme() {
                //        "mysql" => Ok(Self::Maria),
                "postgres" => Ok(Self::Postgres),
                _ => Err(ConfigError::Message("Unknown database type".into())),
            }
        }
    }

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

    #[derive(Debug, Clone, Serialize, Deserialize)]
    pub struct Settings {
        pub allow_registration: bool,
        pub support_email: String,
        pub debug: bool,
        pub server: Server,
        pub source_code: String,
        pub database: Database,
        pub page: PageConfig,
        pub conductors: Vec<Conductor>,
    }

    #[derive(Debug, Clone, Serialize, Deserialize)]
    pub struct Conductor {
        pub username: String,
        pub api_key: String,
        pub url: Url,
    }

    #[derive(Debug, Clone, Serialize, Deserialize)]
    pub struct PageConfig {
        pub base_path: String,
        pub base_domain: String,
    }

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

            const CURRENT_DIR: &str = "./config/default.toml";
            const ETC: &str = "/etc/static-pages/config.toml";

            let mut read_file = false;

            if Path::new(ETC).exists() {
                s = s.add_source(File::with_name(ETC));
                read_file = true;
            }
            if Path::new(CURRENT_DIR).exists() {
                // merging default config from file
                s = s.add_source(File::with_name(CURRENT_DIR));
                read_file = true;
            }

            if let Ok(path) = env::var("PAGES_CONFIG") {
                s = s.add_source(File::with_name(&path));
                read_file = true;
            }

            if !read_file {
                warn!("configuration file not found");
            }

            s = s.add_source(Environment::with_prefix("PAGES").separator("__"));

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

            if let Ok(val) = env::var("DATABASE_URL") {
                let url = Url::parse(&val).expect("couldn't parse Database URL");
                s = s.set_override("database.url", url.to_string()).unwrap();
                let database_type = DBType::from_url(&url).unwrap();
                s = s
                    .set_override("database.database_type", database_type.to_string())
                    .unwrap();
            }

            let intermediate_config = s.build_cloned().unwrap();

            s = s
                .set_override(
                    "database.url",
                    format!(
                        r"postgres://{}:{}@{}:{}/{}",
                        intermediate_config
                            .get::<String>("database.username")
                            .expect("Couldn't access database username"),
                        intermediate_config
                            .get::<String>("database.password")
                            .expect("Couldn't access database password"),
                        intermediate_config
                            .get::<String>("database.hostname")
                            .expect("Couldn't access database hostname"),
                        intermediate_config
                            .get::<String>("database.port")
                            .expect("Couldn't access database port"),
                        intermediate_config
                            .get::<String>("database.name")
                            .expect("Couldn't access database name")
                    ),
                )
                .expect("Couldn't set database url");

            let settings = s.build()?.try_deserialize::<Settings>()?;
            settings.check_url();

            Ok(settings)
        }

        pub fn init(&self) {
            fn create_dir_util(path: &Path) {
                if path.exists() && path.is_file() {
                    panic!("Path is a file, should be a directory: {:?}", path);
                }

                if !path.exists() {
                    std::fs::create_dir_all(path).unwrap();
                }
            }

            create_dir_util(Path::new(&self.page.base_path));
        }

        #[cfg(not(tarpaulin_include))]
        fn check_url(&self) {
            Url::parse(&self.source_code).expect("Please enter a URL for source_code in settings");
        }
    }