use std::path::{Path, PathBuf};

use clap::Parser;

use crate::constants::{
    APP_NAME, CLIENTS_LIST_FILE, OIDC_PROVIDER_CB_URI, PROVIDERS_LIST_FILE, USERS_LIST_FILE,
};

/// Basic OIDC provider
#[derive(Parser, Debug, Clone)]
#[clap(author, version, about, long_about = None)]
pub struct AppConfig {
    /// Listen address
    #[clap(short, long, env, default_value = "0.0.0.0:8000")]
    pub listen_address: String,

    /// Storage path
    #[clap(short, long, env)]
    pub storage_path: String,

    /// App token token
    #[clap(short, long, env, default_value = "")]
    pub token_key: String,

    /// Website origin
    #[clap(short, long, env, default_value = "http://localhost:8000")]
    pub website_origin: String,

    /// Proxy IP, might end with a star "*"
    #[clap(short, long, env)]
    pub proxy_ip: Option<String>,

    /// IP location service API
    ///
    /// Up instance of IP location service : https://gitlab.com/pierre42100/iplocationserver
    ///
    /// Example: "https://api.geoip.rs"
    #[arg(long, short, env)]
    pub ip_location_service: Option<String>,
}

lazy_static::lazy_static! {
    static ref ARGS: AppConfig = {
        let mut config = AppConfig::parse();

        // In debug mode only, use dummy token
        if cfg!(debug_assertions) && config.token_key.is_empty() {
            config.token_key = String::from_utf8_lossy(&[32; 64]).to_string();
        }

        config
    };
}

impl AppConfig {
    /// Get parsed command line arguments
    pub fn get() -> &'static AppConfig {
        &ARGS
    }

    pub fn secure_cookie(&self) -> bool {
        self.website_origin.starts_with("https:")
    }

    pub fn storage_path(&self) -> &Path {
        self.storage_path.as_ref()
    }

    pub fn users_file(&self) -> PathBuf {
        self.storage_path().join(USERS_LIST_FILE)
    }

    pub fn clients_file(&self) -> PathBuf {
        self.storage_path().join(CLIENTS_LIST_FILE)
    }

    pub fn providers_file(&self) -> PathBuf {
        self.storage_path().join(PROVIDERS_LIST_FILE)
    }

    pub fn full_url(&self, uri: &str) -> String {
        if uri.starts_with('/') {
            format!("{}{}", self.website_origin, uri)
        } else {
            format!("{}/{}", self.website_origin, uri)
        }
    }

    /// Get the URL where a upstream OpenID provider should redirect
    /// the user after an authentication
    pub fn oidc_provider_redirect_url(&self) -> String {
        AppConfig::get().full_url(OIDC_PROVIDER_CB_URI)
    }

    pub fn domain_name(&self) -> &str {
        self.website_origin.split('/').nth(2).unwrap_or(APP_NAME)
    }

    /// Get the domain without the port
    pub fn domain_name_without_port(&self) -> &str {
        let domain = self.domain_name();
        domain.split_once(':').map(|i| i.0).unwrap_or(domain)
    }
}

#[cfg(test)]
mod test {
    use crate::data::app_config::AppConfig;

    #[test]
    fn verify_cli() {
        use clap::CommandFactory;
        AppConfig::command().debug_assert()
    }
}