use std::env;

#[derive(Debug)]
pub struct Config {
    pub database_url: String,
    pub host: String,
    pub port: u16,
    /// Parsed CORS origin policy
    pub cors_origins: CorsOrigins,
}

#[derive(Debug)]
pub enum CorsOrigins {
    /// Allow any origin (`CORS_ALLOWED_ORIGINS=*`)
    Any,
    /// Allow specific origins (`CORS_ALLOWED_ORIGINS=https://a.com,https://b.com`)
    List(Vec<String>),
}

impl Config {
    pub fn from_env() -> Self {
        let database_url = env::var("DATABASE_URL")
            .unwrap_or_else(|_| "sqlite://./pocket-chords.db".into());

        let host = env::var("HOST").unwrap_or_else(|_| "0.0.0.0".into());

        let port = env::var("PORT")
            .ok()
            .and_then(|v| v.parse::<u16>().ok())
            .unwrap_or(8000);

        let cors_origins = match env::var("CORS_ALLOWED_ORIGINS")
            .unwrap_or_else(|_| "*".into())
            .trim()
            .to_string()
        {
            s if s == "*" => CorsOrigins::Any,
            s => CorsOrigins::List(
                s.split(',')
                    .map(|o| o.trim().to_string())
                    .filter(|o| !o.is_empty())
                    .collect(),
            ),
        };

        Self { database_url, host, port, cors_origins }
    }

    pub fn bind_addr(&self) -> String {
        format!("{}:{}", self.host, self.port)
    }
}