use anyhow::{bail, Result};
use log::info;
use std::env;

#[derive(Debug)]
pub struct Config {
    pub addr: String,
    pub port: u16,
    pub database: String,
    pub threads: Option<u16>,
}

impl Config {
    /// Loads the configuration from environment variables
    pub fn from_env() -> Result<Self> {
        Ok(Self {
            addr: env::var("CR_ADDRESS").unwrap_or_else(|_| {
                info!("Using default address 0.0.0.0");
                "0.0.0.0".to_string()
            }),
            port: match env::var("CR_PORT") {
                Ok(str) => match str.parse() {
                    Ok(port) => port,
                    Err(_) => bail!("Failed to parse environment variable CR_PORT: '{str}' is not a valid port number!"),
                },
                Err(_) => { info!("Using default port 42069"); 42069 }
            },
            database: match env::var("CR_DATABASE") {
                Ok(db) => db,
                Err(_) => bail!("The environment variable CR_DATABASE is required!"),
            },
            threads: match env::var("CR_THREADS") {
                Ok(str) => match str.parse() {
                    Ok(threads) => Some(threads),
                    Err(_) => bail!("Failed to parse environment variable CR_THREAD: '{str}' is not a valid number!"),
                },
                Err(_) => None
            },
        })
    }
}