use serde::Deserialize;
use std::fs;

#[derive(Deserialize, Clone, Default)]
pub struct Config {
    pub scheme: Option<String>,
    pub port: Option<u16>,
    pub mail: Option<String>,
    pub lang: Option<String>,
}

impl Config {
    fn new() -> Self {
        Self {
            scheme: Some("http".to_string()),
            port: Some(8080),
            ..Config::default()
        }
    }

    fn complete(a: Self) -> Self {
        // Default config
        let d = Config::new();

        /// Return the default value if nothing is value is none
        fn test<T>(val: Option<T>, default: Option<T>) -> Option<T> {
            if val.is_some() {
                val
            } else {
                default
            }
        }

        Self {
            scheme: test(a.scheme, d.scheme),
            port: test(a.port, d.port),
            mail: test(a.mail, d.mail),
            lang: test(a.lang, d.lang),
        }
    }
}

pub fn get_config(file_path: &str) -> Config {
    match fs::read_to_string(file_path) {
        Ok(file) => match toml::from_str(&file) {
            Ok(stored_config) => Config::complete(stored_config),
            Err(file_error) => {
                panic!("Error in config file: {file_error}");
            }
        },
        Err(_) =>
        // No config file
        {
            Config::new()
        }
    }
}