extern crate serde;
use crate::configuration::config_model::JSONConfiguration;
use std::fs::File;
use std::io::Read;
use std::path::Path;

/**
 * ## Reads configuration from provided file
 * If file does not exist or we cannot read the content of the file,
 * we use the default values
 */
pub fn read(filename: &str) -> serde_json::Result<JSONConfiguration> {
    let mut buffer = String::new();
    let mut config = Ok(JSONConfiguration::default());
    match File::open(filename) {
        Ok(mut file) => {
            file.read_to_string(&mut buffer).unwrap();
            config = serde_json::from_str(&buffer);
            println!(
                "[{}] - Reading {:?}",
                line!(),
                Path::new(filename).file_name()
            );
        }
        Err(_why) => {}
    };
    return config;
}

#[cfg(test)]
mod tests {

    use crate::configuration::reader::*;

    #[test]
    fn get_default_config_if_file_does_not_exist() {
        assert_eq!(read(&"random").unwrap(), JSONConfiguration::default());
    }
}