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

/// Solar system central backend
#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
pub struct AppConfig {
    /// The path to the file to write to update the value
    #[clap(short, long, default_value = "/dev/shm/consumption.txt")]
    file_path: String,

    /// Minimal value
    #[clap( long, default_value_t = -5000)]
    pub min: i64,

    /// Maximal value
    #[clap(long, default_value_t = 5000)]
    pub max: i64,

    /// Minimum interval between two persistence (milliseconds)
    #[clap(long, default_value_t = 500)]
    pub min_save_interval: u128,
}

lazy_static::lazy_static! {
    static ref ARGS: AppConfig = {
        AppConfig::parse()
    };
}

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

    /// Path to the file to update the value
    pub fn file_path(&self) -> PathBuf {
        Path::new(&self.file_path).to_path_buf()
    }
}

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

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