use std::path::PathBuf;

use clap::Parser;
use clap::ValueEnum;

#[derive(Parser, Debug)]
#[command(
    version,
    about,
    long_about = "A compression utility for utf-8 encoded text, \
    using only basic canonical huffman encoding."
)]
pub struct Args {
    /// The input file to be (de)compressed.
    pub input_file: PathBuf,

    /// The optional output file for the resulting (de)compressed output.
    pub output_file: Option<PathBuf>,

    /// Whether to compress or extract.
    #[arg(short, value_enum)]
    pub mode: Option<Mode>,
}

#[derive(Clone, Copy, Debug, ValueEnum, Default)]
pub enum Mode {
    /// Extract
    X,
    #[default]
    /// Compress
    C,
}

impl From<Mode> for clap::builder::OsStr {
    fn from(val: Mode) -> Self {
        match val {
            Mode::X => clap::builder::OsStr::from("x"),
            Mode::C => clap::builder::OsStr::from("c"),
        }
    }
}