use camino::Utf8PathBuf;
use clap::Parser;

#[derive(Debug, Parser)]
pub struct Args {
    #[clap(short, long)]
    pub expression: String,

    #[clap(short, long, default_value_t = Utf8PathBuf::from("-"))]
    input: Utf8PathBuf,

    #[clap(short, long, group = "delimiters")]
    lines: bool,

    #[clap(short, long, group = "delimiters", default_value_t = true)]
    words: bool,
}

pub enum InputDelimiter {
    Lines,
    Words,
}

pub enum Input {
    Stdin,
    FilePath(Utf8PathBuf),
}

impl Args {
    pub fn delimiter(&self) -> InputDelimiter {
        if self.lines {
            return InputDelimiter::Lines;
        }

        if self.words {
            return InputDelimiter::Words;
        }

        unreachable!("Either lines or words has to be true")
    }

    pub fn input(&self) -> Input {
        if self.input == "-" {
            Input::Stdin
        } else {
            Input::FilePath(self.input.clone())
        }
    }
}