#[derive(Debug)]
pub enum OptError {
    InvalidOpt(String),
}

#[derive(Clone, Debug)]
pub struct Opt {
    pub name: String,
    pub short: String,
    pub long: String,
    pub(crate) kind: OptKind,
}

impl Opt {
    /// Create a boolean opt that is present or not and does not accept additional arguments
    ///
    /// Example:
    /// ```rust
    /// use arkham::{Opt, App};
    /// App::new().opt(Opt::flag("verbose").short("v").long("verbose"));
    ///```
    pub fn flag(name: &str) -> Self {
        Self {
            name: name.into(),
            short: "".into(),
            long: "".into(),
            kind: OptKind::Flag,
        }
    }

    /// Create a opt that accepts additioanl arguments
    ///
    /// Example:
    /// ```rust
    /// use arkham::{Opt, App};
    /// App::new().opt(Opt::scalar("user").short("u").long("user"));
    ///```
    pub fn scalar(name: &str) -> Self {
        Self {
            name: name.into(),
            short: "".into(),
            long: "".into(),
            kind: OptKind::String,
        }
    }

    /// Sets the short flag that can be used with -x
    ///
    /// Example:
    /// ```rust
    /// use arkham::{Opt, App};
    /// App::new().opt(Opt::scalar("user").short("u").long("user"));
    ///```
    pub fn short(mut self, short: &str) -> Self {
        self.short = short.into();
        self
    }

    /// Sets the long flag that can be used with --xxxxx
    ///
    /// Example:
    /// ```rust
    /// use arkham::{Opt, App};
    /// App::new().opt(Opt::scalar("user").short("u").long("user"));
    ///```
    pub fn long(mut self, long: &str) -> Self {
        self.long = long.into();
        self
    }
}

#[derive(Clone, Debug)]
pub(crate) enum OptKind {
    Flag,
    String,
}

#[derive(Clone, Debug)]
pub(crate) struct ActiveOpt {
    pub definition: Opt,
    pub raw_value: Vec<String>,
}

impl ActiveOpt {
    pub fn new(definition: Opt, raw_value: Vec<String>) -> Self {
        ActiveOpt {
            definition,
            raw_value,
        }
    }
}