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// License: see LICENSE file at root directory of `master` branch

//! # Command

use std::{
    fmt,
};

use super::{Cfg, I18n, Opt};

/// # Command
///
/// ## Examples
///
/// ```
/// use dia_args::docs::Cmd;
///
/// // All these constants are convenient while working with Args.
/// // And you can also use them for Cmd.
///
/// const CMD_HELP: &str = "help";
/// const CMD_HELP_DOCS: &str = "Prints help and exits.";
///
/// let _cmd = Cmd::new(CMD_HELP, CMD_HELP_DOCS, None);
/// // Here you can pass this command to Docs::new(...)
/// ```
pub struct Cmd<'a> {
    name: &'a str,
    docs: &'a str,
    options: Option<&'a [&'a Opt<'a>]>,
}

impl<'a> Cmd<'a> {

    /// # Makes new instance
    pub fn new(name: &'a str, docs: &'a str, options: Option<&'a [&'a Opt<'a>]>) -> Self {
        Self {
            name,
            docs,
            options,
        }
    }

    /// # Formats self
    pub fn format(&self, cfg: &Cfg, i18n: &I18n, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        // Name
        let tab = cfg.tab_len().saturating_mul(cfg.tab_level().into());
        f.write_str(&super::format(self.name, tab, cfg.columns()))?;
        f.write_str(super::LINE_BREAK)?;

        // Docs
        let cfg = cfg.increment_level();
        let tab = cfg.tab_len().saturating_mul(cfg.tab_level().into());
        f.write_str(&super::format(self.docs, tab, cfg.columns()))?;
        f.write_str(super::LINE_BREAK)?;

        // Options
        if let Some(options) = self.options {
            f.write_str(&super::format(i18n.options, tab, cfg.columns()))?;
            f.write_str(super::LINE_BREAK)?;

            let cfg = cfg.increment_level();
            for option in options {
                option.format(&cfg, &i18n, f)?;
            }
        }

        Ok(())
    }

}