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/* Pirate - A command-line arrrrguments parser, written in Rust.
 * Copyright (C) 2015 Zachary Dziura
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

pub mod errors;
pub mod matches;
mod opts;

use std::env::Args;

pub use errors::ErrorKind;
pub use matches::Matches;
use opts::Opts;

pub fn parse(mut args: Args, options: &[&'static str]) -> Result<Matches, errors::ErrorKind> {
    let mut matches: Matches = Matches::new();

    let mut opts: Opts = opts(options); // Jesus, this is redundant...

    args.next(); // Remove the program name from the list of program arguments
    
    let mut next_arg = args.next();
    while next_arg.is_some() {
        let mut current_arg = next_arg.unwrap();
        let arg: String;

        if &current_arg[..1] == "-" { // Probably a opt
            if current_arg.len() == 2 { // Short form opt
                arg = String::from(&current_arg[1..]);
            } else { // Assuming it's a long form opt
                //TODO: Handle cases where it may be a opt group
                arg = String::from(&current_arg[2..]);
            }

            if opts.contains_opt(&arg) {
                let has_arg: bool = *opts.get_opt(&arg).unwrap();

                if has_arg {
                    // NOTE: The corresponding arg MUST be immediately following
                    current_arg = match args.next() {
                        None => {
                            return Err(ErrorKind::MissingArgument);
                        },
                        Some(a) => a
                    };
                    
                    matches.insert(&arg, &current_arg);
                } else {
                    matches.insert(&arg, "");
                }
            } else {
                return Err(ErrorKind::InvalidOption);
            }

        } else { // Probably a required arg
            let arg_name: String = opts.get_arg().unwrap();
            matches.insert(&arg_name, &current_arg);
        }

        next_arg = args.next();
    }

    Ok(matches)
}

fn opts(opts: &[&'static str]) -> Opts {
    let mut options = Opts::new();

    for opt in opts.iter() {
        let is_arg: bool = match &opt[..1] {
            ":" => true,
            _ => false
        };

        let has_arg: bool = match &opt[(opt.len() - 1)..] {
            ":" => true,
            _ => false
        };

        if is_arg {
            options.insert_arg(&opt[1..]);
        } else {
            let option: &str;

            if has_arg {
              option = &opt[..(opt.len() - 1)];
            } else {
                option = *opt;
            }

            for form in option.split("/") {
                options.insert_opt(form, has_arg);
            }
        }
    }

    // Push the obligatory "-h/--help" options
    options.insert_opt("h", false);
    options.insert_opt("help", false);

    options
}