/**
 * XArgs Parser Module ...
 * a module for parsing args in node js cli apps ...
 * 
 * Maintainer
 * 
 * Hadi Khazaee Asl <https://saherelm.ir> (hadi_khazaee_asl@yahoo.com)
 */

//
//#region Variable/Constants ...
const ARGUMENT_SEPARATION_REGEX = /([^=\s]+)[=\ ]?\s*(.*)/;
//#endregion

//
//#region Actions ...
function parseArgs(argv) {
    //
    // Removing node/bin and called script name
    argv = argv.slice(2);

    //
    const result = {};
    let argName;
    let argValue;

    //
    if (
        argv === null 
        || argv === undefined
        || argv.length === 0
    ) {
        return result;
    }

    //
    const argString = argv.join(" ");
    let matches = argString
        .match(ARGUMENT_SEPARATION_REGEX);
    matches.splice(0, 1);
    matches = matches
        .filter(m => m !== undefined && m !== "");

    //
    matches.forEach(arg => {
        //
        // Separate argument for a key/value return
        arg = arg.match(ARGUMENT_SEPARATION_REGEX);
        arg.splice(0, 1);

        //
        // Retrieve the argument name
        argName = arg[0];

        //
        // Remove "--" or "-"
        if (argName.indexOf('-') === 0) {
            //
            argName = argName
                .slice(
                    argName
                        .slice(0, 2)
                        .lastIndexOf('-') + 1
            );
        }

        //
        // Parse argument value or set it to `true` if empty
        argValue =
            arg[1] !== ''
            ? parseFloat(arg[1])
                .toString() === arg[1]
                ? +arg[1]
                : arg[1]
            : true;
        
        //
        result[argName] = argValue;
    });

    //
    return result;
}
//#endregion

//
//#region Exports ...
module.exports = {
    parseArgs
};
//#endregion