var typecast = require('../string/typecast');
var isArray = require('../lang/isArray');
var hasOwn = require('../object/hasOwn');

    /**
     * Decode query string into an object of keys => vals.
     */
    function decode(queryStr, shouldTypecast) {
        var queryArr = (queryStr || '').replace('?', '').split('&'),
            reg = /([^=]+)=(.+)/,
            i = -1,
            obj = {},
            equalIndex, cur, pValue, pName;

        while ((cur = queryArr[++i])) {
            equalIndex = cur.indexOf('=');
            pName = cur.substring(0, equalIndex);
            pValue = decodeURIComponent(cur.substring(equalIndex + 1));
            if (shouldTypecast !== false) {
                pValue = typecast(pValue);
            }
            if (hasOwn(obj, pName)){
                if(isArray(obj[pName])){
                    obj[pName].push(pValue);
                } else {
                    obj[pName] = [obj[pName], pValue];
                }
            } else {
                obj[pName] = pValue;
           }
        }
        return obj;
    }

    module.exports = decode;