import isFunction from '../utils/is-function'; import extend from '../utils/extend'; import isObject from '../utils/is-object'; import hasOwnProp from '../utils/has-own-prop';

export function set (config) {

var prop, i;
for (i in config) {
    prop = config[i];
    if (isFunction(prop)) {
        this[i] = prop;
    } else {
        this['_' + i] = prop;
    }
}
this._config = config;
// Lenient ordinal parsing accepts just a number in addition to
// number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
// TODO: Remove "ordinalParse" fallback in next major release.
this._dayOfMonthOrdinalParseLenient = new RegExp(
    (this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) +
        '|' + (/\d{1,2}/).source);

}

export function mergeConfigs(parentConfig, childConfig) {

var res = extend({}, parentConfig), prop;
for (prop in childConfig) {
    if (hasOwnProp(childConfig, prop)) {
        if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
            res[prop] = {};
            extend(res[prop], parentConfig[prop]);
            extend(res[prop], childConfig[prop]);
        } else if (childConfig[prop] != null) {
            res[prop] = childConfig[prop];
        } else {
            delete res[prop];
        }
    }
}
for (prop in parentConfig) {
    if (hasOwnProp(parentConfig, prop) &&
            !hasOwnProp(childConfig, prop) &&
            isObject(parentConfig[prop])) {
        // make sure changes to properties don't modify parent config
        res[prop] = extend({}, res[prop]);
    }
}
return res;

}