/**
 * Standard library
 *
 * This library provides useful functionalities for the DOM and other manipulations.
 *
 * @copyright  Dennis Eichhorn
 * @license    OMS License 1.0
 * @version    1.0.0
 * @since      1.0.0
 */
(function (jsOMS)
{
    "use strict";

    /**
     * Trim char from string
     *
     * @param {string} str  String to trim from
     * @param {string} char Char to trim
     *
     * @return {string}
     *
     * @since  1.0.0
     */
    jsOMS.trim = function(str, char = ' ')
    {
        return jsOMS.ltrim(jsOMS.rtrim(str, char), char);
    };

    /**
     * Trim char from right part of string
     *
     * @param {string} str  String to trim from
     * @param {string} char Char to trim
     *
     * @return {string}
     *
     * @since  1.0.0
     */
    jsOMS.rtrim = function(str, char = ' ')
    {
        return str.replace(new RegExp("[" + char + "]*$"), '');
    };

    /**
     * Trim char from left part of string
     *
     * @param {string} str  String to trim from
     * @param {string} char Char to trim
     *
     * @return {string}
     *
     * @since  1.0.0
     */
    jsOMS.ltrim = function(str, char = ' ')
    {
        return str.replace(new RegExp("^[" + char + "]*"), '');
    };

    /**
     * Validate json string
     *
     * @param {string} jsonString String to validate
     *
     * @return {boolean}
     *
     * @since  1.0.0
     */
    jsOMS.isValidJson = function (jsonString)
    {
        try {
            JSON.parse(jsonString);
        } catch (e) {
            return false;
        }
        return true;
    };

    /**
     * Count string in string
     *
     * @param {string} str    String to inspect
     * @param {string} substr Substring to count
     *
     * @return {int}
     *
     * @since  1.0.0
     */
    jsOMS.substr_count = function(str, substr) {
        str    += '';
        substr += '';

        const step = substr.length;

        if (step <= 0) {
            return (str.length + 1);
        }

        let n    = 0,
            pos  = 0;

        while (true) {
            pos = str.indexOf(substr, pos);

            if (pos >= 0) {
                ++n;
                pos += step;
            } else {
                break;
            }
        }

        return n;
    };

    /**
     * Integer hash
     *
     * @param {string} str String to hash
     *
     * @return {int}
     *
     * @since  1.0.0
     */
    jsOMS.hash = function (str)
    {
        let res   = 0
        const len = str.length;

        for (let i = 0; i < len; ++i) {
            res = res * 31 + str.charCodeAt(i);
        }

        return res;
    };

    /**
     * Get the remaining string after finding a certain char
     *
     * @param {string} haystack String to to search in
     * @param {array} chars     Chars to search for
     *
     * @return {string}
     *
     * @since  1.0.0
     */
    jsOMS.strpbrk = function (haystack, chars)
    {
        const length = chars.length;
        let found    = haystack.length;
        let min      = haystack.length;

        for (let i = 0; i < length; ++i) {
            if ((found = haystack.indexOf(chars.charAt(i))) >= 0 && min > found) {
                min = found;
            }
        }

        return haystack.slice(min);
    };

    /**
     * Encodes special html characters
     *
     * @param {string}  text   String to encode
     * @param {boolean} quotes Should quotes be allowed
     *
     * @return {string}
     *
     * @since  1.0.0
     */
    jsOMS.htmlspecialchars = function (text, quotes) {
        let map = {
            '&': '&amp;',
            '<': '&lt;',
            '>': '&gt;',
            '"': '&quot;',
            "'": '&#039;'
        };

        if (quotes) {
            map['"'] = '"';
            map["'"] = "'";
        }

        return text.replace(/[&<>"']/g, function(m) { return map[m]; });
    };
}(window.jsOMS = window.jsOMS || {}));