"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
// @ts-ignore
var char_regex_1 = __importDefault(require("char-regex"));
/**
 * Converts a string to an array of string chars
 * @param {string} str The string to turn into array
 * @returns {string[]}
 */
function toArray(str) {
    if (typeof str !== 'string') {
        throw new Error('A string is expected as input');
    }
    return str.match(char_regex_1.default()) || [];
}
exports.toArray = toArray;
/**
 * Returns the length of a string
 *
 * @export
 * @param {string} str
 * @returns {number}
 */
function length(str) {
    // Check for input
    if (typeof str !== 'string') {
        throw new Error('Input must be a string');
    }
    var match = str.match(char_regex_1.default());
    return match === null ? 0 : match.length;
}
exports.length = length;
/**
 * Returns a substring by providing start and end position
 *
 * @export
 * @param {string} str
 * @param {number} [begin=0] Starting position
 * @param {number} end End position
 * @returns {string}
 */
function substring(str, begin, end) {
    if (begin === void 0) { begin = 0; }
    // Check for input
    if (typeof str !== 'string') {
        throw new Error('Input must be a string');
    }
    // Even though negative numbers work here, theyre not in the spec
    if (typeof begin !== 'number' || begin < 0) {
        begin = 0;
    }
    if (typeof end === 'number' && end < 0) {
        end = 0;
    }
    var match = str.match(char_regex_1.default());
    if (!match)
        return '';
    return match.slice(begin, end).join('');
}
exports.substring = substring;
/**
 * Returns a substring by providing start position and length
 *
 * @export
 * @param {string} str
 * @param {number} [begin=0] Starting position
 * @param {number} len Desired length
 * @returns {string}
 */
function substr(str, begin, len) {
    if (begin === void 0) { begin = 0; }
    // Check for input
    if (typeof str !== 'string') {
        throw new Error('Input must be a string');
    }
    var strLength = length(str);
    // Fix type
    if (typeof begin !== 'number') {
        begin = parseInt(begin, 10);
    }
    // Return zero-length string if got oversize number.
    if (begin >= strLength) {
        return '';
    }
    // Calculating postive version of negative value.
    if (begin < 0) {
        begin += strLength;
    }
    var end;
    if (typeof len === 'undefined') {
        end = strLength;
    }
    else {
        // Fix type
        if (typeof len !== 'number') {
            len = parseInt(len, 10);
        }
        end = len >= 0 ? len + begin : begin;
    }
    var match = str.match(char_regex_1.default());
    if (!match)
        return '';
    return match.slice(begin, end).join('');
}
exports.substr = substr;
/**
 * Enforces a string to be a certain length by
 * adding or removing characters
 *
 * @export
 * @param {string} str
 * @param {number} [limit=16] Limit
 * @param {string} [padString='#'] The Pad String
 * @param {string} [padPosition='right'] The Pad Position
 * @returns {string}
 */
function limit(str, limit, padString, padPosition) {
    if (limit === void 0) { limit = 16; }
    if (padString === void 0) { padString = '#'; }
    if (padPosition === void 0) { padPosition = 'right'; }
    // Input should be a string, limit should be a number
    if (typeof str !== 'string' || typeof limit !== 'number') {
        throw new Error('Invalid arguments specified');
    }
    // Pad position should be either left or right
    if (['left', 'right'].indexOf(padPosition) === -1) {
        throw new Error('Pad position should be either left or right');
    }
    // Pad string can be anything, we convert it to string
    if (typeof padString !== 'string') {
        padString = String(padString);
    }
    // Calculate string length considering astral code points
    var strLength = length(str);
    if (strLength > limit) {
        return substring(str, 0, limit);
    }
    else if (strLength < limit) {
        var padRepeats = padString.repeat(limit - strLength);
        return padPosition === 'left' ? padRepeats + str : str + padRepeats;
    }
    return str;
}
exports.limit = limit;
/**
 * Returns the index of the first occurrence of a given string
 *
 * @export
 * @param {string} str
 * @param {string} [searchStr] the string to search
 * @param {number} [pos] starting position
 * @returns {number}
 */
function indexOf(str, searchStr, pos) {
    if (pos === void 0) { pos = 0; }
    if (typeof str !== 'string') {
        throw new Error('Input must be a string');
    }
    if (str === '') {
        if (searchStr === '') {
            return 0;
        }
        return -1;
    }
    // fix type
    pos = Number(pos);
    pos = isNaN(pos) ? 0 : pos;
    searchStr = String(searchStr);
    var strArr = toArray(str);
    if (pos >= strArr.length) {
        if (searchStr === '') {
            return strArr.length;
        }
        return -1;
    }
    if (searchStr === '') {
        return pos;
    }
    var searchArr = toArray(searchStr);
    var finded = false;
    var index;
    for (index = pos; index < strArr.length; index += 1) {
        var searchIndex = 0;
        while (searchIndex < searchArr.length &&
            searchArr[searchIndex] === strArr[index + searchIndex]) {
            searchIndex += 1;
        }
        if (searchIndex === searchArr.length &&
            searchArr[searchIndex - 1] === strArr[index + searchIndex - 1]) {
            finded = true;
            break;
        }
    }
    return finded ? index : -1;
}
exports.indexOf = indexOf;