/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:robert@broofa.com

Copyright (c) 2010 Robert Kieffer
Dual licensed under the MIT and GPL licenses.
*/

/*
 * Generate a random uuid.
 *
 * USAGE: Math.uuid(length, radix)
 *   length - the desired number of characters
 *   radix  - the number of allowable values for each character.
 *
 * EXAMPLES:
 *   // No arguments  - returns RFC4122, version 4 ID
 *   >>> Math.uuid()
 *   "92329D39-6F5C-4520-ABFC-AAB64544E172"
 * 
 *   // One argument - returns ID of the specified length
 *   >>> Math.uuid(15)     // 15 character ID (default base=62)
 *   "VcydxgltxrVZSTV"
 *
 *   // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62)
 *   >>> Math.uuid(8, 2)  // 8 character ID (base=2)
 *   "01001010"
 *   >>> Math.uuid(8, 10) // 8 character ID (base=10)
 *   "47473046"
 *   >>> Math.uuid(8, 16) // 8 character ID (base=16)
 *   "098F4D35"
 */
export class KGen {
    // Private array of chars to use
    private static CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');

    static uuid (len?: number, radix?: number) {
        let chars = this.CHARS, uuid = [];
        radix = radix || chars.length;

        if (len) {
            // Compact form
            for (var i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix];
        } else {
            // rfc4122, version 4 form
            var r;

            // rfc4122 requires these characters
            uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
            uuid[14] = '4';

            // Fill in random data.  At i==19 set the high bits of clock sequence as
            // per rfc4122, sec. 4.1.5
            for (var i = 0; i < 36; i++) {
                if (!uuid[i]) {
                    r = 0 | Math.random() * 16;
                    uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
                }
            }
        }

        return uuid.join('');
    };

    // A more performant, but slightly bulkier, RFC4122v4 solution.  We boost performance
    // by minimizing calls to random()
    static uuidFast () {
        var chars = this.CHARS, uuid = new Array(36), rnd = 0, r;
        for (var i = 0; i < 36; i++) {
            if (i == 8 || i == 13 || i == 18 || i == 23) {
                uuid[i] = '-';
            } else if (i == 14) {
                uuid[i] = '4';
            } else {
                if (rnd <= 0x02) rnd = 0x2000000 + (Math.random() * 0x1000000) | 0;
                r = rnd & 0xf;
                rnd = rnd >> 4;
                uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
            }
        }
        return uuid.join('');
    };

    // A more compact, but less performant, RFC4122v4 solution:
    static uuidCompact () {
        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
            var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
            return v.toString(16);
        }).toUpperCase();
    };

    static randomNumber (min?: number, max?: number) {
        if (typeof (min) == "undefined") min = 0;
        if (typeof (max) == "undefined") max = Number.MAX_VALUE;
        var number = Math.floor(Math.random() * (max - min + 1)) + min;
        return number;
    };

    static rnd () {
        var n = Math.random() * 0x1000000;
        return parseInt(n.toString());
    }

}