/*!
    \brief Random helpers.

    \see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
    \see https://stackoverflow.com/questions/1527803/generating-random-whole-numbers-in-javascript-in-a-specific-range
*/

export function generateN<U, R>(count: number, generatefn: (...args: U[]) => R, ...args: U[]) {
    const ret = new Array<R>(count);
    for (let i = 0; i < count; i++)
        ret[i] = generatefn(...args);
    return ret;
}

//! \see https://stackoverflow.com/a/2117523
export function uuidv4() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
        const r = Math.random() * 16 | 0;
        const v = c === 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}

export { uuidv4 as uuid };

export function randomIntInclusive(min: number, max: number) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

export function randomIntExclusive(min: number, max: number) {
    return Math.floor(Math.random() * (max - min)) + min;
}

//! \see https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L14077
export function randomFloatInclusive(min: number, max: number) {
    const rand = Math.random();
    return Math.min(min + (rand * (max - min + parseFloat('1e-' + ((rand + '').length - 1)))), max);
}

export function randomFloatExclusive(min: number, max: number) {
    return Math.random() * (max - min) + min;
}

export function randomChar(alphabet: string) {
    return alphabet[randomIntExclusive(0, alphabet.length)]
}

export function randomString(size: number, alphabet: string) {
    return generateN(size, randomChar, alphabet).join('');
}