import { MAX_SAFE_INTEGER, reIsUint } from "../basic/_global";
import or from "../basic/_or";

/**
 * Checks if `value` is a valid array-like index.
 *
 * @private
 * @param {*} value The value to check.
 * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
 */
function isIndex(value: any, length?: number): boolean {
    const type = typeof value;
    length = length == null ? MAX_SAFE_INTEGER : length;
    return !!length && or(type === "number", reIsUint.test(value)) && value > -1 && value % 1 == 0 && value < length;
}

export default isIndex;
// /** Used as references for various `Number` constants. */
// const MAX_SAFE_INTEGER = 9007199254740991;

// /** Used to detect unsigned integer values. */
// const reIsUint = /^(?:0|[1-9]\d*)$/;

// /**
//  * Checks if `value` is a valid array-like index.
//  *
//  * @private
//  * @param {*} value The value to check.
//  * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
//  * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
//  */
// function isIndex(value, length) {
//     const type = typeof value;
//     length = length == null ? MAX_SAFE_INTEGER : length;

//     return !!length && (type === "number" || (type !== "symbol" && reIsUint.test(value))) && value > -1 && value % 1 == 0 && value < length;
// }

// export default isIndex;