"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.pick = pick;
exports.installTimerFunctions = installTimerFunctions;
exports.byteLength = byteLength;
exports.randomString = randomString;
const globals_node_js_1 = require("./globals.node.js");
function pick(obj, ...attr) {
    return attr.reduce((acc, k) => {
        if (obj.hasOwnProperty(k)) {
            acc[k] = obj[k];
        }
        return acc;
    }, {});
}
// Keep a reference to the real timeout functions so they can be used when overridden
const NATIVE_SET_TIMEOUT = globals_node_js_1.globalThisShim.setTimeout;
const NATIVE_CLEAR_TIMEOUT = globals_node_js_1.globalThisShim.clearTimeout;
function installTimerFunctions(obj, opts) {
    if (opts.useNativeTimers) {
        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globals_node_js_1.globalThisShim);
        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globals_node_js_1.globalThisShim);
    }
    else {
        obj.setTimeoutFn = globals_node_js_1.globalThisShim.setTimeout.bind(globals_node_js_1.globalThisShim);
        obj.clearTimeoutFn = globals_node_js_1.globalThisShim.clearTimeout.bind(globals_node_js_1.globalThisShim);
    }
}
// base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
const BASE64_OVERHEAD = 1.33;
// we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
function byteLength(obj) {
    if (typeof obj === "string") {
        return utf8Length(obj);
    }
    // arraybuffer or blob
    return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
}
function utf8Length(str) {
    let c = 0, length = 0;
    for (let i = 0, l = str.length; i < l; i++) {
        c = str.charCodeAt(i);
        if (c < 0x80) {
            length += 1;
        }
        else if (c < 0x800) {
            length += 2;
        }
        else if (c < 0xd800 || c >= 0xe000) {
            length += 3;
        }
        else {
            i++;
            length += 4;
        }
    }
    return length;
}
/**
 * Generates a random 8-characters string.
 */
function randomString() {
    return (Date.now().toString(36).substring(3) +
        Math.random().toString(36).substring(2, 5));
}