// import { globalThisShim as globalThis } from "./globalThis.js"

export 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 = globalThis.setTimeout
const NATIVE_CLEAR_TIMEOUT = globalThis.clearTimeout

export function installTimerFunctions(obj, opts) {
    if (opts.useNativeTimers) {
        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis)
        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis)
    } else {
        obj.setTimeoutFn = globalThis.setTimeout.bind(globalThis)
        obj.clearTimeoutFn = globalThis.clearTimeout.bind(globalThis)
    }
}

// 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
export 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
}