"use strict";

const COPY_TO_CLIPBOARD_STATUS_ID = "copyToClipboardStatus";
let copyToClipboardCtr = 0;

function copyToClipboardSuccess() {
    let statusElem = document.getElementById(COPY_TO_CLIPBOARD_STATUS_ID);
    statusElem.innerText = "URL copied!";
    statusElem.classList.remove("fail");
    statusElem.classList.add("success");
}

function copyToClipboardFail(cause) {
    let statusElem = document.getElementById(COPY_TO_CLIPBOARD_STATUS_ID);
    if (!cause) cause = "unknown error";
    statusElem.innerText = "copy failed: " + cause;
    statusElem.classList.remove("success");
    statusElem.classList.add("fail");
}

function copyToClipboard(url) {
    let copyEventIdx = ++copyToClipboardCtr;

    if (!window.navigator.clipboard) {
        let msg = "could not access clipboard";
        if (window.location.protocol !== "https:") {
            msg += ": website not using HTTPS"
        }
        copyToClipboardFail(msg);
        return;
    }
    window.navigator.clipboard.writeText(url).then(() => {
        if (copyToClipboardCtr !== copyEventIdx) return;
        copyToClipboardSuccess();
    }, () => {
        if (copyToClipboardCtr !== copyEventIdx) return;
        copyToClipboardFail();
    });
}