/**
 * Clipboard functions
 *
 * Dependencies:
 *   - popper.js (https://github.com/popperjs/popper-core)
 *   - clipboard.js (https://github.com/zenorocha/clipboard.js)
 */

$(function () {
    const btnSelector = '.code-header>button';
    const ICON_SUCCESS = 'fas fa-check';
    const ATTR_TIMEOUT = 'timeout';
    const ATTR_TITLE_SUCCEED = 'data-title-succeed';
    const ATTR_TITLE_ORIGIN = 'data-original-title';
    const TIMEOUT = 2000; // in milliseconds

    function isLocked(node) {
        if ($(node)[0].hasAttribute(ATTR_TIMEOUT)) {
            let timeout = $(node).attr(ATTR_TIMEOUT);
            if (Number(timeout) > Date.now()) {
                return true;
            }
        }
        return false;
    }

    function lock(node) {
        $(node).attr(ATTR_TIMEOUT, Date.now() + TIMEOUT);
    }

    function unlock(node) {
        $(node).removeAttr(ATTR_TIMEOUT);
    }

    /* --- Copy code block --- */

    // Initial the clipboard.js object
    const clipboard = new ClipboardJS(btnSelector, {
        target(trigger) {
            let codeBlock = trigger.parentNode.nextElementSibling;
            return codeBlock.querySelector('code .rouge-code');
        }
    });

    $(btnSelector).tooltip({
        trigger: 'hover',
        placement: 'left'
    });

    function getIcon(btn) {
        let iconNode = $(btn).children();
        return iconNode.attr('class');
    }

    const ICON_DEFAULT = getIcon(btnSelector);

    function showTooltip(btn) {
        const succeedTitle = $(btn).attr(ATTR_TITLE_SUCCEED);
        $(btn).attr(ATTR_TITLE_ORIGIN, succeedTitle).tooltip('show');
    }

    function hideTooltip(btn) {
        $(btn).tooltip('hide').removeAttr(ATTR_TITLE_ORIGIN);
    }

    function setSuccessIcon(btn) {
        let btnNode = $(btn);
        let iconNode = btnNode.children();
        iconNode.attr('class', ICON_SUCCESS);
    }

    function resumeIcon(btn) {
        let btnNode = $(btn);
        let iconNode = btnNode.children();
        iconNode.attr('class', ICON_DEFAULT);
    }

    clipboard.on('success', (e) => {
        e.clearSelection();

        const trigger = e.trigger;
        if (isLocked(trigger)) {
            return;
        }

        setSuccessIcon(trigger);
        showTooltip(trigger);
        lock(trigger);

        setTimeout(() => {
            hideTooltip(trigger);
            resumeIcon(trigger);
            unlock(trigger);
        }, TIMEOUT);

    });

    /* --- Post link sharing --- */

    $('#copy-link').on('click',(e) => {
        let target = $(e.target);

        if (isLocked(target)) {
            return;
        }

        // Copy URL to clipboard
        navigator.clipboard
            .writeText(window.location.href)
            .then(() => {
                const defaultTitle = target.attr(ATTR_TITLE_ORIGIN);
                const succeedTitle = target.attr(ATTR_TITLE_SUCCEED);
                // Switch tooltip title
                target.attr(ATTR_TITLE_ORIGIN, succeedTitle).tooltip('show');
                lock(target);

                setTimeout(() => {
                    target.attr(ATTR_TITLE_ORIGIN, defaultTitle);
                    unlock(target);
                }, TIMEOUT);
            });
    });
});