/**
 * 썸네일 미리보기 확대 (클릭 고정 / 길게 누르기)
 */
(function initDeckPreviewHold() {
    /** @type {HTMLElement|null} */
    let overlay = null;

    /** @type {number} */
    let pressStartAt = 0;

    /** @type {boolean} */
    let suppressClick = false;

    /** @type {number} */
    const HOLD_THRESHOLD_MS = 280;

    /**
     * @returns {HTMLElement}
     */
    function ensureOverlay() {
        if (!overlay) {
            overlay = document.createElement('div');
            overlay.className = 'deck-preview-hold-overlay hidden';
            overlay.setAttribute('role', 'dialog');
            overlay.setAttribute('aria-modal', 'true');
            overlay.innerHTML =
                '<div class="deck-preview-hold-box"><img alt="" draggable="false" /></div>';
            overlay.addEventListener('click', (e) => {
                if (e.target === overlay) hide();
            });
            document.body.appendChild(overlay);
        }
        return overlay;
    }

    /**
     * @returns {boolean}
     */
    function isVisible() {
        return Boolean(overlay && !overlay.classList.contains('hidden'));
    }

    /**
     * @param {string} src
     */
    function show(src) {
        if (!src) return;
        const el = ensureOverlay();
        const img = el.querySelector('img');
        if (img) img.src = src;
        el.classList.remove('hidden');
    }

    function hide() {
        if (overlay) overlay.classList.add('hidden');
        pressStartAt = 0;
        suppressClick = false;
    }

    /**
     * @param {Event} e
     * @returns {HTMLElement|null}
     */
    function findHoldTarget(e) {
        const target = e.target;
        if (!(target instanceof Element)) return null;
        return target.closest('[data-hold-preview]');
    }

    /**
     * @param {HTMLElement} hold
     * @returns {string}
     */
    function getPreviewSrc(hold) {
        return hold.dataset.previewSrc || '';
    }

    function initGlobal() {
        if (document.documentElement.dataset.deckHoldInit === '1') return;
        document.documentElement.dataset.deckHoldInit = '1';

        document.addEventListener(
            'pointerdown',
            (e) => {
                const hold = findHoldTarget(e);
                if (!hold) return;
                const src = getPreviewSrc(hold);
                if (!src) return;

                pressStartAt = Date.now();
                show(src);

                if (hold.setPointerCapture && e.pointerId !== undefined) {
                    try {
                        hold.setPointerCapture(e.pointerId);
                    } catch {
                        /* ignore */
                    }
                }
            },
            true,
        );

        document.addEventListener(
            'pointerup',
            (e) => {
                if (!pressStartAt) return;

                const hold = findHoldTarget(e);
                if (hold?.releasePointerCapture && e.pointerId !== undefined) {
                    try {
                        hold.releasePointerCapture(e.pointerId);
                    } catch {
                        /* ignore */
                    }
                }

                const heldMs = Date.now() - pressStartAt;
                pressStartAt = 0;

                if (heldMs >= HOLD_THRESHOLD_MS) {
                    hide();
                    suppressClick = true;
                    window.setTimeout(() => {
                        suppressClick = false;
                    }, 0);
                } else {
                    suppressClick = true;
                    window.setTimeout(() => {
                        suppressClick = false;
                    }, 400);
                }
            },
            true,
        );

        document.addEventListener(
            'pointercancel',
            () => {
                hide();
            },
            true,
        );

        document.addEventListener('click', (e) => {
            if (suppressClick) return;

            const hold = findHoldTarget(e);
            if (hold) {
                const src = getPreviewSrc(hold);
                if (!src) return;
                e.preventDefault();
                e.stopPropagation();
                if (isVisible()) hide();
                else show(src);
                return;
            }

            if (isVisible() && e.target === overlay) {
                hide();
            }
        });

        document.addEventListener('keydown', (e) => {
            if (e.key === 'Escape') hide();
        });
    }

    /**
     * @param {HTMLElement} _container
     */
    function bindHoldPreview(_container) {
        initGlobal();
    }

    initGlobal();

    window.UaDeckPreviewHold = { bindHoldPreview, hide };
})();