/**
 * 페이지 제목 옆 ? 버튼 — 설명 툴팁
 */
(function initPageHelp() {
    /** @type {HTMLElement|null} */
    let activeTooltip = null;

    /** @type {HTMLElement|null} */
    let activeBtn = null;

    function closeTooltip() {
        if (activeTooltip) {
            activeTooltip.remove();
            activeTooltip = null;
        }
        if (activeBtn) {
            activeBtn.setAttribute('aria-expanded', 'false');
            activeBtn = null;
        }
    }

    /**
     * @param {HTMLElement} btn
     * @param {string} text
     */
    function openTooltip(btn, text) {
        if (!text) return;
        closeTooltip();

        const tip = document.createElement('div');
        tip.className = 'page-help-tooltip';
        tip.setAttribute('role', 'tooltip');
        tip.id = `page-help-tip-${Date.now()}`;
        tip.textContent = text;
        document.body.appendChild(tip);
        btn.setAttribute('aria-expanded', 'true');
        btn.setAttribute('aria-describedby', tip.id);

        const rect = btn.getBoundingClientRect();
        const margin = 12;
        let left = rect.left + window.scrollX;
        const top = rect.bottom + window.scrollY + 8;
        const tipWidth = tip.offsetWidth;

        if (left + tipWidth > window.innerWidth - margin) {
            left = window.innerWidth - tipWidth - margin;
        }
        left = Math.max(margin, left);

        tip.style.top = `${top}px`;
        tip.style.left = `${left}px`;

        activeTooltip = tip;
        activeBtn = btn;
    }

    /**
     * @param {object} [translations]
     */
    function bindPageHelp(translations) {
        const tFn = (key, fallback) => {
            if (translations?.[key]) return translations[key];
            if (window.UaPageI18n?.t) return window.UaPageI18n.t(key, fallback);
            return fallback;
        };

        document.querySelectorAll('[data-i18n-tooltip]').forEach((btn) => {
            const key = btn.dataset.i18nTooltip;
            const text = tFn(key, '');
            const helpLabel = tFn('pageHelpLabel', '페이지 안내');
            btn.setAttribute('aria-label', text ? `${helpLabel}` : helpLabel);

            if (btn.dataset.helpBound === '1') return;
            btn.dataset.helpBound = '1';

            btn.addEventListener('click', (e) => {
                e.stopPropagation();
                const current = tFn(key, '');
                if (activeBtn === btn && activeTooltip) {
                    closeTooltip();
                    return;
                }
                openTooltip(btn, current);
            });
        });
    }

    document.addEventListener('click', closeTooltip);
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape') closeTooltip();
    });
    window.addEventListener('scroll', closeTooltip, { passive: true });
    window.addEventListener('resize', closeTooltip);

    window.UaPageHelp = { bindPageHelp, closeTooltip };
})();