/**
 * MS1 — Module documentation overlay (navigation + ouverture/fermeture).
 */
(function () {
    'use strict';

    function findOverlayForTrigger(trigger) {
        var anchor = trigger.getAttribute('data-doc-anchor');
        if (!anchor) {
            return null;
        }
        var overlays = document.querySelectorAll('.ms1-doc-overlay[data-doc-anchor="' + anchor + '"]');
        return overlays.length ? overlays[0] : null;
    }

    function getMeta(overlay) {
        var anchor = overlay.getAttribute('data-doc-anchor');
        var script = document.querySelector('script.ms1-doc-meta[data-doc-anchor="' + anchor + '"]');
        if (!script) {
            return [];
        }
        try {
            return JSON.parse(script.textContent || '[]');
        } catch (e) {
            return [];
        }
    }

    function setPage(overlay, index) {
        var pages = overlay.querySelectorAll('.ms1-doc-page');
        var dots = overlay.querySelectorAll('.ms1-doc-dot');
        var meta = getMeta(overlay);
        var total = pages.length;

        if (total === 0) {
            return;
        }

        if (index < 0) {
            index = 0;
        }
        if (index >= total) {
            index = total - 1;
        }

        pages.forEach(function (page, i) {
            if (i === index) {
                page.removeAttribute('hidden');
                page.classList.remove('hidden');
            } else {
                page.setAttribute('hidden', 'hidden');
            }
        });

        dots.forEach(function (dot, i) {
            if (i === index) {
                dot.classList.add('is-active');
            } else {
                dot.classList.remove('is-active');
            }
        });

        var titleEl = overlay.querySelector('.ms1-doc-title');
        var subtitleEl = overlay.querySelector('.ms1-doc-subtitle');
        var currentEl = overlay.querySelector('.ms1-doc-counter-current');
        var prevBtn = overlay.querySelector('.ms1-doc-prev');
        var nextBtn = overlay.querySelector('.ms1-doc-next');

        if (meta[index]) {
            if (titleEl) {
                titleEl.textContent = meta[index].titre || '';
            }
            if (subtitleEl) {
                subtitleEl.textContent = meta[index].sous_titre || '';
            }
        }

        if (currentEl) {
            currentEl.textContent = String(index + 1);
        }

        if (prevBtn) {
            prevBtn.disabled = index <= 0;
        }
        if (nextBtn) {
            nextBtn.disabled = index >= total - 1;
        }

        overlay.setAttribute('data-doc-current-index', String(index));
    }

    function openOverlay(overlay) {
        overlay.removeAttribute('hidden');
        document.body.classList.add('ms1-doc-open');
        var idx = parseInt(overlay.getAttribute('data-doc-current-index') || '0', 10);
        setPage(overlay, idx);
    }

    function closeOverlay(overlay) {
        overlay.setAttribute('hidden', 'hidden');
        if (!document.querySelector('.ms1-doc-overlay:not([hidden])')) {
            document.body.classList.remove('ms1-doc-open');
        }
    }

    function getCurrentIndex(overlay) {
        return parseInt(overlay.getAttribute('data-doc-current-index') || '0', 10);
    }

    function openDocEditPopup(url) {
        var w = window.open(
            url,
            'ms1DocEdit' + Date.now(),
            'width=1120,height=820,scrollbars=yes,resizable=yes'
        );
        if (w) {
            var timer = setInterval(function () {
                if (w.closed) {
                    clearInterval(timer);
                    window.location.reload();
                }
            }, 400);
        }
    }

    document.addEventListener('click', function (e) {
        var docEditLink = e.target.closest('a.ms1-doc-edit-link');
        if (docEditLink && docEditLink.href) {
            e.preventDefault();
            e.stopPropagation();
            openDocEditPopup(docEditLink.href);
            return;
        }

        var trigger = e.target.closest('.ms1-doc-trigger, .btn-doc-trigger');
        if (trigger) {
            e.preventDefault();
            var overlay = findOverlayForTrigger(trigger);
            if (overlay) {
                openOverlay(overlay);
            }
            return;
        }

        var closeEl = e.target.closest('[data-ms1-doc-close]');
        if (closeEl) {
            var overlayClose = closeEl.closest('.ms1-doc-overlay');
            if (overlayClose) {
                closeOverlay(overlayClose);
            }
            return;
        }

        var dot = e.target.closest('.ms1-doc-dot');
        if (dot) {
            var overlayDot = dot.closest('.ms1-doc-overlay');
            if (overlayDot) {
                setPage(overlayDot, parseInt(dot.getAttribute('data-doc-page-index') || '0', 10));
            }
            return;
        }

        if (e.target.closest('[data-ms1-doc-prev]')) {
            var overlayPrev = e.target.closest('.ms1-doc-overlay');
            if (overlayPrev) {
                setPage(overlayPrev, getCurrentIndex(overlayPrev) - 1);
            }
            return;
        }

        if (e.target.closest('[data-ms1-doc-next]')) {
            var overlayNext = e.target.closest('.ms1-doc-overlay');
            if (overlayNext) {
                setPage(overlayNext, getCurrentIndex(overlayNext) + 1);
            }
        }
    });

    document.addEventListener('keydown', function (e) {
        if (e.key !== 'Escape') {
            return;
        }
        var open = document.querySelector('.ms1-doc-overlay:not([hidden])');
        if (open) {
            closeOverlay(open);
        }
    });
})();