/**
 * Lightbox semplice per le gallerie WordPress.
 * Nessun plugin / nessuna libreria esterna.
 */
function lem_gallery_lightbox() {

    // CSS
    wp_register_style( 'lem-gallery-lightbox', false );
    wp_enqueue_style( 'lem-gallery-lightbox' );

    wp_add_inline_style( 'lem-gallery-lightbox', '
        .lem-lightbox {
            position: fixed;
            inset: 0;
            z-index: 999999;
            background: rgba(0,0,0,.92);
            display: none;
            align-items: center;
            justify-content: center;
        }

        .lem-lightbox.is-open {
            display: flex;
        }

        .lem-lightbox__image {
            display: block;
            max-width: 90vw;
            max-height: 88vh;
            width: auto;
            height: auto;
            object-fit: contain;
        }

        .lem-lightbox__close,
        .lem-lightbox__prev,
        .lem-lightbox__next {
            position: absolute;
            border: 0;
            background: rgba(0,0,0,.35);
            color: #fff;
            cursor: pointer;
            z-index: 2;
            font-family: Arial, sans-serif;
        }

        .lem-lightbox__close {
            top: 20px;
            right: 20px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            font-size: 34px;
            line-height: 48px;
        }

        .lem-lightbox__prev,
        .lem-lightbox__next {
            top: 50%;
            transform: translateY(-50%);
            width: 55px;
            height: 70px;
            font-size: 46px;
            line-height: 60px;
        }

        .lem-lightbox__prev {
            left: 20px;
        }

        .lem-lightbox__next {
            right: 20px;
        }

        .wp-block-gallery img {
            cursor: zoom-in;
        }

        body.lem-lightbox-open {
            overflow: hidden;
        }

        @media (max-width: 700px) {
            .lem-lightbox__image {
                max-width: 96vw;
                max-height: 82vh;
            }

            .lem-lightbox__prev,
            .lem-lightbox__next {
                width: 44px;
                height: 60px;
                font-size: 38px;
                background: rgba(0,0,0,.25);
            }

            .lem-lightbox__prev {
                left: 5px;
            }

            .lem-lightbox__next {
                right: 5px;
            }
        }
    ' );


    // JS
    wp_register_script(
        'lem-gallery-lightbox',
        '',
        array(),
        null,
        true
    );

    wp_enqueue_script( 'lem-gallery-lightbox' );

    wp_add_inline_script( 'lem-gallery-lightbox', '
    document.addEventListener("DOMContentLoaded", function () {

        const galleries = document.querySelectorAll(".wp-block-gallery");

        if (!galleries.length) {
            return;
        }

        const lightbox = document.createElement("div");
        lightbox.className = "lem-lightbox";

        lightbox.innerHTML = `
            <button class="lem-lightbox__close" aria-label="Chiudi">&times;</button>
            <button class="lem-lightbox__prev" aria-label="Immagine precedente">&#10094;</button>
            <img class="lem-lightbox__image" src="" alt="">
            <button class="lem-lightbox__next" aria-label="Immagine successiva">&#10095;</button>
        `;

        document.body.appendChild(lightbox);

        const lightboxImage = lightbox.querySelector(".lem-lightbox__image");
        const closeButton   = lightbox.querySelector(".lem-lightbox__close");
        const prevButton    = lightbox.querySelector(".lem-lightbox__prev");
        const nextButton    = lightbox.querySelector(".lem-lightbox__next");

        let currentImages = [];
        let currentIndex = 0;
        let touchStartX = 0;

        function getLargeImage(img) {

            // Se la foto è già linkata al file originale, usa quello.
            const link = img.closest("a");

            if (
                link &&
                link.href &&
                /\.(jpg|jpeg|png|gif|webp|avif)(\\?.*)?$/i.test(link.href)
            ) {
                return link.href;
            }

            // Altrimenti usa l'immagine più grande disponibile nel srcset.
            if (img.srcset) {
                const sources = img.srcset
                    .split(",")
                    .map(function(item) {
                        const parts = item.trim().split(/\\s+/);
                        return {
                            src: parts[0],
                            width: parseInt(parts[1]) || 0
                        };
                    })
                    .sort(function(a, b) {
                        return b.width - a.width;
                    });

                if (sources.length) {
                    return sources[0].src;
                }
            }

            return img.src;
        }

        function showImage(index) {

            if (!currentImages.length) {
                return;
            }

            if (index < 0) {
                index = currentImages.length - 1;
            }

            if (index >= currentImages.length) {
                index = 0;
            }

            currentIndex = index;

            const img = currentImages[currentIndex];

            lightboxImage.src = getLargeImage(img);
            lightboxImage.alt = img.alt || "";
        }

        function openLightbox(images, index) {
            currentImages = images;
            currentIndex = index;

            showImage(currentIndex);

            lightbox.classList.add("is-open");
            document.body.classList.add("lem-lightbox-open");
        }

        function closeLightbox() {
            lightbox.classList.remove("is-open");
            document.body.classList.remove("lem-lightbox-open");

            lightboxImage.src = "";
        }

        function nextImage() {
            showImage(currentIndex + 1);
        }

        function prevImage() {
            showImage(currentIndex - 1);
        }

        galleries.forEach(function(gallery) {

            const images = Array.from(
                gallery.querySelectorAll("img")
            );

            images.forEach(function(img, index) {

                img.addEventListener("click", function(e) {

                    // Evita che WordPress apra direttamente il jpg.
                    const link = img.closest("a");

                    if (link) {
                        e.preventDefault();
                    }

                    openLightbox(images, index);
                });

                const link = img.closest("a");

                if (link) {
                    link.addEventListener("click", function(e) {
                        e.preventDefault();
                    });
                }
            });
        });

        nextButton.addEventListener("click", function(e) {
            e.stopPropagation();
            nextImage();
        });

        prevButton.addEventListener("click", function(e) {
            e.stopPropagation();
            prevImage();
        });

        closeButton.addEventListener("click", function(e) {
            e.stopPropagation();
            closeLightbox();
        });

        lightbox.addEventListener("click", function(e) {
            if (e.target === lightbox) {
                closeLightbox();
            }
        });

        document.addEventListener("keydown", function(e) {

            if (!lightbox.classList.contains("is-open")) {
                return;
            }

            if (e.key === "ArrowRight") {
                nextImage();
            }

            if (e.key === "ArrowLeft") {
                prevImage();
            }

            if (e.key === "Escape") {
                closeLightbox();
            }
        });


        // Swipe mobile
        lightbox.addEventListener("touchstart", function(e) {
            touchStartX = e.changedTouches[0].screenX;
        }, { passive: true });

        lightbox.addEventListener("touchend", function(e) {

            const touchEndX = e.changedTouches[0].screenX;
            const difference = touchStartX - touchEndX;

            if (Math.abs(difference) < 50) {
                return;
            }

            if (difference > 0) {
                nextImage();
            } else {
                prevImage();
            }

        }, { passive: true });

    });
    ' );
}

add_action( 'wp_enqueue_scripts', 'lem_gallery_lightbox' );


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