document.addEventListener("DOMContentLoaded", () => {
    const dropzone = document.getElementById("dropzone");
    const photoInput = document.getElementById("photoInput");
    const preview = document.getElementById("preview");
    const previewImg = document.getElementById("previewImg");
    const previewName = document.getElementById("previewName");
    const submitBtn = document.getElementById("submitBtn");

    if (!dropzone || !photoInput) return;

    const maxFiles = parseInt(photoInput.dataset.max || "100", 10);

    dropzone.addEventListener("click", (e) => {
        if (e.target.closest("button")) return;
        photoInput.click();
    });

    ["dragenter", "dragover"].forEach((event) => {
        dropzone.addEventListener(event, (e) => {
            e.preventDefault();
            dropzone.classList.add("dropzone--active");
        });
    });

    ["dragleave", "drop"].forEach((event) => {
        dropzone.addEventListener(event, (e) => {
            e.preventDefault();
            dropzone.classList.remove("dropzone--active");
        });
    });

    dropzone.addEventListener("drop", (e) => {
        e.preventDefault();
        assignFiles(e.dataTransfer.files);
    });

    photoInput.addEventListener("change", () => {
        if (photoInput.files.length > 0) {
            showPreview(photoInput.files);
        }
    });

    function assignFiles(fileList) {
        const dt = new DataTransfer();
        const limit = Math.min(fileList.length, maxFiles);
        for (let i = 0; i < limit; i++) {
            if (fileList[i].type.startsWith("image/")) {
                dt.items.add(fileList[i]);
            }
        }
        photoInput.files = dt.files;
        showPreview(photoInput.files);
    }

    function showPreview(files) {
        if (!files || files.length === 0) return;

        const first = files[0];
        const reader = new FileReader();
        reader.onload = (e) => {
            previewImg.src = e.target.result;
            previewName.textContent =
                files.length === 1
                    ? first.name
                    : `${files.length} файлов (первый: ${first.name})`;
            preview.hidden = false;
            submitBtn.disabled = false;
        };
        reader.readAsDataURL(first);
    }

    document.querySelectorAll(".copy-btn").forEach((btn) => {
        btn.addEventListener("click", async (e) => {
            e.stopPropagation();
            const url = btn.dataset.url;
            try {
                await navigator.clipboard.writeText(url);
                showToast("Ссылка скопирована!");
            } catch {
                const input = document.createElement("input");
                input.value = url;
                document.body.appendChild(input);
                input.select();
                document.execCommand("copy");
                document.body.removeChild(input);
                showToast("Ссылка скопирована!");
            }
        });
    });
});

function showToast(message) {
    const existing = document.querySelector(".toast");
    if (existing) existing.remove();

    const toast = document.createElement("div");
    toast.className = "toast";
    toast.textContent = message;
    document.body.appendChild(toast);
    setTimeout(() => toast.remove(), 2500);
}