import { Node, mergeAttributes } from '@tiptap/core';

export interface FileViewerOptions {
    HTMLAttributes: Record<string, any>;
}

declare module '@tiptap/core' {
    interface Commands<ReturnType> {
        fileViewer: {
            insertFileViewer: (options?: { src?: string }) => ReturnType;
        };
    }
}

export const FileViewer = Node.create<FileViewerOptions>({
    name: 'fileViewer',

    group: 'block',

    selectable: true,

    draggable: true,

    addOptions() {
        return {
            HTMLAttributes: {
                class: 'file-viewer-node',
            },
        };
    },

    addAttributes() {
        return {
            src: {
                default: null,
                parseHTML: element => {
                    const iframe = element.querySelector('iframe');
                    if (iframe) {
                        return iframe.getAttribute('src');
                    }
                    return element.getAttribute('src');
                },
                renderHTML: attributes => {
                    if (!attributes.src) {
                        return {};
                    }
                    return {
                        src: attributes.src,
                    };
                }
            },
        };
    },

    parseHTML() {
        return [
            {
                tag: 'div[data-type="file-viewer-wrapper"]',
            }
        ];
    },

    renderHTML({ HTMLAttributes }) {
        const { src, ...rest } = HTMLAttributes;
        return ['div', mergeAttributes(this.options.HTMLAttributes, rest, { 'data-type': 'file-viewer-wrapper', class: 'file-viewer-wrapper relative w-full my-4 rounded-xl overflow-hidden border border-border flex min-h-[400px] bg-muted/20' }),
            ['iframe', { 'data-type': 'file-viewer', src: src, class: 'w-full h-full border-0 absolute inset-0' }]
        ];
    },

    addNodeView() {
        return ({ node, getPos, editor }) => {
            const wrapper = document.createElement('div');
            wrapper.classList.add('file-viewer-wrapper', 'relative', 'w-full', 'my-4', 'rounded-xl', 'overflow-hidden', 'border', 'border-border', 'flex', 'bg-muted/10', 'group');

            if (node.attrs.src) {
                // Typical file viewer mode
                wrapper.style.minHeight = '400px';

                const iframe = document.createElement('iframe');
                iframe.src = node.attrs.src;
                iframe.classList.add('w-full', 'h-full', 'border-0', 'absolute', 'inset-0');

                // Add a small drag handle / delete button overlay that appears on hover
                const overlay = document.createElement('div');
                overlay.classList.add('absolute', 'top-2', 'right-2', 'hidden', 'group-hover:flex', 'bg-background/80', 'backdrop-blur-sm', 'p-1', 'rounded-lg', 'border', 'border-border', 'shadow-sm', 'z-10');

                const deleteBtn = document.createElement('button');
                deleteBtn.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="text-muted-foreground hover:text-destructive transition-colors"><path d="M3 6h18"></path><path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"></path><path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2"></path></svg>';
                deleteBtn.classList.add('p-1', 'cursor-pointer');
                deleteBtn.onclick = (e) => {
                    e.preventDefault();
                    if (typeof getPos === 'function') {
                        const pos = getPos();
                        if (typeof pos === 'number') {
                            editor.commands.deleteRange({ from: pos, to: pos + node.nodeSize });
                        }
                    }
                };

                overlay.appendChild(deleteBtn);
                wrapper.appendChild(iframe);
                wrapper.appendChild(overlay);
            } else {
                // Form mode
                wrapper.classList.add('items-center', 'justify-center', 'flex-col', 'p-8', 'gap-4');

                const icon = document.createElement('div');
                // AppWindow Lucide Icon
                icon.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="text-muted-foreground/50"><rect x="2" y="4" width="20" height="16" rx="2"></rect><path d="M10 4v4"></path><path d="M2 8h20"></path><path d="M6 4v4"></path></svg>';

                const title = document.createElement('div');
                title.textContent = 'Embed File or Website';
                title.classList.add('font-medium', 'text-sm', 'text-muted-foreground');

                const form = document.createElement('form');
                form.classList.add('flex', 'w-full', 'max-w-md', 'gap-2', 'relative', 'z-10');

                const input = document.createElement('input');
                input.type = 'url';
                input.placeholder = 'https://...';
                input.classList.add('flex-1', 'bg-background', 'border', 'border-border', 'rounded-lg', 'px-3', 'py-1.5', 'text-sm', 'outline-none', 'focus:ring-1', 'focus:ring-primary/50');

                const button = document.createElement('button');
                button.type = 'submit';
                button.textContent = 'Embed';
                button.classList.add('bg-primary', 'text-primary-foreground', 'px-3', 'py-1.5', 'rounded-lg', 'text-sm', 'font-medium', 'hover:bg-primary/90', 'cursor-pointer');

                form.onsubmit = (e) => {
                    e.preventDefault();
                    const url = input.value.trim();
                    if (url && typeof getPos === 'function') {
                        editor.commands.command(({ tr }) => {
                            const pos = getPos();
                            if (typeof pos === 'number') {
                                tr.setNodeMarkup(pos, undefined, { src: url });
                                return true;
                            }
                            return false;
                        });
                    }
                };

                form.appendChild(input);
                form.appendChild(button);

                wrapper.appendChild(icon);
                wrapper.appendChild(title);
                wrapper.appendChild(form);

                // Clicking wrapper focuses input
                wrapper.onclick = () => {
                    input.focus();
                };
            }

            return {
                dom: wrapper,
                stopEvent: () => true,
                ignoreMutation: () => true,
            };
        };
    },

    addCommands() {
        return {
            insertFileViewer: (options?: { src?: string }) => ({ commands }) => {
                return commands.insertContent({
                    type: this.name,
                    attrs: options || {},
                });
            },
        };
    },
});