/**
 * Prebuilt CKEditor 5 plugin bundle for Drupal (sandbox quality).
 *
 * Provides a toolbar button "Footnote" that opens a Drupal dialog asking for:
 *  - Reference ID / key (free text for now)
 *  - Optional page
 * Then inserts: <fn reference="..." page="..."></fn>
 *
 * Replace this with a proper build + entity autocomplete later.
 */
(function () {
    const w = window;

    // Guard: CKEditor5 globals must exist.
    w.CKEditor5 = w.CKEditor5 || {};
    w.CKEditor5.footnotepicker2 = w.CKEditor5.footnotepicker2 || {};

    const Plugin = (w.CKEditor5 && w.CKEditor5.core && w.CKEditor5.core.Plugin) || null;
    const ButtonView = (w.CKEditor5 && w.CKEditor5.ui && w.CKEditor5.ui.ButtonView) || null;


    if (!Plugin || !ButtonView) {
        // eslint-disable-next-line no-console
        console.warn('[bibcite_footnotes_2] CKEditor5 globals not found; FootnotePicker2 not registered.');
        return;
    }
    // Sanitize ONLY the footnote body (not the article).
    // Allows: <strong>, <em>, <a href="..."> and plain text.
    function sanitizeFootnoteHtml(input) {
        if (!input) return '';

        const allowedTags = new Set(['STRONG', 'EM', 'A']);
        const allowedAttrs = {
            A: new Set(['href', 'title', 'target', 'rel']),
        };

        const template = document.createElement('template');
        template.innerHTML = input;

        const cleanNode = (node) => {
            // Remove comments.
            if (node.nodeType === Node.COMMENT_NODE) {
                node.remove();
                return;
            }

            // Text nodes are fine.
            if (node.nodeType === Node.TEXT_NODE) return;

            // Element nodes.
            if (node.nodeType === Node.ELEMENT_NODE) {
                // Strip disallowed elements but keep their text content.
                if (!allowedTags.has(node.tagName)) {
                    const textNode = document.createTextNode(node.textContent || '');
                    node.replaceWith(textNode);
                    return;
                }

                // Strip disallowed attributes.
                [...node.attributes].forEach((attr) => {
                    const name = attr.name.toLowerCase();
                    const ok = allowedAttrs[node.tagName] && allowedAttrs[node.tagName].has(name);
                    if (!ok) node.removeAttribute(attr.name);
                });

                // Extra link safety.
                if (node.tagName === 'A') {
                    const href = node.getAttribute('href') || '';
                    // Allow only http(s), mailto, and relative URLs.
                    if (!/^(https?:|mailto:|\/)/i.test(href)) {
                        node.removeAttribute('href');
                    }
                    node.setAttribute('rel', 'noopener noreferrer');
                }
            }

            // Recurse.
            [...node.childNodes].forEach(cleanNode);
        };

        [...template.content.childNodes].forEach(cleanNode);
        return template.innerHTML;
    }


    function openFootnoteDialog(onSubmit) {
        const $ = w.jQuery;
        const Drupal = w.Drupal;

        // Fallback: prompt() if dialog isn't available.
        if (!Drupal || !Drupal.dialog || !$) {
            const reference = w.prompt('Reference ID (optional):', '') || '';
            const text = w.prompt('Free-form footnote text (optional):', '') || '';
            const page = w.prompt('Page(s) (optional):', '') || '';
            const value = w.prompt('Value (optional):', '') || '';
            onSubmit({reference: reference.trim(), text: text.trim(), page: page.trim(), value: value.trim()});
            return;
        }

        const $wrapper = $('<div class="reference-footnotes-dialog"></div>');

        // Row 1: reference selector
        $wrapper.append('<div class="rf-row rf-row--ref"><label class="rf-label"><strong>Reference Footnote item:</strong></label></div>');
        const $ref = $(`
    <select class="form-select rf-select">
      <option value="">- None -</option>
      <!-- TODO: populate dynamically / autocomplete later -->
    </select>
  `);
        $wrapper.find('.rf-row--ref').append($ref);

        // Row 2: free-form textarea
        $wrapper.append('<div class="rf-row rf-row--or"><div class="rf-or"><strong>Or add free-form footnote text :</strong></div></div>');
        const $text = $('<textarea class="form-textarea rf-textarea" rows="6"></textarea>');
        $wrapper.append($('<div class="rf-row rf-row--text"></div>').append($text));

        // Helper line
        $wrapper.append('<div class="rf-help">HTML tags can be used, e.g., &lt;strong&gt;, &lt;em&gt;, &lt;a href="..."&gt;</div>');

        // Row 3: pages + value side-by-side
        const $grid = $('<div class="rf-grid"></div>');

        const $pageWrap = $(`
    <div class="rf-field">
      <label class="rf-label">Page(s):</label>
    </div>
  `);
        const $page = $('<input type="text" class="form-text rf-input" />');
        $pageWrap.append($page);

        const $valueWrap = $(`
    <div class="rf-field">
      <label class="rf-label">Value :</label>
    </div>
  `);
        const $value = $('<input type="text" class="form-text rf-input rf-input--value" />');
        $valueWrap.append($value);

        $grid.append($pageWrap, $valueWrap);
        $wrapper.append($grid);

        // Hint line
        $wrapper.append('<div class="rf-hint">Leave blank for an automatic sequential reference number, or enter a custom footnote value</div>');

        const dialog = Drupal.dialog($wrapper.get(0), {
            title: 'Reference Footnotes Dialog',
            width: 900,
            buttons: [
                {
                    text: 'OK',
                    classes: 'button button--primary',
                    click: function (event) {
                        event.preventDefault();
                        console.log('[footnotes] OK clicked');

                        const reference = ($ref.val() || '').toString().trim();
                        const text = ($text.val() || '').toString().trim();
                        const page = ($page.val() || '').toString().trim();
                        const value = ($value.val() || '').toString().trim();

                        console.log('[footnotes] values', { reference, text, page, value });

                        if (!reference && !text) {
                            console.warn('[footnotes] blocked: reference + text are empty');
                            $text.trigger('focus');
                            return;
                        }

                        // IMPORTANT: do the work first.
                        console.log('[footnotes] calling onSubmit()');
                        onSubmit({ reference, text, page, value });

                        // Then close/destroy, but never let this prevent insertion.
                        try { dialog.close(); } catch (e) { console.warn('[footnotes] dialog.close failed', e); }
                    }

                },
                {
                    text: 'Cancel',
                    click: function () {
                        dialog.close();
                        dialog.destroy();
                    }
                }
            ]
        });

        dialog.showModal();
        setTimeout(() => $ref.trigger('focus'), 0);
    }


    class FootnotePicker2 extends Plugin {
        init() {
            const editor = this.editor;

            editor.ui.componentFactory.add('footnotePicker2', (locale) => {
                const button = new ButtonView(locale);

                const footnoteIcon = `
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20">
  <path d="M7.8 6.6c0-1.1-.9-2-2-2H4.2c-1.1 0-2 .9-2 2v2.3c0 1.1.9 2 2 2h1.1v1.7H3.7c-1 0-1.7.8-1.7 1.7v.3h4.3c1 0 1.7-.8 1.7-1.7V10c0-.7-.4-1.3-1-1.6.5-.4.8-1 .8-1.8V6.6zm10 0c0-1.1-.9-2-2-2h-1.6c-1.1 0-2 .9-2 2v2.3c0 1.1.9 2 2 2h1.1v1.7h-1.7c-1 0-1.7.8-1.7 1.7v.3h4.3c1 0 1.7-.8 1.7-1.7V10c0-.7-.4-1.3-1-1.6.5-.4.8-1 .8-1.8V6.6z"/>
</svg>
`;

                button.set({
                    label: 'Footnote',
                    icon: footnoteIcon,
                    tooltip: 'Insert footnote',
                    withText: false,
                });

                button.on('execute', () => {
                    openFootnoteDialog(({reference, text: footnoteText, page, value}) => {

                        const attrs = [];
                        if (reference) attrs.push('reference="' + reference.replace(/"/g, '&quot;') + '"');
                        if (page) attrs.push('page="' + page.replace(/"/g, '&quot;') + '"');
                        if (value) attrs.push('value="' + value.replace(/"/g, '&quot;') + '"');

                        const inner = footnoteText ? sanitizeFootnoteHtml(footnoteText) : '';
                        const html = '<fn' + (attrs.length ? ' ' + attrs.join(' ') : '') + '>' + inner + '</fn>';

                        let viewFragment, modelFragment;

                        try {
                            viewFragment = editor.data.processor.toView(html);
                            modelFragment = editor.data.toModel(viewFragment);
                        } catch (e) {
                            console.error('[footnotes] toModel failed', e);
                            return;
                        }

                        console.log('[footnotes] inserting html:', html);
                        console.log('[footnotes] modelFragment childCount:', modelFragment ? modelFragment.childCount : null);


                        editor.model.change((writer) => {
                            // If <fn> got stripped, modelFragment will be empty.
                            if (!modelFragment || modelFragment.childCount === 0) {
                                console.warn('[footnotes] <fn> was stripped; inserting as plain text fallback');
                                editor.model.insertContent(writer.createText(html), editor.model.document.selection);
                                return;
                            }

                            editor.model.insertContent(modelFragment, editor.model.document.selection);
                        });

                    });
                });


                return button;
            });
        }
    }

    w.CKEditor5.footnotepicker2.FootnotePicker2 = FootnotePicker2;
})();