import { Controller } from "@hotwired/stimulus";
import { EditorView, basicSetup } from "codemirror";
import { markdown } from "@codemirror/lang-markdown";

export default class extends Controller {
  connect() {
    this.textarea = this.element.querySelector(".editor-md-field");
    this.codePreview = this.element.querySelector("pre");
    // Only initialize CodeMirror if not already done
    if (!this.textarea._codemirror) {
      this.textarea.style.display = "none";
      this.cmParent = document.createElement("div");
      this.textarea.parentNode.insertBefore(this.cmParent, this.textarea);
      this.cmView = new EditorView({
        doc: this.textarea.value,
        extensions: [
          basicSetup,
          markdown(),
          EditorView.lineWrapping,
          EditorView.updateListener.of((update) => {
            if (update.docChanged) {
              this.textarea.value = update.state.doc.toString();
              this.updateMarkdown();
              this.element.dispatchEvent(new CustomEvent('content:changed', { bubbles: true }));
            }
          })
        ],
        parent: this.cmParent
      });
      this.textarea._codemirror = this.cmView;
    } else {
      this.cmView = this.textarea._codemirror;
    }
    this.updateMarkdown();
    // Observe programmatic changes to the value attribute
    this.observer = new MutationObserver(() => this.updateMarkdown());
    this.observer.observe(this.textarea, { attributes: true, attributeFilter: ["value"] });
  }

  disconnect() {
    if (this.observer) this.observer.disconnect();
    if (this.cmView) this.cmView.destroy();
    if (this.cmParent && this.cmParent.parentNode) {
      this.cmParent.parentNode.removeChild(this.cmParent);
    }
    this.textarea.style.display = "";
    this.textarea._codemirror = null;
  }

  async updateMarkdown() {
    if (this.codePreview) {
      this.codePreview.textContent = this.textarea.value;
    }
    // Sync Markdown to Quill (content_html)
    if (window.appQuill) {
      let html = '';
      if (window.marked) {
        html = window.marked.parse(this.textarea.value || '');
      } else {
        // Fallback: use backend endpoint
        try {
          const resp = await fetch('/editor/markdown/preview', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', 'X-Requested-With': 'XMLHttpRequest' },
            body: JSON.stringify({ markdown: this.textarea.value || '' })
          });
          if (resp.ok) {
            const data = await resp.json();
            html = data.html || '';
          }
        } catch (e) { html = ''; }
      }
      // Set Quill content from HTML (replace contents)
      window.appQuill.root.innerHTML = html;
    }
  }
}