/**
@license
Copyright (c) 2025 trading_peter
This program is available under Apache License Version 2.0
*/

import { LitElement, html, css } from 'lit';
import { Editor } from '@tiptap/core';
import Document from '@tiptap/extension-document';
import Paragraph from '@tiptap/extension-paragraph';
import Text from '@tiptap/extension-text';
import HardBreak from '@tiptap/extension-hard-break';
import { UndoRedo } from '@tiptap/extensions';
import Mention from '@tiptap/extension-mention';
import { MenuPositioner } from './menu-positioner.js';
import './tp-rtb-emoji-suggestion.js';


import { FormElement } from '@tp/helpers/form-element.js';

class TpRichTextBox extends FormElement(LitElement) {
  static get styles() {
    return [
      css`
        :host {
          display: flex;
          flex-direction: column;
          border: 1px solid #ccc;
          position: relative;
        }

        .custom-floating-menu {
          display: flex;
          padding: 4px;
          background-color: #fff;
          border: 1px solid #ccc;
          border-radius: 4px;
          box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
          position: absolute;
          top: 0;
          left: 0;
          z-index: 100;
        }

        .custom-floating-menu[hidden] {
          display: none;
        }

        .suggestion-menu {
          display: block;
          padding: 0;
          background-color: #fff;
          border: 1px solid #ccc;
          border-radius: 4px;
          box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
          position: absolute;
          top: 0;
          left: 0;
          z-index: 101;
        }

        .suggestion-menu[hidden] {
          display: none;
        }

        slot[name="content"]::slotted(*) {
          white-space: pre-wrap;
        }
      `
    ];
  }

  constructor() {
    super();
    this.extensions = [];
    this.menuMode = 'hidden'; // 'hidden', 'selection', 'suggestion'
    this.activeSuggestionType = null; // 'emoji', 'user', null
    this._slotObserver = new MutationObserver(this._processSlotChanges.bind(this));
  }

  render() {
    return html`
      <!-- Selection-based floating menu with all controls -->
      <div class="custom-floating-menu" ?hidden=${this.menuMode !== 'selection'}>
        <slot @slotchange=${this._handleSlotChange}></slot>
      </div>
      
      <!-- Suggestion-based menu for emoji/mention triggers -->
      <div class="suggestion-menu" ?hidden=${this.menuMode !== 'suggestion'}>
        <slot name="suggestion-content" @slotchange=${this._handleSuggestionSlotChange}></slot>
      </div>
      
      <slot name="content"></slot>
    `;
  }

  static get properties() {
    return {
      editor: { type: Object },
      extensions: { type: Array },
      menuMode: { type: String, reflect: true },
      activeSuggestionType: { type: String }
    };
  }

  firstUpdated() {
    // Get initial extensions from slot
    this._processChildExtensions();
    
    // Initialize the editor with collected extensions
    this._initEditor();

    // Observe future slot changes
    this._slotObserver.observe(this, { 
      childList: true,
      subtree: false 
    });
  }

  _initEditor() {
    if (this.editor) {
      this.editor.destroy();
    }

    this.editor = new Editor({
      element: this.querySelector('[slot="content"]'),
      extensions: this.extensions,
      content: '<p>Hello World!</p>',
    });

    // Notify child extensions that the editor is ready
    const children = Array.from(this.children);
    children.forEach(child => {
      if (child._editorReady && typeof child._editorReady === 'function') {
        child._editorReady(this.editor);
      }
    });

    this.editor.on('selectionUpdate', this._handleSelectionUpdate.bind(this));
    this.editor.on('blur', this._handleSelectionUpdate.bind(this));
  }

  _handleSelectionUpdate() {
    const { editor } = this;
    
    if (!editor) {
      console.log('Editor not found.');
      return;
    }

    const { empty, from, to } = editor.state.selection;

    // Hide menu if selection is empty or a caret
    if (empty || from === to) {
      this.hideMenu();
      console.log('Selection is empty or a caret. Hiding menu.');
      return;
    }

    // Show selection menu for text selection
    this.showSelectionMenu();
    console.log('Text selected. Showing selection menu.');
  }

  /**
   * Show the selection-based floating menu
   */
  showSelectionMenu() {
    this.menuMode = 'selection';
    requestAnimationFrame(() => {
      const menu = this.shadowRoot.querySelector('.custom-floating-menu');
      if (menu) {
        MenuPositioner.positionMenu(menu, this.editor);
      }
    });
  }

  /**
   * Show the suggestion-based menu (for emoji/mention triggers)
   */
  showSuggestionMenu(clientRect = null, suggestionType = null) {
    this.menuMode = 'suggestion';
    this.activeSuggestionType = suggestionType;
    
    // Update component visibility
    this._updateSuggestionComponentVisibility();
    
    requestAnimationFrame(() => {
      const menu = this.shadowRoot.querySelector('.suggestion-menu');
      if (menu) {
        MenuPositioner.positionMenuAdvanced(menu, this.editor, clientRect);
      }
    });
  }

  /**
   * Hide all menus
   */
  hideMenu() {
    this.menuMode = 'hidden';
    this.activeSuggestionType = null;
    // Reset all suggestion component visibility
    this._updateSuggestionComponentVisibility();
  }

  _handleSlotChange(e) {
    this._processChildExtensions();
  }

  _handleSuggestionSlotChange(e) {
    // Update visibility of suggestion components based on activeSuggestionType
    this._updateSuggestionComponentVisibility();
  }

  _updateSuggestionComponentVisibility() {
    const emojiComponent = this.querySelector('tp-rtb-emoji-suggestion[slot="suggestion-content"]');
    const userComponent = this.querySelector('tp-rtb-user-mention[slot="suggestion-content"]');
    
    if (emojiComponent) {
      emojiComponent.style.display = this.activeSuggestionType === 'emoji' ? 'block' : 'none';
    }
    if (userComponent) {
      userComponent.style.display = this.activeSuggestionType === 'user' ? 'block' : 'none';
    }
  }

  _processSlotChanges(mutations) {
    let needsUpdate = false;
    
    mutations.forEach(mutation => {
      if (mutation.type === 'childList') {
        needsUpdate = true;
      }
    });
    
    if (needsUpdate) {
      this._processChildExtensions();
    }
  }

  _processChildExtensions() {
    this.extensions = [
      Document,
      Paragraph,
      Text,
      HardBreak,
      UndoRedo,
    ];
    
    // Collect suggestion configurations from child components
    const suggestions = [];
    const children = Array.from(this.children);
    
    children.forEach(child => {
      // If the child has a getSuggestionConfig method, it provides suggestion configuration
      if (child.getSuggestionConfig && typeof child.getSuggestionConfig === 'function') {
        const suggestionConfig = child.getSuggestionConfig();
        if (suggestionConfig) {
          suggestions.push(suggestionConfig);
        }
      }
      // If the child has a getExtension method but not getSuggestionConfig, it's a regular extension
      else if (child.getExtension && typeof child.getExtension === 'function') {
        const extension = child.getExtension();
        if (extension) {
          this.extensions.push(extension);
        }
      }
    });
    
    // If we have suggestions, add a single Mention extension with all suggestions
    if (suggestions.length > 0) {
      this.extensions.push(
        Mention.extend({
          renderText({ options, node }) {
            // Return just the label without the trigger character
            return node.attrs.label || node.attrs.id;
          },
          renderHTML({ options, node }) {
            return [
              'span',
              {
                class: 'mention',
                'data-type': 'mention',
                'data-id': node.attrs.id,
                'data-label': node.attrs.label,
                contenteditable: 'false'
              },
              node.attrs.label || node.attrs.id
            ];
          },
        }).configure({
          HTMLAttributes: {
            class: 'mention',
          },
          suggestions: suggestions
        })
      );
    }
    
    // Re-initialize the editor with new extensions if it already exists
    if (this.editor) {
      this._initEditor();
    }
  }

  disconnectedCallback() {
    super.disconnectedCallback();
    if (this._slotObserver) {
      this._slotObserver.disconnect();
    }
    if (this.editor) {
      this.editor.destroy();
    }
  }

  undo() {
    if (this.editor) {
      this.editor.chain().focus().undo().run();
    }
  }

  redo() {
    if (this.editor) {
      this.editor.chain().focus().redo().run();
    }
  }

  get value() {
    if (this.editor) {
      return this.editor.getJSON();
    }
    
    return {};
  }

  set value(jsonContent) {
    this.updateComplete.then(() => {
      if (this.editor) {
        this.editor.commands.setContent(jsonContent);
      }
    });
  }
}

window.customElements.define('tp-rich-text-box', TpRichTextBox);