import {
  customElement,
  property,
  html,
  DeesElement,
  type TemplateResult,
  cssManager,
  css,
  state,
} from '@design.estate/dees-element';

import { type ISlashMenuItem } from './wysiwyg.types.js';
import { WysiwygShortcuts } from './wysiwyg.shortcuts.js';

declare global {
  interface HTMLElementTagNameMap {
    'dees-slash-menu': DeesSlashMenu;
  }
}

@customElement('dees-slash-menu')
export class DeesSlashMenu extends DeesElement {
  private static instance: DeesSlashMenu;
  
  public static getInstance(): DeesSlashMenu {
    if (!DeesSlashMenu.instance) {
      DeesSlashMenu.instance = new DeesSlashMenu();
      document.body.appendChild(DeesSlashMenu.instance);
    }
    return DeesSlashMenu.instance;
  }

  @state()
  public visible: boolean = false;

  @state()
  private position: { x: number; y: number } = { x: 0, y: 0 };

  @state()
  private filter: string = '';

  @state()
  private selectedIndex: number = 0;

  private callback: ((type: string) => void) | null = null;

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        position: fixed;
        z-index: 10000;
        pointer-events: none;
      }

      .slash-menu {
        position: absolute;
        background: ${cssManager.bdTheme('#ffffff', '#262626')};
        border: 1px solid ${cssManager.bdTheme('#e0e0e0', '#404040')};
        border-radius: 8px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
        padding: 4px;
        min-width: 220px;
        max-height: 300px;
        overflow-y: auto;
        pointer-events: auto;
        user-select: none;
        animation: fadeInScale 0.15s ease-out;
      }

      @keyframes fadeInScale {
        from {
          opacity: 0;
          transform: scale(0.95) translateY(-10px);
        }
        to {
          opacity: 1;
          transform: scale(1) translateY(0);
        }
      }

      .slash-menu-item {
        padding: 10px 12px;
        cursor: pointer;
        transition: all 0.15s ease;
        display: flex;
        align-items: center;
        gap: 12px;
        border-radius: 4px;
        color: ${cssManager.bdTheme('#000000', '#e0e0e0')};
        font-size: 14px;
      }

      .slash-menu-item:hover,
      .slash-menu-item.selected {
        background: ${cssManager.bdTheme('#f0f0f0', '#333333')};
        color: ${cssManager.bdTheme('#000000', '#ffffff')};
      }

      .slash-menu-item .icon {
        width: 24px;
        height: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 16px;
        color: ${cssManager.bdTheme('#666', '#999')};
        font-weight: 600;
      }

      .slash-menu-item:hover .icon,
      .slash-menu-item.selected .icon {
        color: ${cssManager.bdTheme('#0066cc', '#4d94ff')};
      }
    `,
  ];

  render(): TemplateResult {
    if (!this.visible) return html``;

    const menuItems = this.getFilteredMenuItems();

    return html`
      <div 
        class="slash-menu" 
        style="left: ${this.position.x}px; top: ${this.position.y}px;"
        tabindex="-1"
        @mousedown="${(e: MouseEvent) => {
          // Prevent focus loss
          e.preventDefault();
          e.stopPropagation();
        }}"
        @click="${(e: MouseEvent) => {
          e.preventDefault();
          e.stopPropagation();
        }}"
        @focus="${(e: FocusEvent) => {
          // Prevent menu from taking focus
          e.preventDefault();
          e.stopPropagation();
        }}"
      >
        ${menuItems.map((item, index) => html`
          <div 
            class="slash-menu-item ${index === this.selectedIndex ? 'selected' : ''}"
            @click="${() => this.selectItem(item.type)}"
            @mouseenter="${() => this.selectedIndex = index}"
          >
            <span class="icon">${item.icon}</span>
            <span>${item.label}</span>
          </div>
        `)}
      </div>
    `;
  }

  private getFilteredMenuItems(): ISlashMenuItem[] {
    const allItems = WysiwygShortcuts.getSlashMenuItems();
    return allItems.filter(item => 
      this.filter === '' || 
      item.label.toLowerCase().includes(this.filter.toLowerCase())
    );
  }

  private selectItem(type: string): void {
    if (this.callback) {
      this.callback(type);
    }
    this.hide();
  }

  public show(position: { x: number; y: number }, callback: (type: string) => void): void {
    this.position = position;
    this.callback = callback;
    this.filter = '';
    this.selectedIndex = 0;
    this.visible = true;
  }

  public hide(): void {
    this.visible = false;
    this.callback = null;
    this.filter = '';
    this.selectedIndex = 0;
  }

  public updateFilter(filter: string): void {
    this.filter = filter;
    this.selectedIndex = 0;
  }

  public navigate(direction: 'up' | 'down'): void {
    const items = this.getFilteredMenuItems();
    if (direction === 'down') {
      this.selectedIndex = (this.selectedIndex + 1) % items.length;
    } else {
      this.selectedIndex = this.selectedIndex === 0 
        ? items.length - 1 
        : this.selectedIndex - 1;
    }
  }

  public selectCurrent(): void {
    const items = this.getFilteredMenuItems();
    if (items[this.selectedIndex]) {
      this.selectItem(items[this.selectedIndex].type);
    }
  }
}