/**
 * MetonaEditor Context Menu — right-click menu
 * @module context-menu
 * @version 0.2.5
 */

import { t as i18nT } from './i18n';
import type { MarkdownEditor } from './core';

export function registerContextMenu(this: MarkdownEditor, items: any[] = []): MarkdownEditor {
  this._contextMenuItems = items;
  return this;
}

export function bindContextMenu(this: MarkdownEditor): void {
  if (!this.el) return;
  const onContextMenu = (e: MouseEvent) => {
    const existing = document.querySelector('.me-context-menu');
    if (existing) existing.remove();
    this._showContextMenu(e);
  };
  this.el.addEventListener('contextmenu', onContextMenu);
  this._cleanups.push(() => this.el.removeEventListener('contextmenu', onContextMenu));
}

export function showContextMenu(this: MarkdownEditor, e: MouseEvent): void {
  e.preventDefault();
  const ta = this.textarea;
  const hasSelection = ta && ta.selectionStart !== ta.selectionEnd;
  const defaultItems: Array<{ label?: string; action?: string; shortcut?: string; sep?: boolean; disabled?: boolean; onClick?: () => void }> = [
    { label: i18nT('undo') || 'Undo', action: 'undo', shortcut: 'Ctrl+Z', disabled: !this.canUndo() },
    { label: i18nT('redo') || 'Redo', action: 'redo', shortcut: 'Ctrl+Y', disabled: !this.canRedo() },
    { sep: true },
    { label: i18nT('cut') || 'Cut', action: 'cut', shortcut: 'Ctrl+X', disabled: !hasSelection },
    { label: i18nT('copy') || 'Copy', action: 'copy', shortcut: 'Ctrl+C', disabled: !hasSelection },
    { label: i18nT('paste') || 'Paste', action: 'paste', shortcut: 'Ctrl+V', disabled: !!this.config.readOnly },
    { label: i18nT('selectAll') || 'Select All', action: 'selectAll', shortcut: 'Ctrl+A' },
  ];
  const items = [...defaultItems];
  if (this._contextMenuItems.length) {
    items.push({ sep: true });
    this._contextMenuItems.forEach((item) => items.push(item));
  }
  const menu = document.createElement('div');
  menu.className = 'me-context-menu';
  menu.style.left = e.clientX + 'px';
  menu.style.top = e.clientY + 'px';
  // Adjust if off-screen
  requestAnimationFrame(() => {
    const rect = menu.getBoundingClientRect();
    if (rect.right > window.innerWidth) menu.style.left = (e.clientX - rect.width) + 'px';
    if (rect.bottom > window.innerHeight) menu.style.top = (e.clientY - rect.height) + 'px';
  });
  items.forEach((item) => {
    if ((item as any).sep) { const sep = document.createElement('div'); sep.className = 'me-context-menu-sep'; menu.appendChild(sep); return; }
    const el = document.createElement('div');
    el.className = 'me-context-menu-item';
    if (item.disabled) el.classList.add('me-disabled');
    el.innerHTML = `<span>${item.label}</span>${item.shortcut ? `<span class="me-context-menu-shortcut">${item.shortcut}</span>` : ''}`;
    el.addEventListener('click', (ev) => {
      ev.stopPropagation();
      if (item.disabled) return;
      if (item.onClick) { item.onClick(); }
      else if (item.action) this._execContextAction(item.action);
      this._hideContextMenu();
    });
    menu.appendChild(el);
  });
  document.body.appendChild(menu);
  const close = (ev: Event) => {
    if (!menu.contains(ev.target as Node)) { this._hideContextMenu(); }
  };
  document.addEventListener('click', close, { once: true });
  document.addEventListener('keydown', (ev) => { if (ev.key === 'Escape') this._hideContextMenu(); }, { once: true });
}

export function hideContextMenu(this: MarkdownEditor): void {
  const menu = document.querySelector('.me-context-menu');
  if (menu) menu.remove();
}

export function execContextAction(this: MarkdownEditor, action: string): void {
  const ta = this.textarea;
  if (!ta) return;
  switch (action) {
    case 'undo': this.undo(); break;
    case 'redo': this.redo(); break;
    case 'cut': document.execCommand('cut'); break;
    case 'copy': document.execCommand('copy'); break;
    case 'paste': document.execCommand('paste'); break;
    case 'selectAll': ta.focus(); ta.select(); break;
    default: this.exec(action); break;
  }
}

// ============ Prototype installation ============

export const installContextMenu = (proto: any): void => {
  proto.registerContextMenu = registerContextMenu;
  proto._bindContextMenu = bindContextMenu;
  proto._showContextMenu = showContextMenu;
  proto._hideContextMenu = hideContextMenu;
  proto._execContextAction = execContextAction;
};