import { BrowserWindow, clipboard, Menu } from 'electron'
import type { IpcMainInvokeEvent, MenuItemConstructorOptions } from 'electron'
import type { ChatClipboardAction, ChatTextMenuAction, ChatTextMenuOptions } from '../shared/chatTextMenu'

function trustedChatFrame(event: IpcMainInvokeEvent): boolean {
  if (event.sender.isDestroyed() || event.senderFrame !== event.sender.mainFrame) return false
  const window = BrowserWindow.fromWebContents(event.sender)
  return Boolean(window && !window.isDestroyed())
}

export function readChatClipboardState(event: IpcMainInvokeEvent): { hasText: boolean } {
  return { hasText: trustedChatFrame(event) && clipboard.readText().length > 0 }
}

export function performChatClipboardAction(event: IpcMainInvokeEvent, input: ChatClipboardAction): boolean {
  if (!trustedChatFrame(event) || !input) return false
  if (input.action === 'copy' && typeof input.text === 'string' && input.text.length > 0 && input.text.length <= 5_000_000) {
    clipboard.writeText(input.text)
    return true
  }
  if (input.action === 'paste' && clipboard.readText().length > 0) {
    event.sender.paste()
    return true
  }
  return false
}

export function showChatTextMenu(event: IpcMainInvokeEvent, input: ChatTextMenuOptions): Promise<ChatTextMenuAction> | null {
  if (!input || !['message', 'input'].includes(input.kind) || event.sender.isDestroyed() || event.senderFrame !== event.sender.mainFrame) return null
  const window = BrowserWindow.fromWebContents(event.sender)
  if (!window || window.isDestroyed()) return null
  const label = (value: unknown, fallback: string): string => typeof value === 'string' && value.trim() ? value.slice(0, 80) : fallback

  return new Promise((resolve) => {
    const items: MenuItemConstructorOptions[] = [{
      label: label(input.labels?.copy, 'Copy'),
      enabled: input.canCopy === true,
      click: () => {
        if (!event.sender.isDestroyed() && input.canCopy === true) event.sender.copy()
        resolve(null)
      }
    }]
    if (input.kind === 'input') {
      items.push({
        label: label(input.labels?.paste, 'Paste'),
        enabled: input.canPaste === true && clipboard.readText().length > 0,
        click: () => {
          if (!event.sender.isDestroyed() && input.canPaste === true && clipboard.readText().length > 0) event.sender.paste()
          resolve(null)
        }
      })
    } else if (input.canClear !== undefined) {
      items.push({ type: 'separator' }, {
        label: label(input.labels?.clear, 'Delete conversation'),
        enabled: input.canClear === true,
        click: () => resolve(input.canClear === true ? 'clear' : null)
      })
    }
    Menu.buildFromTemplate(items).popup({ window, callback: () => resolve(null) })
  })
}