import { createApp } from 'vue'
import AiChatWidget from '@/components/ai-chat/index.vue'
import { setSDKConfig, type SDKConfig } from '@/components/ai-chat/api'

// 全局状态
let isInitialized = false
let app: any = null
let container: HTMLElement | null = null

// 默认配置
const defaultConfig: Partial<SDKConfig> = {
  themeColor: ['#667eea', '#764ba2'],
  position: {
    top: 'auto',
    right: '20px',
    bottom: '20px',
    left: 'auto'
  },
  draggable: true,
  pollingInterval: 500
}

/**
 * 初始化AI聊天SDK
 * @param config SDK配置
 */
export const init = (config: SDKConfig) => {
  // 防止重复初始化
  if (isInitialized) {
    console.warn('AI Chat SDK 已经初始化过了')
    return
  }

  // 验证必需参数
  if (!config.botCode || !config.userName) {
    throw new Error('botCode 和 userName 是必需参数')
  }

  // 合并配置
  const finalConfig = { ...defaultConfig, ...config }

  // 设置全局配置
  setSDKConfig(finalConfig)

  // 创建容器
  container = document.createElement('div')
  container.id = 'ai-chat-sdk-container'
  container.style.position = 'fixed'
  container.style.zIndex = '9999'
  container.style.pointerEvents = 'none'
  document.body.appendChild(container)

  // 创建Vue应用实例
  app = createApp(AiChatWidget, {
    themeColor: finalConfig.themeColor,
    position: finalConfig.position,
    draggable: finalConfig.draggable,
    pollingInterval: finalConfig.pollingInterval
  })

  // 挂载应用
  app.mount(container)

  // 标记为已初始化
  isInitialized = true

  console.log('AI Chat SDK 初始化成功', finalConfig)
}

/**
 * 销毁SDK实例
 */
export const destroy = () => {
  if (!isInitialized || !app || !container) {
    console.warn('AI Chat SDK 未初始化或已经销毁')
    return
  }

  // 卸载Vue应用
  app.unmount()
  app = null

  // 移除DOM容器
  if (container && container.parentNode) {
    container.parentNode.removeChild(container)
  }
  container = null

  // 重置状态
  isInitialized = false

  console.log('AI Chat SDK 已销毁')
}

/**
 * 检查SDK是否已初始化
 */
export const isSDKInitialized = () => isInitialized

/**
 * 重新配置SDK（需要先销毁再初始化）
 */
export const reconfigure = (config: SDKConfig) => {
  destroy()
  init(config)
}

// 导出类型
export type { SDKConfig } from '@/components/ai-chat/api'

// 默认导出
export default {
  init,
  destroy,
  isSDKInitialized,
  reconfigure
}