import { DWClient, TOPIC_ROBOT, EventAck } from 'dingtalk-stream'
import { handleRobotCallback } from './handlers'
import { closeConnectionsForPlatform } from '@/remote-control/shared/nova-bridge'
import { BotLogger } from '@/remote-control/shared/logger'
import { ConfigManager, type ConfigChangeEvent } from '@/remote-control/config/manager'

let client: DWClient | null = null
let currentClientId: string = ''
let currentClientSecret: string = ''
let startTime: number = 0
let messagesProcessed: number = 0
let lastError: Error | null = null

export interface BotStatus {
  platform: string
  status: 'connected' | 'disconnected' | 'connecting'
  uptime?: number
  messagesProcessed: number
  error?: string
}

export async function startBot(clientId: string, clientSecret: string): Promise<void> {
  if (!clientId || !clientSecret) {
    const msg = '钉钉 Client ID 或 Client Secret 为空，跳过启动'
    console.warn(`[DingTalk Bot] ${msg}`)
    BotLogger.log({ platform: 'dingtalk', eventType: 'error', severity: 'warning', message: msg })
    return
  }

  // 幂等检查：如果已有活跃连接且凭据未变，直接跳过
  if (client && currentClientId === clientId && currentClientSecret === clientSecret) {
    console.log('[DingTalk Bot] 已有活跃连接，跳过重复启动')
    return
  }

  // 如果已有旧连接（凭据变更），先停止
  if (client) {
    console.log('[DingTalk Bot] 凭据已变更，先停止旧连接')
    await stopBot()
  }

  currentClientId = clientId
  currentClientSecret = clientSecret

  try {
    const newClient = new DWClient({
      clientId,
      clientSecret,
      debug: false,
    })

    newClient.registerCallbackListener(TOPIC_ROBOT, handleRobotCallback(newClient, () => { messagesProcessed++ }))

    newClient.registerAllEventListener(() => {
      return { status: EventAck.SUCCESS }
    })

    // 先设置 client，再 connect，保证闭包和模块变量指向同一实例
    client = newClient
    client.connect()
    startTime = Date.now()
    lastError = null
    console.log('[DingTalk Bot] 已启动，等待消息...')
    BotLogger.log({
      platform: 'dingtalk',
      eventType: 'connection',
      severity: 'info',
      message: '钉钉 Bot 已启动',
    })
  } catch (err) {
    const error = err instanceof Error ? err : new Error(String(err))
    lastError = error
    client = null
    currentClientId = ''
    currentClientSecret = ''
    console.error('[DingTalk Bot] 启动失败:', error.message)
    BotLogger.log({
      platform: 'dingtalk',
      eventType: 'error',
      severity: 'error',
      message: `钉钉 Bot 启动失败: ${error.message}`,
      details: { hint: '请检查 Client ID 和 Client Secret 是否正确' },
    })
    throw error
  }
}

export async function stopBot(): Promise<void> {
  closeConnectionsForPlatform('dingtalk')
  if (client) {
    client.disconnect()
    client = null
    currentClientId = ''
    currentClientSecret = ''
    startTime = 0
    console.log('[DingTalk Bot] 已停止')
    BotLogger.log({
      platform: 'dingtalk',
      eventType: 'disconnection',
      severity: 'info',
      message: '钉钉 Bot 已停止',
    })
  }
}

export function getStatus(): BotStatus {
  return {
    platform: 'dingtalk',
    status: client ? 'connected' : 'disconnected',
    uptime: client && startTime ? Math.floor((Date.now() - startTime) / 1000) : undefined,
    messagesProcessed,
    error: lastError?.message,
  }
}

const configManager = ConfigManager.getInstance()
configManager.on('config-changed', async (event: ConfigChangeEvent) => {
  const { newConfig } = event
  const platformConfig = newConfig.dingtalk

  try {
    if (platformConfig.enabled && !client) {
      await startBot(platformConfig.clientId, platformConfig.clientSecret)
    } else if (!platformConfig.enabled && client) {
      await stopBot()
    } else if (platformConfig.enabled && client) {
      if (platformConfig.clientId !== currentClientId || platformConfig.clientSecret !== currentClientSecret) {
        await stopBot()
        await startBot(platformConfig.clientId, platformConfig.clientSecret)
      }
    }
    lastError = null
  } catch (error) {
    lastError = error instanceof Error ? error : new Error(String(error))
    BotLogger.log({
      platform: 'dingtalk',
      eventType: 'error',
      severity: 'error',
      message: `配置变更处理失败: ${lastError.message}`,
    })
  }
})