import type * as lark from '@larksuiteoapi/node-sdk'
import { HTTPClient } from '@/http'
import { getDefaultAgentId } from '@/app/api/nova-config'
import { getConversationId, setConversationId } from './user-store'
import { sendMessageAndWaitResponse } from '@/remote-control/shared/nova-bridge'
import { uploadBotAttachments, type BotAttachment } from '@/remote-control/shared/file-uploader'
import { BotLogger } from '@/remote-control/shared/logger'

const oapiClient = new HTTPClient({
  baseURL: process.env.NOVA_BASE_URL,
  headers: {
    'Content-Type': 'application/json',
    'Tenant-Id': process.env.NOVA_TENANT_ID!,
    'Authorization': process.env.NOVA_ACCESS_KEY!,
  },
})

const userQueues = new Map<string, Promise<void>>()
const processedMessages = new Set<string>()

function extractTextContent(messageType: string, content: string): string {
  try {
    const parsed = JSON.parse(content)

    if (messageType === 'text') {
      return (parsed.text || '').trim()
    }

    if (messageType === 'post') {
      // 富文本：遍历 content 数组提取 text 类型的文本
      const contentArray = parsed.content || []
      const texts: string[] = []
      for (const paragraph of contentArray) {
        if (Array.isArray(paragraph)) {
          for (const item of paragraph) {
            if (item.tag === 'text' && item.text) {
              texts.push(item.text)
            }
          }
        }
      }
      return texts.join(' ').trim()
    }

    return ''
  } catch {
    return ''
  }
}

function cleanMentions(text: string): string {
  // 清除 @_user_N 占位符
  return text.replace(/@_user_\d+/g, '').trim()
}

async function extractAttachments(
  client: lark.Client,
  messageType: string,
  content: string,
  messageId: string,
): Promise<BotAttachment[]> {
  const attachments: BotAttachment[] = []

  try {
    const parsed = JSON.parse(content)

    // 处理 image 类型
    if (messageType === 'image' && parsed.image_key) {
      const resp = await client.im.messageResource.get({
        path: { message_id: messageId, file_key: parsed.image_key },
        params: { type: 'image' },
      })
      const stream = resp.getReadableStream()
      const chunks: Buffer[] = []
      for await (const chunk of stream) {
        chunks.push(chunk)
      }
      const buffer = Buffer.concat(chunks)

      // 将 buffer 转为临时 URL（通过 data URI）
      const dataUri = `data:image/png;base64,${buffer.toString('base64')}`
      attachments.push({
        url: dataUri,
        fileName: `lark_image_${Date.now()}.png`,
      })
    }

    // 处理 file 类型
    if (messageType === 'file' && parsed.file_key) {
      const resp = await client.im.messageResource.get({
        path: { message_id: messageId, file_key: parsed.file_key },
        params: { type: 'file' },
      })
      const stream = resp.getReadableStream()
      const chunks: Buffer[] = []
      for await (const chunk of stream) {
        chunks.push(chunk)
      }
      const buffer = Buffer.concat(chunks)

      const dataUri = `data:application/octet-stream;base64,${buffer.toString('base64')}`
      attachments.push({
        url: dataUri,
        fileName: parsed.file_name || `lark_file_${Date.now()}`,
      })
    }

    // 处理 post 富文本中的图片
    if (messageType === 'post' && parsed.content) {
      for (const paragraph of parsed.content) {
        if (Array.isArray(paragraph)) {
          for (const item of paragraph) {
            if (item.tag === 'img' && item.image_key) {
              const resp = await client.im.messageResource.get({
                path: { message_id: messageId, file_key: item.image_key },
                params: { type: 'image' },
              })
              const stream = resp.getReadableStream()
              const chunks: Buffer[] = []
              for await (const chunk of stream) {
                chunks.push(chunk)
              }
              const buffer = Buffer.concat(chunks)

              const dataUri = `data:image/png;base64,${buffer.toString('base64')}`
              attachments.push({
                url: dataUri,
                fileName: `lark_post_image_${Date.now()}.png`,
              })
            }
          }
        }
      }
    }
  } catch (err) {
    console.error('[Lark Bot] 提取附件失败:', err)
  }

  return attachments
}

async function getOrCreateConversation(openId: string, name: string): Promise<string> {
  const existing = getConversationId(openId)
  if (existing) return existing

  const agentId = getDefaultAgentId()

  const res = await oapiClient.post<{ conversation_id: string }>(
    '/v1/oapi/super_agent/chat/create_conversation',
    {
      agent_id: agentId,
      title: `Lark User ${name || openId}`,
    },
  )

  const conversationId = res.conversation_id
  setConversationId(openId, conversationId, name)
  return conversationId
}

async function replyMessage(
  client: lark.Client,
  chatId: string,
  text: string,
): Promise<void> {
  // 检查文本中是否包含 Markdown 图片语法
  const imageRegex = /!\[([^\]]*)\]\(([^)]+)\)/g
  const images: Array<{ alt: string; url: string }> = []
  let match: RegExpExecArray | null

  while ((match = imageRegex.exec(text)) !== null) {
    images.push({ alt: match[1], url: match[2] })
  }

  // 如果包含图片，使用富文本消息
  if (images.length > 0) {
    // 移除 Markdown 图片语法，保留其他文本
    const textWithoutImages = text.replace(imageRegex, '').trim()

    // 构建富文本内容
    const content: any[][] = []

    // 添加文本段落
    if (textWithoutImages) {
      const lines = textWithoutImages.split('\n').filter(line => line.trim())
      for (const line of lines) {
        content.push([{ tag: 'text', text: line }])
      }
    }

    // 上传图片并添加到富文本中
    for (const image of images) {
      try {
        // 下载图片
        const response = await fetch(image.url)
        const buffer = Buffer.from(await response.arrayBuffer())

        // 上传到飞书
        const uploadResp = await client.im.image.create({
          data: {
            image_type: 'message',
            image: buffer,
          },
        })

        const imageKey = uploadResp.image_key || uploadResp.data?.image_key
        if (imageKey) {
          // 添加图片到富文本
          content.push([{ tag: 'img', image_key: imageKey }])
        } else {
          // 如果没有 image_key，添加链接
          content.push([{ tag: 'a', text: image.alt || '查看图片', href: image.url }])
        }
      } catch (err) {
        console.error('[Lark Bot] 上传图片失败:', err)
        // 上传失败，添加图片链接
        content.push([{ tag: 'a', text: image.alt || '查看图片', href: image.url }])
      }
    }

    // 飞书富文本格式需要包含语言标识
    await client.im.message.create({
      params: { receive_id_type: 'chat_id' },
      data: {
        receive_id: chatId,
        content: JSON.stringify({
          zh_cn: {
            title: '',
            content: content
          }
        }),
        msg_type: 'post',
      },
    })
  } else {
    // 纯文本消息
    await client.im.message.create({
      params: { receive_id_type: 'chat_id' },
      data: {
        receive_id: chatId,
        content: JSON.stringify({ text }),
        msg_type: 'text',
      },
    })
  }
}

async function processMessage(
  client: lark.Client,
  data: any,
  onMessage?: () => void,
): Promise<void> {
  const message = data.message
  const sender = data.sender
  const messageId = message.message_id
  const openId = sender.sender_id.open_id
  const name = sender.sender_id.union_id || openId
  const chatId = message.chat_id
  const messageType = message.message_type
  const content = message.content

  // 消息去重
  if (processedMessages.has(messageId)) {
    return
  }
  processedMessages.add(messageId)
  // 限制 Set 大小，防止内存泄漏
  if (processedMessages.size > 10000) {
    const firstItem = processedMessages.values().next().value
    if (firstItem) {
      processedMessages.delete(firstItem)
    }
  }

  // 提取文本和附件
  let text = extractTextContent(messageType, content)
  text = cleanMentions(text)

  const attachments = await extractAttachments(client, messageType, content, messageId)

  if (!text && attachments.length === 0) {
    return
  }

  BotLogger.log({
    platform: 'lark',
    eventType: 'message_received',
    severity: 'info',
    message: `收到来自 ${name} 的消息 (${messageType}, ${attachments.length} 附件)`,
    details: { openId, chatId },
  })

  try {
    // 上传附件
    let uploadFileIds: string[] | undefined
    if (attachments.length > 0) {
      uploadFileIds = await uploadBotAttachments(attachments)
      if (uploadFileIds.length === 0) uploadFileIds = undefined
    }

    const conversationId = await getOrCreateConversation(openId, name)
    const response = await sendMessageAndWaitResponse(
      `lark:${openId}`,
      conversationId,
      text || '',
      uploadFileIds,
    )

    if (!response) {
      await replyMessage(client, chatId, '没有收到回复，请稍后重试。')
    } else {
      await replyMessage(client, chatId, response)
    }

    if (onMessage) onMessage()

    BotLogger.log({
      platform: 'lark',
      eventType: 'message_sent',
      severity: 'info',
      message: `已回复用户 ${name}`,
    })
  } catch (error) {
    const errMsg = error instanceof Error ? error.message : '未知错误'
    console.error('[Lark Bot] 处理消息失败:', errMsg)
    await replyMessage(client, chatId, `处理消息时出错: ${errMsg}`).catch(() => {})
    BotLogger.log({
      platform: 'lark',
      eventType: 'error',
      severity: 'error',
      message: `处理消息失败: ${errMsg}`,
      details: { openId },
    })
  }
}

export function createEventHandler(client: lark.Client, onMessage?: () => void) {
  return async (data: any) => {
    const openId = data.sender?.sender_id?.open_id
    if (!openId) return

    // 使用队列确保单用户消息顺序处理
    const currentQueue = userQueues.get(openId) ?? Promise.resolve()
    const newQueue = currentQueue.then(() => processMessage(client, data, onMessage))
    userQueues.set(openId, newQueue)

    newQueue.finally(() => {
      if (userQueues.get(openId) === newQueue) {
        userQueues.delete(openId)
      }
    })
  }
}