import type { Message } from 'ai'
import { appendResponseMessages, appendClientMessage, streamText } from 'ai'
import { createWorkersAI } from 'workers-ai-provider'
import { loadChat } from '~~/server/utils/chat'

export default defineEventHandler(async (event) => {
  const { id, message, model, agent } = await readBody(event)

  console.log(model, agent)

  const workersAI = createWorkersAI({ binding: hubAI() })

  const previousMessages = await loadChat(id)

  const messages = appendClientMessage({
    messages: previousMessages,
    message
  })

  const result = streamText({
    model: workersAI('@cf/meta/llama-3.1-8b-instruct'),
    // system, TODO: add system
    // prompt, TODO: add prompt
    messages,
    // tools, TODO: add tools
    async onFinish({ response }) {
      await saveChat({
        id,
        messages: appendResponseMessages({
          messages,
          responseMessages: response.messages
        })
      })
    }
  })

  result.consumeStream()

  return result.toDataStreamResponse()
})

async function saveChat({ id, messages }: { id: string, messages: Message[] }) {
  const hub = hubBlob()

  await hub.delete(`chats/${id}.json`)
  await $fetch('/api/chats', {
    method: 'POST',
    body: {
      file: {
        name: `${id}.json`,
        content: JSON.stringify(messages, null, 2)
      }
    }
  })
}