import { useCallback } from 'react'

import { HuggingFaceRepoData } from '@janhq/core'
import { useQueryClient } from '@tanstack/react-query'

import { toaster } from '@/containers/Toast'

import { fetchHuggingFaceRepoData } from '@/utils/huggingface'

import { fetchHuggingFaceRepoDataQueryKey } from './useHfRepoDataQuery'
import useModelDownloadMutation from './useModelDownloadMutation'

/**
 * Fetches the data for a Hugging Face model and downloads it.
 * This function will query local cache data first, before send request
 * to HuggingFace to prevent unnecessary requests.
 *
 * @param modelHandle The model handle to fetch and download. E.g: "NousResearch/Hermes-2-Theta-Llama-3-8B-GGUF"
 */
const useHfModelFetchAndDownload = () => {
  const downloadModelMutation = useModelDownloadMutation()
  const queryClient = useQueryClient()

  const fetchData = useCallback(
    async (modelHandle: string): Promise<HuggingFaceRepoData | undefined> => {
      const data = queryClient.getQueryData([
        ...fetchHuggingFaceRepoDataQueryKey,
        modelHandle,
      ])

      if (data) return data as HuggingFaceRepoData
      console.debug(`No cache data found for ${modelHandle}`)
      const repoData = await fetchHuggingFaceRepoData(modelHandle)
      await queryClient.setQueryData(
        [...fetchHuggingFaceRepoDataQueryKey, data],
        repoData
      )
      return repoData
    },
    [queryClient]
  )

  const fetchDataAndDownload = useCallback(
    async (modelHandle: string) => {
      const repoData = await fetchData(modelHandle)
      if (!repoData) {
        console.error(`Could not fetch data for repo ${modelHandle}`)
        toaster({
          title: `Failed to get data`,
          description: `Could not get data for repo ${modelHandle}`,
          type: 'error',
        })
        return
      }

      const recommendedQuant = 'Q4_K_S'
      let recommendedModel = repoData.siblings.find(
        (sibling) =>
          sibling.quantization?.toLowerCase() === recommendedQuant.toLowerCase()
      )

      if (!recommendedModel) {
        console.debug('Q4_K_S model not found. Try with smallest model')
        // get filesize min from repoData.siblings

        repoData.siblings
          .filter((sibling) => {
            sibling.fileSize != null && sibling.quantization != null
          })
          .sort((a, b) => a.fileSize! - b.fileSize!)
        recommendedModel = repoData.siblings[0]
        console.debug('Min size recommended model:', recommendedModel)
      }

      if (!recommendedModel) {
        toaster({
          title: `Failed to get recommended model`,
          description: `Could not get recommended model for repo ${modelHandle}. Please open the details page and select model manually!`,
          type: 'error',
        })
        return
      }

      const persistModelId = modelHandle
        .replaceAll('/', '_')
        .concat('_')
        .concat(recommendedModel.rfilename)

      downloadModelMutation.mutate({
        modelId: modelHandle,
        fileName: recommendedModel.rfilename,
        persistedModelId: persistModelId,
      })
    },

    [fetchData, downloadModelMutation]
  )

  return { fetchDataAndDownload }
}

export default useHfModelFetchAndDownload