import type { Memory, ValueSelector, Var } from '../../types'
import type { QuestionClassifierNodeType, Topic } from './types'
import { produce } from 'immer'
import { startTransition, useCallback, useEffect, useRef } from 'react'
import { useUpdateNodeInternals } from 'reactflow'
import { checkHasQueryBlock } from '@/app/components/base/prompt-editor/constants'
import { ModelTypeEnum } from '@/app/components/header/account-setting/model-provider-page/declarations'
import { useModelListAndDefaultModelAndCurrentProviderAndModel } from '@/app/components/header/account-setting/model-provider-page/hooks'
import { useHooksStore } from '@/app/components/workflow/hooks-store/store'
import useNodeCrud from '@/app/components/workflow/nodes/_base/hooks/use-node-crud'
import { AppModeEnum } from '@/types/app'
import { FlowType } from '@/types/common'
import { useIsChatMode, useNodesReadOnly, useWorkflow } from '../../hooks'
import useConfigVision from '../../hooks/use-config-vision'
import { useStore } from '../../store'
import { BlockEnum, VarType } from '../../types'
import useAvailableVarList from '../_base/hooks/use-available-var-list'

const useConfig = (id: string, payload: QuestionClassifierNodeType) => {
  const updateNodeInternals = useUpdateNodeInternals()
  const { nodesReadOnly: readOnly } = useNodesReadOnly()
  const isChatMode = useIsChatMode()
  const flowType = useHooksStore((s) => s.configsMap?.flowType)
  const isSnippetFlow = flowType === FlowType.snippet
  const defaultConfig = useStore((s) => s.nodesDefaultConfigs)?.[payload.type]
  const { getBeforeNodesInSameBranch } = useWorkflow()
  const startNode = getBeforeNodesInSameBranch(id).find(
    (node) => node.data.type === BlockEnum.Start,
  )
  const startNodeId = startNode?.id
  const { inputs, setInputs: doSetInputs } = useNodeCrud<QuestionClassifierNodeType>(id, payload)
  const inputRef = useRef(inputs)
  const setInputs = useCallback(
    (newInputs: QuestionClassifierNodeType) => {
      doSetInputs(newInputs)
      inputRef.current = newInputs
    },
    [doSetInputs],
  )
  useEffect(() => {
    inputRef.current = inputs
  }, [inputs])

  const isHandlingModelChangeRef = useRef(false)
  const { currentProvider, currentModel } = useModelListAndDefaultModelAndCurrentProviderAndModel(
    ModelTypeEnum.textGeneration,
  )

  const model = inputs.model
  const modelMode = inputs.model?.mode
  const isChatModel = modelMode === AppModeEnum.CHAT

  const handleVisionChange = useCallback(
    (newPayload: QuestionClassifierNodeType['vision']) => {
      const newInputs = produce(inputRef.current, (draft) => {
        draft.vision = newPayload
      })
      setInputs(newInputs)
    },
    [setInputs],
  )

  const {
    isVisionModel,
    handleVisionResolutionEnabledChange,
    handleVisionResolutionChange,
    handleModelChanged: handleVisionConfigAfterModelChanged,
  } = useConfigVision(model, {
    payload: inputs.vision,
    onChange: handleVisionChange,
  })

  const handleModelChanged = useCallback(
    (model: { provider: string; modelId: string; mode?: string }) => {
      const newInputs = produce(inputRef.current, (draft) => {
        draft.model.provider = model.provider
        draft.model.name = model.modelId
        draft.model.mode = model.mode!
      })
      isHandlingModelChangeRef.current = true
      setInputs(newInputs)
    },
    [setInputs],
  )

  useEffect(() => {
    if (currentProvider?.provider && currentModel?.model && !model.provider) {
      startTransition(() => {
        handleModelChanged({
          provider: currentProvider?.provider,
          modelId: currentModel?.model,
          mode: currentModel?.model_properties?.mode as string | undefined,
        })
      })
    }
  }, [model.provider, currentProvider, currentModel, handleModelChanged])

  const handleCompletionParamsChange = useCallback(
    (newParams: Record<string, unknown>) => {
      const newInputs = produce(inputs, (draft) => {
        draft.model.completion_params = newParams
      })
      setInputs(newInputs)
    },
    [inputs, setInputs],
  )

  // change to vision model to set vision enabled, else disabled
  useEffect(() => {
    if (!isHandlingModelChangeRef.current) return
    isHandlingModelChangeRef.current = false
    startTransition(() => {
      handleVisionConfigAfterModelChanged()
    })
  }, [handleVisionConfigAfterModelChanged, isVisionModel])

  const handleQueryVarChange = useCallback(
    (newVar: ValueSelector | string) => {
      const newInputs = produce(inputs, (draft) => {
        draft.query_variable_selector = newVar as ValueSelector
      })
      setInputs(newInputs)
    },
    [inputs, setInputs],
  )

  useEffect(() => {
    const isReady = defaultConfig && Object.keys(defaultConfig).length > 0
    if (!isReady) return

    const currentInputs = inputRef.current
    let shouldUpdate = false

    const nextInputs = produce(currentInputs, (draft) => {
      if (!draft.model) draft.model = defaultConfig.model

      if (!draft.classes) draft.classes = defaultConfig.classes

      if (!draft._targetBranches) draft._targetBranches = defaultConfig._targetBranches

      if (!draft.vision) draft.vision = defaultConfig.vision

      if (
        !isSnippetFlow &&
        draft.query_variable_selector.length === 0 &&
        isChatMode &&
        startNodeId
      ) {
        draft.query_variable_selector = [startNodeId, 'sys.query']
        shouldUpdate = true
      }

      if (!currentInputs.model && defaultConfig.model) shouldUpdate = true

      if (!currentInputs.classes && defaultConfig.classes) shouldUpdate = true

      if (!currentInputs._targetBranches && defaultConfig._targetBranches) shouldUpdate = true

      if (!currentInputs.vision && defaultConfig.vision) shouldUpdate = true
    })

    if (!shouldUpdate) return

    startTransition(() => {
      setInputs(nextInputs)
    })
  }, [defaultConfig, isChatMode, isSnippetFlow, setInputs, startNodeId])

  const handleClassesChange = useCallback(
    (newClasses: Topic[]) => {
      const newInputs = produce(inputs, (draft) => {
        draft.classes = newClasses
        draft._targetBranches = newClasses.map((item: Topic) => ({
          id: item.id,
          name: item.name,
        }))
      })
      setInputs(newInputs)
    },
    [inputs, setInputs],
  )

  const filterInputVar = useCallback((varPayload: Var) => {
    return [VarType.number, VarType.string].includes(varPayload.type)
  }, [])

  const filterVisionInputVar = useCallback((varPayload: Var) => {
    return [VarType.file, VarType.arrayFile].includes(varPayload.type)
  }, [])

  const { availableVars, availableNodesWithParent } = useAvailableVarList(id, {
    onlyLeafNodeVar: false,
    filterVar: filterInputVar,
  })

  const { availableVars: availableVisionVars } = useAvailableVarList(id, {
    onlyLeafNodeVar: false,
    filterVar: filterVisionInputVar,
  })

  const hasSetBlockStatus = {
    history: false,
    query: isChatMode ? checkHasQueryBlock(inputs.instruction) : false,
    context: false,
  }

  const handleInstructionChange = useCallback(
    (instruction: string) => {
      const newInputs = produce(inputs, (draft) => {
        draft.instruction = instruction
      })
      setInputs(newInputs)
    },
    [inputs, setInputs],
  )

  const handleMemoryChange = useCallback(
    (memory?: Memory) => {
      const newInputs = produce(inputs, (draft) => {
        draft.memory = memory
      })
      setInputs(newInputs)
    },
    [inputs, setInputs],
  )

  const filterVar = useCallback((varPayload: Var) => {
    return varPayload.type === VarType.string
  }, [])

  const handleSortTopic = useCallback(
    (newTopics: (Topic & { id: string })[]) => {
      const newInputs = produce(inputs, (draft) => {
        const sortedTopics = newTopics.filter(Boolean)
        draft.classes = sortedTopics.map((item) => ({
          id: item.id,
          name: item.name,
          label: item.label,
        }))
        draft._targetBranches = sortedTopics.map((item) => ({
          id: item.id,
          name: item.name,
        }))
      })
      setInputs(newInputs)
      updateNodeInternals(id)
    },
    [id, inputs, setInputs, updateNodeInternals],
  )

  return {
    readOnly,
    inputs,
    handleModelChanged,
    isChatMode,
    isChatModel,
    handleCompletionParamsChange,
    handleQueryVarChange,
    filterVar,
    handleTopicsChange: handleClassesChange,
    hasSetBlockStatus,
    availableVars,
    availableNodesWithParent,
    availableVisionVars,
    handleInstructionChange,
    handleMemoryChange,
    isVisionModel,
    handleVisionResolutionEnabledChange,
    handleVisionResolutionChange,
    handleSortTopic,
  }
}

export default useConfig