import { useCallback } from 'react'
import { produce } from 'immer'
import { useTranslation } from 'react-i18next'
import type { HttpMethod, WebhookHeader, WebhookParameter, WebhookTriggerNodeType } from './types'

import { useNodesReadOnly, useWorkflow } from '@/app/components/workflow/hooks'
import useNodeCrud from '@/app/components/workflow/nodes/_base/hooks/use-node-crud'
import { useStore as useAppStore } from '@/app/components/app/store'
import { fetchWebhookUrl } from '@/service/apps'
import type { Variable } from '@/app/components/workflow/types'
import { VarType } from '@/app/components/workflow/types'
import Toast from '@/app/components/base/toast'
import { checkKeys, hasDuplicateStr } from '@/utils/var'
import { WEBHOOK_RAW_VARIABLE_NAME } from './utils/raw-variable'

const useConfig = (id: string, payload: WebhookTriggerNodeType) => {
  const { t } = useTranslation()
  const { nodesReadOnly: readOnly } = useNodesReadOnly()
  const { inputs, setInputs } = useNodeCrud<WebhookTriggerNodeType>(id, payload)
  const appId = useAppStore.getState().appDetail?.id
  const { isVarUsedInNodes, removeUsedVarInNodes } = useWorkflow()

  const handleMethodChange = useCallback((method: HttpMethod) => {
    setInputs(produce(inputs, (draft) => {
      draft.method = method
    }))
  }, [inputs, setInputs])

  const handleContentTypeChange = useCallback((contentType: string) => {
    setInputs(produce(inputs, (draft) => {
      const previousContentType = draft.content_type
      draft.content_type = contentType

      // If the content type changes, reset body parameters and their variables, as the variable types might differ.
      // However, we could consider retaining variables that are compatible with the new content type later.
      if (previousContentType !== contentType) {
        draft.body = []
        if (draft.variables) {
          const bodyVariables = draft.variables.filter(v => v.label === 'body')
          bodyVariables.forEach((v) => {
            if (isVarUsedInNodes([id, v.variable]))
              removeUsedVarInNodes([id, v.variable])
          })

          draft.variables = draft.variables.filter(v => v.label !== 'body')
        }
      }
    }))
  }, [inputs, setInputs, id, isVarUsedInNodes, removeUsedVarInNodes])

  const syncVariablesInDraft = useCallback((
    draft: WebhookTriggerNodeType,
    newData: (WebhookParameter | WebhookHeader)[],
    sourceType: 'param' | 'header' | 'body',
  ) => {
    if (!draft.variables)
      draft.variables = []

    const sanitizedEntries = newData.map(item => ({
      item,
      sanitizedName: sourceType === 'header' ? item.name.replace(/-/g, '_') : item.name,
    }))

    const hasReservedConflict = sanitizedEntries.some(entry => entry.sanitizedName === WEBHOOK_RAW_VARIABLE_NAME)
    if (hasReservedConflict) {
      Toast.notify({
        type: 'error',
        message: t('appDebug.varKeyError.keyAlreadyExists', {
          key: t('appDebug.variableConfig.varName'),
        }),
      })
      return false
    }
    const existingOtherVarNames = new Set(
      draft.variables
        .filter(v => v.label !== sourceType && v.variable !== WEBHOOK_RAW_VARIABLE_NAME)
        .map(v => v.variable),
    )

    const crossScopeConflict = sanitizedEntries.find(entry => existingOtherVarNames.has(entry.sanitizedName))
    if (crossScopeConflict) {
      Toast.notify({
        type: 'error',
        message: t('appDebug.varKeyError.keyAlreadyExists', {
          key: crossScopeConflict.sanitizedName,
        }),
      })
      return false
    }

    if(hasDuplicateStr(sanitizedEntries.map(entry => entry.sanitizedName))) {
      Toast.notify({
        type: 'error',
        message: t('appDebug.varKeyError.keyAlreadyExists', {
          key: t('appDebug.variableConfig.varName'),
        }),
      })
      return false
    }

    for (const { sanitizedName } of sanitizedEntries) {
      const { isValid, errorMessageKey } = checkKeys([sanitizedName], false)
      if (!isValid) {
        Toast.notify({
          type: 'error',
          message: t(`appDebug.varKeyError.${errorMessageKey}`, {
            key: t('appDebug.variableConfig.varName'),
          }),
        })
        return false
      }
    }

    // Create set of new variable names for this source
    const newVarNames = new Set(sanitizedEntries.map(entry => entry.sanitizedName))

    // Find variables from current source that will be deleted and clean up references
    draft.variables
      .filter(v => v.label === sourceType && !newVarNames.has(v.variable))
      .forEach((v) => {
        // Clean up references if variable is used in other nodes
        if (isVarUsedInNodes([id, v.variable]))
          removeUsedVarInNodes([id, v.variable])
      })

    // Remove variables that no longer exist in newData for this specific source type
    draft.variables = draft.variables.filter((v) => {
      // Keep variables from other sources
      if (v.label !== sourceType) return true
      return newVarNames.has(v.variable)
    })

    // Add or update variables
    sanitizedEntries.forEach(({ item, sanitizedName }) => {
      const existingVarIndex = draft.variables.findIndex(v => v.variable === sanitizedName)

      const inputVarType = 'type' in item
        ? item.type
        : VarType.string // Default to string for headers

      const newVar: Variable = {
        value_type: inputVarType,
        label: sourceType, // Use sourceType as label to identify source
        variable: sanitizedName,
        value_selector: [],
        required: item.required,
      }

      if (existingVarIndex >= 0)
        draft.variables[existingVarIndex] = newVar
      else
        draft.variables.push(newVar)
    })
    return true
  }, [t, id, isVarUsedInNodes, removeUsedVarInNodes])

  const handleParamsChange = useCallback((params: WebhookParameter[]) => {
    setInputs(produce(inputs, (draft) => {
      draft.params = params
      syncVariablesInDraft(draft, params, 'param')
    }))
  }, [inputs, setInputs, syncVariablesInDraft])

  const handleHeadersChange = useCallback((headers: WebhookHeader[]) => {
    setInputs(produce(inputs, (draft) => {
      draft.headers = headers
      syncVariablesInDraft(draft, headers, 'header')
    }))
  }, [inputs, setInputs, syncVariablesInDraft])

  const handleBodyChange = useCallback((body: WebhookParameter[]) => {
    setInputs(produce(inputs, (draft) => {
      draft.body = body
      syncVariablesInDraft(draft, body, 'body')
    }))
  }, [inputs, setInputs, syncVariablesInDraft])

  const handleAsyncModeChange = useCallback((asyncMode: boolean) => {
    setInputs(produce(inputs, (draft) => {
      draft.async_mode = asyncMode
    }))
  }, [inputs, setInputs])

  const handleStatusCodeChange = useCallback((statusCode: number) => {
    setInputs(produce(inputs, (draft) => {
      draft.status_code = statusCode
    }))
  }, [inputs, setInputs])

  const handleStatusCodeBlur = useCallback((statusCode: number) => {
    // Only clamp when user finishes editing (on blur)
    const clampedStatusCode = Math.min(Math.max(statusCode, 200), 399)

    setInputs(produce(inputs, (draft) => {
      draft.status_code = clampedStatusCode
    }))
  }, [inputs, setInputs])

  const handleResponseBodyChange = useCallback((responseBody: string) => {
    setInputs(produce(inputs, (draft) => {
      draft.response_body = responseBody
    }))
  }, [inputs, setInputs])

  const generateWebhookUrl = useCallback(async () => {
    // Idempotency: if we already have a URL, just return it.
    if (inputs.webhook_url && inputs.webhook_url.length > 0)
      return

    if (!appId)
      return

    try {
      // Call backend to generate or fetch webhook url for this node
      const response = await fetchWebhookUrl({ appId, nodeId: id })

      const newInputs = produce(inputs, (draft) => {
        draft.webhook_url = response.webhook_url
        draft.webhook_debug_url = response.webhook_debug_url
      })
      setInputs(newInputs)
    }
    catch (error: unknown) {
      // Fallback to mock URL when API is not ready or request fails
      // Keep the UI unblocked and allow users to proceed in local/dev environments.
      console.error('Failed to generate webhook URL:', error)
      const newInputs = produce(inputs, (draft) => {
        draft.webhook_url = ''
      })
      setInputs(newInputs)
    }
  }, [appId, id, inputs, setInputs])

  return {
    readOnly,
    inputs,
    setInputs,
    handleMethodChange,
    handleContentTypeChange,
    handleHeadersChange,
    handleParamsChange,
    handleBodyChange,
    handleAsyncModeChange,
    handleStatusCodeChange,
    handleStatusCodeBlur,
    handleResponseBodyChange,
    generateWebhookUrl,
  }
}

export default useConfig