Feat/environment variables in workflow (#6515)

Co-authored-by: JzoNg <jzongcode@gmail.com>

web/app/components/workflow/hooks/use-workflow-variables.ts

@@ -0,0 +1,69 @@
+import { useCallback } from 'react'
+import { useTranslation } from 'react-i18next'
+import { useStore } from '../store'
+import { getVarType, toNodeAvailableVars } from '@/app/components/workflow/nodes/_base/components/variable/utils'
+import type {
+  Node,
+  NodeOutPutVar,
+  ValueSelector,
+  Var,
+} from '@/app/components/workflow/types'
+
+export const useWorkflowVariables = () => {
+  const { t } = useTranslation()
+  const environmentVariables = useStore(s => s.environmentVariables)
+
+  const getNodeAvailableVars = useCallback(({
+    parentNode,
+    beforeNodes,
+    isChatMode,
+    filterVar,
+    hideEnv,
+  }: {
+    parentNode?: Node | null
+    beforeNodes: Node[]
+    isChatMode: boolean
+    filterVar: (payload: Var, selector: ValueSelector) => boolean
+    hideEnv?: boolean
+  }): NodeOutPutVar[] => {
+    return toNodeAvailableVars({
+      parentNode,
+      t,
+      beforeNodes,
+      isChatMode,
+      environmentVariables: hideEnv ? [] : environmentVariables,
+      filterVar,
+    })
+  }, [environmentVariables, t])
+
+  const getCurrentVariableType = useCallback(({
+    parentNode,
+    valueSelector,
+    isIterationItem,
+    availableNodes,
+    isChatMode,
+    isConstant,
+  }: {
+    valueSelector: ValueSelector
+    parentNode?: Node | null
+    isIterationItem?: boolean
+    availableNodes: any[]
+    isChatMode: boolean
+    isConstant?: boolean
+  }) => {
+    return getVarType({
+      parentNode,
+      valueSelector,
+      isIterationItem,
+      availableNodes,
+      isChatMode,
+      isConstant,
+      environmentVariables,
+    })
+  }, [environmentVariables])
+
+  return {
+    getNodeAvailableVars,
+    getCurrentVariableType,
+  }
+}