# All files / src/components/features/namespace-manager NamespaceSelector.tsx

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     import { useState, useEffect, useCallback } from 'react'
    import {
      Select,
      SelectContent,
      SelectItem,
      SelectTrigger,
      SelectValue,
    } from '@/components/ui/select'
    import { Folder } from '@phosphor-icons/react'
    import { toast } from 'sonner'
    import { Namespace } from '@/lib/types'
    import {
      getAllNamespaces,
      createNamespace,
      deleteNamespace,
    } from '@/lib/db'
    import { CreateNamespaceDialog } from './CreateNamespaceDialog'
    import { DeleteNamespaceDialog } from './DeleteNamespaceDialog'

    interface NamespaceSelectorProps {
      selectedNamespaceId: string | null
      onNamespaceChange: (namespaceId: string) => void
    }

    export function NamespaceSelector({ selectedNamespaceId, onNamespaceChange }: NamespaceSelectorProps) {
      const [namespaces, setNamespaces] = useState<Namespace[]>([])
      const [newNamespaceName, setNewNamespaceName] = useState('')
      const [createDialogOpen, setCreateDialogOpen] = useState(false)
      const [deleteDialogOpen, setDeleteDialogOpen] = useState(false)
      const [namespaceToDelete, setNamespaceToDelete] = useState<Namespace | null>(null)
      const [loading, setLoading] = useState(false)

      const loadNamespaces = useCallback(async () => {
        try {
          const loadedNamespaces = await getAllNamespaces()
          setNamespaces(loadedNamespaces)

          if (!selectedNamespaceId && loadedNamespaces.length > 0) {
            const defaultNamespace = loadedNamespaces.find(n => n.isDefault)
            if (defaultNamespace) {
              onNamespaceChange(defaultNamespace.id)
            }
          }
        } catch (error) {
          console.error('Failed to load namespaces:', error)
          toast.error('Failed to load namespaces')
        }
      }, [onNamespaceChange, selectedNamespaceId])

      useEffect(() => {
        loadNamespaces()
      }, [loadNamespaces])

      const handleCreateNamespace = async () => {
        if (!newNamespaceName.trim()) {
          toast.error('Please enter a namespace name')
          return
        }

        setLoading(true)
        try {
          const newNamespace: Namespace = {
            id: Date.now().toString(),
            name: newNamespaceName.trim(),
            createdAt: Date.now(),
            isDefault: false,
          }
          await createNamespace(newNamespace)
          setNamespaces(prev => [...prev, newNamespace])
          setNewNamespaceName('')
          setCreateDialogOpen(false)
          toast.success('Namespace created')
        } catch (error) {
          console.error('Failed to create namespace:', error)
          toast.error('Failed to create namespace')
        } finally {
          setLoading(false)
        }
      }

      const handleDeleteNamespace = async () => {
        if (!namespaceToDelete) return

        setLoading(true)
        try {
          await deleteNamespace(namespaceToDelete.id)
          setNamespaces(prev => prev.filter(n => n.id !== namespaceToDelete.id))

          if (selectedNamespaceId === namespaceToDelete.id) {
            const defaultNamespace = namespaces.find(n => n.isDefault)
            if (defaultNamespace) {
              onNamespaceChange(defaultNamespace.id)
            }
          }

          setDeleteDialogOpen(false)
          setNamespaceToDelete(null)
          toast.success('Namespace deleted, snippets moved to default')
        } catch (error) {
          console.error('Failed to delete namespace:', error)
          toast.error('Failed to delete namespace')
        } finally {
          setLoading(false)
        }
      }

      const selectedNamespace = namespaces.find(n => n.id === selectedNamespaceId)

      return (
        <div className="flex items-center gap-2">
          <div className="flex items-center gap-2 text-muted-foreground">
            <Folder weight="fill" className="h-4 w-4" aria-hidden="true" />
            <span className="text-sm font-medium">Namespace:</span>
          </div>

          <Select
            value={selectedNamespaceId || undefined}
            onValueChange={onNamespaceChange}
          >
            <SelectTrigger
              className="w-[200px]"
              data-testid="namespace-selector-trigger"
              aria-label="Select namespace"
            >
              <SelectValue placeholder={selectedNamespace?.name || 'Select namespace'} />
            </SelectTrigger>
            <SelectContent data-testid="namespace-selector-content">
              {namespaces.map(namespace => (
                <SelectItem
                  key={namespace.id}
                  value={namespace.id}
                  data-testid={`namespace-option-${namespace.id}`}
                >
                  <div className="flex items-center gap-2">
                    <span>{namespace.name}</span>
                    {namespace.isDefault && (
                      <span className="text-xs text-muted-foreground">(Default)</span>
                    )}
                  </div>
                </SelectItem>
              ))}
            </SelectContent>
          </Select>

          <CreateNamespaceDialog
            open={createDialogOpen}
            onOpenChange={setCreateDialogOpen}
            namespaceName={newNamespaceName}
            onNamespaceNameChange={setNewNamespaceName}
            onCreateNamespace={handleCreateNamespace}
            loading={loading}
          />

          {selectedNamespace && !selectedNamespace.isDefault && (
            <DeleteNamespaceDialog
              open={deleteDialogOpen}
              onOpenChange={setDeleteDialogOpen}
              namespace={namespaceToDelete}
              onDeleteNamespace={handleDeleteNamespace}
              loading={loading}
              showTrigger
              onOpenDialog={() => {
                setNamespaceToDelete(selectedNamespace)
                setDeleteDialogOpen(true)
              }}
            />
          )}
        </div>
      )
    }