# All files / src/hooks useDatabaseOperations.ts

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     import { useState, useCallback } from 'react'
    import { toast } from 'sonner'
    import {
      getDatabaseStats,
      exportDatabase,
      importDatabase,
      clearDatabase,
      seedDatabase,
      validateDatabaseSchema
    } from '@/lib/db'

    export function useDatabaseOperations() {
      const [stats, setStats] = useState<{
        snippetCount: number
        templateCount: number
        storageType: 'indexeddb' | 'localstorage' | 'none'
        databaseSize: number
      } | null>(null)
      const [loading, setLoading] = useState(true)
      const [schemaHealth, setSchemaHealth] = useState<'unknown' | 'healthy' | 'corrupted'>('unknown')
      const [checkingSchema, setCheckingSchema] = useState(false)

      const loadStats = useCallback(async () => {
        setLoading(true)
        try {
          const data = await getDatabaseStats()
          setStats(data)
        } catch (error) {
          console.error('Failed to load stats:', error)
          toast.error('Failed to load database statistics')
        } finally {
          setLoading(false)
        }
      }, [])

      const checkSchemaHealth = useCallback(async () => {
        setCheckingSchema(true)
        try {
          const result = await validateDatabaseSchema()
          setSchemaHealth(result ? 'healthy' : 'corrupted')
        } catch (error) {
          console.error('Schema check failed:', error)
          setSchemaHealth('corrupted')
        } finally {
          setCheckingSchema(false)
        }
      }, [])

      const handleExport = useCallback(async () => {
        try {
          const jsonData = await exportDatabase()
          const blob = new Blob([jsonData], { type: 'application/json' })
          const url = URL.createObjectURL(blob)
          const a = document.createElement('a')
          a.href = url
          a.download = `codesnippet-backup-${Date.now()}.json`
          document.body.appendChild(a)
          a.click()
          document.body.removeChild(a)
          URL.revokeObjectURL(url)
          toast.success('Database exported successfully')
        } catch (error) {
          console.error('Failed to export:', error)
          toast.error('Failed to export database')
        }
      }, [])

      const handleImport = useCallback(async (event: React.ChangeEvent<HTMLInputElement>) => {
        const file = event.target.files?.[0]
        if (!file) return

        try {
          const text = await file.text()
          await importDatabase(text)
          toast.success('Database imported successfully')
          await loadStats()
        } catch (error) {
          console.error('Failed to import:', error)
          toast.error('Failed to import database')
        }

        event.target.value = ''
      }, [loadStats])

      const handleClear = useCallback(async () => {
        if (!confirm('Are you sure you want to clear all data? This cannot be undone.')) {
          return
        }

        try {
          await clearDatabase()
          toast.success('Database cleared and schema recreated successfully')
          await loadStats()
          await checkSchemaHealth()
        } catch (error) {
          console.error('Failed to clear:', error)
          toast.error('Failed to clear database')
        }
      }, [loadStats, checkSchemaHealth])

      const handleSeed = useCallback(async () => {
        try {
          await seedDatabase()
          toast.success('Sample data added successfully')
          await loadStats()
        } catch (error) {
          console.error('Failed to seed:', error)
          toast.error('Failed to add sample data')
        }
      }, [loadStats])

      const formatBytes = useCallback((bytes: number) => {
        if (bytes === 0) return '0 Bytes'
        const k = 1024
        const sizes = ['Bytes', 'KB', 'MB', 'GB']
        const i = Math.floor(Math.log(bytes) / Math.log(k))
        return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i]
      }, [])

      return {
        stats,
        loading,
        schemaHealth,
        checkingSchema,
        loadStats,
        checkSchemaHealth,
        handleExport,
        handleImport,
        handleClear,
        handleSeed,
        formatBytes,
      }
    }