export const useUnits = () => {
  const supabase = useSupabase()

  /**
   * Get all units
   */
  const getUnits = async () => {
    const { data, error } = await supabase
      .from('units')
      .select('*')
      .order('unit_type', { ascending: true })
      .order('name', { ascending: true })

    if (error) {
      console.error('Error fetching units:', error)
      return { data: null, error }
    }

    return { data, error: null }
  }

  /**
   * Get default unit for a type
   */
  const getDefaultUnit = async (unitType: 'weight' | 'volume' | 'count' | 'custom') => {
    const { data, error } = await supabase
      .from('units')
      .select('*')
      .eq('unit_type', unitType)
      .eq('is_default', true)
      .single()

    if (error) {
      console.error('Error fetching default unit:', error)
      return { data: null, error }
    }

    return { data, error: null }
  }

  /**
   * Convert quantity between units
   */
  const convertUnit = (quantity: number, fromFactor: number, toFactor: number): number => {
    return (quantity * fromFactor) / toFactor
  }

  return {
    getUnits,
    getDefaultUnit,
    convertUnit
  }
}