export interface SkuFeatureLike {
  featureName?: string | null
  featureValue: string
}

export const cleanFeatureValue = (value: string): string =>
  value.replace(/\.0(?=\D|$)/g, '')

export function splitQuantityFeature(features: SkuFeatureLike[]): {
  quantity: string
  others: string[]
} {
  if (!features || features.length === 0) {
    return { quantity: '', others: [] }
  }

  const quantityFeature = features.find((f) => f.featureName === 'quantity')
  const otherFeatures = features.filter((f) => f.featureName !== 'quantity')

  return {
    quantity: quantityFeature ? cleanFeatureValue(quantityFeature.featureValue) : '',
    others: otherFeatures.map((f) => cleanFeatureValue(f.featureValue)),
  }
}

/**
 * Builds the unit notation for a SKU: the quantity feature value only.
 * Falls back to joining all feature values when no quantity feature exists.
 */
export function composeUnitNotation(features: SkuFeatureLike[]): string {
  const { quantity, others } = splitQuantityFeature(features)
  if (quantity) return quantity
  if (others.length > 0) return others.join(' ')
  return ''
}

/**
 * Builds the display name for a SKU: the product name followed by the
 * values of all non-quantity features (values only).
 */
export function composeSkuName(baseName: string, features: SkuFeatureLike[]): string {
  const { others } = splitQuantityFeature(features)
  return [baseName, ...others].filter(Boolean).join(' ')
}