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import { FilterNavigation } from 'ish-core/models/filter-navigation/filter-navigation.model';
import { ProductView } from 'ish-core/models/product-view/product-view.model';
import { VariationProduct, VariationProductMaster } from 'ish-core/models/product/product.model';
import { omit } from 'ish-core/utils/functions';
import { VariationAttribute } from './variation-attribute.model';
import { VariationOptionGroup } from './variation-option-group.model';
import { VariationSelectOption } from './variation-select-option.model';
export class ProductVariationHelper {
/**
* Build select value structure
*/
static buildVariationOptionGroups(
variationProduct: VariationProduct,
productMaster: VariationProductMaster,
variations: VariationProduct[]
): VariationOptionGroup[] {
Iif (!variationProduct?.variableVariationAttributes?.length) {
return [];
}
// transform currently selected variation attribute list to object with the attributeId as key
const currentSettings = variationProduct.variableVariationAttributes.reduce<{ [id: string]: VariationAttribute }>(
(acc, attr) => ({
...acc,
[attr.variationAttributeId]: attr,
}),
{}
);
// transform all variation attribute values to selectOptions
// each with information about alternative combinations and active status (active status comes from currently selected variation)
const options: VariationSelectOption[] = (productMaster?.variationAttributeValues || [])
.map(attr => ({
label: ProductVariationHelper.toDisplayValue(attr.value),
value: ProductVariationHelper.toValue(attr.value)?.toString(),
type: attr.variationAttributeId,
metaData: attr.metaData,
active: ProductVariationHelper.isEqual(currentSettings?.[attr.variationAttributeId]?.value, attr.value),
}))
.map(option => ({
...option,
alternativeCombination: ProductVariationHelper.alternativeCombinationCheck(
option,
variationProduct,
variations
),
}));
// group options list by attributeId
const groupedOptions = groupBy(options, option => option.type);
// go through those groups and transform them to more complex objects
return Object.keys(groupedOptions).map(attrId => {
// we need to get one of the original attributes again here, because we lost the attribute name
const attribute = productMaster.variationAttributeValues.find(a => a.variationAttributeId === attrId);
return {
id: attribute.variationAttributeId,
label: attribute.name,
attributeType: attribute.attributeType,
options: groupedOptions[attrId],
};
});
}
static findPossibleVariation(
name: string,
value: string,
product: ProductView,
variations: VariationProduct[]
): string {
const target = omit(
ProductVariationHelper.simplifyVariableVariationAttributes(product.variableVariationAttributes),
name
);
const candidates = variations
.filter(variation =>
variation.variableVariationAttributes.some(
attr => attr.variationAttributeId === name && ProductVariationHelper.isEqual(attr.value, value)
)
)
.map(variation => ({
sku: variation.sku,
opts: omit(
ProductVariationHelper.simplifyVariableVariationAttributes(variation.variableVariationAttributes),
name
),
}));
if (candidates.length) {
return candidates.reduce((min, cur) =>
ProductVariationHelper.difference(cur.opts, target) < ProductVariationHelper.difference(min.opts, target)
? cur
: min
).sku;
}
return product.sku;
}
static hasDefaultVariation(product: ProductView): boolean {
return product && !!product.defaultVariationSKU;
}
static productVariationCount(variations: VariationProduct[], filters: FilterNavigation): number {
if (!variations?.length) {
return 0;
} else if (!filters?.filter) {
return variations?.length;
}
const selectedFacets = filters.filter
.map(filter => filter.facets.filter(facet => facet.selected).map(facet => facet.name))
.flat()
.map(selected => selected.split('='));
Iif (!selectedFacets.length) {
return variations?.length;
}
return variations
.map(p => p.variableVariationAttributes)
.filter(attrs =>
attrs.every(
attr =>
// attribute is not selected
!selectedFacets.find(([key]) => key === attr.variationAttributeId) ||
// selection is variation
selectedFacets.find(
([key, val]) => key === attr.variationAttributeId && ProductVariationHelper.isEqual(val, attr.value)
)
)
).length;
}
/**
* Check specific option if perfect variant match is not existing.
*
* @param option The select option to check.
* @param product The given product containing the related product variations
* @returns Indicates if no perfect match is found.
*/
private static alternativeCombinationCheck(
option: VariationSelectOption,
product: ProductView,
variations: VariationProduct[]
): boolean {
Iif (!product.variableVariationAttributes?.length) {
return;
}
const comparisonAttributes = product.variableVariationAttributes.map(attribute =>
attribute.variationAttributeId === option.type ? { ...attribute, value: option.value } : attribute
);
// check if the current product has the same attributes as the attributes to be compared
if (
ProductVariationHelper.variationAttributeArrayEquals(product.variableVariationAttributes, comparisonAttributes)
) {
// perfect match found
return false;
}
// check if one of the variation products has the same attributes as the attributes to be compared
return !variations.some(variation =>
ProductVariationHelper.variationAttributeArrayEquals(variation.variableVariationAttributes, comparisonAttributes)
);
}
// determines whether both arrays have the same variation attributes
private static variationAttributeArrayEquals(array1: VariationAttribute[], array2: VariationAttribute[]): boolean {
return (
Array.isArray(array1) &&
Array.isArray(array2) &&
array1.length === array2.length &&
array1.every(val =>
array2.find(
attribute => attribute.name === val.name && ProductVariationHelper.isEqual(attribute.value, val.value)
)
)
);
}
private static toValue(input: VariationAttribute['value']): string | number {
return typeof input === 'object' ? input.value : input;
}
private static toDisplayValue(input: VariationAttribute['value']): string {
return typeof input === 'object' ? `${input.value} ${input.unit}` : input.toString();
}
private static isEqual(obj1: VariationAttribute['value'], obj2: VariationAttribute['value']): boolean {
// eslint-disable-next-line eqeqeq -- needed for comparison of string, integers and floats
return ProductVariationHelper.toValue(obj1) == ProductVariationHelper.toValue(obj2);
}
private static simplifyVariableVariationAttributes(attrs: VariationAttribute[]): { [name: string]: string } {
return attrs
.map(attr => ({
name: attr.variationAttributeId,
value: attr.value,
}))
.reduce((acc, val) => ({ ...acc, [val.name]: val.value }), {});
}
private static difference(obj1: { [name: string]: string }, obj2: { [name: string]: string }): number {
const keys = Object.keys(obj1);
Iif (keys.length !== Object.keys(obj2).length || keys.some(k => Object.keys(obj2).indexOf(k) < 0)) {
throw new Error("cannot calculate difference if objects don't have the same keys");
}
return keys.reduce((sum, key) => (obj1[key] !== obj2[key] ? sum + 1 : sum), 0);
}
}
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