aswi2022code-of-duty-gitlab/frontend/src/features/TrackingTool/buildPathVariants.ts @ de12c6be

// Business logic for tracking tool

import { CatalogItemDto, PathDto } from '../../swagger/data-contracts'

// For more comprehensive code alias CatalogItemDto[] as path variant
export type PathVariant = MapPoint[]

export class MapPoint {
    constructor(
        public idx: number,
        public active: boolean,
        public catalogItem: CatalogItemDto
    ) { }

    /**
     * @returns true if the map point is displayable - i.e. it has a valid lat/lng
     */
    get displayable() {
        return !!this.catalogItem.latitude && !!this.catalogItem.longitude
    }
}

/**
 * Cartesian product of two arrays
 * @param sets
 * @returns
 */
const cartesianProduct = (sets: CatalogItemDto[][]): CatalogItemDto[][] =>
    sets.reduce<CatalogItemDto[][]>(
        (results, ids) =>
            results
                .map((result) => ids.map((id) => [...result, id]))
                .reduce((nested, result) => [...nested, ...result]),
        [[]]
    )

/**
 * Builds a list of all possible path variants from pathDto
 * @param pathDto
 * @returns
 */
export const buildPathVariants = (pathDto: PathDto): PathVariant[] => {
    if (!pathDto.foundCatalogItems) {
        return []
    }

    return (
        pathDto.foundCatalogItems.length === 1
            ? pathDto.foundCatalogItems
            : cartesianProduct(pathDto.foundCatalogItems)
    ).map((variant, _) =>
        variant.map(
            (catalogItem, idx) =>
                new MapPoint(
                    idx,
                    !!catalogItem.latitude && !!catalogItem.longitude,
                    catalogItem
                )
        )
    )
}

export default buildPathVariants