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* Utility functions for converting between region filter arrays and min/max ranges.
* Used by the DrillDownMapSelector's RangeThermometer component.
* Supports size, importance, and population filter criteria.
*/
import type { RegionSize, ImportanceLevel, PopulationLevel, FilterCriteria } from '../maps'
import { ALL_REGION_SIZES, ALL_IMPORTANCE_LEVELS, ALL_POPULATION_LEVELS } from '../maps'
/**
* Generic type for all filter level types
*/
export type FilterLevel = RegionSize | ImportanceLevel | PopulationLevel
/**
* Get the appropriate "ALL_*_LEVELS" array for a given filter criteria
*/
export function getAllLevelsForCriteria<T extends FilterLevel>(criteria: FilterCriteria): T[] {
switch (criteria) {
case 'size':
return ALL_REGION_SIZES as T[]
case 'importance':
return ALL_IMPORTANCE_LEVELS as T[]
case 'population':
return ALL_POPULATION_LEVELS as T[]
default:
return ALL_REGION_SIZES as T[]
}
}
/**
* Convert an array of sizes to min/max values for the range thermometer.
* Sorts the sizes by their position in ALL_REGION_SIZES and returns the first and last.
*
* @example
* sizesToRange(['medium', 'small', 'large']) // returns ['large', 'small']
* sizesToRange(['medium']) // returns ['medium', 'medium']
*/
export function sizesToRange(sizes: RegionSize[]): [RegionSize, RegionSize] {
const sorted = [...sizes].sort(
(a, b) => ALL_REGION_SIZES.indexOf(a) - ALL_REGION_SIZES.indexOf(b)
)
return [sorted[0], sorted[sorted.length - 1]]
}
/**
* Convert min/max range values back to an array of sizes.
* Returns all sizes between min and max (inclusive) in ALL_REGION_SIZES order.
*
* @example
* rangeToSizes('large', 'small') // returns ['large', 'medium', 'small']
* rangeToSizes('medium', 'medium') // returns ['medium']
*/
export function rangeToSizes(min: RegionSize, max: RegionSize): RegionSize[] {
const minIdx = ALL_REGION_SIZES.indexOf(min)
const maxIdx = ALL_REGION_SIZES.indexOf(max)
return ALL_REGION_SIZES.slice(minIdx, maxIdx + 1)
}
/**
* Calculate which regions are excluded based on the current size filter.
* Returns IDs of regions that exist but are filtered out.
*/
export function calculateExcludedRegions(
allRegionIds: string[],
filteredRegionIds: string[]
): string[] {
const filteredSet = new Set(filteredRegionIds)
return allRegionIds.filter((id) => !filteredSet.has(id))
}
/**
* Calculate preview changes when hovering over a different size range.
* Returns which regions would be added or removed if the user clicked.
*/
export function calculatePreviewChanges(
currentIncludedIds: string[],
previewIncludedIds: string[]
): { addRegions: string[]; removeRegions: string[] } {
const currentSet = new Set(currentIncludedIds)
const previewSet = new Set(previewIncludedIds)
const addRegions: string[] = []
const removeRegions: string[] = []
for (const id of previewSet) {
if (!currentSet.has(id)) {
addRegions.push(id)
}
}
for (const id of currentSet) {
if (!previewSet.has(id)) {
removeRegions.push(id)
}
}
return { addRegions, removeRegions }
}
/**
* Generic: Convert an array of levels to min/max values for the range thermometer.
* Works with any filter criteria (size, importance, population).
*/
export function levelsToRange<T extends FilterLevel>(levels: T[], allLevels: T[]): [T, T] {
const sorted = [...levels].sort((a, b) => allLevels.indexOf(a) - allLevels.indexOf(b))
return [sorted[0], sorted[sorted.length - 1]]
}
/**
* Generic: Convert min/max range values back to an array of levels.
* Works with any filter criteria (size, importance, population).
*/
export function rangeToLevels<T extends FilterLevel>(min: T, max: T, allLevels: T[]): T[] {
const minIdx = allLevels.indexOf(min)
const maxIdx = allLevels.indexOf(max)
return allLevels.slice(minIdx, maxIdx + 1)
}
/**
* Importance-specific: Convert array to range
*/
export function importanceToRange(levels: ImportanceLevel[]): [ImportanceLevel, ImportanceLevel] {
return levelsToRange(levels, ALL_IMPORTANCE_LEVELS)
}
/**
* Importance-specific: Convert range to array
*/
export function rangeToImportance(min: ImportanceLevel, max: ImportanceLevel): ImportanceLevel[] {
return rangeToLevels(min, max, ALL_IMPORTANCE_LEVELS)
}
/**
* Population-specific: Convert array to range
*/
export function populationToRange(levels: PopulationLevel[]): [PopulationLevel, PopulationLevel] {
return levelsToRange(levels, ALL_POPULATION_LEVELS)
}
/**
* Population-specific: Convert range to array
*/
export function rangeToPopulation(min: PopulationLevel, max: PopulationLevel): PopulationLevel[] {
return rangeToLevels(min, max, ALL_POPULATION_LEVELS)
}
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