/**
 * @file Pollution related constants, aligned with backend enums.
 */

/**
 * Represents the types of pollution, consistent with the `PollutionType` enum in the backend.
 * This ensures that frontend displays and data submissions are aligned with backend expectations.
 */
export const POLLUTION_TYPES = ['PM25', 'O3', 'NO2', 'SO2', 'OTHER'] as const;

/**
 * Type definition for a single pollution type.
 * Ensures type safety when working with pollution constants.
 */
export type PollutionType = typeof POLLUTION_TYPES[number];

/**
 * A map to provide human-readable names for pollution types.
 * Useful for displaying in UI components like chart legends or labels.
 */
export const POLLUTION_TYPE_MAP: Record<PollutionType, string> = {
  PM25: 'PM2.5',
  O3: 'O₃',
  NO2: 'NO₂',
  SO2: 'SO₂',
  OTHER: '其他',
};