/**
 * OneMap Themes Service
 * Provides access to Singapore's thematic layers including landmarks, facilities, and points of interest
 */
import { OneMapService } from './onemap.js';
import { CacheService } from './cache.js';
export interface ThemeInfo {
    themeName: string;
    queryName: string;
    icon?: string;
    expiryDate?: string;
    publishedDate?: string;
    category: string;
    themeOwner: string;
}
export interface ThemeFeature {
    name: string;
    description: string;
    hyperlink?: string;
    category: string;
    owner: string;
    coordinates: [number, number];
    properties: Record<string, any>;
    iconName?: string;
    distance?: number;
}
export interface ThemeSearchResult {
    theme: ThemeInfo;
    features: ThemeFeature[];
    totalCount: number;
    searchArea?: {
        center: [number, number];
        radius: number;
    };
}
export declare class ThemesService {
    private oneMapService;
    private cacheService;
    private readonly CACHE_DURATION;
    constructor(oneMapService: OneMapService, cacheService: CacheService);
    /**
     * Get all available themes from OneMap
     */
    getAllThemes(): Promise<ThemeInfo[]>;
    /**
     * Search for landmarks and facilities near a location
     */
    findLandmarksNear(latitude: number, longitude: number, radius?: number, categories?: string[]): Promise<ThemeSearchResult[]>;
    /**
     * Search for specific types of facilities (e.g., schools, hospitals, parks)
     */
    findFacilitiesByType(facilityType: string, latitude?: number, longitude?: number, radius?: number): Promise<ThemeSearchResult[]>;
    /**
     * Get landmarks near a postal code
     */
    findLandmarksNearPostalCode(postalCode: string, radius?: number, categories?: string[]): Promise<ThemeSearchResult[]>;
    /**
     * Search a specific theme within an area
     */
    private searchThemeInArea;
    /**
     * Search a specific theme
     */
    private searchTheme;
    /**
     * Calculate search extents based on center point and radius
     */
    private calculateExtents;
    /**
     * Calculate distance between two points in meters
     */
    private calculateDistance;
    /**
     * Get popular landmark categories
     */
    getPopularCategories(): string[];
    /**
     * Get common facility types
     */
    getCommonFacilityTypes(): string[];
}