/**
 * Region Filter Service
 * Manages Asia-Pacific region filtering (Seoul, Tokyo, Osaka, Singapore, Hong Kong)
 */

/**
 * Asia-Pacific region codes by provider
 * Limited to 5 major cities in East/Southeast Asia
 */
export const ASIA_REGIONS: Record<string, string[]> = {
  linode: ['jp-tyo-3', 'jp-osa', 'sg-sin-2'],
  vultr: ['icn', 'nrt', 'itm'],
  aws: ['ap-northeast-1', 'ap-northeast-2', 'ap-northeast-3', 'ap-southeast-1', 'ap-east-1'],
};

/**
 * Region code to display name mapping
 */
export const REGION_DISPLAY_NAMES: Record<string, string> = {
  // Linode
  'jp-tyo-3': 'Tokyo',
  'jp-osa': 'Osaka',
  'sg-sin-2': 'Singapore',
  // Vultr
  'icn': 'Seoul',
  'nrt': 'Tokyo',
  'itm': 'Osaka',
  // AWS
  'ap-northeast-1': 'Tokyo',
  'ap-northeast-2': 'Seoul',
  'ap-northeast-3': 'Osaka',
  'ap-southeast-1': 'Singapore',
  'ap-east-1': 'Hong Kong',
};

/**
 * Check if a region code is in the Asia-Pacific filter list
 *
 * @param provider - Cloud provider name (case-insensitive)
 * @param regionCode - Region code to check (case-insensitive)
 * @returns true if region is in Asia-Pacific filter list
 */
export function isAsiaRegion(provider: string, regionCode: string): boolean {
  const regions = ASIA_REGIONS[provider.toLowerCase()];
  if (!regions) return false;
  return regions.includes(regionCode.toLowerCase());
}

/**
 * Get all Asia-Pacific region codes for a provider
 *
 * @param provider - Cloud provider name (case-insensitive)
 * @returns Array of region codes, empty if provider not found
 */
export function getAsiaRegionCodes(provider: string): string[] {
  return ASIA_REGIONS[provider.toLowerCase()] || [];
}

/**
 * Get display name for a region code
 *
 * @param regionCode - Region code to look up
 * @returns Display name (e.g., "Tokyo"), or original code if not found
 */
export function getRegionDisplayName(regionCode: string): string {
  return REGION_DISPLAY_NAMES[regionCode] || regionCode;
}