import type { PdsProviderInfo } from './types';

export interface PdsProvider {
  name: string;
  profileUrl: string;
  host?: string;
}

const BSKY_PROFILE_BASE = 'https://bsky.app/profile/';

const PDS_PROVIDERS: { suffix: string; name: string }[] = [
  { suffix: '.bsky.social', name: 'bluesky' },
  { suffix: '.blacksky.app', name: 'blacksky' },
  { suffix: '.eurosky.social', name: 'eurosky' },
  { suffix: '.northsky.social', name: 'northsky' },
];

const KNOWN_PROVIDER_NAMES = new Set(PDS_PROVIDERS.map((p) => p.name));

const ICON_ONLY_PROVIDERS = new Set(['selfhosted-social', 'selfhosted']);

export function pdsProviderFromApi(
  apiProvider: PdsProviderInfo | null | undefined,
  handle: string,
): PdsProvider | null {
  if (!apiProvider) return null;
  if (ICON_ONLY_PROVIDERS.has(apiProvider.name)) {
    return { name: apiProvider.name, profileUrl: '', host: apiProvider.host };
  }
  if (!KNOWN_PROVIDER_NAMES.has(apiProvider.name)) return null;
  return {
    name: apiProvider.name,
    profileUrl: `${BSKY_PROFILE_BASE}${handle}`,
    host: apiProvider.host,
  };
}

export function getHandleStem(handle: string): string {
  const lower = handle.toLowerCase();
  for (const provider of PDS_PROVIDERS) {
    if (lower.endsWith(provider.suffix) && lower.length > provider.suffix.length) {
      return handle.slice(0, -provider.suffix.length);
    }
  }
  return handle;
}

export function getDisplayLabel(displayName: string | undefined, handle: string): string {
  if (displayName) return displayName;
  return getHandleStem(handle);
}

const PDS_DISPLAY_NAMES: Record<string, string> = {
  bluesky: 'Bluesky',
  blacksky: 'BlackSky',
  eurosky: 'EuroSky',
  northsky: 'NorthSky',
  'selfhosted-social': 'Self-hosted',
  selfhosted: 'Self-hosted',
};

export function getPdsDisplayName(providerName: string): string {
  return PDS_DISPLAY_NAMES[providerName] ?? providerName;
}

export function detectPdsProvider(handle: string): PdsProvider | null {
  const lower = handle.toLowerCase();
  for (const provider of PDS_PROVIDERS) {
    if (lower.endsWith(provider.suffix)) {
      return {
        name: provider.name,
        profileUrl: `${BSKY_PROFILE_BASE}${handle}`,
      };
    }
  }
  return null;
}