import type {PluginGameSourceDraft, XLibraryPlugin} from '@xlibrary/plugin-sdk';

function getExternalId(input: {externalId?: string; url?: string}): string {
  if (input.externalId?.trim()) {
    return input.externalId.trim();
  }

  const url = input.url ? new URL(input.url) : undefined;
  const slug = url?.pathname.split('/').filter(Boolean).at(-1);
  if (!slug) {
    throw new Error('A provider external id or URL is required');
  }
  return decodeURIComponent(slug);
}

function createDraft(input: {externalId?: string; url?: string; name?: string; description?: string}): PluginGameSourceDraft {
  const externalId = getExternalId(input);
  return {
    externalId,
    canonicalUrl: input.url || `https://catalog.example/games/${encodeURIComponent(externalId)}`,
    name: input.name || `Example Game (${externalId})`,
    ...(input.description ? {description: input.description} : {}),
    tags: [],
    screenshotUrls: [],
    isPartial: false,
    missingFields: [],
    metadata: {},
  };
}

const plugin: XLibraryPlugin = {
  async invoke(invocation) {
    if (invocation.method === 'game-sources.search') {
      return {
        candidates: [{
          identity: {
            externalId: 'example-game',
            canonicalUrl: 'https://catalog.example/games/example-game',
          },
          title: 'Example Game',
        }],
      };
    }

    if (invocation.method === 'game-sources.resolve') {
      return createDraft(invocation.payload);
    }

    if (invocation.method === 'game-sources.refresh') {
      return {
        ...createDraft({
          externalId: invocation.payload.externalId,
          url: invocation.payload.url,
          name: invocation.payload.game.name,
          description: 'Refreshed from My Game Catalog.',
        }),
        version: invocation.payload.game.version || '1.0.0',
        changedFields: ['description', 'version'],
      };
    }

    if (invocation.method === 'game-sources.parse-page') {
      return createDraft({
        externalId: invocation.payload.externalId,
        url: invocation.payload.page.url,
        name: invocation.payload.page.title,
        description: invocation.payload.page.text.slice(0, 1_000),
      });
    }

    throw new Error(`Unsupported plugin method: ${invocation.method}`);
  },
};

export default plugin;