import { PagesConfigurationWithTransformedDynamicForms } from '@allianz/taly-sdk';
import { getAllBuildingBlocksInPage } from '@allianz/taly-sdk';
import { posix } from 'path';

export interface BuildingBlockMetaData {
  aclTag: string;
  selector: string;
  library: string;
}

interface UsedBuildingBlocksAndLibraries {
  usedBuildingBlocks: BuildingBlockMetaData[];
  usedLibraryNames: Set<string>;
}

/**
 * collects building block metadata and the used libraries from a pages.json configuration.
 *
 * @param pagesJson pages.json configuration to extract building blocks and libraries from
 */
export function collectUsedBuildingBlocksAndLibraries(
  pagesJson: PagesConfigurationWithTransformedDynamicForms
): UsedBuildingBlocksAndLibraries {
  const usedLibraryNames = new Set<string>();
  const usedBuildingBlocks: BuildingBlockMetaData[] = [];

  pagesJson.pages.forEach((page) => {
    const allBlocks = getAllBuildingBlocksInPage(page);
    allBlocks?.forEach((block) => {
      usedBuildingBlocks.push({
        // we use path.posix here to join the acl resources because it conveniently
        // joins two (or more) strings with a forward slash (/) on all platforms as
        // well as takes care of avoiding any duplicate separators.
        // The aclResourcePath is not a file path but the path tools are very well
        // suited for working with acl paths.
        aclTag: posix.join(page.id, block.aclTag ?? block.id),
        selector: block.selector,
        library: block.package
      });

      // keep track of used libraries to avoid another loop over all pages and blocks
      usedLibraryNames.add(block.package);
    });
  });

  pagesJson.frame?.header?.actions?.forEach((headerAction) => {
    usedBuildingBlocks.push({
      aclTag: posix.join('header-actions', headerAction.aclTag ?? headerAction.id),
      selector: headerAction.selector,
      library: headerAction.package
    });

    usedLibraryNames.add(headerAction.package);
  });

  return { usedBuildingBlocks, usedLibraryNames };
}