import { ValidationRule } from '@allianz/taly-core';
import {
  BannerBlockConfiguration,
  BuildingBlockConfiguration,
  HeaderAction,
  OverarchingDetailsBlockConfiguration,
  PageConfigurationWithTransformedDynamicForms
} from '@allianz/taly-core/schemas';
import { PageInJourneyExampleData } from '@allianz/taly-core/showroom';

export interface PageConfigOverrides {
  [buildingBlockId: string]: {
    validators?: ValidationRule[];
    resources?: { [key: string]: unknown };
  };
}

export interface DataForPage {
  [buildingBlockId: string]: BuildingBlockConfiguration;
}

/**
 * Utility function to be used in a generated page to extract the meta data matching the given page id.
 * @param {PartialPageConfig} pagesConfig the pages configuration
 * @param {string} id the page id to get the data for
 * @param {PageConfigOverrides} pageConfigOverrides additional page-specific data that overrides the page config
 * @returns {DataForPage} Building Block data for a specific page, or empty object if no data could be found.
 */
export function getDataForPage(
  pagesConfig: PageConfigurationWithTransformedDynamicForms[],
  id: string,
  pageConfigOverrides: PageConfigOverrides = {},
  showroomDataForPage?: PageInJourneyExampleData
): DataForPage {
  const page = pagesConfig.find((item) => item.id === id);
  if (!page) {
    console.warn(`Could not find data for page '${id}'`);
    return {};
  }

  const blockData = getAllBlocks(page);

  if (!blockData || blockData.length === 0) {
    console.warn(
      `Page '${id}' seems to be empty. Please add Building Blocks to this page or remove it.`
    );
    return {};
  }

  const blockOverrides = blockData.map((block) => {
    const blockOverrides = pageConfigOverrides[block.id] ?? {};
    return { ...block, ...blockOverrides };
  }) as BuildingBlockConfiguration[];
  const blockMap = getBlockMap(blockOverrides, showroomDataForPage);
  return blockMap;
}

export function getBlockMap(
  blocks: (
    | BuildingBlockConfiguration
    | HeaderAction
    | OverarchingDetailsBlockConfiguration
    | BannerBlockConfiguration
  )[],
  showroomData?: PageInJourneyExampleData
) {
  const blockMap = blocks
    .map((block) => {
      const showroomResources = showroomData?.[block.id]?.resources;
      if (!block.resources && showroomResources) {
        return { ...block, resources: showroomResources };
      }
      return block;
    })
    .reduce((collection, item) => {
      return {
        ...collection,
        [item.id]: item
      };
    }, {});

  return blockMap;
}

function getAllBlocks(page: PageConfigurationWithTransformedDynamicForms) {
  const result: (
    | BuildingBlockConfiguration
    | OverarchingDetailsBlockConfiguration
    | BannerBlockConfiguration
  )[] = [];

  result.push(...(page.blocks ?? []));

  if (page.overarchingDetailsBlock) {
    result.push(page.overarchingDetailsBlock);
  }

  if (page.bannerBlock) {
    result.push(page.bannerBlock);
  }

  return result;
}