import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';

import { Repository } from 'typeorm';

import { InjectCacheStorage } from 'src/engine/core-modules/cache-storage/decorators/cache-storage.decorator';
import { CacheStorageService } from 'src/engine/core-modules/cache-storage/services/cache-storage.service';
import { CacheStorageNamespace } from 'src/engine/core-modules/cache-storage/types/cache-storage-namespace.enum';
import { EMPTY_FLAT_ENTITY_MAPS } from 'src/engine/metadata-modules/flat-entity/constant/empty-flat-entity-maps.constant';
import { FlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-maps.type';
import { addFlatEntityToFlatEntityMapsOrThrow } from 'src/engine/metadata-modules/flat-entity/utils/add-flat-entity-to-flat-entity-maps-or-throw.util';
import { FlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/types/flat-object-metadata.type';
import { fromObjectMetadataEntityToFlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/utils/from-object-metadata-entity-to-flat-object-metadata.util';
import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
import { WorkspaceFlatMapCache } from 'src/engine/workspace-flat-map-cache/decorators/workspace-flat-map-cache.decorator';
import { WorkspaceFlatMapCacheService } from 'src/engine/workspace-flat-map-cache/services/workspace-flat-map-cache.service';

@Injectable()
@WorkspaceFlatMapCache('flatObjectMetadataMaps')
export class WorkspaceFlatObjectMetadataMapCacheService extends WorkspaceFlatMapCacheService<
  FlatEntityMaps<FlatObjectMetadata>
> {
  constructor(
    @InjectCacheStorage(CacheStorageNamespace.EngineWorkspace)
    cacheStorageService: CacheStorageService,

    @InjectRepository(ObjectMetadataEntity)
    private readonly objectMetadataRepository: Repository<ObjectMetadataEntity>,
  ) {
    super(cacheStorageService);
  }

  protected async computeFlatMap({
    workspaceId,
  }: {
    workspaceId: string;
  }): Promise<FlatEntityMaps<FlatObjectMetadata>> {
    const objectMetadatas = await this.objectMetadataRepository.find({
      where: {
        workspaceId,
      },
      withDeleted: true,
      select: {
        fields: {
          id: true,
        },
        indexMetadatas: {
          id: true,
        },
        views: {
          id: true,
        },
      },
      relations: ['fields', 'indexMetadatas', 'views'],
    });

    return objectMetadatas.reduce(
      (flatObjectMetadataMaps, objectMetadataEntity) => {
        const flatObjectMetadata =
          fromObjectMetadataEntityToFlatObjectMetadata(objectMetadataEntity);

        return addFlatEntityToFlatEntityMapsOrThrow({
          flatEntity: flatObjectMetadata,
          flatEntityMaps: flatObjectMetadataMaps,
        });
      },
      EMPTY_FLAT_ENTITY_MAPS,
    );
  }
}