import { Result, ok, err } from '../../../../../shared/core/Result';
import { BaseUseCase } from '../../../../../shared/core/UseCase';
import { UseCaseError } from '../../../../../shared/core/UseCaseError';
import { AppError } from '../../../../../shared/core/AppError';
import { IEventPublisher } from '../../../../../shared/application/events/IEventPublisher';
import { ICardRepository } from '../../../domain/ICardRepository';
import { ICollectionQueryRepository } from '../../../domain/ICollectionQueryRepository';
import { ICollectionRepository } from '../../../domain/ICollectionRepository';
import { IProfileService } from '../../../domain/services/IProfileService';
import { CuratorId } from '../../../domain/value-objects/CuratorId';
import { URL } from '../../../domain/value-objects/URL';
import { CollectionId } from '../../../domain/value-objects/CollectionId';

export interface GetUrlStatusForMyLibraryQuery {
  url: string;
  curatorId: string;
}

export interface CollectionInfo {
  id: string;
  uri?: string;
  name: string;
  description?: string;
  author: {
    id: string;
    name: string;
    handle: string;
    avatarUrl?: string;
    description?: string;
  };
  cardCount: number;
  createdAt: string;
  updatedAt: string;
}

export interface GetUrlStatusForMyLibraryResult {
  cardId?: string;
  collections?: CollectionInfo[];
}

export class ValidationError extends UseCaseError {
  constructor(message: string) {
    super(message);
  }
}

export class GetUrlStatusForMyLibraryUseCase extends BaseUseCase<
  GetUrlStatusForMyLibraryQuery,
  Result<
    GetUrlStatusForMyLibraryResult,
    ValidationError | AppError.UnexpectedError
  >
> {
  constructor(
    private cardRepository: ICardRepository,
    private collectionQueryRepository: ICollectionQueryRepository,
    private collectionRepo: ICollectionRepository,
    private profileService: IProfileService,
    eventPublisher: IEventPublisher,
  ) {
    super(eventPublisher);
  }

  async execute(
    query: GetUrlStatusForMyLibraryQuery,
  ): Promise<
    Result<
      GetUrlStatusForMyLibraryResult,
      ValidationError | AppError.UnexpectedError
    >
  > {
    try {
      // Validate and create CuratorId
      const curatorIdResult = CuratorId.create(query.curatorId);
      if (curatorIdResult.isErr()) {
        return err(
          new ValidationError(
            `Invalid curator ID: ${curatorIdResult.error.message}`,
          ),
        );
      }
      const curatorId = curatorIdResult.value;

      // Validate URL
      const urlResult = URL.create(query.url);
      if (urlResult.isErr()) {
        return err(
          new ValidationError(`Invalid URL: ${urlResult.error.message}`),
        );
      }
      const url = urlResult.value;

      // Check if user has a URL card with this URL
      const existingCardResult =
        await this.cardRepository.findUsersUrlCardByUrl(url, curatorId);
      if (existingCardResult.isErr()) {
        return err(AppError.UnexpectedError.create(existingCardResult.error));
      }

      const card = existingCardResult.value;
      const result: GetUrlStatusForMyLibraryResult = {};

      if (card) {
        result.cardId = card.cardId.getStringValue();

        // Get collections containing this card for the user
        try {
          const collections =
            await this.collectionQueryRepository.getCollectionsContainingCardForUser(
              card.cardId.getStringValue(),
              curatorId.value,
            );

          // Enrich collections with full data
          result.collections = await Promise.all(
            collections.map(async (collection) => {
              // Fetch full collection to get dates and cardCount
              const collectionIdResult = CollectionId.createFromString(
                collection.id,
              );
              if (collectionIdResult.isErr()) {
                throw new Error(
                  `Invalid collection ID: ${collection.id}`,
                );
              }
              const collectionResult = await this.collectionRepo.findById(
                collectionIdResult.value,
              );
              if (collectionResult.isErr() || !collectionResult.value) {
                throw new Error(
                  `Collection not found: ${collection.id}`,
                );
              }
              const fullCollection = collectionResult.value;

              // Fetch author profile
              const authorProfileResult = await this.profileService.getProfile(
                fullCollection.authorId.value,
              );
              if (authorProfileResult.isErr()) {
                throw new Error(
                  `Failed to fetch author profile: ${authorProfileResult.error.message}`,
                );
              }
              const authorProfile = authorProfileResult.value;

              return {
                id: collection.id,
                uri: collection.uri,
                name: collection.name,
                description: collection.description,
                author: {
                  id: authorProfile.id,
                  name: authorProfile.name,
                  handle: authorProfile.handle,
                  avatarUrl: authorProfile.avatarUrl,
                  description: authorProfile.bio,
                },
                cardCount: fullCollection.cardCount,
                createdAt: fullCollection.createdAt.toISOString(),
                updatedAt: fullCollection.updatedAt.toISOString(),
              };
            }),
          );
        } catch (error) {
          return err(AppError.UnexpectedError.create(error));
        }
      }

      return ok(result);
    } catch (error) {
      return err(AppError.UnexpectedError.create(error));
    }
  }
}