import { Result, ok, err } from '../../../../../shared/core/Result';
import { UseCase } from '../../../../../shared/core/UseCase';
import { UseCaseError } from '../../../../../shared/core/UseCaseError';
import { AppError } from '../../../../../shared/core/AppError';
import { ICardRepository } from '../../../domain/ICardRepository';
import { CardId } from '../../../domain/value-objects/CardId';
import { CollectionId } from '../../../domain/value-objects/CollectionId';
import { CuratorId } from '../../../domain/value-objects/CuratorId';
import { CardLibraryService } from '../../../domain/services/CardLibraryService';
import { CardCollectionService } from '../../../domain/services/CardCollectionService';

export interface AddCardToLibraryDTO {
  cardId: string;
  curatorId: string;
  collectionIds?: string[];
}

export interface AddCardToLibraryResponseDTO {
  cardId: string;
}

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

export class AddCardToLibraryUseCase
  implements
    UseCase<
      AddCardToLibraryDTO,
      Result<
        AddCardToLibraryResponseDTO,
        ValidationError | AppError.UnexpectedError
      >
    >
{
  constructor(
    private cardRepository: ICardRepository,
    private cardLibraryService: CardLibraryService,
    private cardCollectionService: CardCollectionService,
  ) {}

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

      // Validate and create CardId
      const cardIdResult = CardId.createFromString(request.cardId);
      if (cardIdResult.isErr()) {
        return err(
          new ValidationError(`Invalid card ID: ${cardIdResult.error.message}`),
        );
      }
      const cardId = cardIdResult.value;

      // Find the card
      const cardResult = await this.cardRepository.findById(cardId);
      if (cardResult.isErr()) {
        return err(AppError.UnexpectedError.create(cardResult.error));
      }

      const card = cardResult.value;
      if (!card) {
        return err(new ValidationError(`Card not found: ${request.cardId}`));
      }

      // Add card to library using domain service
      const addToLibraryResult = await this.cardLibraryService.addCardToLibrary(
        card,
        curatorId,
      );
      if (addToLibraryResult.isErr()) {
        if (addToLibraryResult.error instanceof AppError.UnexpectedError) {
          return err(addToLibraryResult.error);
        }
        return err(new ValidationError(addToLibraryResult.error.message));
      }

      // Handle collection additions if specified
      if (request.collectionIds && request.collectionIds.length > 0) {
        // Validate and create CollectionIds
        const collectionIds: CollectionId[] = [];
        for (const collectionIdStr of request.collectionIds) {
          const collectionIdResult =
            CollectionId.createFromString(collectionIdStr);
          if (collectionIdResult.isErr()) {
            return err(
              new ValidationError(
                `Invalid collection ID: ${collectionIdResult.error.message}`,
              ),
            );
          }
          collectionIds.push(collectionIdResult.value);
        }

        // Add card to collections using domain service
        const addToCollectionsResult =
          await this.cardCollectionService.addCardToCollections(
            card,
            collectionIds,
            curatorId,
          );
        if (addToCollectionsResult.isErr()) {
          if (
            addToCollectionsResult.error instanceof AppError.UnexpectedError
          ) {
            return err(addToCollectionsResult.error);
          }
          return err(new ValidationError(addToCollectionsResult.error.message));
        }
      }

      return ok({
        cardId: card.cardId.getStringValue(),
      });
    } catch (error) {
      return err(AppError.UnexpectedError.create(error));
    }
  }
}