import {
	ConflictException,
	Injectable,
	Logger,
	NotFoundException,
} from "@nestjs/common";
import { FavoritesRepository } from "./repositories/favorites.repository";

@Injectable()
export class FavoritesService {
	private readonly logger = new Logger(FavoritesService.name);

	constructor(private readonly favoritesRepository: FavoritesRepository) {}

	async addFavorite(userId: string, contentId: string) {
		this.logger.log(`Adding favorite: user ${userId}, content ${contentId}`);

		const content = await this.favoritesRepository.findContentById(contentId);
		if (!content) {
			throw new NotFoundException("Content not found");
		}

		try {
			return await this.favoritesRepository.add(userId, contentId);
		} catch (_error) {
			throw new ConflictException("Content already in favorites");
		}
	}

	async removeFavorite(userId: string, contentId: string) {
		this.logger.log(`Removing favorite: user ${userId}, content ${contentId}`);
		const result = await this.favoritesRepository.remove(userId, contentId);

		if (result.length === 0) {
			throw new NotFoundException("Favorite not found");
		}

		return result[0];
	}

	async getUserFavorites(userId: string, limit: number, offset: number) {
		return await this.favoritesRepository.findByUserId(userId, limit, offset);
	}
}