memegoat/backend/src/favorites/repositories/favorites.repository.ts

import { Injectable } from "@nestjs/common";
import { and, eq } from "drizzle-orm";
import { DatabaseService } from "../../database/database.service";
import { contents, favorites } from "../../database/schemas";

@Injectable()
export class FavoritesRepository {
	constructor(private readonly databaseService: DatabaseService) {}

	async findContentById(contentId: string) {
		const result = await this.databaseService.db
			.select()
			.from(contents)
			.where(eq(contents.id, contentId))
			.limit(1);
		return result[0] || null;
	}

	async add(userId: string, contentId: string) {
		return await this.databaseService.db
			.insert(favorites)
			.values({ userId, contentId })
			.returning();
	}

	async remove(userId: string, contentId: string) {
		return await this.databaseService.db
			.delete(favorites)
			.where(and(eq(favorites.userId, userId), eq(favorites.contentId, contentId)))
			.returning();
	}

	async findByUserId(userId: string, limit: number, offset: number) {
		const data = await this.databaseService.db
			.select({
				content: contents,
			})
			.from(favorites)
			.innerJoin(contents, eq(favorites.contentId, contents.id))
			.where(eq(favorites.userId, userId))
			.limit(limit)
			.offset(offset);

		return data.map((item) => item.content);
	}
}