import { EntityTarget, FindManyOptions, QueryRunner, Repository } from "typeorm";

export abstract class BaseDataService<Entity> {
        
    constructor(private repository: Repository<Entity>) {}

    getRepository(): Repository<Entity> {
        return this.repository;
    }

    async create(
        queryRunner: QueryRunner,
        entityTarget: EntityTarget<Entity>,
        entity: Entity,
    ): Promise<Entity> {
        const newEntity = queryRunner.manager.create(entityTarget, entity);
        return await queryRunner.manager.save(newEntity);
    }
    
    async update(
        queryRunner: QueryRunner,
        entityTarget: EntityTarget<Entity>,
        filterUpdate: any,
        entity: Entity,
    ): Promise<Entity> {
        const newEntity = await queryRunner.manager.findOne(entityTarget, {
            where: filterUpdate,
        });

        if (!newEntity) throw new Error('Data not found!');
        Object.assign(newEntity, entity);
        return await queryRunner.manager.save(newEntity);
    }

    async deleteById(
        queryRunner: QueryRunner,
        entityTarget: EntityTarget<Entity>,
        id: string,
    ): Promise<void> {
        await queryRunner.manager.delete(entityTarget, { id });
    }

    async deleteByOptions(
        queryRunner: QueryRunner,
        entityTarget: EntityTarget<Entity>,
        findManyOptions: FindManyOptions<Entity>,
    ): Promise<void> {
        await queryRunner.manager.delete(entityTarget, findManyOptions);
    }

    async getOneByOptions(findOneOptions): Promise<Entity> {
        return await this.repository.findOne(findOneOptions);
    }
}