package com.plannaplan.services;

import java.util.List;
import java.util.Optional;

import com.plannaplan.entities.Assignment;
import com.plannaplan.entities.Exchange;
import com.plannaplan.entities.Groups;
import com.plannaplan.repositories.ExchangeRepository;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class ExchangeService {

	@Autowired
	private ExchangeRepository repo;

	/**
	 * @param exchange Instance to save in database
	 * @return Exchange Instance contains database id
	 */
	public Exchange save(Exchange exchange) {
		return this.repo.save(exchange);
	}

	/**
	 * @param id Id of exchange in database
	 * @return Optional Exchange if found
	 */
	public Optional<Exchange> getById(Long id) {
		return this.repo.findById(id);
	}

	/**
	 * @param id Id of user
	 * @return List of exchanges that belong to user
	 */
	public List<Exchange> getByUserId(Long id) {
		return this.repo.getByUserId(id);
	}

	/**
	 * @param entity Exchange entity which we would like to delete
	 */
	public void deleteExchange(Exchange entity) {
		this.repo.delete(entity);
	}

	/**
	 * @param assignment Assignment to trade for
	 * @param group      Desired group
	 * @return Optional with Exchange if exist
	 */
	public Optional<Exchange> checkForExchange(Assignment assignment, Groups group) {
		return this.repo.checkForExchange(assignment, group);
	}

	public void performExchange() {

	}
}