/*
 * Queue - A Queueing system that can be used to handle labs in higher education
 * Copyright (C) 2016-2024  Delft University of Technology
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package nl.tudelft.queue.model.labs;

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.hibernate.validator.constraints.UniqueElements;

import jakarta.persistence.*;
import jakarta.validation.constraints.Max;
import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.NotEmpty;
import jakarta.validation.constraints.NotNull;
import lombok.*;
import lombok.experimental.SuperBuilder;
import nl.tudelft.queue.model.LabRequest;
import nl.tudelft.queue.model.QueueSession;
import nl.tudelft.queue.model.embeddables.AllowedRequest;
import nl.tudelft.queue.model.enums.CommunicationMethod;
import nl.tudelft.queue.model.enums.OnlineMode;
import nl.tudelft.queue.model.enums.RequestType;
import nl.tudelft.queue.model.misc.Presentation;

@Data
@Entity
@SuperBuilder
@NoArgsConstructor
@AllArgsConstructor
@EqualsAndHashCode(callSuper = true)
public abstract class Lab extends QueueSession<LabRequest> {

	/**
	 * The communication method that will be used for the lab. Online meetings disregard this.
	 */
	@NotNull
	@Enumerated(EnumType.STRING)
	private CommunicationMethod communicationMethod;

	/**
	 * The grace period at the end of lab in minutes. This is a time where no further requests can be added to
	 * the request list, but teaching assistants and teachers may still take and answer requests.
	 */
	@Min(0)
	@NotNull
	@Max(180)
	@Builder.Default
	private Integer eolGracePeriod = 15;

	/**
	 * The request types that are allowed within this lab.
	 */
	@NotEmpty
	@UniqueElements
	@Builder.Default
	@ElementCollection
	private Set<AllowedRequest> allowedRequests = new HashSet<>();

	/**
	 * The online options available for the lab. Currently only Jitsi
	 */
	@NotNull
	@UniqueElements
	@Builder.Default
	@ElementCollection
	private Set<OnlineMode> onlineModes = new HashSet<>();

	@NotNull
	@Builder.Default
	private Boolean isBilingual = false;

	@NotNull
	@Builder.Default
	private Boolean enableExperimental = false;

	@OneToOne(mappedBy = "lab", cascade = CascadeType.ALL, orphanRemoval = true)
	@ToString.Exclude
	@EqualsAndHashCode.Exclude
	private Presentation presentation;

	/**
	 * Sets the allowed request types for this lab using a map of assignments to the request types that are
	 * allowed to be created for that assignment.
	 *
	 * @param requestTypes The mapping of assignments to request types from which to read allowed requests.
	 */
	public void setAllowedRequestsFromMap(Map<Long, Set<RequestType>> requestTypes) {
		this.setAllowedRequests(requestTypes.entrySet().stream()
				.flatMap(e -> {
					if (e.getValue() == null) {
						return Stream.empty();
					} else {
						return e.getValue().stream()
								.filter(Objects::nonNull)
								.map(v -> new AllowedRequest(e.getKey(), v));
					}
				})
				.collect(Collectors.toSet()));
	}

	/**
	 * Checks whether the given request is allowed according to the restrictions of this lab.
	 *
	 * @param  request The lab request to check for whether it is allowed to be posted.
	 * @return         Whether the given request should be allowed.
	 */
	protected boolean allowsRequest(LabRequest request) {
		return allowedRequests.contains(AllowedRequest.of(request.getAssignment(), request.getRequestType()));
	}
}
