/********************************************************************************
 * Copyright (c) 2015-2019 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 ********************************************************************************/

package org.eclipse.mdm.filerelease.boundary;

import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import javax.ejb.EJB;
import javax.ejb.Stateless;
import javax.inject.Inject;

import org.eclipse.mdm.api.base.model.TestStep;
import org.eclipse.mdm.api.base.model.User;
import org.eclipse.mdm.connector.boundary.ConnectorService;
import org.eclipse.mdm.filerelease.control.FileConvertJobManager;
import org.eclipse.mdm.filerelease.control.FileReleaseException;
import org.eclipse.mdm.filerelease.control.FileReleaseManager;
import org.eclipse.mdm.filerelease.entity.FileRelease;
import org.eclipse.mdm.filerelease.utils.FileReleasePermissionUtils;
import org.eclipse.mdm.filerelease.utils.FileReleaseUtils;
import org.eclipse.mdm.property.GlobalProperty;

/**
 * FileReleaseService Bean implementation with available {@link FileRelease}
 * operations
 * 
 * @author Sebastian Dirsch, Gigatronik Ingolstadt GmbH
 *
 */
@Stateless
public class FileReleaseService {

	@Inject
	private ConnectorService connectorService;
	@EJB
	private FileReleaseManager manager;
	@EJB
	private FileConvertJobManager converter;

	@Inject
	@GlobalProperty("filerelease.converter.target.root.directory")
	private String targetDirectoryPath = "";

	/**
	 * Returns the the {@link FileRelease} with the given identifier
	 * 
	 * @param identifier The identifier of the {@link FileRelease}
	 * @return The {@link FileRelease}
	 */
	public FileRelease getRelease(String identifier) {
		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);
		return this.manager.getRelease(user.getName(), identifier);
	}

	/**
	 * Returns all {@link FileRelease}s with the given state.
	 * 
	 * @param state The state of the {@link FileRelease}s to return (null means all
	 *              releases in every state will be returned)
	 * @return The {@link FileRelease}s in given state or all {@link FileRelease}s
	 */
	public List<FileRelease> getReleases(String state) {
		Set<FileRelease> fileReleases = new HashSet<>();
		fileReleases.addAll(getIncommingReleases(state));
		fileReleases.addAll(getOutgoingReleases(state));
		return new ArrayList<>(fileReleases);
	}

	/**
	 * Returns all incoming {@link FileRelease}s with the given state.
	 * 
	 * @param state The state of the incoming {@link FileRelease}s to return (null
	 *              means all incoming releases in every state will be returned)
	 * @return The incoming {@link FileRelease} in given state or all incoming
	 *         {@link FileRelease}s
	 */
	public List<FileRelease> getIncommingReleases(String state) {

		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);
		if (state == null || state.trim().length() <= 0) {
			List<FileRelease> list = this.manager.getReleases(user.getName(),
					FileReleaseManager.FILE_RELEASE_DIRECTION_INCOMMING);
			return FileReleaseUtils.filterByConnectedSources(list, this.connectorService);
		}
		List<FileRelease> list = this.manager.getReleases(user.getName(),
				FileReleaseManager.FILE_RELEASE_DIRECTION_INCOMMING, state);
		return FileReleaseUtils.filterByConnectedSources(list, this.connectorService);
	}

	/**
	 * Returns all outgoing {@link FileRelease}s with the given state.
	 * 
	 * @param state The state of the outgoing {@link FileRelease}s to return (null
	 *              means all outgoing releases in every state will be returned)
	 * @return The outgoing {@link FileRelease}s in given state or all outgoing
	 *         {@link FileRelease}s
	 */
	public List<FileRelease> getOutgoingReleases(String state) {

		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);
		if (state == null || state.trim().length() <= 0) {
			List<FileRelease> list = this.manager.getReleases(user.getName(),
					FileReleaseManager.FILE_RELEASE_DIRECTION_OUTGOING);
			return FileReleaseUtils.filterByConnectedSources(list, this.connectorService);
		}
		List<FileRelease> list = this.manager.getReleases(user.getName(),
				FileReleaseManager.FILE_RELEASE_DIRECTION_OUTGOING, state);
		return FileReleaseUtils.filterByConnectedSources(list, this.connectorService);
	}

	/**
	 * Creates a new {@link FileRelease}. Approves the {@link FileRelease} directly
	 * if the sender is equals the receiver of the {@link FileRelease}.
	 * 
	 * @param newFileRelease The given {@link FileRelease} that holds the
	 *                       information to create a new {@link FileRelease}
	 */
	public FileRelease create(FileRelease newFileRelease) {
		checkFileReleaseRequest(newFileRelease);
		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);

		List<FileRelease> list = this.manager.getReleases(user.getName(),
				FileReleaseManager.FILE_RELEASE_DIRECTION_OUTGOING);
		FileReleasePermissionUtils.canCreate(newFileRelease, user.getName(), list);

		TestStep testStep = FileReleaseUtils.loadTestStep(connectorService, newFileRelease.sourceName,
				newFileRelease.id);
		User receiver = FileReleaseUtils.getResponsiblePerson(this.connectorService, testStep);

		newFileRelease.identifier = UUID.randomUUID().toString();
		newFileRelease.name = testStep.getName();
		newFileRelease.state = FileReleaseManager.FILE_RELEASE_STATE_ORDERED;
		newFileRelease.sender = user.getName();
		newFileRelease.receiver = receiver.getName();

		this.manager.addFileRelease(newFileRelease);

		if (newFileRelease.sender.equalsIgnoreCase(newFileRelease.receiver)) {
			FileRelease fileRelease2Approve = new FileRelease();
			fileRelease2Approve.identifier = newFileRelease.identifier;
			fileRelease2Approve.state = FileReleaseManager.FILE_RELEASE_STATE_APPROVED;
			approve(fileRelease2Approve);
		}

		return newFileRelease;
	}

	/**
	 * Deletes the {@link FileRelease} with the given identifier.
	 * 
	 * @param identifier The identifier of the {@link FileRelease} to delete.
	 */
	public void delete(String identifier) {

		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);
		FileRelease fileRelease = this.manager.getRelease(user.getName(), identifier);

		FileReleasePermissionUtils.canDelete(fileRelease, user.getName());
		File targetDirectory = FileReleaseUtils.locateTargetDirectory(this.targetDirectoryPath);
		File targetFile = new File(targetDirectory, fileRelease.fileLink);
		if (this.manager.canDeleteFileLink(fileRelease.identifier, fileRelease.fileLink)) {
			FileReleaseUtils.deleteFileLink(targetFile);
		}

		this.manager.removeFileRelease(fileRelease);
	}

	/**
	 * Approves and Releases the {@link FileRelease}
	 * 
	 * @param updatedFileRelease The {@link FileRelease} to approve and release
	 */
	public FileRelease approve(FileRelease updatedFileRelease) {

		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);
		FileRelease fileRelease = this.manager.getRelease(user.getName(), updatedFileRelease.identifier);

		FileReleasePermissionUtils.canApprove(fileRelease, user.getName());
		fileRelease.state = updatedFileRelease.state;

		FileReleasePermissionUtils.canRelease(fileRelease, user.getName());
		this.converter.release(fileRelease, FileReleaseUtils.locateTargetDirectory(this.targetDirectoryPath));
		return fileRelease;
	}

	/**
	 * Rejects the {@link FileRelease} with the given identifier. Sets the given
	 * message as reject message.
	 * 
	 * @param updatedFileRelease {@link FileRelease} to reject
	 */
	public FileRelease reject(FileRelease updatedFileRelease) {

		User user = FileReleaseUtils.getLoggedOnUser(this.connectorService);
		FileRelease fileRelease = this.manager.getRelease(user.getName(), updatedFileRelease.identifier);

		FileReleasePermissionUtils.canReject(fileRelease, user.getName());
		fileRelease.state = updatedFileRelease.state;
		fileRelease.rejectMessage = updatedFileRelease.rejectMessage;
		return fileRelease;
	}

	private void checkFileReleaseRequest(FileRelease newFileRelease) {
		if (newFileRelease.sourceName == null || newFileRelease.sourceName.trim().length() < 1) {
			throw new FileReleaseException("source name for new FileRelease is missing!");
		}

		if (newFileRelease.typeName == null || newFileRelease.typeName.trim().length() < 1) {
			throw new FileReleaseException("type name for new FileRelease is missing!");
		}

		if (newFileRelease.id == null || newFileRelease.id.isEmpty()) {
			throw new FileReleaseException("is is not valid for new FileRelease");
		}

		if (newFileRelease.validity <= 0) {
			throw new FileReleaseException("validity [days] is not set for new FileRelease");
		}

		if (newFileRelease.format == null || newFileRelease.format.trim().length() <= 0) {
			throw new FileReleaseException("output format for new FileRelease is missing!");
		}

		if (!FileReleaseUtils.isFormatValid(newFileRelease.format)) {
			throw new FileReleaseException(
					"unsupported file output format '" + newFileRelease.format + "' was defined for new FileRelease");
		}

	}

}