/**
 * Copyright (c) 2020 RBEI and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v. 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Adhith Gopal - Initial API and Implementation
 *
 */
package org.eclipse.blockchain.model.core;

import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.blockchain.model.ethproject.DeploymentModel;
import org.eclipse.blockchain.model.ethproject.EthereumProject;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceFactoryImpl;

public class EthereumProjectModelHandler {
	private static EthereumProjectModelHandler instance = null;

	private EthereumProjectModelHandler() {
	}

	/**
	 * @return
	 */
	public static EthereumProjectModelHandler getInstance() {
		if (null == instance) {
			instance = new EthereumProjectModelHandler();
		}
		return instance;
	}

	/**
	 * @param projectsToSave
	 * @throws IOException
	 */
	public void saveProjects(final List<EthereumProject> projectsToSave) throws IOException {
		for (EthereumProject ethProj : projectsToSave) {
			saveProject(ethProj);
		}
	}

	/**
	 * @param projectsToSave
	 * @throws IOException
	 */
	public void saveProject(final EthereumProject projectToSave) throws IOException {
		// Assign XMI resource factory IMPL for ethproject
		Resource.Factory.Registry registry = Resource.Factory.Registry.INSTANCE;
		registry.getExtensionToFactoryMap().put("ethproject", new XMIResourceFactoryImpl());

		ResourceSet resourceSet = new ResourceSetImpl();
		Resource resource = resourceSet
				.createResource(URI.createFileURI(projectToSave.getProjectLocation() + File.separator + ".ethproject"));

		resource.getContents().add(projectToSave);

		resource.save(Collections.emptyMap());

	}

	/**
	 * @param ethProjectPath
	 * @return
	 */
	public EthereumProject loadProject(final String ethProjectPath) {
		Resource.Factory.Registry registry = Resource.Factory.Registry.INSTANCE;
		registry.getExtensionToFactoryMap().put("ethproject", new XMIResourceFactoryImpl());

		ResourceSet resourceSet = new ResourceSetImpl();
		Resource resource = resourceSet.getResource(URI.createFileURI(ethProjectPath), true);

		EthereumProject ethProject = (EthereumProject) resource.getContents().get(0);
		Map<String, Map<String, DeploymentModel>> deploymentMap = new HashMap<>();
		reconstructEnvironmentBasedDeploymentMap(deploymentMap, ethProject.getDeploymentmodel());
		ethProject.setEnvironmentBasedDeployedModel(deploymentMap);
		return ethProject;
	}

	private void reconstructEnvironmentBasedDeploymentMap(final Map<String, Map<String, DeploymentModel>> map,
			final List<DeploymentModel> list) {
		for (DeploymentModel dm : list) {
			map.computeIfAbsent(dm.getEnvironment(), v -> new HashMap<>()).put(dm.getScFile(), dm);
		}
	}
}