/********************************************************************************
 * Copyright (c) 2015-2018 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.businessobjects.boundary;

import static org.eclipse.mdm.businessobjects.boundary.ResourceConstants.REQUESTPARAM_ID;
import static org.eclipse.mdm.businessobjects.boundary.ResourceConstants.REQUESTPARAM_SOURCENAME;
import static org.eclipse.mdm.businessobjects.utils.Decomposer.decompose;

import java.util.Map;

import javax.ejb.EJB;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;

import org.eclipse.mdm.api.base.adapter.Attribute;
import org.eclipse.mdm.api.base.adapter.EntityType;
import org.eclipse.mdm.api.base.model.Environment;
import org.eclipse.mdm.api.dflt.model.Project;
import org.eclipse.mdm.api.dflt.model.ValueList;
import org.eclipse.mdm.businessobjects.entity.I18NResponse;
import org.eclipse.mdm.businessobjects.entity.MDMEntity;
import org.eclipse.mdm.businessobjects.entity.MDMEntityResponse;
import org.eclipse.mdm.businessobjects.entity.SearchAttributeResponse;
import org.eclipse.mdm.businessobjects.service.EntityService;
import org.eclipse.mdm.businessobjects.utils.ServiceUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.tags.Tag;
import io.vavr.collection.List;
import io.vavr.control.Try;
// TODO: Use entityService (and vavr) in all Methods

/**
 * {@link Project} resource
 * 
 * @author Matthias Koller, Peak Solution GmbH
 *
 */
@Tag(name = "Project")
@Path("/environments/{" + REQUESTPARAM_SOURCENAME + "}/projects")
public class ProjectResource {

	private static final Logger LOG = LoggerFactory.getLogger(ProjectResource.class);

	@EJB
	private ProjectService projectService;

	@EJB
	private EntityService entityService;

	/**
	 * delegates the request to the {@link ProjectService}
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @param filter     filter string to filter the {@link Project} result
	 * @return the result of the delegated request as {@link Response}
	 */
	@GET
	@Operation(summary = "Find Projects by filter", description = "Get list of Projects", responses = {
			@ApiResponse(description = "The projects", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "400", description = "Error") })
	@Produces(MediaType.APPLICATION_JSON)
	public Response getProjects(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName,
			@Parameter(description = "Filter expression", required = false) @QueryParam("filter") String filter) {
		return Try.of(() -> projectService.getProjects(sourceName, filter)) //
				.map(List::ofAll) //
				.map(e -> ServiceUtils.buildEntityResponse(e, Status.OK, Project.class))
				.recover(ServiceUtils.ERROR_RESPONSE_SUPPLIER) //
				.getOrElse(ServiceUtils.SERVER_ERROR_RESPONSE);
	}

	/**
	 * delegates the request to the {@link ProjectService}
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @return the result of the delegated request as {@link Response}
	 */
	@GET
	@Operation(summary = "Get the search attributes", description = "Get a list of search attributes", responses = {
			@ApiResponse(description = "The search attributes", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "500", description = "Error") })
	@Produces(MediaType.APPLICATION_JSON)
	@Path("/searchattributes")
	public Response getSearchAttributes(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName) {
		return Try.of(() -> projectService.getSearchAttributes(sourceName))
				.map(attrs -> ServiceUtils.toResponse(new SearchAttributeResponse(attrs), Status.OK))
				.recover(ServiceUtils.ERROR_RESPONSE_SUPPLIER) //
				.getOrElse(ServiceUtils.SERVER_ERROR_RESPONSE);
	}

	/**
	 * delegates the request to the {@link ProjectService}
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @param projectId  id of the {@link Project}
	 * @return the result of the delegated request as {@link Response}
	 */
	@GET
	@Produces(MediaType.APPLICATION_JSON)
	@Path("/{" + REQUESTPARAM_ID + "}")
	@Operation(summary = "Find a Project by ID", description = "Returns Project based on ID", responses = {
			@ApiResponse(description = "The Project", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "400", description = "Invalid ID supplied") })
	public Response findProject(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName,
			@Parameter(description = "ID of the Project", required = true) @PathParam(REQUESTPARAM_ID) String id) {
		return entityService.find(sourceName, Project.class, id)
				.map(e -> ServiceUtils.buildEntityResponse(e, Status.OK)) //
				.recover(ServiceUtils.ERROR_RESPONSE_SUPPLIER) //
				.getOrElse(ServiceUtils.SERVER_ERROR_RESPONSE);
	}

	/**
	 * delegates the request to the {@link ProjectService}
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @return the result of the delegated request as {@link Response}
	 */
	@GET
	@Operation(summary = "Get the Project localizations", description = "Returns Project localizations", responses = {
			@ApiResponse(description = "The Project localizations", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "500", description = "Error") })
	@Produces(MediaType.APPLICATION_JSON)
	@Path("/localizations")
	public Response localize(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName) {

		try {
			Map<Attribute, String> localizedAttributeMap = this.projectService.localizeAttributes(sourceName);
			Map<EntityType, String> localizedEntityTypeMap = this.projectService.localizeType(sourceName);
			return ServiceUtils.toResponse(new I18NResponse(localizedEntityTypeMap, localizedAttributeMap), Status.OK);

		} catch (RuntimeException e) {
			LOG.error("Cannot load localizations!", e);
			throw new WebApplicationException(e.getMessage(), e, Status.INTERNAL_SERVER_ERROR);
		}
	}

	/**
	 * Returns the created {@link Project}.
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @param body       The {@link Project} to create.
	 * @return the created {@link Project} as {@link Response}.
	 */
	@POST
	@Operation(summary = "Create a new Project",  responses = {
			@ApiResponse(description = "The created Project", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "500", description = "Error") })
	@Produces(MediaType.APPLICATION_JSON)
	@Consumes(MediaType.APPLICATION_JSON)
	public Response create(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName,
			MDMEntityResponse body) {

		return entityService
				.create(sourceName, Project.class, entityService.extractArgumentsFromRequestBody(sourceName, body))
				.map(e -> ServiceUtils.buildEntityResponse(e, Status.CREATED))
				.recover(ServiceUtils.ERROR_RESPONSE_SUPPLIER) //
				.getOrElse(ServiceUtils.SERVER_ERROR_RESPONSE);
	}

	/**
	 * Updates the {@link Project} with all parameters set in the given JSON body of
	 * the request.
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @param id         the identifier of the {@link ProjectValue} to update.
	 * @param body       the body of the request containing the attributes to update
	 * @return the updated {@link Project}
	 */
	@POST
	@Operation(summary = "Update an existing Project", description = "Updates the Project with all parameters set in the body of the request.", responses = {
			@ApiResponse(description = "The updated Project", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "400", description = "Invalid ID supplied") })
	@Produces(MediaType.APPLICATION_JSON)
	@Consumes(MediaType.APPLICATION_JSON)
	@Path("/{" + REQUESTPARAM_ID + "}")
	public Response patch(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName,
			@Parameter(description = "ID of the Project", required = true) @PathParam(REQUESTPARAM_ID) String id,
			MDMEntityResponse body) {
		
		return entityService
				.update(sourceName, entityService.find(sourceName, Project.class, id),
						decompose(body::getData).<MDMEntity>getValueAt(0))
				.map(e -> ServiceUtils.buildEntityResponse(e, Status.OK)) //
				.recover(ServiceUtils.ERROR_RESPONSE_SUPPLIER) //
				.getOrElse(ServiceUtils.SERVER_ERROR_RESPONSE);
	}

	/**
	 * Deletes and returns the deleted {@link Project}.
	 * 
	 * @param sourceName name of the source (MDM {@link Environment} name)
	 * @param id         The identifier of the {@link Project} to delete.
	 * @return the deleted {@link ValueList }s as {@link Response}
	 */
	@DELETE
	@Operation(summary = "Delete an existing Project", responses = {
			@ApiResponse(description = "The deleted Project", content = @Content(schema = @Schema(implementation = MDMEntityResponse.class))),
			@ApiResponse(responseCode = "400", description = "Invalid ID supplied") })
	@Produces(MediaType.APPLICATION_JSON)
	@Path("/{" + REQUESTPARAM_ID + "}")
	public Response delete(
			@Parameter(description = "Name of the MDM datasource", required = true) @PathParam(REQUESTPARAM_SOURCENAME) String sourceName,
			@Parameter(description = "ID of the Project", required = true) @PathParam(REQUESTPARAM_ID) String id) {
		return entityService.delete(sourceName, entityService.find(sourceName, Project.class, id))
				.map(e -> ServiceUtils.buildEntityResponse(e, Status.OK)) //
				.recover(ServiceUtils.ERROR_RESPONSE_SUPPLIER) //
				.getOrElse(ServiceUtils.SERVER_ERROR_RESPONSE);
	}
}