/**
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
 * contributors by the @authors tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.quickstarts.fuse.rest;


import javax.annotation.Resource;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Response;


import com.wordnik.swagger.annotations.Api;
import com.wordnik.swagger.annotations.ApiOperation;
import com.wordnik.swagger.annotations.ApiParam;
import com.wordnik.swagger.annotations.ApiResponses;
import com.wordnik.swagger.annotations.ApiResponse;

import org.apache.cxf.jaxrs.ext.MessageContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.Map;

/**
 * This Java class with be hosted in the URI path defined by the @Path annotation. @Path annotations on the methods
 * of this class always refer to a path relative to the path defined at the class level.
 * <p/>
 * For example, with 'http://localhost:8181/cxf' as the default CXF servlet path and '/crm' as the JAX-RS server path,
 * this class will be hosted in 'http://localhost:8181/cxf/crm/customerservice'.  An @Path("/customers") annotation on
 * one of the methods would result in 'http://localhost:8181/cxf/crm/customerservice/customers'.
 */
@Path("/customerservice/")
@Api(value = "/customerservice", description = "Operations about customerservice")

public class CustomerService {

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

    long currentId = 123;
    Map<Long, Customer> customers = new HashMap<Long, Customer>();
    Map<Long, Order> orders = new HashMap<Long, Order>();
    private @Resource MessageContext jaxrsContext;

    public CustomerService() {
        init();
    }

    /**
     * This method is mapped to an HTTP GET of 'http://localhost:8181/cxf/crm/customerservice/customers/{id}'.  The value for
     * {id} will be passed to this message as a parameter, using the @PathParam annotation.
     * <p/>
     * The method returns a Customer object - for creating the HTTP response, this object is marshaled into XML using JAXB.
     * <p/>
     * For example: surfing to 'http://localhost:8181/cxf/crm/customerservice/customers/123' will show you the information of
     * customer 123 in XML format.
     */
    @GET
    @Path("/customers/{id}/")
    @Produces("application/xml")
    @ApiOperation(value = "Find Customer by ID", notes = "More notes about this method", response = Customer.class)
    @ApiResponses(value = {
      @ApiResponse(code = 500, message = "Invalid ID supplied"),
      @ApiResponse(code = 204, message = "Customer not found") 
    })
    public Customer getCustomer(@ApiParam(value = "ID of Customer to fetch", required = true) @PathParam("id") String id) {
        LOG.info("Invoking getCustomer, Customer id is: {}", id);
        long idNumber = Long.parseLong(id);
        Customer c = customers.get(idNumber);
        return c;
    }

    /**
     * Using HTTP PUT, we can can upload the XML representation of a customer object.  This operation will be mapped
     * to the method below and the XML representation will get unmarshaled into a real Customer object using JAXB.
     * <p/>
     * The method itself just updates the customer object in our local data map and afterwards uses the Reponse class to
     * build the appropriate HTTP response: either OK if the update succeeded (translates to HTTP Status 200/OK) or not
     * modified if the method failed to update a customer object (translates to HTTP Status 304/Not Modified).
     * <p/>
     * Note how this method is using the same @Path value as our next method - the HTTP method used will determine which
     * method is being invoked.
     */
    @PUT
    @Path("/customers/")
    @Consumes({"application/xml", "application/json" })
    @ApiOperation(value = "Update an existing Customer")
    @ApiResponses(value = {
                           @ApiResponse(code = 500, message = "Invalid ID supplied"),
                           @ApiResponse(code = 204, message = "Customer not found") 
                         })

    public Response updateCustomer(@ApiParam(value = "Customer object that needs to be updated", required = true) Customer customer) {
        LOG.info("Invoking updateCustomer, Customer name is: {}", customer.getName());
        Customer c = customers.get(customer.getId());
        Response r;
        if (c != null) {
            customers.put(customer.getId(), customer);
            r = Response.ok().build();
        } else {
            r = Response.notModified().build();
        }

        return r;
    }

    /**
     * Using HTTP POST, we can add a new customer to the system by uploading the XML representation for the customer.
     * This operation will be mapped to the method below and the XML representation will get unmarshaled into a real
     * Customer object.
     * <p/>
     * After the method has added the customer to the local data map, it will use the Response class to build the HTTP reponse,
     * sending back the inserted customer object together with a HTTP Status 200/OK.  This allows us to send back the
     * new id for the customer object to the client application along with any other data that might have been updated in
     * the process.
     * <p/>
     * Note how this method is using the same @Path value as our previous method - the HTTP method used will determine which
     * method is being invoked.
     */
    @POST
    @Path("/customers/")
    @Consumes({"application/xml", "application/json" })
    @ApiOperation(value = "Add a new Customer")
    @ApiResponses(value = { @ApiResponse(code = 500, message = "Invalid ID supplied"), })
    public Response addCustomer(@ApiParam(value = "Customer object that needs to be updated", required = true)
                                Customer customer) {
        LOG.info("Invoking addCustomer, Customer name is: {}", customer.getName());
        customer.setId(++currentId);

        customers.put(customer.getId(), customer);
        if (jaxrsContext.getHttpHeaders().getMediaType().getSubtype().equals("json")) {
            return Response.ok().type("application/json").entity(customer).build();
        } else {
            return Response.ok().type("application/xml").entity(customer).build();
        }
    }

    /**
     * This method is mapped to an HTTP DELETE of 'http://localhost:8181/cxf/crm/customerservice/customers/{id}'.  The value for
     * {id} will be passed to this message as a parameter, using the @PathParam annotation.
     * <p/>
     * The method uses the Response class to create the HTTP response: either HTTP Status 200/OK if the customer object was
     * successfully removed from the local data map or a HTTP Status 304/Not Modified if it failed to remove the object.
     */
    @DELETE
    @Path("/customers/{id}/")
    @ApiOperation(value = "Delete Customer")
    @ApiResponses(value = {
                           @ApiResponse(code = 500, message = "Invalid ID supplied"),
                           @ApiResponse(code = 204, message = "Customer not found") 
                         })
    public Response deleteCustomer(@ApiParam(value = "ID of Customer to delete", required = true) @PathParam("id") String id) {
        LOG.info("Invoking deleteCustomer, Customer id is: {}", id);
        long idNumber = Long.parseLong(id);
        Customer c = customers.get(idNumber);

        Response r;
        if (c != null) {
            r = Response.ok().build();
            customers.remove(idNumber);
        } else {
            r = Response.notModified().build();
        }

        return r;
    }

    /**
     * This method is mapped to an HTTP GET of 'http://localhost:8181/cxf/crm/customerservice/orders/{id}'.  The value for
     * {id} will be passed to this message as a parameter, using the @PathParam annotation.
     * <p/>
     * The method returns an Order object - the class for that object includes a few more JAX-RS annotations, allowing it to
     * display one of these two outputs, depending on the actual URI path being used:
     * - display the order information itself in XML format
     * - display details about a product in the order in XML format in a path relative to the URI defined here
     */
    @Path("/orders/{orderId}/")
    public Order getOrder(@PathParam("orderId") String orderId) {
        LOG.info("Invoking getOrder, Order id is: {}", orderId);
        long idNumber = Long.parseLong(orderId);
        Order c = orders.get(idNumber);
        return c;
    }

    /**
     * The init method is used by the constructor to insert a Customer and Order object into the local data map
     * for testing purposes.
     */
    final void init() {
        Customer c = new Customer();
        c.setName("John");
        c.setId(123);
        customers.put(c.getId(), c);

        Order o = new Order();
        o.setDescription("order 223");
        o.setId(223);
        orders.put(o.getId(), o);
    }

}
