/*
 * Copyright 2015 Open Networking Laboratory
 *
 * 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.onosproject.rest.resources;

import org.onosproject.app.ApplicationAdminService;
import org.onosproject.core.Application;
import org.onosproject.core.ApplicationId;
import org.onosproject.rest.AbstractWebResource;

import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.DefaultValue;
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.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.InputStream;
import java.util.Set;

/**
 * REST resource for interacting with the inventory of applications.
 */
@Path("applications")
public class ApplicationsWebResource extends AbstractWebResource {

    @GET
    public Response getApplications() {
        ApplicationAdminService service = get(ApplicationAdminService.class);
        Set<Application> apps = service.getApplications();
        return ok(encodeArray(Application.class, "applications", apps)).build();
    }

    @GET
    @Path("{name}")
    public Response getApplication(@PathParam("name") String name) {
        ApplicationAdminService service = get(ApplicationAdminService.class);
        ApplicationId appId = service.getId(name);
        return response(service, appId);
    }

    @POST
    @Consumes(MediaType.APPLICATION_OCTET_STREAM)
    @Produces(MediaType.APPLICATION_JSON)
    public Response installApplication(@QueryParam("activate")
                                           @DefaultValue("false") boolean activate,
                                       InputStream stream) {
        ApplicationAdminService service = get(ApplicationAdminService.class);
        Application app = service.install(stream);
        if (activate) {
            service.activate(app.id());
        }
        return ok(codec(Application.class).encode(app, this)).build();
    }

    @DELETE
    @Produces(MediaType.APPLICATION_JSON)
    @Path("{name}")
    public Response uninstallApplication(@PathParam("name") String name) {
        ApplicationAdminService service = get(ApplicationAdminService.class);
        ApplicationId appId = service.getId(name);
        service.uninstall(appId);
        return Response.ok().build();
    }

    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Path("{name}/active")
    public Response activateApplication(@PathParam("name") String name) {
        ApplicationAdminService service = get(ApplicationAdminService.class);
        ApplicationId appId = service.getId(name);
        service.activate(appId);
        return response(service, appId);
    }

    @DELETE
    @Produces(MediaType.APPLICATION_JSON)
    @Path("{name}/active")
    public Response deactivateApplication(@PathParam("name") String name) {
        ApplicationAdminService service = get(ApplicationAdminService.class);
        ApplicationId appId = service.getId(name);
        service.deactivate(appId);
        return response(service, appId);
    }

    private Response response(ApplicationAdminService service, ApplicationId appId) {
        Application app = service.getApplication(appId);
        return ok(codec(Application.class).encode(app, this)).build();
    }

}