/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */
package org.openecomp.sdc.be.servlets;

import com.jcabi.aspects.Loggable;
import io.swagger.v3.oas.annotations.Operation;
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.servers.Server;
import io.swagger.v3.oas.annotations.servers.Servers;
import io.swagger.v3.oas.annotations.tags.Tag;
import io.swagger.v3.oas.annotations.tags.Tags;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import org.openecomp.sdc.be.components.impl.aaf.AafPermission;
import org.openecomp.sdc.be.components.impl.aaf.PermissionAllowed;
import org.openecomp.sdc.be.config.Configuration;
import org.openecomp.sdc.common.api.ConfigurationSource;
import org.openecomp.sdc.common.api.Constants;
import org.openecomp.sdc.common.log.wrappers.Logger;
import org.openecomp.sdc.common.servlets.BasicServlet;

/**
 * Root resource (exposed at "/" path)
 */
@Loggable(prepend = true, value = Loggable.DEBUG, trim = false)
@Path("/config")
@Tags({@Tag(name = "SDC Internal APIs")})
@Servers({@Server(url = "/sdc2/rest")})
public class ConfigServlet extends BasicServlet {

    private static final Logger log = Logger.getLogger(ConfigServlet.class);

    @GET
    @Path("/get")
    @Produces(MediaType.APPLICATION_JSON)
    @PermissionAllowed(AafPermission.PermNames.INTERNAL_ALL_VALUE)
    @Operation(description = "Retrieve configuration", method = "GET", responses = {
        @ApiResponse(responseCode = "200", description = "OK", content = @Content(schema = @Schema(implementation = String.class)))})
    public String getConfig(@Context final HttpServletRequest request) {
        String result = null;
        ServletContext context = request.getSession().getServletContext();
        ConfigurationSource configurationSource = (ConfigurationSource) context.getAttribute(Constants.CONFIGURATION_SOURCE_ATTR);
        if (configurationSource != null) {
            Configuration configuration = configurationSource.getAndWatchConfiguration(Configuration.class, null);
            if (configuration == null) {
                log.warn("Configuration of type {} was not found", Configuration.class);
            }
            log.debug("{}", configuration);
            log.info("Info level ENABLED...");
            log.info("The value returned from getConfig is {}", configuration);
            result = gson.toJson(configuration);
        } else {
            log.warn("Source Configuration object was not initialized in the context.");
        }
        return result;
    }
}