/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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 com.alibaba.csp.sentinel.cluster.server.command.handler;

import java.net.URLDecoder;

import com.alibaba.csp.sentinel.cluster.server.config.ClusterServerConfigManager;
import com.alibaba.csp.sentinel.cluster.server.config.ServerFlowConfig;
import com.alibaba.csp.sentinel.cluster.server.config.ServerTransportConfig;
import com.alibaba.csp.sentinel.command.CommandHandler;
import com.alibaba.csp.sentinel.command.CommandRequest;
import com.alibaba.csp.sentinel.command.CommandResponse;
import com.alibaba.csp.sentinel.command.annotation.CommandMapping;
import com.alibaba.csp.sentinel.log.RecordLog;
import com.alibaba.csp.sentinel.util.StringUtil;
import com.alibaba.fastjson.JSON;

/**
 * @author Eric Zhao
 * @since 1.4.0
 */
@CommandMapping(name = "cluster/server/modifyFlowConfig", desc = "modify cluster server flow config")
public class ModifyClusterServerFlowConfigHandler implements CommandHandler<String> {

    @Override
    public CommandResponse<String> handle(CommandRequest request) {
        String data = request.getParam("data");
        if (StringUtil.isBlank(data)) {
            return CommandResponse.ofFailure(new IllegalArgumentException("empty data"));
        }
        String namespace = request.getParam("namespace");
        try {
            data = URLDecoder.decode(data, "utf-8");

            if (StringUtil.isEmpty(namespace)) {
                RecordLog.info("[ModifyClusterServerFlowConfigHandler] Receiving cluster server global flow config: {}", data);
                ServerFlowConfig config = JSON.parseObject(data, ServerFlowConfig.class);
                if (!ClusterServerConfigManager.isValidFlowConfig(config)) {
                    CommandResponse.ofFailure(new IllegalArgumentException("Bad flow config"));
                }
                ClusterServerConfigManager.loadGlobalFlowConfig(config);
            } else {
                RecordLog.info("[ModifyClusterServerFlowConfigHandler] Receiving cluster server flow config for namespace <{}>: {}", namespace, data);
                ServerFlowConfig config = JSON.parseObject(data, ServerFlowConfig.class);
                if (!ClusterServerConfigManager.isValidFlowConfig(config)) {
                    CommandResponse.ofFailure(new IllegalArgumentException("Bad flow config"));
                }
                ClusterServerConfigManager.loadFlowConfig(namespace, config);
            }

            return CommandResponse.ofSuccess("success");
        } catch (Exception e) {
            RecordLog.warn("[ModifyClusterServerFlowConfigHandler] Decode cluster server flow config error", e);
            return CommandResponse.ofFailure(e, "decode cluster server flow config error");
        }
    }
}
