/**
 * Copyright © 2016-2018 The Thingsboard Authors
 *
 * 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.thingsboard.server.extensions.api.plugins.handlers;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpMethod;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.thingsboard.server.extensions.api.plugins.PluginContext;
import org.thingsboard.server.extensions.api.plugins.rest.PluginRestMsg;

import javax.servlet.ServletException;

/**
 * @author Andrew Shvayka
 */
@Slf4j
public class DefaultRestMsgHandler implements RestMsgHandler {

    protected final ObjectMapper jsonMapper = new ObjectMapper();

    @Override
    public void process(PluginContext ctx, PluginRestMsg msg) {
        try {
            log.debug("[{}] Processing REST msg: {}", ctx.getPluginId(), msg);
            HttpMethod method = msg.getRequest().getMethod();
            switch (method) {
                case GET:
                    handleHttpGetRequest(ctx, msg);
                    break;
                case POST:
                    handleHttpPostRequest(ctx, msg);
                    break;
                case DELETE:
                    handleHttpDeleteRequest(ctx, msg);
                    break;
                default:
                    msg.getResponseHolder().setErrorResult(new HttpRequestMethodNotSupportedException(method.name()));
            }
            log.debug("[{}] Processed REST msg.", ctx.getPluginId());
        } catch (Exception e) {
            log.warn("[{}] Exception during REST msg processing: {}", ctx.getPluginId(), e.getMessage(), e);
            msg.getResponseHolder().setErrorResult(e);
        }
    }

    protected void handleHttpGetRequest(PluginContext ctx, PluginRestMsg msg) throws ServletException {
        msg.getResponseHolder().setErrorResult(new HttpRequestMethodNotSupportedException(HttpMethod.GET.name()));
    }

    protected void handleHttpPostRequest(PluginContext ctx, PluginRestMsg msg) throws ServletException {
        msg.getResponseHolder().setErrorResult(new HttpRequestMethodNotSupportedException(HttpMethod.POST.name()));
    }

    protected void handleHttpDeleteRequest(PluginContext ctx, PluginRestMsg msg) throws ServletException {
        msg.getResponseHolder().setErrorResult(new HttpRequestMethodNotSupportedException(HttpMethod.DELETE.name()));
    }

}
