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/*
 * Copyright (C) 2007-2017 Crafter Software Corporation.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.craftercms.commons.rest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;

/**
 * REST client request interceptor that logs the whole request and response. Useful for debugging.
 *
 * @author avasquez
 */
public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor {

    private final static Logger logger = LoggerFactory.getLogger(LoggingRequestInterceptor.class);

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        traceRequest(request, body);

        ClientHttpResponse response = execution.execute(request, body);

        traceResponse(response);

        return response;
    }

    private void traceRequest(HttpRequest request, byte[] body) throws IOException {
        logger.debug("===========================request begin================================================");
        logger.debug("URI         : {}", request.getURI());
        logger.debug("Method      : {}", request.getMethod());
        logger.debug("Headers     : {}", request.getHeaders() );
        logger.debug("Request body: {}", new String(body, "UTF-8"));
        logger.debug("==========================request end================================================");
    }

    private void traceResponse(ClientHttpResponse response) throws IOException {
        StringBuilder inputStringBuilder = new StringBuilder();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response.getBody(), "UTF-8"));
        String line = bufferedReader.readLine();

        while (line != null) {
            inputStringBuilder.append(line);
            inputStringBuilder.append('\n');
            line = bufferedReader.readLine();
        }

        logger.debug("============================response begin==========================================");
        logger.debug("Status code  : {}", response.getStatusCode());
        logger.debug("Status text  : {}", response.getStatusText());
        logger.debug("Headers      : {}", response.getHeaders());
        logger.debug("Response body: {}", inputStringBuilder.toString());
        logger.debug("=======================response end=================================================");
    }

}