/*
 * Copyright Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 * 
 *  http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file 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.
 */
using System;
using System.IO;
using System.Text;
using System.Net;
using System.Reflection;
using System.Web;

using Amazon.Util;
using System.Globalization;

namespace Amazon.CloudFormation.Util
{
    /// <summary>
    /// Utility methods for CloudFormation.
    /// </summary>
    public static class AmazonCloudFormationUtil
    {
        /// <summary>
        /// This method will signal to the CloudFormation the status of a wait condition.
        /// </summary>
        /// <param name="presignedURL">The URL returned from the creation of a WaitHandle in a CloudFormation Stack</param>
        /// <param name="status">SUCCESS or FAILURE for the status of a stack</param>
        /// <param name="reason">The reason for the status</param>
        /// <param name="uniqueId">A unique identifier for the signal.  Using <c>Guid.NewGuid().ToString()</c>can be used for this.</param>
        /// <param name="data">Data to be passed back for later use in the template.</param>
        public static void SignalWaitCondition(string presignedURL, string status, string reason, string uniqueId, string data)
        {
            string requestBody = string.Format(CultureInfo.InvariantCulture, 
                "{{" +
                  "\"Status\" : \"{0}\"," +
                  "\"Reason\" : \"{1}\"," +
                  "\"UniqueId\" : \"{2}\"," +
                  "\"Data\" : \"{3}\"" +
                "}}", status, reason, uniqueId, data);

            Uri uri = new Uri(presignedURL);
            AWSSDKUtils.ForceCanonicalPathAndQuery(uri);
            var httpRequest = WebRequest.Create(uri);
            httpRequest.Method = "PUT";
            httpRequest.ContentType = "";
            httpRequest.ContentLength = requestBody.Length;

            using (var stream = new StreamWriter(httpRequest.GetRequestStream()))
            {
                stream.Write(requestBody);
            }

            using(httpRequest.GetResponse())
            { }
        }
    }
}