/*******************************************************************************
 *  Copyright 2012-2019 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.
 * *****************************************************************************
 *
 *  AWS Tools for Windows (TM) PowerShell (TM)
 *
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Management.Automation;
using System.Text;
using Amazon.PowerShell.Common;
using Amazon.Runtime;
using Amazon.CloudWatchLogs;
using Amazon.CloudWatchLogs.Model;

namespace Amazon.PowerShell.Cmdlets.CWL
{
    /// <summary>
    /// Lists the log streams for the specified log group. You can list all the log streams
    /// or filter the results by prefix. You can also control how the results are ordered.
    /// 
    ///  
    /// <para>
    /// You can specify the log group to search by using either <code>logGroupIdentifier</code>
    /// or <code>logGroupName</code>. You must include one of these two parameters, but you
    /// can't include both. 
    /// </para><para>
    /// This operation has a limit of five transactions per second, after which transactions
    /// are throttled.
    /// </para><para>
    /// If you are using CloudWatch cross-account observability, you can use this operation
    /// in a monitoring account and view data from the linked source accounts. For more information,
    /// see <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Unified-Cross-Account.html">CloudWatch
    /// cross-account observability</a>.
    /// </para><br/><br/>This cmdlet automatically pages all available results to the pipeline - parameters related to iteration are only needed if you want to manually control the paginated output. To disable autopagination, use -NoAutoIteration.
    /// </summary>
    [Cmdlet("Get", "CWLLogStream")]
    [OutputType("Amazon.CloudWatchLogs.Model.LogStream")]
    [AWSCmdlet("Calls the Amazon CloudWatch Logs DescribeLogStreams API operation.", Operation = new[] {"DescribeLogStreams"}, SelectReturnType = typeof(Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse), LegacyAlias="Get-CWLLogStreams")]
    [AWSCmdletOutput("Amazon.CloudWatchLogs.Model.LogStream or Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse",
        "This cmdlet returns a collection of Amazon.CloudWatchLogs.Model.LogStream objects.",
        "The service call response (type Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack."
    )]
    public partial class GetCWLLogStreamCmdlet : AmazonCloudWatchLogsClientCmdlet, IExecutor
    {
        
        #region Parameter Descending
        /// <summary>
        /// <para>
        /// <para>If the value is true, results are returned in descending order. If the value is to
        /// false, results are returned in ascending order. The default value is false.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.Boolean? Descending { get; set; }
        #endregion
        
        #region Parameter LogGroupIdentifier
        /// <summary>
        /// <para>
        /// <para>Specify either the name or ARN of the log group to view. If the log group is in a
        /// source account and you are using a monitoring account, you must use the log group
        /// ARN.</para><note><para> You must include either <code>logGroupIdentifier</code> or <code>logGroupName</code>,
        /// but not both. </para></note>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.String LogGroupIdentifier { get; set; }
        #endregion
        
        #region Parameter LogGroupName
        /// <summary>
        /// <para>
        /// <para>The name of the log group.</para><note><para> You must include either <code>logGroupIdentifier</code> or <code>logGroupName</code>,
        /// but not both. </para></note>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(Position = 0, ValueFromPipelineByPropertyName = true, ValueFromPipeline = true)]
        public System.String LogGroupName { get; set; }
        #endregion
        
        #region Parameter LogStreamNamePrefix
        /// <summary>
        /// <para>
        /// <para>The prefix to match.</para><para>If <code>orderBy</code> is <code>LastEventTime</code>, you cannot specify this parameter.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.String LogStreamNamePrefix { get; set; }
        #endregion
        
        #region Parameter OrderBy
        /// <summary>
        /// <para>
        /// <para>If the value is <code>LogStreamName</code>, the results are ordered by log stream
        /// name. If the value is <code>LastEventTime</code>, the results are ordered by the event
        /// time. The default value is <code>LogStreamName</code>.</para><para>If you order the results by event time, you cannot specify the <code>logStreamNamePrefix</code>
        /// parameter.</para><para><code>lastEventTimestamp</code> represents the time of the most recent log event
        /// in the log stream in CloudWatch Logs. This number is expressed as the number of milliseconds
        /// after <code>Jan 1, 1970 00:00:00 UTC</code>. <code>lastEventTimestamp</code> updates
        /// on an eventual consistency basis. It typically updates in less than an hour from ingestion,
        /// but in rare situations might take longer.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [AWSConstantClassSource("Amazon.CloudWatchLogs.OrderBy")]
        public Amazon.CloudWatchLogs.OrderBy OrderBy { get; set; }
        #endregion
        
        #region Parameter Limit
        /// <summary>
        /// <para>
        /// <para>The maximum number of items returned. If you don't specify a value, the default is
        /// up to 50 items.</para>
        /// </para>
        /// <para>
        /// <br/><b>Note:</b> In AWSPowerShell and AWSPowerShell.NetCore this parameter is used to limit the total number of items returned by the cmdlet.
        /// <br/>In AWS.Tools this parameter is simply passed to the service to specify how many items should be returned by each service call.
        /// <br/>Pipe the output of this cmdlet into Select-Object -First to terminate retrieving data pages early and control the number of items returned.
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [Alias("MaxItems")]
        public int? Limit { get; set; }
        #endregion
        
        #region Parameter NextToken
        /// <summary>
        /// <para>
        /// <para>The token for the next set of items to return. (You received this token from a previous
        /// call.)</para>
        /// </para>
        /// <para>
        /// <br/><b>Note:</b> This parameter is only used if you are manually controlling output pagination of the service API call.
        /// <br/>In order to manually control output pagination, use '-NextToken $null' for the first call and '-NextToken $AWSHistory.LastServiceResponse.NextToken' for subsequent calls.
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.String NextToken { get; set; }
        #endregion
        
        #region Parameter Select
        /// <summary>
        /// Use the -Select parameter to control the cmdlet output. The default value is 'LogStreams'.
        /// Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse).
        /// Specifying the name of a property of type Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse will result in that property being returned.
        /// Specifying -Select '^ParameterName' will result in the cmdlet returning the selected cmdlet parameter value.
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public string Select { get; set; } = "LogStreams";
        #endregion
        
        #region Parameter PassThru
        /// <summary>
        /// Changes the cmdlet behavior to return the value passed to the LogGroupName parameter.
        /// The -PassThru parameter is deprecated, use -Select '^LogGroupName' instead. This parameter will be removed in a future version.
        /// </summary>
        [System.Obsolete("The -PassThru parameter is deprecated, use -Select '^LogGroupName' instead. This parameter will be removed in a future version.")]
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public SwitchParameter PassThru { get; set; }
        #endregion
        
        #region Parameter NoAutoIteration
        /// <summary>
        /// By default the cmdlet will auto-iterate and retrieve all results to the pipeline by performing multiple
        /// service calls. If set, the cmdlet will retrieve only the next 'page' of results using the value of NextToken
        /// as the start point.
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public SwitchParameter NoAutoIteration { get; set; }
        #endregion
        
        protected override void ProcessRecord()
        {
            this._AWSSignerType = "v4";
            base.ProcessRecord();
            
            var context = new CmdletContext();
            
            // allow for manipulation of parameters prior to loading into context
            PreExecutionContextLoad(context);
            
            #pragma warning disable CS0618, CS0612 //A class member was marked with the Obsolete attribute
            if (ParameterWasBound(nameof(this.Select)))
            {
                context.Select = CreateSelectDelegate<Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse, GetCWLLogStreamCmdlet>(Select) ??
                    throw new System.ArgumentException("Invalid value for -Select parameter.", nameof(this.Select));
                if (this.PassThru.IsPresent)
                {
                    throw new System.ArgumentException("-PassThru cannot be used when -Select is specified.", nameof(this.Select));
                }
            }
            else if (this.PassThru.IsPresent)
            {
                context.Select = (response, cmdlet) => this.LogGroupName;
            }
            #pragma warning restore CS0618, CS0612 //A class member was marked with the Obsolete attribute
            context.Descending = this.Descending;
            context.Limit = this.Limit;
            #if !MODULAR
            if (ParameterWasBound(nameof(this.Limit)) && this.Limit.HasValue)
            {
                WriteWarning("AWSPowerShell and AWSPowerShell.NetCore use the Limit parameter to limit the total number of items returned by the cmdlet." +
                    " This behavior is obsolete and will be removed in a future version of these modules. Pipe the output of this cmdlet into Select-Object -First to terminate" +
                    " retrieving data pages early and control the number of items returned. AWS.Tools already implements the new behavior of simply passing Limit" +
                    " to the service to specify how many items should be returned by each service call.");
            }
            #endif
            context.LogGroupIdentifier = this.LogGroupIdentifier;
            context.LogGroupName = this.LogGroupName;
            context.LogStreamNamePrefix = this.LogStreamNamePrefix;
            context.NextToken = this.NextToken;
            context.OrderBy = this.OrderBy;
            
            // allow further manipulation of loaded context prior to processing
            PostExecutionContextLoad(context);
            
            var output = Execute(context) as CmdletOutput;
            ProcessOutput(output);
        }
        
        #region IExecutor Members
        
        #if MODULAR
        public object Execute(ExecutorContext context)
        {
            var cmdletContext = context as CmdletContext;
            #pragma warning disable CS0618, CS0612 //A class member was marked with the Obsolete attribute
            var useParameterSelect = this.Select.StartsWith("^") || this.PassThru.IsPresent;
            #pragma warning restore CS0618, CS0612 //A class member was marked with the Obsolete attribute
            
            // create request and set iteration invariants
            var request = new Amazon.CloudWatchLogs.Model.DescribeLogStreamsRequest();
            
            if (cmdletContext.Descending != null)
            {
                request.Descending = cmdletContext.Descending.Value;
            }
            if (cmdletContext.Limit != null)
            {
                request.Limit = AutoIterationHelpers.ConvertEmitLimitToServiceTypeInt32(cmdletContext.Limit.Value);
            }
            if (cmdletContext.LogGroupIdentifier != null)
            {
                request.LogGroupIdentifier = cmdletContext.LogGroupIdentifier;
            }
            if (cmdletContext.LogGroupName != null)
            {
                request.LogGroupName = cmdletContext.LogGroupName;
            }
            if (cmdletContext.LogStreamNamePrefix != null)
            {
                request.LogStreamNamePrefix = cmdletContext.LogStreamNamePrefix;
            }
            if (cmdletContext.OrderBy != null)
            {
                request.OrderBy = cmdletContext.OrderBy;
            }
            
            // Initialize loop variant and commence piping
            var _nextToken = cmdletContext.NextToken;
            var _userControllingPaging = this.NoAutoIteration.IsPresent || ParameterWasBound(nameof(this.NextToken));
            
            var client = Client ?? CreateClient(_CurrentCredentials, _RegionEndpoint);
            do
            {
                request.NextToken = _nextToken;
                
                CmdletOutput output;
                
                try
                {
                    
                    var response = CallAWSServiceOperation(client, request);
                    
                    object pipelineOutput = null;
                    if (!useParameterSelect)
                    {
                        pipelineOutput = cmdletContext.Select(response, this);
                    }
                    output = new CmdletOutput
                    {
                        PipelineOutput = pipelineOutput,
                        ServiceResponse = response
                    };
                    
                    _nextToken = response.NextToken;
                }
                catch (Exception e)
                {
                    output = new CmdletOutput { ErrorResponse = e };
                }
                
                ProcessOutput(output);
                
            } while (!_userControllingPaging && AutoIterationHelpers.HasValue(_nextToken));
            
            if (useParameterSelect)
            {
                WriteObject(cmdletContext.Select(null, this));
            }
            
            
            return null;
        }
        #else
        public object Execute(ExecutorContext context)
        {
            var cmdletContext = context as CmdletContext;
            var useParameterSelect = this.Select.StartsWith("^") || this.PassThru.IsPresent;
            
            // create request and set iteration invariants
            var request = new Amazon.CloudWatchLogs.Model.DescribeLogStreamsRequest();
            if (cmdletContext.Descending != null)
            {
                request.Descending = cmdletContext.Descending.Value;
            }
            if (cmdletContext.LogGroupIdentifier != null)
            {
                request.LogGroupIdentifier = cmdletContext.LogGroupIdentifier;
            }
            if (cmdletContext.LogGroupName != null)
            {
                request.LogGroupName = cmdletContext.LogGroupName;
            }
            if (cmdletContext.LogStreamNamePrefix != null)
            {
                request.LogStreamNamePrefix = cmdletContext.LogStreamNamePrefix;
            }
            if (cmdletContext.OrderBy != null)
            {
                request.OrderBy = cmdletContext.OrderBy;
            }
            
            // Initialize loop variants and commence piping
            System.String _nextToken = null;
            int? _emitLimit = null;
            int _retrievedSoFar = 0;
            if (AutoIterationHelpers.HasValue(cmdletContext.NextToken))
            {
                _nextToken = cmdletContext.NextToken;
            }
            if (cmdletContext.Limit.HasValue)
            {
                // The service has a maximum page size of 50. If the user has
                // asked for more items than page max, and there is no page size
                // configured, we rely on the service ignoring the set maximum
                // and giving us 50 items back. If a page size is set, that will
                // be used to configure the pagination.
                // We'll make further calls to satisfy the user's request.
                _emitLimit = cmdletContext.Limit;
            }
            var _userControllingPaging = this.NoAutoIteration.IsPresent || ParameterWasBound(nameof(this.NextToken));
            
            var client = Client ?? CreateClient(_CurrentCredentials, _RegionEndpoint);
            do
            {
                request.NextToken = _nextToken;
                if (_emitLimit.HasValue)
                {
                    int correctPageSize = Math.Min(50, _emitLimit.Value);
                    request.Limit = AutoIterationHelpers.ConvertEmitLimitToInt32(correctPageSize);
                }
                
                CmdletOutput output;
                
                try
                {
                    
                    var response = CallAWSServiceOperation(client, request);
                    object pipelineOutput = null;
                    if (!useParameterSelect)
                    {
                        pipelineOutput = cmdletContext.Select(response, this);
                    }
                    output = new CmdletOutput
                    {
                        PipelineOutput = pipelineOutput,
                        ServiceResponse = response
                    };
                    int _receivedThisCall = response.LogStreams.Count;
                    
                    _nextToken = response.NextToken;
                    _retrievedSoFar += _receivedThisCall;
                    if (_emitLimit.HasValue)
                    {
                        _emitLimit -= _receivedThisCall;
                    }
                }
                catch (Exception e)
                {
                    if (_retrievedSoFar == 0 || !_emitLimit.HasValue)
                    {
                        output = new CmdletOutput { ErrorResponse = e };
                    }
                    else
                    {
                        break;
                    }
                }
                
                ProcessOutput(output);
            } while (!_userControllingPaging && AutoIterationHelpers.HasValue(_nextToken) && (!_emitLimit.HasValue || _emitLimit.Value >= 1));
            
            
            if (useParameterSelect)
            {
                WriteObject(cmdletContext.Select(null, this));
            }
            
            
            return null;
        }
        #endif
        
        public ExecutorContext CreateContext()
        {
            return new CmdletContext();
        }
        
        #endregion
        
        #region AWS Service Operation Call
        
        private Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse CallAWSServiceOperation(IAmazonCloudWatchLogs client, Amazon.CloudWatchLogs.Model.DescribeLogStreamsRequest request)
        {
            Utils.Common.WriteVerboseEndpointMessage(this, client.Config, "Amazon CloudWatch Logs", "DescribeLogStreams");
            try
            {
                #if DESKTOP
                return client.DescribeLogStreams(request);
                #elif CORECLR
                return client.DescribeLogStreamsAsync(request).GetAwaiter().GetResult();
                #else
                        #error "Unknown build edition"
                #endif
            }
            catch (AmazonServiceException exc)
            {
                var webException = exc.InnerException as System.Net.WebException;
                if (webException != null)
                {
                    throw new Exception(Utils.Common.FormatNameResolutionFailureMessage(client.Config, webException.Message), webException);
                }
                throw;
            }
        }
        
        #endregion
        
        internal partial class CmdletContext : ExecutorContext
        {
            public System.Boolean? Descending { get; set; }
            public int? Limit { get; set; }
            public System.String LogGroupIdentifier { get; set; }
            public System.String LogGroupName { get; set; }
            public System.String LogStreamNamePrefix { get; set; }
            public System.String NextToken { get; set; }
            public Amazon.CloudWatchLogs.OrderBy OrderBy { get; set; }
            public System.Func<Amazon.CloudWatchLogs.Model.DescribeLogStreamsResponse, GetCWLLogStreamCmdlet, object> Select { get; set; } =
                (response, cmdlet) => response.LogStreams;
        }
        
    }
}