/*******************************************************************************
 *  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.Lambda;
using Amazon.Lambda.Model;

namespace Amazon.PowerShell.Cmdlets.LM
{
    /// <summary>
    /// Returns a list of Lambda functions, with the version-specific configuration of each.
    /// Lambda returns up to 50 functions per call.
    /// 
    ///  
    /// <para>
    /// Set <code>FunctionVersion</code> to <code>ALL</code> to include all published versions
    /// of each function in addition to the unpublished version.
    /// </para><note><para>
    /// The <code>ListFunctions</code> operation returns a subset of the <a>FunctionConfiguration</a>
    /// fields. To get the additional fields (State, StateReasonCode, StateReason, LastUpdateStatus,
    /// LastUpdateStatusReason, LastUpdateStatusReasonCode, RuntimeVersionConfig) for a function
    /// or version, use <a>GetFunction</a>.
    /// </para></note><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", "LMFunctionList")]
    [OutputType("Amazon.Lambda.Model.FunctionConfiguration")]
    [AWSCmdlet("Calls the AWS Lambda ListFunctions API operation.", Operation = new[] {"ListFunctions"}, SelectReturnType = typeof(Amazon.Lambda.Model.ListFunctionsResponse), LegacyAlias="Get-LMFunctions")]
    [AWSCmdletOutput("Amazon.Lambda.Model.FunctionConfiguration or Amazon.Lambda.Model.ListFunctionsResponse",
        "This cmdlet returns a collection of Amazon.Lambda.Model.FunctionConfiguration objects.",
        "The service call response (type Amazon.Lambda.Model.ListFunctionsResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack."
    )]
    public partial class GetLMFunctionListCmdlet : AmazonLambdaClientCmdlet, IExecutor
    {
        
        protected override bool IsSensitiveResponse { get; set; } = true;
        
        #region Parameter FunctionVersion
        /// <summary>
        /// <para>
        /// <para>Set to <code>ALL</code> to include entries for all published versions of each function.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [AWSConstantClassSource("Amazon.Lambda.FunctionVersion")]
        public Amazon.Lambda.FunctionVersion FunctionVersion { get; set; }
        #endregion
        
        #region Parameter MasterRegion
        /// <summary>
        /// <para>
        /// <para>For Lambda@Edge functions, the Amazon Web Services Region of the master function.
        /// For example, <code>us-east-1</code> filters the list of functions to include only
        /// Lambda@Edge functions replicated from a master function in US East (N. Virginia).
        /// If specified, you must set <code>FunctionVersion</code> to <code>ALL</code>.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.String MasterRegion { get; set; }
        #endregion
        
        #region Parameter Marker
        /// <summary>
        /// <para>
        /// <para>Specify the pagination token that's returned by a previous request to retrieve the
        /// next page of results.</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 '-Marker $null' for the first call and '-Marker $AWSHistory.LastServiceResponse.NextMarker' for subsequent calls.
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [Alias("NextToken")]
        public System.String Marker { get; set; }
        #endregion
        
        #region Parameter MaxItem
        /// <summary>
        /// <para>
        /// <para>The maximum number of functions to return in the response. Note that <code>ListFunctions</code>
        /// returns a maximum of 50 items in each response, even if you set the number higher.</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? MaxItem { get; set; }
        #endregion
        
        #region Parameter Select
        /// <summary>
        /// Use the -Select parameter to control the cmdlet output. The default value is 'Functions'.
        /// Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.Lambda.Model.ListFunctionsResponse).
        /// Specifying the name of a property of type Amazon.Lambda.Model.ListFunctionsResponse 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; } = "Functions";
        #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 Marker
        /// 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);
            
            if (ParameterWasBound(nameof(this.Select)))
            {
                context.Select = CreateSelectDelegate<Amazon.Lambda.Model.ListFunctionsResponse, GetLMFunctionListCmdlet>(Select) ??
                    throw new System.ArgumentException("Invalid value for -Select parameter.", nameof(this.Select));
            }
            context.FunctionVersion = this.FunctionVersion;
            context.Marker = this.Marker;
            context.MasterRegion = this.MasterRegion;
            context.MaxItem = this.MaxItem;
            #if !MODULAR
            if (ParameterWasBound(nameof(this.MaxItem)) && this.MaxItem.HasValue)
            {
                WriteWarning("AWSPowerShell and AWSPowerShell.NetCore use the MaxItem 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 MaxItem" +
                    " to the service to specify how many items should be returned by each service call.");
            }
            #endif
            
            // 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;
            var useParameterSelect = this.Select.StartsWith("^");
            
            // create request and set iteration invariants
            var request = new Amazon.Lambda.Model.ListFunctionsRequest();
            
            if (cmdletContext.FunctionVersion != null)
            {
                request.FunctionVersion = cmdletContext.FunctionVersion;
            }
            if (cmdletContext.MasterRegion != null)
            {
                request.MasterRegion = cmdletContext.MasterRegion;
            }
            if (cmdletContext.MaxItem != null)
            {
                request.MaxItems = AutoIterationHelpers.ConvertEmitLimitToServiceTypeInt32(cmdletContext.MaxItem.Value);
            }
            
            // Initialize loop variant and commence piping
            var _nextToken = cmdletContext.Marker;
            var _userControllingPaging = this.NoAutoIteration.IsPresent || ParameterWasBound(nameof(this.Marker));
            
            var client = Client ?? CreateClient(_CurrentCredentials, _RegionEndpoint);
            do
            {
                request.Marker = _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.NextMarker;
                }
                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("^");
            
            // create request and set iteration invariants
            var request = new Amazon.Lambda.Model.ListFunctionsRequest();
            if (cmdletContext.FunctionVersion != null)
            {
                request.FunctionVersion = cmdletContext.FunctionVersion;
            }
            if (cmdletContext.MasterRegion != null)
            {
                request.MasterRegion = cmdletContext.MasterRegion;
            }
            
            // Initialize loop variants and commence piping
            System.String _nextToken = null;
            int? _emitLimit = null;
            int _retrievedSoFar = 0;
            if (AutoIterationHelpers.HasValue(cmdletContext.Marker))
            {
                _nextToken = cmdletContext.Marker;
            }
            if (cmdletContext.MaxItem.HasValue)
            {
                // The service has a maximum page size of 10000. 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 10000 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.MaxItem;
            }
            var _userControllingPaging = this.NoAutoIteration.IsPresent || ParameterWasBound(nameof(this.Marker));
            
            var client = Client ?? CreateClient(_CurrentCredentials, _RegionEndpoint);
            do
            {
                request.Marker = _nextToken;
                if (_emitLimit.HasValue)
                {
                    int correctPageSize = Math.Min(10000, _emitLimit.Value);
                    request.MaxItems = 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.Functions.Count;
                    
                    _nextToken = response.NextMarker;
                    _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.Lambda.Model.ListFunctionsResponse CallAWSServiceOperation(IAmazonLambda client, Amazon.Lambda.Model.ListFunctionsRequest request)
        {
            Utils.Common.WriteVerboseEndpointMessage(this, client.Config, "AWS Lambda", "ListFunctions");
            try
            {
                #if DESKTOP
                return client.ListFunctions(request);
                #elif CORECLR
                return client.ListFunctionsAsync(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 Amazon.Lambda.FunctionVersion FunctionVersion { get; set; }
            public System.String Marker { get; set; }
            public System.String MasterRegion { get; set; }
            public int? MaxItem { get; set; }
            public System.Func<Amazon.Lambda.Model.ListFunctionsResponse, GetLMFunctionListCmdlet, object> Select { get; set; } =
                (response, cmdlet) => response.Functions;
        }
        
    }
}