/*******************************************************************************
 *  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.IdentityManagement;
using Amazon.IdentityManagement.Model;

namespace Amazon.PowerShell.Cmdlets.IAM
{
    /// <summary>
    /// Lists all the managed policies that are available in your Amazon Web Services account,
    /// including your own customer-defined managed policies and all Amazon Web Services managed
    /// policies.
    /// 
    ///  
    /// <para>
    /// You can filter the list of policies that is returned using the optional <code>OnlyAttached</code>,
    /// <code>Scope</code>, and <code>PathPrefix</code> parameters. For example, to list only
    /// the customer managed policies in your Amazon Web Services account, set <code>Scope</code>
    /// to <code>Local</code>. To list only Amazon Web Services managed policies, set <code>Scope</code>
    /// to <code>AWS</code>.
    /// </para><para>
    /// You can paginate the results using the <code>MaxItems</code> and <code>Marker</code>
    /// parameters.
    /// </para><para>
    /// For more information about managed policies, see <a href="https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html">Managed
    /// policies and inline policies</a> in the <i>IAM User Guide</i>.
    /// </para><note><para>
    /// IAM resource-listing operations return a subset of the available attributes for the
    /// resource. For example, this operation does not return tags, even though they are an
    /// attribute of the returned object. To view all of the information for a customer manged
    /// policy, see <a>GetPolicy</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", "IAMPolicyList")]
    [OutputType("Amazon.IdentityManagement.Model.ManagedPolicy")]
    [AWSCmdlet("Calls the AWS Identity and Access Management ListPolicies API operation.", Operation = new[] {"ListPolicies"}, SelectReturnType = typeof(Amazon.IdentityManagement.Model.ListPoliciesResponse), LegacyAlias="Get-IAMPolicies")]
    [AWSCmdletOutput("Amazon.IdentityManagement.Model.ManagedPolicy or Amazon.IdentityManagement.Model.ListPoliciesResponse",
        "This cmdlet returns a collection of Amazon.IdentityManagement.Model.ManagedPolicy objects.",
        "The service call response (type Amazon.IdentityManagement.Model.ListPoliciesResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack."
    )]
    public partial class GetIAMPolicyListCmdlet : AmazonIdentityManagementServiceClientCmdlet, IExecutor
    {
        
        #region Parameter OnlyAttached
        /// <summary>
        /// <para>
        /// <para>A flag to filter the results to only the attached policies.</para><para>When <code>OnlyAttached</code> is <code>true</code>, the returned list contains only
        /// the policies that are attached to an IAM user, group, or role. When <code>OnlyAttached</code>
        /// is <code>false</code>, or when the parameter is not included, all policies are returned.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.Boolean? OnlyAttached { get; set; }
        #endregion
        
        #region Parameter PathPrefix
        /// <summary>
        /// <para>
        /// <para>The path prefix for filtering the results. This parameter is optional. If it is not
        /// included, it defaults to a slash (/), listing all policies. This parameter allows
        /// (through its <a href="http://wikipedia.org/wiki/regex">regex pattern</a>) a string
        /// of characters consisting of either a forward slash (/) by itself or a string that
        /// must begin and end with forward slashes. In addition, it can contain any ASCII character
        /// from the ! (<code>\u0021</code>) through the DEL character (<code>\u007F</code>),
        /// including most punctuation characters, digits, and upper and lowercased letters.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.String PathPrefix { get; set; }
        #endregion
        
        #region Parameter PolicyUsageFilter
        /// <summary>
        /// <para>
        /// <para>The policy usage method to use for filtering the results.</para><para>To list only permissions policies, set <code>PolicyUsageFilter</code> to <code>PermissionsPolicy</code>.
        /// To list only the policies used to set permissions boundaries, set the value to <code>PermissionsBoundary</code>.</para><para>This parameter is optional. If it is not included, all policies are returned. </para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [AWSConstantClassSource("Amazon.IdentityManagement.PolicyUsageType")]
        public Amazon.IdentityManagement.PolicyUsageType PolicyUsageFilter { get; set; }
        #endregion
        
        #region Parameter Scope
        /// <summary>
        /// <para>
        /// <para>The scope to use for filtering the results.</para><para>To list only Amazon Web Services managed policies, set <code>Scope</code> to <code>AWS</code>.
        /// To list only the customer managed policies in your Amazon Web Services account, set
        /// <code>Scope</code> to <code>Local</code>.</para><para>This parameter is optional. If it is not included, or if it is set to <code>All</code>,
        /// all policies are returned.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [AWSConstantClassSource("Amazon.IdentityManagement.PolicyScopeType")]
        public Amazon.IdentityManagement.PolicyScopeType Scope { get; set; }
        #endregion
        
        #region Parameter Marker
        /// <summary>
        /// <para>
        /// <para>Use this parameter only when paginating results and only after you receive a response
        /// indicating that the results are truncated. Set it to the value of the <code>Marker</code>
        /// element in the response that you received to indicate where the next call should start.</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.Marker' 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>Use this only when paginating results to indicate the maximum number of items you
        /// want in the response. If additional items exist beyond the maximum you specify, the
        /// <code>IsTruncated</code> response element is <code>true</code>.</para><para>If you do not include this parameter, the number of items defaults to 100. Note that
        /// IAM might return fewer results, even when there are more results available. In that
        /// case, the <code>IsTruncated</code> response element returns <code>true</code>, and
        /// <code>Marker</code> contains a value to include in the subsequent call that tells
        /// the service where to continue from.</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 'Policies'.
        /// Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.IdentityManagement.Model.ListPoliciesResponse).
        /// Specifying the name of a property of type Amazon.IdentityManagement.Model.ListPoliciesResponse 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; } = "Policies";
        #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.IdentityManagement.Model.ListPoliciesResponse, GetIAMPolicyListCmdlet>(Select) ??
                    throw new System.ArgumentException("Invalid value for -Select parameter.", nameof(this.Select));
            }
            context.Marker = this.Marker;
            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
            context.OnlyAttached = this.OnlyAttached;
            context.PathPrefix = this.PathPrefix;
            context.PolicyUsageFilter = this.PolicyUsageFilter;
            context.Scope = this.Scope;
            
            // 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.IdentityManagement.Model.ListPoliciesRequest();
            
            if (cmdletContext.MaxItem != null)
            {
                request.MaxItems = AutoIterationHelpers.ConvertEmitLimitToServiceTypeInt32(cmdletContext.MaxItem.Value);
            }
            if (cmdletContext.OnlyAttached != null)
            {
                request.OnlyAttached = cmdletContext.OnlyAttached.Value;
            }
            if (cmdletContext.PathPrefix != null)
            {
                request.PathPrefix = cmdletContext.PathPrefix;
            }
            if (cmdletContext.PolicyUsageFilter != null)
            {
                request.PolicyUsageFilter = cmdletContext.PolicyUsageFilter;
            }
            if (cmdletContext.Scope != null)
            {
                request.Scope = cmdletContext.Scope;
            }
            
            // 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.Marker;
                }
                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.IdentityManagement.Model.ListPoliciesRequest();
            if (cmdletContext.OnlyAttached != null)
            {
                request.OnlyAttached = cmdletContext.OnlyAttached.Value;
            }
            if (cmdletContext.PathPrefix != null)
            {
                request.PathPrefix = cmdletContext.PathPrefix;
            }
            if (cmdletContext.PolicyUsageFilter != null)
            {
                request.PolicyUsageFilter = cmdletContext.PolicyUsageFilter;
            }
            if (cmdletContext.Scope != null)
            {
                request.Scope = cmdletContext.Scope;
            }
            
            // 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 1000. 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 1000 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(1000, _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.Policies.Count;
                    
                    _nextToken = response.Marker;
                    _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.IdentityManagement.Model.ListPoliciesResponse CallAWSServiceOperation(IAmazonIdentityManagementService client, Amazon.IdentityManagement.Model.ListPoliciesRequest request)
        {
            Utils.Common.WriteVerboseEndpointMessage(this, client.Config, "AWS Identity and Access Management", "ListPolicies");
            try
            {
                #if DESKTOP
                return client.ListPolicies(request);
                #elif CORECLR
                return client.ListPoliciesAsync(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.String Marker { get; set; }
            public int? MaxItem { get; set; }
            public System.Boolean? OnlyAttached { get; set; }
            public System.String PathPrefix { get; set; }
            public Amazon.IdentityManagement.PolicyUsageType PolicyUsageFilter { get; set; }
            public Amazon.IdentityManagement.PolicyScopeType Scope { get; set; }
            public System.Func<Amazon.IdentityManagement.Model.ListPoliciesResponse, GetIAMPolicyListCmdlet, object> Select { get; set; } =
                (response, cmdlet) => response.Policies;
        }
        
    }
}