/*******************************************************************************
 *  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.EC2;
using Amazon.EC2.Model;

namespace Amazon.PowerShell.Cmdlets.EC2
{
    /// <summary>
    /// Describes the status of the specified instances or all of your instances. By default,
    /// only running instances are described, unless you specifically indicate to return the
    /// status of all instances.
    /// 
    ///  
    /// <para>
    /// Instance status includes the following components:
    /// </para><ul><li><para><b>Status checks</b> - Amazon EC2 performs status checks on running EC2 instances
    /// to identify hardware and software issues. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-system-instance-status-check.html">Status
    /// checks for your instances</a> and <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstances.html">Troubleshoot
    /// instances with failed status checks</a> in the <i>Amazon EC2 User Guide</i>.
    /// </para></li><li><para><b>Scheduled events</b> - Amazon EC2 can schedule events (such as reboot, stop, or
    /// terminate) for your instances related to hardware issues, software updates, or system
    /// maintenance. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-instances-status-check_sched.html">Scheduled
    /// events for your instances</a> in the <i>Amazon EC2 User Guide</i>.
    /// </para></li><li><para><b>Instance state</b> - You can manage your instances from the moment you launch
    /// them through their termination. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-lifecycle.html">Instance
    /// lifecycle</a> in the <i>Amazon EC2 User Guide</i>.
    /// </para></li></ul><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", "EC2InstanceStatus")]
    [OutputType("Amazon.EC2.Model.InstanceStatus")]
    [AWSCmdlet("Calls the Amazon Elastic Compute Cloud (EC2) DescribeInstanceStatus API operation.", Operation = new[] {"DescribeInstanceStatus"}, SelectReturnType = typeof(Amazon.EC2.Model.DescribeInstanceStatusResponse))]
    [AWSCmdletOutput("Amazon.EC2.Model.InstanceStatus or Amazon.EC2.Model.DescribeInstanceStatusResponse",
        "This cmdlet returns a collection of Amazon.EC2.Model.InstanceStatus objects.",
        "The service call response (type Amazon.EC2.Model.DescribeInstanceStatusResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack."
    )]
    public partial class GetEC2InstanceStatusCmdlet : AmazonEC2ClientCmdlet, IExecutor
    {
        
        #region Parameter Filter
        /// <summary>
        /// <para>
        /// <para>The filters.</para><ul><li><para><code>availability-zone</code> - The Availability Zone of the instance.</para></li><li><para><code>event.code</code> - The code for the scheduled event (<code>instance-reboot</code>
        /// | <code>system-reboot</code> | <code>system-maintenance</code> | <code>instance-retirement</code>
        /// | <code>instance-stop</code>).</para></li><li><para><code>event.description</code> - A description of the event.</para></li><li><para><code>event.instance-event-id</code> - The ID of the event whose date and time you
        /// are modifying.</para></li><li><para><code>event.not-after</code> - The latest end time for the scheduled event (for example,
        /// <code>2014-09-15T17:15:20.000Z</code>).</para></li><li><para><code>event.not-before</code> - The earliest start time for the scheduled event (for
        /// example, <code>2014-09-15T17:15:20.000Z</code>).</para></li><li><para><code>event.not-before-deadline</code> - The deadline for starting the event (for
        /// example, <code>2014-09-15T17:15:20.000Z</code>).</para></li><li><para><code>instance-state-code</code> - The code for the instance state, as a 16-bit unsigned
        /// integer. The high byte is used for internal purposes and should be ignored. The low
        /// byte is set based on the state represented. The valid values are 0 (pending), 16 (running),
        /// 32 (shutting-down), 48 (terminated), 64 (stopping), and 80 (stopped).</para></li><li><para><code>instance-state-name</code> - The state of the instance (<code>pending</code>
        /// | <code>running</code> | <code>shutting-down</code> | <code>terminated</code> | <code>stopping</code>
        /// | <code>stopped</code>).</para></li><li><para><code>instance-status.reachability</code> - Filters on instance status where the
        /// name is <code>reachability</code> (<code>passed</code> | <code>failed</code> | <code>initializing</code>
        /// | <code>insufficient-data</code>).</para></li><li><para><code>instance-status.status</code> - The status of the instance (<code>ok</code>
        /// | <code>impaired</code> | <code>initializing</code> | <code>insufficient-data</code>
        /// | <code>not-applicable</code>).</para></li><li><para><code>system-status.reachability</code> - Filters on system status where the name
        /// is <code>reachability</code> (<code>passed</code> | <code>failed</code> | <code>initializing</code>
        /// | <code>insufficient-data</code>).</para></li><li><para><code>system-status.status</code> - The system status of the instance (<code>ok</code>
        /// | <code>impaired</code> | <code>initializing</code> | <code>insufficient-data</code>
        /// | <code>not-applicable</code>).</para></li></ul>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(Position = 1, ValueFromPipelineByPropertyName = true)]
        [Alias("Filters")]
        public Amazon.EC2.Model.Filter[] Filter { get; set; }
        #endregion
        
        #region Parameter IncludeAllInstance
        /// <summary>
        /// <para>
        /// <para>When <code>true</code>, includes the health status for all instances. When <code>false</code>,
        /// includes the health status for running instances only.</para><para>Default: <code>false</code></para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        [Alias("IncludeAllInstances")]
        public System.Boolean? IncludeAllInstance { get; set; }
        #endregion
        
        #region Parameter InstanceId
        /// <summary>
        /// <para>
        /// <para>The instance IDs.</para><para>Default: Describes all your instances.</para><para>Constraints: Maximum 100 explicitly specified instance IDs.</para>
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(Position = 0, ValueFromPipelineByPropertyName = true, ValueFromPipeline = true)]
        [Alias("InstanceIds")]
        public object[] InstanceId { get; set; }
        #endregion
        
        #region Parameter MaxResult
        /// <summary>
        /// <para>
        /// <para>The maximum number of items to return for this request. To get the next page of items,
        /// make another request with the token returned in the output. For more information,
        /// see <a href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination">Pagination</a>.</para><para>You cannot specify this parameter and the instance IDs parameter in the same request.</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","MaxResults")]
        public int? MaxResult { get; set; }
        #endregion
        
        #region Parameter NextToken
        /// <summary>
        /// <para>
        /// <para>The token returned from a previous paginated request. Pagination continues from the
        /// end of the items returned by the previous request.</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 'InstanceStatuses'.
        /// Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.EC2.Model.DescribeInstanceStatusResponse).
        /// Specifying the name of a property of type Amazon.EC2.Model.DescribeInstanceStatusResponse 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; } = "InstanceStatuses";
        #endregion
        
        #region Parameter PassThru
        /// <summary>
        /// Changes the cmdlet behavior to return the value passed to the InstanceId parameter.
        /// The -PassThru parameter is deprecated, use -Select '^InstanceId' instead. This parameter will be removed in a future version.
        /// </summary>
        [System.Obsolete("The -PassThru parameter is deprecated, use -Select '^InstanceId' 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.EC2.Model.DescribeInstanceStatusResponse, GetEC2InstanceStatusCmdlet>(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.InstanceId;
            }
            #pragma warning restore CS0618, CS0612 //A class member was marked with the Obsolete attribute
            if (this.Filter != null)
            {
                context.Filter = new List<Amazon.EC2.Model.Filter>(this.Filter);
            }
            context.IncludeAllInstance = this.IncludeAllInstance;
            if (this.InstanceId != null)
            {
                context.InstanceId = AmazonEC2Helper.InstanceParamToIDs(this.InstanceId);
            }
            
            context.MaxResult = this.MaxResult;
            #if !MODULAR
            if (ParameterWasBound(nameof(this.MaxResult)) && this.MaxResult.HasValue)
            {
                WriteWarning("AWSPowerShell and AWSPowerShell.NetCore use the MaxResult 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 MaxResult" +
                    " to the service to specify how many items should be returned by each service call.");
            }
            #endif
            context.NextToken = this.NextToken;
            
            // 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.EC2.Model.DescribeInstanceStatusRequest();
            
            if (cmdletContext.Filter != null)
            {
                request.Filters = cmdletContext.Filter;
            }
            if (cmdletContext.IncludeAllInstance != null)
            {
                request.IncludeAllInstances = cmdletContext.IncludeAllInstance.Value;
            }
            if (cmdletContext.InstanceId != null)
            {
                request.InstanceIds = cmdletContext.InstanceId;
            }
            if (cmdletContext.MaxResult != null)
            {
                request.MaxResults = AutoIterationHelpers.ConvertEmitLimitToServiceTypeInt32(cmdletContext.MaxResult.Value);
            }
            
            // 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.EC2.Model.DescribeInstanceStatusRequest();
            if (cmdletContext.Filter != null)
            {
                request.Filters = cmdletContext.Filter;
            }
            if (cmdletContext.IncludeAllInstance != null)
            {
                request.IncludeAllInstances = cmdletContext.IncludeAllInstance.Value;
            }
            if (cmdletContext.InstanceId != null)
            {
                request.InstanceIds = cmdletContext.InstanceId;
            }
            
            // 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.MaxResult.HasValue)
            {
                _emitLimit = cmdletContext.MaxResult;
            }
            var _userControllingPaging = this.NoAutoIteration.IsPresent || ParameterWasBound(nameof(this.NextToken));
            
            var client = Client ?? CreateClient(_CurrentCredentials, _RegionEndpoint);
            do
            {
                request.NextToken = _nextToken;
                if (_emitLimit.HasValue)
                {
                    request.MaxResults = AutoIterationHelpers.ConvertEmitLimitToInt32(_emitLimit.Value);
                }
                
                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.InstanceStatuses.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.EC2.Model.DescribeInstanceStatusResponse CallAWSServiceOperation(IAmazonEC2 client, Amazon.EC2.Model.DescribeInstanceStatusRequest request)
        {
            Utils.Common.WriteVerboseEndpointMessage(this, client.Config, "Amazon Elastic Compute Cloud (EC2)", "DescribeInstanceStatus");
            try
            {
                #if DESKTOP
                return client.DescribeInstanceStatus(request);
                #elif CORECLR
                return client.DescribeInstanceStatusAsync(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 List<Amazon.EC2.Model.Filter> Filter { get; set; }
            public System.Boolean? IncludeAllInstance { get; set; }
            public List<System.String> InstanceId { get; set; }
            public int? MaxResult { get; set; }
            public System.String NextToken { get; set; }
            public System.Func<Amazon.EC2.Model.DescribeInstanceStatusResponse, GetEC2InstanceStatusCmdlet, object> Select { get; set; } =
                (response, cmdlet) => response.InstanceStatuses;
        }
        
    }
}