/*******************************************************************************
 *  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.S3;
using Amazon.S3.Model;

namespace Amazon.PowerShell.Cmdlets.S3
{
    /// <summary>
    /// Returns the policy of a specified bucket. If you are using an identity other than
    /// the root user of the Amazon Web Services account that owns the bucket, the calling
    /// identity must have the <code>GetBucketPolicy</code> permissions on the specified bucket
    /// and belong to the bucket owner's account in order to use this operation.
    /// 
    ///  
    /// <para>
    /// If you don't have <code>GetBucketPolicy</code> permissions, Amazon S3 returns a <code>403
    /// Access Denied</code> error. If you have the correct permissions, but you're not using
    /// an identity that belongs to the bucket owner's account, Amazon S3 returns a <code>405
    /// Method Not Allowed</code> error.
    /// </para><important><para>
    /// To ensure that bucket owners don't inadvertently lock themselves out of their own
    /// buckets, the root principal in a bucket owner's Amazon Web Services account can perform
    /// the <code>GetBucketPolicy</code>, <code>PutBucketPolicy</code>, and <code>DeleteBucketPolicy</code>
    /// API actions, even if their bucket policy explicitly denies the root principal's access.
    /// Bucket owner root principals can only be blocked from performing these API actions
    /// by VPC endpoint policies and Amazon Web Services Organizations policies.
    /// </para></important><para>
    /// To use this API operation against an access point, provide the alias of the access
    /// point in place of the bucket name.
    /// </para><para>
    /// To use this API operation against an Object Lambda access point, provide the alias
    /// of the Object Lambda access point in place of the bucket name. If the Object Lambda
    /// access point alias in a request is not valid, the error code <code>InvalidAccessPointAliasError</code>
    /// is returned. For more information about <code>InvalidAccessPointAliasError</code>,
    /// see <a href="https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList">List
    /// of Error Codes</a>.
    /// </para><para>
    /// For more information about bucket policies, see <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/using-iam-policies.html">Using
    /// Bucket Policies and User Policies</a>.
    /// </para><para>
    /// The following action is related to <code>GetBucketPolicy</code>:
    /// </para><ul><li><para><a href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html">GetObject</a></para></li></ul>
    /// </summary>
    [Cmdlet("Get", "S3BucketPolicy")]
    [OutputType("System.String")]
    [AWSCmdlet("Calls the Amazon Simple Storage Service (S3) GetBucketPolicy API operation.", Operation = new[] {"GetBucketPolicy"}, SelectReturnType = typeof(Amazon.S3.Model.GetBucketPolicyResponse))]
    [AWSCmdletOutput("System.String or Amazon.S3.Model.GetBucketPolicyResponse",
        "This cmdlet returns a System.String object.",
        "The service call response (type Amazon.S3.Model.GetBucketPolicyResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack."
    )]
    public partial class GetS3BucketPolicyCmdlet : AmazonS3ClientCmdlet, IExecutor
    {
        
        #region Parameter BucketName
        /// <summary>
        /// <para>
        /// The name of the bucket.
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(Position = 0, ValueFromPipelineByPropertyName = true, ValueFromPipeline = true)]
        public System.String BucketName { get; set; }
        #endregion
        
        #region Parameter ExpectedBucketOwner
        /// <summary>
        /// <para>
        /// The account ID of the expected bucket owner. 
        /// If the bucket is owned by a different account, the request will fail with an HTTP 403 (Access Denied) error.
        /// </para>
        /// </summary>
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public System.String ExpectedBucketOwner { get; set; }
        #endregion
        
        #region Parameter Select
        /// <summary>
        /// Use the -Select parameter to control the cmdlet output. The default value is 'Policy'.
        /// Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.S3.Model.GetBucketPolicyResponse).
        /// Specifying the name of a property of type Amazon.S3.Model.GetBucketPolicyResponse 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; } = "Policy";
        #endregion
        
        #region Parameter PassThru
        /// <summary>
        /// Changes the cmdlet behavior to return the value passed to the BucketName parameter.
        /// The -PassThru parameter is deprecated, use -Select '^BucketName' instead. This parameter will be removed in a future version.
        /// </summary>
        [System.Obsolete("The -PassThru parameter is deprecated, use -Select '^BucketName' instead. This parameter will be removed in a future version.")]
        [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]
        public SwitchParameter PassThru { get; set; }
        #endregion
        
        protected override void ProcessRecord()
        {
            this._AWSSignerType = "s3";
            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.S3.Model.GetBucketPolicyResponse, GetS3BucketPolicyCmdlet>(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.BucketName;
            }
            #pragma warning restore CS0618, CS0612 //A class member was marked with the Obsolete attribute
            context.BucketName = this.BucketName;
            context.ExpectedBucketOwner = this.ExpectedBucketOwner;
            
            // allow further manipulation of loaded context prior to processing
            PostExecutionContextLoad(context);
            
            var output = Execute(context) as CmdletOutput;
            ProcessOutput(output);
        }
        
        #region IExecutor Members
        
        public object Execute(ExecutorContext context)
        {
            var cmdletContext = context as CmdletContext;
            // create request
            var request = new Amazon.S3.Model.GetBucketPolicyRequest();
            
            if (cmdletContext.BucketName != null)
            {
                request.BucketName = cmdletContext.BucketName;
            }
            if (cmdletContext.ExpectedBucketOwner != null)
            {
                request.ExpectedBucketOwner = cmdletContext.ExpectedBucketOwner;
            }
            
            CmdletOutput output;
            
            // issue call
            var client = Client ?? CreateClient(_CurrentCredentials, _RegionEndpoint);
            try
            {
                var response = CallAWSServiceOperation(client, request);
                object pipelineOutput = null;
                pipelineOutput = cmdletContext.Select(response, this);
                output = new CmdletOutput
                {
                    PipelineOutput = pipelineOutput,
                    ServiceResponse = response
                };
            }
            catch (Exception e)
            {
                output = new CmdletOutput { ErrorResponse = e };
            }
            
            return output;
        }
        
        public ExecutorContext CreateContext()
        {
            return new CmdletContext();
        }
        
        #endregion
        
        #region AWS Service Operation Call
        
        private Amazon.S3.Model.GetBucketPolicyResponse CallAWSServiceOperation(IAmazonS3 client, Amazon.S3.Model.GetBucketPolicyRequest request)
        {
            Utils.Common.WriteVerboseEndpointMessage(this, client.Config, "Amazon Simple Storage Service (S3)", "GetBucketPolicy");
            try
            {
                #if DESKTOP
                return client.GetBucketPolicy(request);
                #elif CORECLR
                return client.GetBucketPolicyAsync(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 BucketName { get; set; }
            public System.String ExpectedBucketOwner { get; set; }
            public System.Func<Amazon.S3.Model.GetBucketPolicyResponse, GetS3BucketPolicyCmdlet, object> Select { get; set; } =
                (response, cmdlet) => response.Policy;
        }
        
    }
}