#region Copyright
/*
* Copyright © 2014-2016 NetApp, Inc. All Rights Reserved.
*
* CONFIDENTIALITY NOTICE: THIS SOFTWARE CONTAINS CONFIDENTIAL INFORMATION OF
* NETAPP, INC. USE, DISCLOSURE OR REPRODUCTION IS PROHIBITED WITHOUT THE PRIOR
* EXPRESS WRITTEN PERMISSION OF NETAPP, INC.
*/
#endregion

#region Using Directives

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Management.Automation;
using SolidFire.Core.Helpers;
using SolidFire.Core.Objects;
using SolidFire.Core.Validation;
using SolidFire.Core;
using SolidFire.Element.Api;

#endregion

namespace SolidFire.Volume.Get
{
    /// <summary>
    /// Cmdlet implementation to return information about the volume access groups for a cluster. 
    /// </summary>

    [Cmdlet(VerbsCommon.Get, "SFVolumeAccessGroup", DefaultParameterSetName = "VolumeAccessGroupId")]
    public class GetSFVolumeAccessGroup : SFCmdlet
    {
        #region Private Data

        /// <summary>
        /// Member to hold the list of volume access group id's for the cmdlet assigned before processing.
        /// </summary>
        private Int64[] volumeAccessGroupId;

        /// <summary>
        /// Member to hold the list of volume access group name's for the cmdlet assigned before processing.
        /// /// </summary>
        private string[] name;

        #endregion

        #region Parameters

        /// <summary>
        /// List of id's used to find specific access groups by id.
        /// </summary>
        [Parameter(Position = 0, ParameterSetName = "VolumeAccessGroupId", Mandatory = false, ValueFromPipeline = true,
            ValueFromPipelineByPropertyName = true, ValueFromRemainingArguments = false,
            HelpMessage = "Please enter a volume access group ID or list of volume access group IDs")]
        [ValidateNotNullOrEmpty]
        [ValidatePattern(SolidFireValidations.Numeric)]
        public Int64[] VolumeAccessGroupID
        {
            get { return volumeAccessGroupId; }
            set { volumeAccessGroupId = value; }
        }

        /// <summary>
        /// List of strings used to find specific access groups by name.
        /// </summary>
        [Parameter(Position = 0, ParameterSetName = "VolumeAccessGroupName", Mandatory = false, ValueFromPipeline = true,
            ValueFromPipelineByPropertyName = true, ValueFromRemainingArguments = false,
            HelpMessage = "Please enter a volume name or list of volume names")]
        [ValidateNotNullOrEmpty]
        [ValidatePattern(SolidFireValidations.UpperAndLowerCaseAndNumeric)]
        public String[] Name
        {
            get { return name; }
            set { name = value; }
        }

        #endregion

        #region Cmdlet Overrides

        /// <summary>
        /// Implementation of CmdLet BeginProcessing to check that a connection has been made before allowing
        /// the cmdlet processing to continue.
        /// </summary>
        protected override void BeginProcessing()
        {
            base.BeginProcessing();
            CheckConnection();
        }

        /// <summary>
        /// Implementation of CmdLet ProcessRecord to find volume access groups for the different parameter sets.
        /// </summary>
        protected override void ProcessRecord()
        {
            base.ProcessRecord();
            var request = new ListVolumeAccessGroupsRequest();
            var objsFromAPI = SendRequest<ListVolumeAccessGroupsResult>("ListVolumeAccessGroups", request);

            foreach (var obj in objsFromAPI)
            {
                switch (ParameterSetName)
                {
                    case "VolumeAccessGroupId":
                        ProcessByVolumeAccessGroupId(obj);
                        break;

                    case "VolumeAccessGroupName":
                        ProcessByName(obj);
                        break;

                    default:
                        throw new ArgumentException("Invalid parameter set.");
                }
            }
        }

        /// <summary>
        /// Finds all or specific volume access groups by volume access group name, including wildcard support.
        /// </summary>
        /// <param name="objFromApi">List of all volume access groups</param>
        private void ProcessByName(SFWrapper<ListVolumeAccessGroupsResult> objFromApi)
        {
            const WildcardOptions options = WildcardOptions.IgnoreCase |
                                            WildcardOptions.Compiled;

            var vagInfoObjects = new List<VolumeAccessGroup>();

            foreach (var grpName in name)
            {

                var wildcard = new WildcardPattern(grpName, options);
                var foundNodes =
                    objFromApi.Result.VolumeAccessGroups.Where(r => (wildcard.IsMatch(r.Name)))
                        .ToList<VolumeAccessGroup>();
                vagInfoObjects.AddRange(foundNodes);

            }

            if (vagInfoObjects.Count > 0)
            {
                WriteObject(vagInfoObjects.Distinct(), true);
            }
        }

        /// <summary>
        /// Finds all or specific volume access groups by volume access group id.
        /// </summary>
        /// <param name="objFromApi">List of all volume access groups</param>
        private void ProcessByVolumeAccessGroupId(SFWrapper<ListVolumeAccessGroupsResult> objFromApi)
        {
            // If there were no parameter arguments sent in for the Name parameter then we just want to list all volumes.
            if (volumeAccessGroupId == null)
            {
                WriteObject(objFromApi.Result.VolumeAccessGroups, true);
                return;
            }

            foreach (var id in volumeAccessGroupId)
            {
                var sfVolumeAccessGroupInfo =
                    objFromApi.Result.VolumeAccessGroups.FirstOrDefault(r => r.VolumeAccessGroupID == id);
                WriteObject(sfVolumeAccessGroupInfo);

            }
        }

        #endregion
    }
}