﻿//  Copyright 2020 Google Inc. 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.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License 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.

using NtApiDotNet;
using System.Management.Automation;

namespace NtObjectManager.Cmdlets.Object
{
    /// <summary>
    /// <para type="synopsis">Creates a Desktop object by path.</para>
    /// <para type="description">This cmdlet creates a new Desktop object. The absolute path to the object in the NT object manager name space must be specified. 
    /// It's also possible to create the object relative to an existing object by specified the -Root parameter.</para>
    /// </summary>
    /// <example>
    ///   <code>$obj = New-NtDesktop \Windows\WindowStations\WinSta0\ABC</code>
    ///   <para>Create a Desktop object with an absolute path.</para>
    /// </example>
    /// <example>
    ///   <code>$root = Get-NtNtWindowStation \Windows\WindowStations\WinSta0&#x0A;$obj = New-NtDesktop ABC -Root $root</code>
    ///   <para>Create a desktop object with a relative path.
    ///   </para>
    /// </example>
    /// <example>
    ///   <code>$obj = New-NtDesktop -Path ABC -Win32Path</code>
    ///   <para>Create a desktop object from Win32 path in current Window Station.</para>
    /// </example>
    /// <para type="link">about_ManagingNtObjectLifetime</para>
    [Cmdlet(VerbsCommon.New, "NtDesktop")]
    [OutputType(typeof(NtDesktop))]
    public sealed class NewNtDesktopCmdlet : NtObjectBaseCmdletWithAccess<DesktopAccessRights>
    {
        /// <summary>
        /// <para type="description">The NT object manager path to the object to use.</para>
        /// </summary>
        [Parameter(Position = 0, Mandatory = true)]
        public override string Path { get; set; }

        /// <summary>
        /// <para type="description">The device for the desktop.</para>
        /// </summary>
        [Parameter]
        public string Device { get; set; }

        /// <summary>
        /// <para type="description">The device mode for the desktop.</para>
        /// </summary>
        [Parameter]
        public DEVMODE DeviceMode { get; set; }

        /// <summary>
        /// <para type="description">The flags for the desktop.</para>
        /// </summary>
        [Parameter]
        public CreateDesktopFlags Flags { get; set; }

        /// <summary>
        /// <para type="description">The heap size for the desktop.</para>
        /// </summary>
        [Parameter]
        public int HeapSize { get; set; }

        /// <summary>
        /// Determine if the cmdlet can create objects.
        /// </summary>
        /// <returns>True if objects can be created.</returns>
        protected override bool CanCreateDirectories()
        {
            return true;
        }

        /// <summary>
        /// Get the Win32 path for a specified path.
        /// </summary>
        /// <param name="path">The path component.</param>
        /// <returns>The full NT path.</returns>
        protected override string GetWin32Path(string path)
        {
            if (!path.Contains(@"\"))
            {
                return $@"{NtWindowStation.Current.FullPath}\{path}";
            }
            return $@"{NtWindowStation.GetWindowStationDirectory()}\{path}";
        }

        /// <summary>
        /// Method to create an object from a set of object attributes.
        /// </summary>
        /// <param name="obj_attributes">The object attributes to create/open from.</param>
        /// <returns>The newly created object.</returns>
        protected override object CreateObject(ObjectAttributes obj_attributes)
        {
            return NtDesktop.Create(obj_attributes, Device, DeviceMode, Flags, Access, HeapSize);
        }
    }
}
