// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

using System;
using System.Runtime.InteropServices;

namespace WinDynamicDesktop.COM
{
    // Code from https://stackoverflow.com/a/24187171/5504760
    public static class TaskbarProgress
    {
        public enum TaskbarStates
        {
            NoProgress = 0,
            Indeterminate = 0x1,
            Normal = 0x2,
            Error = 0x4,
            Paused = 0x8
        }

        [ComImport()]
        [Guid("ea1afb91-9e28-4b86-90e9-9e9f8a5eefaf")]
        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        private interface ITaskbarList3
        {
            // ITaskbarList
            [PreserveSig]
            void HrInit();
            [PreserveSig]
            void AddTab(IntPtr hwnd);
            [PreserveSig]
            void DeleteTab(IntPtr hwnd);
            [PreserveSig]
            void ActivateTab(IntPtr hwnd);
            [PreserveSig]
            void SetActiveAlt(IntPtr hwnd);

            // ITaskbarList2
            [PreserveSig]
            void MarkFullscreenWindow(IntPtr hwnd, [MarshalAs(UnmanagedType.Bool)] bool fFullscreen);

            // ITaskbarList3
            [PreserveSig]
            void SetProgressValue(IntPtr hwnd, UInt64 ullCompleted, UInt64 ullTotal);
            [PreserveSig]
            void SetProgressState(IntPtr hwnd, TaskbarStates state);
        }

        [ComImport()]
        [Guid("56fdf344-fd6d-11d0-958a-006097c9a090")]
        [ClassInterface(ClassInterfaceType.None)]
        private class TaskbarInstance
        {
        }

        private static ITaskbarList3 taskbarInstance = (ITaskbarList3)new TaskbarInstance();
        private static bool taskbarSupported = Environment.OSVersion.Version >= new Version(6, 1);

        public static void SetState(IntPtr windowHandle, TaskbarStates taskbarState)
        {
            if (taskbarSupported)
            {
                taskbarInstance.SetProgressState(windowHandle, taskbarState);
            }
        }

        public static void SetValue(IntPtr windowHandle, double progressValue, double progressMax)
        {
            if (taskbarSupported)
            {
                taskbarInstance.SetProgressValue(windowHandle, (ulong)progressValue, (ulong)progressMax);
            }
        }
    }
}
