using WPFluent.Interop;

namespace WPFluent.Taskbar;

/// <summary>
/// Allows to change the status of the displayed notification in the application icon on the TaskBar.
/// </summary>
public static class TaskBarProgress
{
    /// <summary>
    /// Gets a value indicating whether the current operating system supports task bar manipulation.
    /// </summary>
    private static bool IsSupported() { return Win32.Utilities.IsOSWindows7OrNewer; }

    /// <summary>
    /// Allows to change the status of the progress bar in the task bar.
    /// </summary>
    /// <param name="window">Window to manipulate.</param>
    /// <param name="taskBarProgressState">State of the progress indicator.</param>
    public static bool SetState(Window? window, TaskBarProgressState taskBarProgressState)
    {
        if(window is null)
        {
            return false;
        }

        if(window.IsLoaded)
        {
            return SetState(new WindowInteropHelper(window).Handle, taskBarProgressState);
        }

        window.Loaded += (_, _) =>
        {
            _ = SetState(new WindowInteropHelper(window).Handle, taskBarProgressState);
        };

        return true;
    }

    /// <summary>
    /// Allows to change the status of the progress bar in the task bar.
    /// </summary>
    /// <param name="hWnd">Window handle.</param>
    /// <param name="taskBarProgressState">State of the progress indicator.</param>
    public static bool SetState(IntPtr hWnd, TaskBarProgressState taskBarProgressState)
    {
        if(!IsSupported())
        {
            throw new Exception("Taskbar functions not available.");
        }

        return UnsafeNativeMethods.SetTaskbarState(hWnd, UnsafeReflection.Cast(taskBarProgressState));
    }

    /// <summary>
    /// Allows to change the fill of the task bar.
    /// </summary>
    /// <param name="window">Window to manipulate.</param>
    /// <param name="taskBarProgressState">Progress sate to set.</param>
    /// <param name="current">Current value to display</param>
    public static bool SetValue(Window window, TaskBarProgressState taskBarProgressState, int current)
    {
        if(current > 100)
        {
            current = 100;
        }

        if(current < 0)
        {
            current = 0;
        }

        return SetValue(window, taskBarProgressState, current, 100);
    }

    /// <summary>
    /// Allows to change the fill of the task bar.
    /// </summary>
    /// <param name="hWnd">Window handle.</param>
    /// <param name="taskBarProgressState">Progress sate to set.</param>
    /// <param name="current">Current value to display</param>
    public static bool SetValue(IntPtr hWnd, TaskBarProgressState taskBarProgressState, int current)
    {
        if(current > 100)
        {
            current = 100;
        }

        if(current < 0)
        {
            current = 0;
        }

        return SetValue(hWnd, taskBarProgressState, current, 100);
    }

    /// <summary>
    /// Allows to change the fill of the task bar.
    /// </summary>
    /// <param name="window">Window to manipulate.</param>
    /// <param name="taskBarProgressState">Progress sate to set.</param>
    /// <param name="current">Current value to display</param>
    /// <param name="total">Total number for division.</param>
    public static bool SetValue(Window? window, TaskBarProgressState taskBarProgressState, int current, int total)
    {
        if(window is null)
        {
            return false;
        }

        if(window.IsLoaded)
        {
            return SetValue(new WindowInteropHelper(window).Handle, taskBarProgressState, current, total);
        }

        window.Loaded += (_, _) =>
        {
            _ = SetValue(new WindowInteropHelper(window).Handle, taskBarProgressState, current, total);
        };

        return false;
    }

    /// <summary>
    /// Allows to change the fill of the task bar.
    /// </summary>
    /// <param name="hWnd">Window handle.</param>
    /// <param name="taskBarProgressState">Progress sate to set.</param>
    /// <param name="current">Current value to display</param>
    /// <param name="total">Total number for division.</param>
    public static bool SetValue(IntPtr hWnd, TaskBarProgressState taskBarProgressState, int current, int total)
    {
        if(!IsSupported())
        {
            throw new Exception("Taskbar functions not available.");
        }

        return UnsafeNativeMethods.SetTaskbarValue(hWnd, UnsafeReflection.Cast(taskBarProgressState), current, total);
    }
}