using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Pingerino.Utilities
{
    public static class UIHelper
    {
        // Windows API constants and imports for form dragging
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        public static extern IntPtr CreateRoundRectRgn(
            int nLeftRect, int nTopRect, int nRightRect, int nBottomRect,
            int nWidthEllipse, int nHeightEllipse);

        /// <summary>
        /// Enables form dragging by mouse
        /// </summary>
        public static void EnableFormDragging(Form form, Control dragControl)
        {
            dragControl.MouseDown += (sender, e) =>
            {
                if (e.Button == MouseButtons.Left)
                {
                    ReleaseCapture();
                    SendMessage(form.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
                }
            };
        }

        /// <summary>
        /// Applies rounded corners to a form
        /// </summary>
        public static void ApplyRoundedCorners(Form form, int radius = 30)
        {
            form.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, form.Width, form.Height, radius, radius));
        }

        /// <summary>
        /// Safely updates UI control from any thread
        /// </summary>
        public static void SafeInvoke(Control control, Action action)
        {
            if (control == null || control.IsDisposed)
                return;

            if (control.InvokeRequired)
            {
                try
                {
                    control.Invoke(action);
                }
                catch (ObjectDisposedException)
                {
                    // Control was disposed while trying to invoke
                }
                catch (InvalidOperationException)
                {
                    // Control handle was not created or is being destroyed
                }
            }
            else
            {
                action();
            }
        }

        /// <summary>
        /// Safely updates UI control from any thread with return value
        /// </summary>
        public static T SafeInvoke<T>(Control control, Func<T> func)
        {
            if (control == null || control.IsDisposed)
                return default(T);

            if (control.InvokeRequired)
            {
                try
                {
                    return (T)control.Invoke(func);
                }
                catch (ObjectDisposedException)
                {
                    return default(T);
                }
                catch (InvalidOperationException)
                {
                    return default(T);
                }
            }
            else
            {
                return func();
            }
        }

        /// <summary>
        /// Shows an error message with consistent styling
        /// </summary>
        public static void ShowError(string message, string title = "Error")
        {
            MessageBox.Show(message, title, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        /// <summary>
        /// Shows an information message with consistent styling
        /// </summary>
        public static void ShowInformation(string message, string title = "Information")
        {
            MessageBox.Show(message, title, MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        /// <summary>
        /// Shows a confirmation dialog
        /// </summary>
        public static bool ShowConfirmation(string message, string title = "Confirm")
        {
            return MessageBox.Show(message, title, MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes;
        }

        /// <summary>
        /// Formats time span for display
        /// </summary>
        public static string FormatTimeSpan(TimeSpan timeSpan)
        {
            if (timeSpan.TotalDays >= 1)
                return $"{timeSpan.Days}d {timeSpan.Hours}h {timeSpan.Minutes}m";
            if (timeSpan.TotalHours >= 1)
                return $"{timeSpan.Hours}h {timeSpan.Minutes}m {timeSpan.Seconds}s";
            if (timeSpan.TotalMinutes >= 1)
                return $"{timeSpan.Minutes}m {timeSpan.Seconds}s";
            
            return $"{timeSpan.Seconds}.{timeSpan.Milliseconds:000}s";
        }

        /// <summary>
        /// Formats bytes for display
        /// </summary>
        public static string FormatBytes(long bytes)
        {
            string[] suffixes = { "B", "KB", "MB", "GB", "TB" };
            int counter = 0;
            decimal number = bytes;
            
            while (Math.Round(number / 1024) >= 1)
            {
                number /= 1024;
                counter++;
            }
            
            return $"{number:n1} {suffixes[counter]}";
        }
    }
}