using System;
using System.Drawing;

// Moves active window to center of monitor, ignoring splits
// when run again (for same window) restores original position
// position is stored per window, so any number of windows may be centered and then moved back to original position
// set targetWidth to change window's width when centered (width is also restored when restoring position)
// ***
// TIP - set targetWidth to 1920 to emulate the width of a borderless FULL-HD window (very useful for ultra wides)
// ***
public static class DisplayFusionFunction
{
	public static void Run(IntPtr windowHandle)
	{
        // general config
        string scriptID = "eg_move2center";
        int targetMonitor = 0;  // ignores splits: 0 - first monitor, 1 - second monitor, (...)
        int targetWidth = 0;    // client size (i.e.: window's inner width); zero uses same width
        
        // we need an active window
        if (windowHandle == IntPtr.Zero) {
            BFS.Dialog.ShowMessageError("No active window found.");
            return;
        }
        // get an ID for window
        string windowID = BFS.Window.BuildWindowDebug(windowHandle);
        if (string.IsNullOrEmpty(windowID)) {
            BFS.Dialog.ShowMessageError("Failed to fetch a window ID.");
            return;
        }
        
        // no windowBounds stored? store them and move to center, otherwise restore previous bounds
        string storedBoundsKey = scriptID + "_stored_window_" + windowID;
        string storedBounds = BFS.ScriptSettings.ReadValue(storedBoundsKey);
        RectangleConverter rectConverter = new RectangleConverter();
        
        // move to center and store original bounds
        if (string.IsNullOrEmpty(storedBounds)) {
            Rectangle[] monitorBounds = BFS.Monitor.GetMonitorBoundsNoSplits();
            Rectangle windowBounds = BFS.Window.GetBounds(windowHandle);
            int primaryMonitorCenter = monitorBounds[targetMonitor].Width / 2;
            if (targetWidth > 0) {
                // let's get cient (inner) width, so that borders and/or paddings are added
                Rectangle clientBounds = BFS.Window.GetClientRect(windowHandle);
                targetWidth += (windowBounds.Width - clientBounds.Width);
            }
            int windowWidth = (targetWidth > 0) ? targetWidth : windowBounds.Width;
            bool windowMoved = BFS.Window.SetSizeAndLocation(windowHandle, primaryMonitorCenter - (windowWidth / 2), windowBounds.Top, windowWidth, windowBounds.Height);
            if (windowMoved) {
                // save original bounds to allow restoring original size and position
                BFS.ScriptSettings.WriteValue(storedBoundsKey, rectConverter.ConvertToString(windowBounds));
            }
        // restore original bounds
        } else {
            Rectangle windowBounds = (Rectangle)rectConverter.ConvertFromString(storedBounds);
            bool windowMoved = BFS.Window.SetSizeAndLocation(windowHandle, windowBounds.Left, windowBounds.Top, windowBounds.Width, windowBounds.Height);
            if (windowMoved) {
                // reset storedBounds
                BFS.ScriptSettings.WriteValue(storedBoundsKey, "");
            }
        }
	}
}