using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.SimulateTouch.UI.Native;

namespace Tango.SimulateTouch.UI
{
    public static class TouchController
    {
        private static bool _initialized;
        private static PointerTouchInfo? _currentContact;

        public static void Init()
        {
            if (!_initialized)
            {
                _initialized = true;
                TouchInjector.InitializeTouchInjection();
            }
        }

        public static void TouchDown(int x, int y)
        {
            Init();

            var contact = MakePointerTouchInfo(x, y, 1);
            PointerFlags oFlags = PointerFlags.DOWN | PointerFlags.INRANGE | PointerFlags.INCONTACT;
            contact.PointerInfo.PointerFlags = oFlags;
            bool bIsSuccess = TouchInjector.InjectTouchInput(1, new[] { contact });
            _currentContact = contact;
        }

        public static void TouchUp()
        {
            Init();

            if (_currentContact != null)
            {
                var contact = _currentContact.Value;
                contact.PointerInfo.PointerFlags = PointerFlags.UP;
                TouchInjector.InjectTouchInput(1, new[] { contact });
                _currentContact = null;
            }
        }

        public static void TouchMove(int deltaX, int deltaY)
        {
            Init();

            if (_currentContact != null)
            {
                var contact = _currentContact.Value;
                contact.Move(deltaX, deltaY);
                var oFlags = PointerFlags.INRANGE | PointerFlags.INCONTACT | PointerFlags.UPDATE;
                contact.PointerInfo.PointerFlags = oFlags;
                TouchInjector.InjectTouchInput(1, new[] { contact });
            }
        }

        private static PointerTouchInfo MakePointerTouchInfo(int x, int y, int radius, uint orientation = 90, uint pressure = 32000)
        {
            PointerTouchInfo contact = new PointerTouchInfo();
            contact.PointerInfo.pointerType = PointerInputType.TOUCH;
            contact.TouchFlags = TouchFlags.NONE;
            contact.Orientation = orientation;
            contact.Pressure = pressure;
            contact.TouchMasks = TouchMask.CONTACTAREA | TouchMask.ORIENTATION | TouchMask.PRESSURE;
            contact.PointerInfo.PtPixelLocation.X = x;
            contact.PointerInfo.PtPixelLocation.Y = y;
            uint unPointerId = IdGenerator.GetUinqueUInt();
            contact.PointerInfo.PointerId = unPointerId;
            contact.ContactArea.left = x - radius;
            contact.ContactArea.right = x + radius;
            contact.ContactArea.top = y - radius;
            contact.ContactArea.bottom = y + radius;
            return contact;
        }
    }
}