using OpenTK;
using OpenTK.Graphics.OpenGL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Wicked.Global;
using Wicked.Shaders;
using System.Windows.Forms;

namespace Wicked.Editor
{
    public class SceneCamera
    {
        private enum MouseButton
        {
            None,
            Left,
            Right
        }

        public Matrix4 Proj;
        public Matrix4 View;

        public float MoveSpeed = 0.2f;
        public float MouseSensitivity = 0.0025f;

        private MouseButton _currentMouse = MouseButton.None;
        private Vector3 _cameraPos = Vector3.Zero;

        public SceneCamera()
        {
            Proj = Matrix4.CreatePerspectiveFieldOfView((float)MathHelper.DegreesToRadians(45.0), Links.GLControl.Width / Links.GLControl.Height, 0.1f, 100.0f);
            View = Matrix4.Identity;

            Links.GLControl.KeyDown += Engine_KeyDown;
            Links.GLControl.MouseDown += GLControl_MouseDown;
            Links.GLControl.MouseUp += GLControl_MouseUp;
        }

        private void GLControl_MouseUp(object sender, MouseEventArgs e)
        {
            _currentMouse = MouseButton.None;
        }

        private void GLControl_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                //AddRotation(OpenTK.Input.Mouse.GetState().X, OpenTK.Input.Mouse.GetState().Y);
            }
        }

        private void Engine_KeyDown(object sender, KeyEventArgs e)
        {
            switch(e.KeyCode)
            {
                case Keys.W:
                    Move(0, 0, 1);
                    break;
                case Keys.S:
                    Move(0, 0, -1);
                    break;
                case Keys.A:
                    Move(1, 0, 0);
                    break;
                case Keys.D:
                    Move(-1, 0, 0);
                    break;
                default:
                    break;
            }
        }

        public void Update()
        {
            //if (_lastMousePos != new Vector2(OpenTK.Input.Mouse.GetState().X, OpenTK.Input.Mouse.GetState().Y))
            //CheckMouse();
        }

        public void Move(float x, float y, float z)
        {
            _cameraPos += new Vector3(x,y,z) * MoveSpeed;
            View = Matrix4.LookAt(_cameraPos, _cameraPos + Vector3.UnitZ, Vector3.UnitY);
        }
    }
}