using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Input;

namespace animation
{
    public partial class PlayerSprite : PictureBox
    {
        // constants controlling movement characteristics
        private static double SPEED = 1.0;
        private static double INITIAL_JUMP_SPEED = -3.0;

        // need variables to keep track of movement state
        private double velocityY = 0;

        // these properties make much more sense to have here on the playersprite than on the form
        public bool CmdLeft { get; set; }
        public bool CmdRight { get; set; }
        public bool CmdJump { get; set; }

        public PlayerSprite()
        {
            InitializeComponent();
            CmdRight = false;
            CmdLeft = false;
            CmdJump = false;
        }

        public void UpdateBehavior(Form1 form)
        {
            // get the current position to work with (could be a Vector2)
            int x, y;
            x = Location.X;
            y = Location.Y;

            // simple handling of left-right movement to start
            // in this version, you can still control horizontal movement in the air (not good)
            if (CmdLeft) {
                x = x - (int)(SPEED * Form1.FRAME_TIME);
            }
            if (CmdRight) {
                x = x + (int)(SPEED * Form1.FRAME_TIME);
            }

            // simple handling of jump - should update to keep a grounded variable
            // in this version, holding space makes you keep going up (not good)
            if (CmdJump) {
                // give instantaneous upward velocity
                velocityY = INITIAL_JUMP_SPEED;
            }
            
            // check for landing (at or below ground, and moving downwards)
            if (y >= 400 && velocityY > 0) {
                y = 400;
                velocityY = 0;
            } 
            // check for in the air
            else if (y < 400) {
                // update vertical velocity according to gravity
                velocityY = velocityY + (Form1.ACCEL_GRAVITY * Form1.FRAME_TIME);
            }

            // update vertical position
            y = y + (int)(velocityY * Form1.FRAME_TIME);

            // update the position of the sprite
            Location = new Point(x, y);
        }

    }
}