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;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        private bool moveup = false;
        private bool movedown = false;
        private bool moveleft = false;
        private bool moveright = false;

        private const double a = 4;
        private double tx = 0;
        private double ty = 0;
        private int startingVelocityX;
        private int startingVelocityY;
        private int velocityX;
        private int velocityY;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if(e.KeyCode == Keys.W)
            {
                moveup = true;
            }
             if(e.KeyCode == Keys.S)
            {
                movedown = true;
            }
             if (e.KeyCode == Keys.D)
            {
                moveright = true;
            }
             if (e.KeyCode == Keys.A)
            {
                moveleft = true;
            }
             if(e.KeyCode == Keys.Space)
            {
                Rectangle c = new Rectangle(ball.Bounds.X - 3, ball.Bounds.Y - 3, ball.Bounds.Width + 6, ball.Bounds.Height + 6);
                if (c.IntersectsWith(player.Bounds) && !timer2.Enabled)
                {
                    tx = 0;
                    ty = 0;
                    startingVelocityX = (ball.Location.X + ball.Width / 2) - (player.Location.X + player.Width / 2);
                    startingVelocityY = (ball.Location.Y + player.Height / 2) - (player.Location.Y + player.Height / 2);
                    velocityX = startingVelocityX;
                    velocityY = startingVelocityY;
                    timer2.Enabled = true;
                    timer3.Enabled = true;
                }
            }

        }

        private void Form1_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.W)
            {
                moveup = false;
            }
             if (e.KeyCode == Keys.S)
            {
                movedown = false;
            }
             if (e.KeyCode == Keys.D)
            {
                moveright = false;
            }
             if (e.KeyCode == Keys.A)
            {
                moveleft = false;
            }

        }

        private void timer1_Tick(object sender, EventArgs e) // player movement
        {
            if(moveup)
            {
                if(player.Location.Y - 3 + player.Height * 9 / 10 >= 0 && ( moveBallUpAndDown(false) || player.Location.Y < ball.Location.Y))  // you can move up if you dont touch
                                                                                                                                               // the upper wall and you dont push the
                                                                                                                                               // ball to the upper wall (if
                                                                                                                                               // MoveBallUpAndDown returned True because
                                                                                                                                               // of the wall BELOW you, YOU CAN STILL
                                                                                                                                               // MOVE UP - thats what the || checks )
                    setPlayerY(player.Location.Y - 3);
            }
            else if(movedown)
            {
                if(player.Location.Y + player.Height / 10 + 3 <= panel1.Height && ( moveBallUpAndDown(false) || player.Location.Y > ball.Location.Y)) // wall or ball-wall below you
                    setPlayerY(player.Location.Y + 3);
            }
            if(moveright)
            {
                if(player.Location.X + player.Width / 10 + 3 <= panel1.Width && (moveBallLeftAndRight(false) || player.Location.X > ball.Location.X)) // wall or ball-wall to your right
                    setPlayerX(player.Location.X + 3);
            }
            else if(moveleft)
            {
                if(player.Location.X - 3 + player.Width * 9 / 10 >= 0 &&  (moveBallLeftAndRight(false) || player.Location.X < ball.Location.X)) // wall or ball-wall to your left
                    setPlayerX(player.Location.X - 3);
            }

            if (moveright || moveleft)
                moveBallLeftAndRight(true);
            if (moveup || movedown)
                moveBallUpAndDown(true);

        }

        private void setPlayerY(int y)
        {
            var loc = player.Location;
            loc.Y = y;
            player.Location = loc;

        }

        private void setPlayerX(int x)
        {
            var loc = player.Location;
            loc.X = x;
            player.Location = loc;
        }

        private void setBallX(int x)
        {
            var loc = ball.Location;
            loc.X = x;
            ball.Location = loc;
        }

        private void setBallY(int y)
        {
            var loc = ball.Location;
            loc.Y = y;
            ball.Location = loc;
        }

        private bool moveBallLeftAndRight(bool moveball) // player drag ball left and right
        {
            Rectangle playerFixed = new Rectangle(player.Location.X + 3, player.Location.Y + 6, player.Width - 6, player.Height - 12);
            Rectangle ballFixed = new Rectangle(ball.Location.X, ball.Location.Y, ball.Width, ball.Height);
            if (!playerFixed.IntersectsWith(ballFixed))
                return true;

            int movementX = ball.Location.X + ((ball.Location.X + ball.Width / 2) - (player.Location.X + player.Width / 2)) / 5;
            if (movementX >= 0 && ball.Width + movementX <= panel1.Width)
            {
                if(moveball)
                    setBallX(movementX);
                return true;
            }
            return false;
        }

        private bool moveBallUpAndDown(bool moveball) // player drag ball up and down
        {
            Rectangle playerFixed = new Rectangle(player.Location.X + 3, player.Location.Y + 6, player.Width - 6, player.Height - 12);
            Rectangle ballFixed = new Rectangle(ball.Location.X, ball.Location.Y, ball.Width, ball.Height);
            if (!playerFixed.IntersectsWith(ballFixed))
                return true;

            int movementY = ball.Location.Y + ((ball.Location.Y + player.Height / 2) - (player.Location.Y + player.Height / 2)) / 5;
            if (movementY >= 0 && movementY + ball.Height <= panel1.Height)
            {
                if(moveball)
                    setBallY(movementY);
                return true;
            }
            return false;
        }

        private void timer2_Tick(object sender, EventArgs e) // the X part of the ball shoot
        {
            tx += 0.2;
            if(startingVelocityX > 0)
                velocityX = startingVelocityX - (int)(a * tx);
            else if (startingVelocityX < 0)
                velocityX = startingVelocityX + (int)(a * tx);

            if ((ball.Location.X + ball.Width + velocityX / 5 > panel1.Width || ball.Location.X + velocityX / 5 < 0) || (ball.Bounds.IntersectsWith(player.Bounds) && tx >= 1)) // ball touch wall or player
            {
                startingVelocityX *= -1;
                velocityX *= -1;
            }

            setBallX(ball.Location.X + velocityX / 5);
            if (( (startingVelocityX > 0 && velocityX <= 0) || (startingVelocityX < 0 && velocityX >= 0) || startingVelocityX == 0))
                timer2.Enabled = false;

        }

        private void timer3_Tick(object sender, EventArgs e) // the y part of the ball shoot
        {
            ty += 0.2;
            if (startingVelocityY > 0)
                velocityY = startingVelocityY - (int)(a * ty);
            else if (startingVelocityY < 0)
                velocityY = startingVelocityY + (int)(a * ty);

            if ((ball.Location.Y + ball.Height + velocityY / 5 > panel1.Height || ball.Location.Y + velocityY / 5 < 0) || (ball.Bounds.IntersectsWith(player.Bounds) && ty >= 1)) // ball touch wall or player
            {
                startingVelocityY *= -1;
                velocityY *= -1;
            }


            setBallY(ball.Location.Y + velocityY / 5);
            if (((startingVelocityY > 0 && velocityY <= 0) || (startingVelocityY < 0 && velocityY >= 0) || startingVelocityY == 0))
                timer3.Enabled = false;
        }

    }
}