Block_Decisions.sv

module  Block_Decisions ( input Reset, decis_clk, ResetShape, reset_game, stop_x_left, stop_x_right,
									input [1:0] gamestate,
									input [13:0] Score,
									input [2:0] keypress,
									input [9:0] shape_size_x, shape_size_y,
									output [9:0] Block_X_Pos_out, Block_Y_Pos_out,
									output       touchdown);
    
    logic [9:0] Block_X_Pos, Block_Y_Pos;
	 logic [9:0] Block_X_Motion;
	 logic [9:0] Block_Y_Motion;
	 
    parameter [9:0] Block_X_Min= 250;      // Leftmost point on the X axis
    parameter [9:0] Block_X_Max= 410;     // Rightmost point on the X axis
    parameter [9:0] Block_Y_Min= 100;       // Topmost point on the Y axis
    parameter [9:0] Block_Y_Max= 420;     // Bottommost point on the Y axis
    parameter [9:0] x_start = 298;
    parameter [9:0] y_start = 100;
    parameter [9:0] Block_X_Step = 16;  // Step size on the X axis
    parameter [9:0] Block_Y_Step = 16;	// Step size on the Y axis             
	logic [27:0] counter_y, speed_y;
	logic [27:0] counter_x;
	logic act_once_x, act_once_y, accel, accel_spac;
	 
	always_ff @ (posedge Reset or posedge decis_clk)
	begin // Move Decisions
				if (Reset)  // Asynchronous Reset
					begin 
					Block_X_Motion <= 0;
					Block_Y_Motion <= Block_Y_Step;
					Block_X_Pos <= x_start;
					Block_Y_Pos <= y_start;
					counter_y <= 0;
					counter_x <= 0;
					accel <= 0;
					accel_spac <= 0;
					act_once_x <= 0;
					act_once_y <= 0;
					end
					
				else
					begin
						if (reset_game)
							begin
							Block_X_Motion <= 0;
							Block_Y_Motion <= Block_Y_Step;
							Block_X_Pos <= x_start;
							Block_Y_Pos <= y_start;
							act_once_x <= 0;
							act_once_y <= 0;
							counter_x <= 0;
							counter_y <= 0;
							accel <= 0;
							accel_spac <= 0;
							end
					
					if (gamestate == 2'd2)
						begin
						
						if      (Score >= 14'd25)
							begin
							speed_y <= 28'h04fffff;
							end
						
						else if (Score >= 14'd20)
							begin
							speed_y <= 28'h06fffff;
							end
							
						else if (Score >= 14'd15)
							begin
							speed_y <= 28'h08fffff;
							end
						
						else if (Score >= 14'd10)
							begin
							speed_y <= 28'h09fffff;
							end
						
						else if (Score >= 14'd5)
							begin
							speed_y <= 28'h0Afffff;
							end
						
						else
							speed_y <= 28'h1ffffff;
			
			
						if (touchdown||ResetShape)
							begin
							Block_X_Motion <= 0;
							Block_Y_Motion <= Block_Y_Step;
							Block_X_Pos <= x_start;
							Block_Y_Pos <= y_start;
							act_once_x <= 0;
							act_once_y <= 0;
							counter_x <= 0;
							counter_y <= 0;
							accel <= 0;
							end
										
						//Command On Key Press
						if  ((keypress == 3'd1) && ((Block_X_Pos) > (Block_X_Min)) && (~act_once_x)) //'a' is pressed
							begin
							Block_X_Motion <= (~ (Block_X_Step) + 1'b1);
							act_once_x <= 1'b1;
							end
						
						else if ((keypress == 3'd2) && ((Block_X_Pos + shape_size_x) < Block_X_Max) && (~act_once_x)) //'d' is pressed
							begin
							Block_X_Motion <= Block_X_Step;
							act_once_x <= 1'b1;
							end
						
						else if ((keypress == 3'd3) && ((Block_Y_Pos + shape_size_y) < Block_Y_Max) && (~act_once_y)) //'s' is pressed
							begin
							accel <= 1'b1;
							act_once_y <= 1'b1;
							end
							
					   else if ((keypress == 3'd4) && ~(accel_spac)) // Space bar is pressed
							begin
							//Block_Y_Pos <= (Block_Y_Pos + Block_Y_Motion);
							accel_spac <= 1'b1;
							end
							
						// X MOTION BOUNDARIES
						else if ((((Block_X_Pos + shape_size_x) >= Block_X_Max) && (~act_once_x) && (Block_X_Motion > 0) ) || stop_x_right)  // Block is at the right edge, Stop.
								begin
								act_once_x <= 1'b1;
								Block_X_Motion <= 10'd0;
								end
						else if ((((Block_X_Pos) <= (Block_X_Min)) && (~act_once_x) && (Block_X_Motion < 0)) || stop_x_left)  // Block is at the left edge, Stop.
							  begin
							  act_once_x <= 1'b1;
							  Block_X_Motion <= 10'd0;
							  end
						
						else if ((~act_once_x)&&(~keypress)&&(Block_X_Motion))
							begin
							Block_X_Motion <= 0;
							end						
							
					
						// Y MOTION BOUNDARIES
						if ((Block_Y_Pos) <= (Block_Y_Min))  // Block is at Top Edge, move down
							  Block_Y_Motion <=  Block_Y_Step;
						else if ((Block_Y_Pos + shape_size_y) >= Block_Y_Max + Block_Y_Step)  // Block is at the bottom edge, Stop.
							  begin
							  Block_Y_Motion <= 10'd0;
							  Block_X_Motion <= 10'd0;
							  end
	
						//Update Movement Y DIRECTION
						if ((counter_y == 28'h0000fff) && (accel_spac))
							begin
							if (~ResetShape)
									Block_Y_Pos <= (Block_Y_Pos + Block_Y_Motion);
							else
								begin
									counter_y <= 0;
									accel_spac <= 0;
								end
							end
						
						else if ((counter_y == 28'h03fffff) && (accel))
							begin
							Block_Y_Pos <= (Block_Y_Pos + Block_Y_Motion);
							counter_y <= 0;
							act_once_y <= 0;
							accel <= 0;
							end
						
						else if (counter_y == speed_y)
							begin
							Block_Y_Pos <= (Block_Y_Pos + Block_Y_Motion);
							counter_y <= 0;
							end
						else
							counter_y <= counter_y + 1;

						//Update Movement X DIRECTION
						if (Block_X_Pos + shape_size_x > Block_X_Max)
							begin
							Block_X_Pos <= (Block_X_Max - shape_size_x);
							end
						
						else if ((counter_x == 28'h00fffff) && (act_once_x))
							begin
							Block_X_Pos <= (Block_X_Pos + Block_X_Motion);
							act_once_x <= 0;
							counter_x <= 0;
							end
						else if (act_once_x)
							counter_x <= counter_x + 1;
							
						
						//Touchdown Check
						if (Block_Y_Motion == 10'd0)
							begin
							touchdown <= 1'b1;
							accel_spac <= 1'b0;
							end
						else
							touchdown <= 1'b0;
					end
				end
end

	assign Block_X_Pos_out = Block_X_Pos;
	assign Block_Y_Pos_out = Block_Y_Pos;

endmodule