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-- Company: 
-- Engineer: 
-- 
-- Create Date: 30.11.2021 10:35:30
-- Design Name: 
-- Module Name: Gene_Snake - Behavioral
-- Project Name: 
-- Target Devices: 
-- Tool Versions: 
-- Description: 
-- 
-- Dependencies: 
-- 
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
-- 
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-- a faire:
--  - faire bouger le snake
--  - ajouter une clk

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
use IEEE.NUMERIC_STD.ALL;

library ourTypes;
use ourTypes.types.all;

-- Uncomment the following library declaration if instantiating
-- any Xilinx leaf cells in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity Gene_Snake is
generic( addressSize : integer:=10);
Port ( X : in unsigned (9 downto 0);
       Y : in unsigned (8 downto 0);
       clk: in std_logic;
       reset: in std_logic;
       
       currentSnake : in pos;
       updateOrder : in std_logic;
       listRef : in unsigned(addressSize-1 downto 0);
       snakePresent : out std_logic;
       currentAddress : out unsigned(addressSize-1 downto 0);
       matAddress : out unsigned(addressSize-1 downto 0)
       );
end Gene_Snake;

architecture Behavioral of Gene_Snake is

-- D???claration des signaux
signal snakeHere: std_logic; --1 si on doit afficher le pixel 0 sinon
signal dx : signed(2 downto 0);
signal dy : signed(2 downto 0);
signal running : std_logic;

begin


-- Process de calcul d'affichage
process(X,Y,clk,reset,running,dx,dy,updateOrder,currentSnake,snakeHere)
begin
--if(updateOrder'event and updateOrder = '1') then
--    running <= '1';
--    snakeHere <= '0';
--    dx <= to_signed(-1,3);
--    dy <= to_signed(-1,3);
--end if;

--if(reset = '0') then
--    dx <= to_signed(-1,3);
--    dy <= to_signed(-1,3);
--    running <= '0';
--    snakeHere <= '0';
--elsif(clk'event and clk = '1') then
--    if(running = '1') then
--        dx <= dx + 1;
        
--        if(dx = 2) then
--            dx <= to_signed(-1,3);
--            dy <= dy + 1;
--        end if;
--    end if;
--end if;
if(clk'event and clk = '1') then
    if(currentSnake.isDefined = '1') then
        --if(X>=currentSnake.X-8 and X<=currentSnake.X+8 and Y>=currentSnake.Y-8 and Y<=currentSnake.Y+8) then
            snakeHere <= '1';
        --end if;
        else
            snakeHere <= '0';
    end if;
end if;

--if(dy = 2) then
--    dy <= to_signed(-1,3);
--    running <= '0';
--end if;
end process;

--matAddress <= resize(shift_right(to_unsigned(to_integer(Y)+to_integer(dy),9),4)*40+shift_right(to_unsigned(to_integer(X)+to_integer(dx),10),4),SNAKE_ADDRESS_SIZE); --on resize parce qu'il as décidé que le resultat faisait 18bits au lieu des 11 attendus
matAddress <= resize(shift_right(Y,4)*40+shift_right(X,4),SNAKE_ADDRESS_SIZE);

currentAddress <= listRef;

snakePresent <= snakeHere;
end Behavioral;