ENTITY pobudzenia_testowe IS
generic (N: natural := 2);
END pobudzenia_testowe;

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
use IEEE.std_logic_textio.all;
use STD.textio.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

ARCHITECTURE structural OF pobudzenia_testowe IS

    -- Component Declaration for the Unit Under Test (UUT)

    COMPONENT rca_nbit
     generic (N: integer);
    PORT(
         a : IN  std_logic_vector(N-1 downto 0);
         b : IN  std_logic_vector(N-1 downto 0);
         cin : IN  std_logic;
         sum : OUT  std_logic_vector(N-1 downto 0);
         cout : OUT  std_logic
        );
    END COMPONENT;


   --Inputs
   signal a : std_logic_vector(N-1 downto 0) := (others => '0');
   signal b : std_logic_vector(N-1 downto 0) := (others => '0');
   signal cin : std_logic := '0';

    --Outputs
   signal sum : std_logic_vector(N-1 downto 0);
   signal cout : std_logic;

    --zmienne przechowujące liczby, do sprawdzanie poprawności sumowania
    signal a_int : integer;
    signal b_int : integer;
    signal sum_int : integer := 0;
    signal sum_conv : integer := 0;
    signal results : integer := 0;

    signal done : std_logic := '0'; --flaga zapisu do pliku

BEGIN

    --tutaj ustawić n!!! / c++
   uut: rca_nbit generic map (N) PORT MAP (
          a => a,
          b => b,
          cin => cin,
          sum => sum,
          cout => cout
        );


    cin <= '0'; --wyzerowanie przeniesienia wejściowego

    test:
     process (a,b,sum,cout,a_int,b_int,sum_int,sum_conv, results) is
     variable size : integer := 2**(N-1);
    begin
        results <= 0;
        for i in 0 to size loop
            a_int <= i;
            a <= conv_std_logic_vector(a_int,N);
            for j in 0 to size loop
                b_int <= j;
                b <= conv_std_logic_vector(b_int,N);
                sum_int <= a_int+b_int after 5 ns;
                sum_conv <= conv_integer(sum) after 5 ns;
                if (sum_int = sum_conv) then --jeśli sprawdzanie się powiedzie
                    results <= results + 1 after 5 ns;  --to zwiększamy licznik dobrych sum
                end if;
            end loop;
        end loop;
     end process;



        --cin <= '0';
        --a <= "01010";
        --b <= "10101";

        --result <= conv_integer(a);    NIE DZIAŁA

        --write_file:
        -- process (done,a,b,sum,cout) is
        --  file my_output : TEXT open WRITE_MODE is "g:/file_io.out";
        --  variable my_line : LINE;
        --  variable my_output_line : LINE;
        -- begin
        --    done <= '1' after 5 ns;        -- opóźnienie, aby nie zapisywało 30 razy do pliku
        --    if done = '1' then
        --    write(my_output_line, string'("a = "));
        --    write(my_output_line, a);
        --    writeline(my_output, my_output_line);
        --    write(my_output_line, string'("b = "));
        --    write(my_output_line, b);
        --    writeline(my_output, my_output_line);
        --    write(my_output_line, string'("s = "));
        --    write(my_output_line, cout);
        --    write(my_output_line, sum);
        --    writeline(my_output, my_output_line);
        --    write(my_output_line, string'("ex = "));
        --    write(my_output_line, result);
        --    writeline(my_output, my_output_line);
        --    end if;
        -- end process write_file;



    --wynik <= a+b;
    --sum = wynik;


END;