DW4 - kill single metal script

--This script is designed to work with Bizhawk
--This script assumes a pre-made state on Quicksave Slot 0, with 1 Metal slime

--Set the correct memory domain
memory.usememorydomain("System Bus")

--define variables
wins = 0
runs = 0
para = 0
total = 0
save_state_slot = 0 -- which quickload slot to load from
rng1 = 0
rng2 = 0
rng3 = 0

--Wait function for advancing 1 frame and displaying results on the screen
function Wait(number)
    for i=0,number-1 do
        emu.frameadvance()
        --display the metal slime's HP
        gui.text(120,150,'HP: '..(memory.readbyte(0x727E) + memory.readbyte(0x727F) * 256))

        gui.text(30,170,'Total: '..total)

        if(total ~= 0) then
            gui.text(30,210,'Wins: '..wins..' ('..(math.floor(1000 * wins / (total)) / 10)..'%)')
            gui.text(30,230,'Run: '..runs..' ('..(math.floor(1000 * runs / (total)) / 10)..'%)')
            gui.text(30,250,'Para: '..para..' ('..(math.floor(1000 * para / (total)) / 10)..'%)')
        end
    end
end

--the main loop, this runs forever
while true do
    --load the savestate (a single Metal Slime)
    savestate.loadslot(save_state_slot);

    --load the previous rng values back into the state
    memory.writebyte(0x0012,rng1);
    memory.writebyte(0x0013,rng2);
    memory.writebyte(0x050D,rng3);

    --while the metal slime's HP is still greater than 0, run the attack loop
    while (memory.readbyte(0x727E) > 0x00) do
        Wait(math.random(5)+1); --wait a random number of frames
        joypad.set({A=true}, 1)
        Wait(1);
        joypad.set({A=false}, 1)

        --this reads the status byte and detects if the metal slime ran away, and breaks the loop
        if (memory.readbyte(0x727A) == 0x01) then break end
    end

        --read the variables we need to record data
        status = memory.readbyte(0x727A);

        if status == 0x01 then
            --this means the slime ran
            runs = runs + 1;
        elseif status == 0xE0 then
            --this means the slime was paralyzed and killed (only relevant if Brey is equipped with the Venomous Dagger)
            wins = wins + 1;
            para = para + 1;
        else
            --Metal Slime was killed
            wins = wins + 1;
        end

        total = total + 1;

        --save the RNG values for the next loop
        rng1 = memory.readbyte(0x0012)
        rng2 = memory.readbyte(0x0013)
        rng3 = memory.readbyte(0x050D)

        Wait(1);

end