spawner

local choices = {
{" Chickens",false,colors.gray},
{" Blazes",false,colors.yellow},
{" Endermen",false,colors.black},
{" Spiders",false,colors.brown},
{" Creepers",false,colors.green}
}

local door = {true, colors.white}
local size = #choices;
local totalColor = 0

for i=1,size do
  totalColor = totalColor + choices[i][3]
end

function update()
cx,cy = term.getCursorPos()
term.clear()
term.setCursorPos(1,1)
for i=1,size do
    if choices[i][2] then
        term.setTextColor(colors.green)
    else
        term.setTextColor(colors.red)
    end
    print(choices[i][1])
end

term.setCursorPos(1,size+2)
term.setTextColor(colors.white)

if door[1] then
    term.setTextColor(colors.green)
else
    term.setTextColor(colors.red)
end
print(" Door")

term.setCursorPos(1,18)
term.setTextColor(colors.white)
write("Up/Down to select, Enter to toggle")
term.setCursorPos(cx,cy)

signal()
end


function signal()
local output = 0
if door[1] then
 output = door[2]
else
 for i=1,size do
    if choices[i][2] then
      output = output-choices[i][3]
    end
 end
end
redstone.setBundledOutput("back",totalColor + output)
end


term.setCursorBlink(true)
term.setCursorPos(1,1)
update()

while true do
    event, p1 = os.pullEvent()
    x,y = term.getCursorPos()

    if event == "key" then
        if p1 == 28 then-- enter
            if y <= size then
                for i = 1,size do
                if i ~= y then
                 choices[i][2] = false
                 end
                end
                choices[y][2] = not choices[y][2]

                if choices[y][2] then
                    door[1] = false
                end
            elseif y == size+2 then
                door[1] = not door[1]
                if door[1] then
                    for i = 1,size do
                        choices[i][2] = false
                    end
                end
            end
            update()
        elseif p1 == 200 then-- up
            if y - 1  >= 1 then
                term.setCursorPos(x,y-1)
            end
        elseif p1 == 208 then-- down
            if y + 1 <= size+2 then
                term.setCursorPos(x,y+1)
            end
        end

    end
end
-- up 200
-- down 208
-- enter 28


--spider
--chicken
--blaze
--endermen