pong

local max_x, max_y = term.getSize()
local p1 = 1
local p1_score = 0
local p2 = 1
local p2_score = 0
local ball = {
    x = max_x/2,
    y = max_y/2,
    direction_x = -1,
    direction_y = 1
}
local pressing = {}
local win = 0

local function reset()
    term.setCursorPos(1,1)
    term.clear()
    term.setBackgroundColor(colors.black)
end

local function update()
    while true do

        if pressing[keys.w] then
            p1 = (p1 == 1) and p1 or p1 - 1
        end
        if pressing[keys.s] then
            p1 = (p1+5 == max_y) and p1 or p1 + 1
        end

        if pressing[keys.up] then
            p2 = (p2 == 1) and p2 or p2 - 1
        end
        if pressing[keys.down] then
            p2 = (p2+5 == max_y) and p2 or p2 + 1
        end

        local addx = (ball.x + ball.direction_x) --addx >= max_x or addx <= 1 bounce
        local addy = (ball.y + ball.direction_y)

        if (addx < 4 or addx > max_x-3) then -- in bounds
            if (addx < max_x/2 and (p1 <= addy and addy <= p1+6)) or (addx > max_x/2 and (p2 <= addy and addy <= p2+6)) then -- left side
                ball.direction_x = -ball.direction_x
            end
        end
        if (ball.x < 3) then --out of bounds
            p2_score = p2_score + 1
            ball.x = max_x/2
            ball.y = max_y/2
        elseif (ball.x > max_x-2) then --out of bounds
            p1_score = p1_score + 1
            ball.x = max_x/2
            ball.y = max_y/2
        end
        if p1_score == win or p2_score == win then
            reset()

            write(p1_score>p2_score and "PLAYER 1 WINS" or "PLAYER 2 WINS")

            os.sleep(5)
            p1_score = 0
            p2_score = 0

            return
        end

        if addy >= max_y or addy <= 1  then
            ball.direction_y = -ball.direction_y
        end
        ball.x = ball.x + ball.direction_x
        ball.y = ball.y + ball.direction_y


        paintutils.drawFilledBox(1,1,max_x,max_y,colors.black)

        paintutils.drawLine(max_x/2,1,max_x/2,max_y,colors.gray) -- line

        paintutils.drawFilledBox(2,p1,3,p1+5,colors.white)

        paintutils.drawFilledBox(max_x-2,p2,max_x-3,p2+5,colors.white)

        paintutils.drawPixel(ball.x,ball.y,colors.blue)

        term.setCursorPos((max_x/2)-#tostring(p1_score),1)
        write(p1_score)

        term.setCursorPos((max_x/2)+1,1)
        write(p2_score)

        os.sleep(0.1)
    end
end

local function input_control()
    while true do

        local event, key = os.pullEvent()
        if event == "key" then
            pressing[key] = true
        elseif event == "key_up" then
            pressing[key] = false
        end
    end
end

while true do
    reset()

    write("PRESS ENTER TO START PONGING\n")
    local _, key = os.pullEvent("key")

    if key == keys.enter then
        write("ENTER WIN NUMBER: ")
        win = tonumber(read())
        if win then
            parallel.waitForAny(update, input_control)
        end
    end
end