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local w,h = term.getSize()
local pos = (w/2)-3
local score = 0
local fscore = 0
local bricks = {}
local ballx = (w/2)+0.5
local bally = h-8
local ballvx = 1
local ballvy = 1
local lose = false
for i=1,3 do
  for j=1,w do
    local obj = {}
    obj["x"] = j
    obj["y"] = i+1
    obj["broken"] = false
    bricks[#bricks+1] = obj
  end
end
term.setBackgroundColor(colors.black)
term.clear()
function keyPress()
  while true do
    event, key = os.pullEvent("key")
    if key == keys.right then
      pos = pos+1
    end
    if key == keys.left then
      pos = pos-1
    end
    if key == keys.r then
      pos = (w/2)-3
      score = 0
      fscore = 0
      bricks = {}
      ballx = (w/2)+0.5
      bally = h-8
      ballvx = 1
      ballvy = 1
      lose = false
      for i=1,3 do
        for j=1,w do
          local obj = {}
          obj["x"] = j
          obj["y"] = i+1
          obj["broken"] = false
          bricks[#bricks+1] = obj
        end
      end
    end
    draw()
  end
end
function draw()
  term.setBackgroundColor(colors.black)
  term.clear()
  term.setBackgroundColor(colors.white)
  for i=0,6 do
    term.setCursorPos(pos+i, h-1)
    term.write(" ")
  end
  term.setBackgroundColor(colors.lightGray)
  for i=1,w do
    term.setCursorPos(i, 1)
    term.write(" ")
  end
  term.setTextColor(colors.white)
  term.setCursorPos(1,1)
  term.write(score)
  for i=1,#bricks do
    term.setBackgroundColor(colors.magenta)
    term.setCursorPos(bricks[i]["x"], bricks[i]["y"])
    if bricks[i]["broken"] == false then
      term.write(" ")
    end
  end
  term.setBackgroundColor(colors.white)
  term.setTextColor(colors.black)
  term.setCursorPos(ballx, bally)
  term.write(" ")
  if lose == true then
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.white)
    term.clear()
    fscore = score
    centertext("Final Score: "..fscore, h/2)
    centertext("Press R to restart", (h/2)+1)
  end
end
function ballmove()
  while true do
    ballx = ballx + ballvx
    bally = bally + ballvy
    if ballx > pos and ballx < pos+6 and bally > h-3 and bally < h-1 then
      bounce(1)
    end
    if bally < 2 then
      bounce(1)
    end
    if ballx > w-1 then
      bounce(2)
    end
    if ballx < 1 then
      bounce(2)
    end
    if bally > h then
      lose = true
    end
    for i=1,#bricks do
      if bricks[i]["x"] == ballx and bricks[i]["y"] == bally and bricks[i]["broken"] == false then
        bounce(1)
        bricks[i]["broken"] = true
        score = score+1
      end
    end
    draw()
    sleep(0.14)
  end
end
function bounce(dir)
  if dir == 1 then
    ballvy = -ballvy
  end
  if dir == 2 then
    ballvx = -ballvx
  end
end
function centertext(text, height)
  term.setCursorPos((w/2)-(string.len(text)/2), height)
  term.write(text)  
end
draw()
parallel.waitForAll(keyPress, ballmove)