local robot = require("robot")
local moving = true
local moving2 = true
local invPos = 1

function verifyInv()
   if(robot.count(invPos) == 0) then
      invPos = invPos + 1
      if(invPos > (robot.inventorySize() - 1) or robot.count(invPos) == 0) then
         return false
      end
      robot.select(invPos)
   end

   return true
end

function replaceBlockForward()
   local check = verifyInv()

   if(check) then
      robot.swing()
      robot.place()
   end

   return check
end

function replaceBlockBeneath()
   local check = verifyInv()

   if(check) then
      robot.swingDown()
      robot.placeDown()
   end

   return check
end

function diveReplace()
   local check = true
   local moving2 = robot.down()
   if(moving2) then
      if(not replaceBlockBeneath()) then
         check = false
      end
      robot.up()
   end

   return check
end

while moving do
   for move=1,93 do
      moving = robot.forward()
      if(not moving) then
         break
      end
   end

   if(not moving) then
      break
   end

   -- Pierwszy klocek na scianie
   robot.turnRight()
   if(not replaceBlockForward()) then
      break
   end

   robot.turnLeft()
   moving = robot.forward()
   if(not moving) then
      break
   end
   moving = robot.down()
   if(not moving) then
      break
   end

   -- Drugi klocek na scianie
   robot.turnRight()
   if(not replaceBlockForward()) then
      break
   end

   robot.turnLeft()
   moving = robot.forward()
   if(not moving) then
      break
   end

   -- Probujemy zejsc nizej i postawic trzeci klocek na scianie nr 1 oraz klocek nizej
   moving2 = robot.down()
   if(moving2) then
      robot.turnRight()
      if(not replaceBlockForward()) then
         break
      end
      robot.turnLeft()
      if(not replaceBlockBeneath()) then
         break
      end
      robot.up()
   end

   -- Przechodzimy przez tory
   moving = robot.forward()
   if(not moving) then
      break
   end
   moving = robot.forward()
   if(not moving) then
      break
   end

   robot.turnLeft()
   if(not moving) then
      break
   end
   moving = robot.forward()
   if(not moving) then
      break
   end
   moving = robot.forward()
   if(not moving) then
      break
   end

   -- Kladziemy pierwszy na srodku
   moving = diveReplace()
   if(not moving) then
      break
   end

   robot.forward()
   robot.turnRight()
   robot.forward()

   moving = diveReplace()
   if(not moving) then
      break
   end

   robot.forward()
   robot.turnLeft()
   robot.forward()

   moving = diveReplace()
   if(not moving) then
      break
   end

   robot.forward()
   robot.forward()

   robot.turnRight()

   robot.forward()
   robot.forward()

   moving2 = robot.down()
   if(moving2) then
      if(not replaceBlockBeneath()) then
         break
      end
      robot.turnLeft()
      if(not replaceBlockForward()) then
         break
      end
      robot.turnLeft()
      robot.up()
   end

   robot.forward()

   robot.turnRight()

   if(not replaceBlockForward()) then
      break
   end

   robot.turnLeft()
   robot.forward()
   robot.up()
   robot.turnRight()

   if(not replaceBlockForward()) then
      break
   end

   robot.turnRight()
   robot.turnRight()
   for move=1,6 do
      moving = robot.forward()
      if(not moving) then
         break
      end
   end

   if(not moving) then
      break
   end

   robot.turnLeft()
end