term.clear()
term.setCursorPos(1,1)

repeat
print("Enter tunnel Length (even number): ")
length = read()
print("Enter height (even number): ")
height = read()
print("Enter Width (even number): ")
width = read()
until length % 2 == 0
term.clear()
while turtle.getItemCount(1) == 0 do
	print("Place fuel in slot 1.")
	read()
end
while turtle.getItemCount(2) == 0 do
	print("Place torches in slot 2.")
	read()
end

print("Place chest behind turtle.\n")

term.clear()
print("Here we go!")
torchpos = 0


function fuel()
        if turtle.getFuelLevel() < 0.26 then
                turtle.select(1)
                turtle.refuel(1)
        end
end

function mine()
        local LoopHeight = 0
        local LoopWidth = 0
        local LoopLength = 0

        fuel()
--odd numbers left even numbers right
        for LoopLength = 0, length - 1 do
                for LoopHeight = 0, height - 1 do
                        if LoopHeight % 2 == 0 then
                                turtle.turnLeft()
                                for LoopWidth = 0, width -1 do
                                        leftDown()
print("LoopWidthL: ", LoopWidth)
                                end
				if LoopHeight == height - 1 then
					endHeightCheck(LoopWidth)
				end
                                turtle.turnRight()
                        else
                                turtle.turnRight()
                                for LoopWidth = 0, width -1 do
                                        rightDown()
print("LoopWidthR: ", LoopWidth)
                               end
				if LoopHeight == height - 1 then
					endHeightCheck(LoopWidth)
				end

                              turtle.turnLeft()
                        end
			if LoopHeight ~= height - 1 then
				checkEmptyDown()
        		end
                end
        if LoopLength % 2 == 0 then
                turtle.turnRight()
        else
                turtle.turnLeft()
        end

        end
end


function checkEmptySpace()
        while turtle.detect() == true do
                turtle.dig()
        end
end

function leftDown()
        checkEmptySpace()
        turtle.forward()
end

function rightDown()
        checkEmptySpace()
        turtle.forward()
end
function checkEmptyDown()
	if turtle.detectDown() == true then
		turtle.digDown()
        end
        turtle.down()
end

function endHeightCheck(LoopWidth)
  	       if LoopWidth % 2 == 1 then
print("R")
			turtle.turnRight()
			checkEmptySpace()
               		turtle.forward()
print("0: ")
read()
                 else
print("L")
			turtle.turnLeft()
			checkEmptySpace()
	                turtle.forward()
print("1: ")
read()
                        end
end
mine()