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()
if LoopLength > 1 then
        print("LoopLength: ", LoopLength)
	print("LoopHeight: ", LoopHeight)
print("Width: ", width)
        read()
end

                                for LoopWidth = 0, width -2 do
                                        leftDown()
--print("LoopWidthL: ", LoopWidth)
                                end
                                if LoopHeight == height - 1 then
                                        endHeightCheck(LoopWidth, LoopLength)
                                end
                                turtle.turnRight()
                        else
                                turtle.turnRight()
                                for LoopWidth = 0, width -2 do
                                        rightDown()
--print("LoopWidthR: ", LoopWidth)
                               end
                                if LoopHeight == height - 1 then
                                        endHeightCheck(LoopWidth, LoopLength)
                                end
                              turtle.turnLeft()
                        end
                        if LoopHeight ~= height - 1 then
                                if LoopLength % 2 == 0 then
                                        checkEmptyDown()
                                else
                                        checkEmptyUp()
                                end
                        end
                end
        if LoopLength % 2 == 0 then
                turtle.turnRight()
print("Length check Right: ")
read()
        else
                turtle.turnLeft()
print("Length check left: ")
read()
        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 checkEmptyUp()
        if turtle.detectUp() == true then
                turtle.digUp()
        end
        turtle.up()
end

function endHeightCheck(LoopWidth, LoopLength)
	if LoopLength % 2 == 0 then
               if LoopWidth % 2 == 1 then
                        turtle.turnRight()
                        checkEmptySpace()
                        turtle.forward()
                 else
                        turtle.turnLeft()
                        checkEmptySpace()
                        turtle.forward()
                 end
	else
		if LoopWidth % 2 == 0 then
        	               turtle.turnRight()
                	        checkEmptySpace()
                        turtle.forward()
                 else
                 	       turtle.turnLeft()
                       	       checkEmptySpace()
                        	turtle.forward()
                 end
	end
end
mine()