--[[
	Goals of the Mining Turtle:
	-Mine 2x1 mine shafts 54 blocks deep
	-Place torches to prevent mob spawning
	-Scan for ores (Hard to implement)
	-Drop Cobblestone, Sand, Dirt, and Gravel
	-Refuel as needed (Not needed yet)
	-Place items in a chest near the entrance of each shaft
	-Take in an input of the amount of shafts to build on one wall (Not yet)
	-Replace any walls as needed on the top or sides of the shaft
	-Return to start position when done.
--]]

--Coordinates and Orientation
startXCoord =
startYCoord =
startZCoord =
xCoord = startXCoord
yCoord = startYCoord
zCoord = startZCoord
orientation =
orientations{0,1,2,3}
xDiff = {-1,0-,1,0}		--Changes in xCoord when moving in an orientation 0 = north
zDiff = {0,1,0,-1}		--Changes in yCoord when moving in an orientation 0 = north

--Movement Functions
function left()
	orientation = orientation - 1
	orientation = (orientation - 1) % 4
	orientation = orientation + 1
	turtle.turnLeft()
end
function right()
	orientation = orientation - 1
	orientation = (orientation + 1) % 4
	orientation = orientation + 1
	turtle.turnLeft()
end
function look(direction)
	while direction ~= orientations[orientation]
		right()
	end
end
function moveForward()
	xCoord = xCoord + xDiff[orientation]
	zCoord = zCoord + zDiff[orientation]
	turtle.dig()
	moved = false
	while not(moved) do
		moved = turtle.forward()
	end
end
function moveUp()
	yCoord = yCoord + 1
	turtle.digUp()
	moved = false
	while not(moved) do
		moved = turtle.up()
	end
end
function moveDown()
	yCoord = yCoord - 1
	turtle.digUp()
	moved = false
	while not(moved) do
		moved = turtle.down()
	end
end
function moveTo(xTarget, yTarget, zTarget)
	while yCoord < yTarget do
		moveUp()
	end
	while yCoord > yTarget do
		moveDown()
	end
	if xCoord > xTarget then
		look(3)
		while xCoord > xTarget do
			moveForward()
		end
	end
	if xCoord < xTarget
		look(1)
		while xCoord < xTarget do
			moveForward()
		end
	end
end

--Building the shaft functions

function placeTorch()
	turtle.select(16)
	turtle.placeDown()
end

function digPortion()
	turtle.digUp()
	moveForward()
	turtle.digUp()
	moveForward()
	turtle.digUp()
	moveForward()
	moveUp()
	turnLeft()
	for i = 1, 5 do
		moveForward()
	end
	turnLeft()
	turnLeft()
	for i = 1, 10 do
		moveForward()
	end
	turnLeft()
	turnLeft()
	for i = 1, 5 do
		moveForward()
	end
	turnRight()
	moveDown()
	moveForward()
end

function digUpToTorch()
	placeTorch()
	for i = 1, 3 do
		digPortion()
	end
end

for i = 1, 4 do
	digUpToTorch()
end
digPortion()
turtle.digUp()
moveForward()
turtle.digUp()
moveForward()
moveUp()
for i = 1, 5 do
	moveForward()
end
moveTo(startXCoord, startYCoord, startZCoord)