-- TODO: fill liquid/air and remove falling blocks

local status = "Idle"
local cycles = 1
local cyclesDone = 0
local blocksBroken = 0
local blocksPlaced = 0

-- Continuiesly updates terminal to inform user of status
function uiLoop()
	while true do
		term.clear()
		term.setCursorPos(1, 1)
		term.write("Status: " .. status .. "\n")
		term.write("Fuel:   " .. turtle.getFuelLevel() .. "\n")
		term.write("Cycles: " .. cyclesDone .. "/" .. cycles .. "\n")
		sleep(1)
	end
end

-- Main loop controlling the turtles actions
function minerLoop()
	for i = 1, cycles do
		checkFuelSufficient()
		mineSlice()
		mineCorridor()
		cyclesDone = cyclesDone + 1
	end
end

-- Refuel if needed to ... movements required per cycle: 34
function checkFuelSufficient()
	while turtle.getFuelLevel() < 35 do
		turtle.select(16)
		if turtle.refuel(0) then
			turtle.refuel(1)
		else
			status = "Out of Fuel!"
			while not turtle.refuel(0) do
				sleep(1)
			end
		end
	end
end

-- Mines a strip on either side of the main corridor
function mineSlice()
	status = "Mining slice..."
	turtle.dig()
	turtle.forward()
	turtle.turnLeft()
	repeatMineForward(6)
	endLeftStrip()
	repeatMineForward(13)
	endRightStrip()
	repeatMineForward(6)
	turtle.digUp()
	turtle.forward()
	turtle.digUp()
	turtle.turnRight()
end

-- Continue main corridor
function mineCorridor()
	status = "Continuing main corridor..."
	mine3YForward()
	turtle.turnRight()
	mine3YForward()
	turtle.turnLeft()
	mine3YForward()
	turtle.turnLeft()
	mine3YForward()
	turtle.turnRight()
	turtle.turnRight()
	placeTorchForward()
	turtle.turnLeft()
end

-- Place a torch and turn around at the end of the left side stip
function endLeftStrip()
	turtle.dig()
	placeTorchForward()
	turtle.digDown()
	turtle.down()
	turtle.dig()
	turtle.turnLeft()
	turtle.turnLeft()
end

-- Place a torch and turn around at the end of the right side stip
function endRightStrip()
	turtle.dig()
	turtle.digUp()
	turtle.up()
	turtle.dig()
	placeTorchForward()
	turtle.turnLeft()
	turtle.turnLeft()
end

-- Mines forward i times
function repeatMineForward(i)
	for i = 1, i do
		turtle.dig()
		turtle.forward()
	end
end

-- Mines a 1x3x1 column in front and moves into it
function mine3YForward()
	turtle.dig()
	turtle.forward()
	turtle.digUp()
	turtle.digDown()
end

-- Places a torch directly in front
function placeTorchForward()
	turtle.select(15)
	turtle.place()
end

---- START POINT ----

-- Initialization
while true do
	term.clear()
	term.setCursorPos(1, 1)
	term.write("Enter number of cycles to be done: ")
	cycles = tonumber(read())
	if (cycles == nil) then
		term.write("That's not a number!\n")
		sleep(1)
	else
		break
	end
end

-- Start main loop
parallel.waitForAny(uiLoop, minerLoop)

-- End
term.clear()
term.setCursorPos(1, 1)
term.write("AutoMiner Done.\n")