local position = {
	x = 0, y = 0, z = 0
}

local start_point = {
	x = 0, y = 0, z = 0
}

position.x, position.y, position.z = ...;
start_point.x = position.x; start_point.y = position.y;
start_point.z = position.z;


function Deploy_minions()
	clear();
	for i=1,4,1 do
		turtle.select(i);
		turtle.place();
		turtle.turnRight();
	end
end

function Excavate()
	local a = peripheral.wrap('front');
	local b = peripheral.wrap('left');
	local c = peripheral.wrap('back');
	local d = peripheral.wrap('right');
	a.turnOn(); b.turnOn(); c.turnOn(); d.turnOn();
end

function clear()
	for i=1,4,1 do
		turtle.dig();
		turtle.turnRight();
	end
end

function Wait_for_minions()
	--[[ Write code to detect if blocks are around big cheese ]]
	local x = 0;
	while x < 4 do
		local res = turtle.detect();
		if res then
			x = x + 1;
			turtle.turnRight();
		end
	end

	if position.y < 22 then
		Redstone_pulse();
		Up();
		sleep(5);
		Wait_for_minions();
	else
		Break_minions();
	end

end

function Break_minions()
	for i=1, 4, 1 do
		turtle.dig();
		turtle.turnRight();
	end
	Ascend();
end

function Descend()
	while position.y > 8 do
		Down();
	end
end

function Ascend()
	while position.y < start_point.y do
		Up();
	end
end

function Populate_position()
	--[[ Terrible code. ]]
	-- position.y = 100;
	-- This function might be obsolete.
end


function Down()
	if turtle.detectDown() then
		turtle.digDown();
	end
	turtle.down();
	position.y = position.y - 1;
end

function Up()
	if turtle.detectUp() then
		turtle.digUp()
	end
	turtle.up()
	position.y = position.y + 1;
end

function Forward()
	if turtle.detect() then
		turtle.dig();
	end
	turtle.forward()
end

function Redstone_pulse()
	redstone.setOutput('front', true);
	redstone.setOutput('back', true);
	redstone.setOutput('left', true);
	redstone.setOutput('right', true);
	sleep(0.5);
	redstone.setOutput('front', false);
	redstone.setOutput('back', false);
	redstone.setOutput('left', false);
	redstone.setOutput('right', false);
end

print(start_point);
print(position.hi);
local lowest_level = 8;
local highest_level = 22;

--[[ turtle.refuel();
turtle.select() ]]
function Init()
	turtle.select(1);
	Populate_position();
	Descend()
	Deploy_minions();
	Excavate();
	Redstone_pulse();
	sleep(8);
	Wait_for_minions();
end

if !(position.z == nil) then
	Init();
else
	print("must pass coords to turtle");
end