local shell = require("shell")
local robot = require("robot")
local sides = require("sides")
local args, ops = shell.parse(...)

local distance = {}
distance.x = tonumber(args[1])
distance.y = tonumber(args[2])
distance.z = tonumber(args[3])

local gone = {}
gone.x = 0
gone.y = 0
gone.z = 0

local slots = robot.inventorySize()
local chest_slot = slots

-- Mine the block in front of the robot.
function mineForward()
	local blocked, type = robot.detect()
	while (blocked) do
		robot.swing()
		blocked, type = robot.detect()
	end
end

-- Mine the block below the robot.
function mineDown()
	local blocked, type = robot.detectDown()
	while (blocked) do
		robot.swingDown()
		blocked, type = robot.detectDown()	
	end	
end

-- Dump inventory into the ender chest.
function dump(side)
	robot.select(chest_slot)
	if (side == sides.back) then
		robot.turnAround()
		robot.place()
	else
		robot.placeUp()
	end
	local pos = 1
	while (pos <= slots) do
		robot.select(pos)
		if (side == sides.back) then
			robot.drop()
		else
			robot.dropUp()
		end
		pos = pos + 1
	end
	if (side == sides.back) then
		robot.swing()
		robot.turnAround()
	else
		robot.swingUp()
	end
end

-- Assume full if the last slot is non-empty.
function isFull()
	return robot.count(slots - 1) > 0
end

-- Dump if full.
function maybeDump(side)
	if (isFull()) then dump(side) end
end

-- Move forward one block.
function moveForward()
	mineForward()
	robot.forward()
	maybeDump(sides.back)
end

-- Move down one block.
function moveDown()
	mineDown()
	robot.down()
	maybeDump(sides.top)
end	

-- Main loop.
function main()
	while (gone.z < distance.z) do
		while (gone.x < distance.x) do
			if (gone.x ~= 0) then
				if (gone.x % 2 == 0) then
					robot.turnLeft()
					moveForward()
					robot.turnLeft()
				else
					robot.turnRight()
					moveForward()
					robot.turnRight()
				end
			end

			while (gone.y < distance.y) do
				moveForward()
				gone.y = gone.y + 1
			end
			
			gone.y = 0
			gone.x = gone.x + 1
		end

		moveDown()
		robot.turnAround()

		gone.y = 0
		gone.x = 0
		gone.z = gone.z + 1
	end
end

main()
dump()