NAMES = {'TConstruct:SearedBrick','chisel:marble','chisel:granite','chisel:diorite','minecraft:chest', 'ComputerCraft:CC-TurtleExpanded','minecraft:obsidian','minecraft:flowing_lava','minecraft:flowing_water','minecraft:lava','minecraft:water','chisel:andesite','chisel:limestone','minecraft:dirt','minecraft:stone','minecraft:granite','minecraft:diorite','minecraft:andesite','minecraft:gravel', 'minecraft:sand', 'minecraft:cobblestone'}
PROTOCOL = 'mine'
HOSTNAME = 'mineman'

function is_stone(success, data)
	if success then
		for i = 1, #NAMES do
			if NAMES[i] == data.name then
				return ""
			end
		end
		local id = rednet.lookup(PROTOCOL, HOSTNAME)
		if id then
			rednet.send(id, data.name, PROTOCOL)
		end
		return false
	end
	return true
end

function dig_vein(i, path, moving_back)
	if path[i] == nil then
		path[i] = {}
	end
	--check up down and forward first,
	if not moving_back then
		if #path[i] == 0 then
			if not is_stone(turtle.inspectUp()) then
				path[i][#path[i]+1] = 0
			end
			if not is_stone(turtle.inspectDown()) then
				path[i][#path[i]+1] = 1
			end
			for j = 1, 4 do--forward, left, back, right
				if not is_stone(turtle.inspect()) then
					path[i][#path[i]+1] = 1 + j
				end
				turtle.turnLeft()
			end
		end
		if #path[i] == 0 then--go back from the path you started
			return dig_vein(i, path, true)
		else
			local dir = path[i][1]
			if dir == 0 then
				turtle.digUp()
				for x=0,20 do
					if not turtle.up() then
						turtle.digUp()
					else
						break
					end
				end
			elseif dir == 1 then
				turtle.digDown()
				turtle.down()
			elseif dir == 2 then
				turtle.dig()
				for x=0,20 do
					if not turtle.forward() then
						turtle.dig()
					else
						break
					end
				end
			elseif dir == 3 then
				turtle.turnLeft()
				turtle.dig()
				for x=0,20 do
					if not turtle.forward() then
						turtle.dig()
					else
						break
					end
				end
			elseif dir == 4 then
				turtle.turnLeft()
				turtle.turnLeft()
				turtle.dig()
				for x=0,20 do
					if not turtle.forward() then
						turtle.dig()
					else
						break
					end
				end
			elseif dir == 5 then
				turtle.turnRight()
				turtle.dig()
				for x=0,20 do
					if not turtle.forward() then
						turtle.dig()
					else
						break
					end
				end
			end
			i = i + 1
			return dig_vein(i, path, false)
		end
	else--moving back
		i = i - 1
		if i == 0 then
			return 0
		elseif #path[i] > 0 then
			local dir = path[i][1]
			if dir == 0 then
				turtle.down()
			elseif dir == 1 then
				for x=0,20 do
					if not turtle.up() then
						turtle.digUp()
					else
						break
					end
				end
			elseif dir == 2 then
				turtle.back()
			elseif dir == 3 then
				turtle.back()
				turtle.turnRight()
			elseif dir == 4 then
				turtle.back()
				turtle.turnLeft()
				turtle.turnLeft()
			elseif dir == 5 then
				turtle.back()
				turtle.turnLeft()
			end
			table.remove(path[i], 1)
			if #path[i] > 0 then
				return dig_vein(i, path, false)
			else
				return dig_vein(i, path, true)
			end
		end
	end
end

function refuel(f)
	for k = 1, 16 do
		turtle.select(k)
		if turtle.refuel(f) then
			return true
		end
	end
end

function dropAll()
	for k = 1, 16 do
		turtle.select(k)
		turtle.dropDown()
	end
end

function hasSpace()
    for slot=1,16 do
        if turtle.getItemDetail(slot) == nil then
        	return true
        end
    end
    return false
end

function split(inputstr, sep)
        if sep == nil then
                sep = "%s"
        end
        local t={} ; i=1
        for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
                t[i] = str
                i = i + 1
        end
        return t
end

function mine(length)
	for i=1,length do
		if i == 100 then
			break
		end
		if turtle.getFuelLevel() < (length*1.2) then
			if not refuel(2) then
				return false
			end
		end
		if not hasSpace() then
			for k = 2, i do
				turtle.back()
			end
			refuel(5)
			dropAll()
			if turtle.getFuelLevel() < (i*1.2) then
				return false
			end
			for k = 2, i do
				for x=0,20 do
					if not turtle.forward() then
						turtle.dig()
					else
						break
					end
				end
			end
		end
		if turtle.detect() then
			turtle.dig()
		end
		for x=0,20 do
			if not turtle.forward() then
				turtle.dig()
			else
				break
			end
		end
		dig_vein(1,{},false)
		if turtle.detectDown() then
			turtle.digDown()
		end
		turtle.down()
		dig_vein(1,{},false)
		for x=0,20 do
			if not turtle.up() then
				turtle.digUp()
			else
				break
			end
		end
	end
	turtle.turnLeft()
	turtle.turnLeft()
	for i = 1, length do
		for x=0,20 do
			if not turtle.forward() then
				turtle.dig()
			else
				break
			end
		end
		if turtle.getFuelLevel() == 0 then
			return false
		end
	end
	dropAll()
	return true
end

rednet.open('right')

while true do
	local id, msg, prot = rednet.receive()
	local id1 = rednet.lookup(PROTOCOL, HOSTNAME)
	if id1 and id == id1 and prot == PROTOCOL then
		print('got cmd')
		tokens = split(msg, ' ')
		if #tokens == 2 and tokens[1] == 'mine' then
			print('got mine cmd')
			mine(tonumber(tokens[2]))
		end
	end
end