Direction = {
    new = function (self, dir_name, ex, ze)
        local new = {}
        setmetatable(new, {__index = self})
        self.vector = {x = ex, z = ze}
        self.dir_name = dir_name
        return new
    end
}

Directions = {
    Direction:new("n", 0, -1), -- n
    Direction:new("e", 1, 0), -- e
    Direction:new("s", 0, 1), -- s
    Direction:new("w", -1, 0) -- w
}

-- Config = textutils.unserialize(fs.open("/heirteir/drone/config/config.data", "r").readAll())

Command = {
    new = function (self, func)
        local new = {}
        setmetatable(new, {__index = self})
        self.command = func
        return new
    end,
    getCommand = function (self)
        return self.command
    end
}

CommandBuffer = {
    commands = {},
    running_command = false,
    new = function (self)
        local new = {}
        setmetatable(new, {__index = self})
        return new
    end,
    finishQueue = function (self)
        for val = 1, table.getn(self.commands), +1 do
            self:runNextCommand()
        end
    end,
    runNextCommand = function (self)
        if self.running_command then return end

        self.running_command = true

        if self.commands[0].getCommand() then table.remove(self.commands, 0) end

        self.running_command = false
    end,
    addCommand = function (self, func)
        table.insert(self.commands, Command:new(func))
    end
}

MiningDrone = {
    new = function (self, dir)
        local new = {}
        setmetatable(new, {__index = self})
        self.command_buffer = CommandBuffer:new()
        self.origin = {value = {0, 0, 0}, direction = dir}
        self.current_pos = {value = {0, 0, 0}, direction = dir}
        return new
    end,
    queryDirection = function(self)
        print("Please enter the facing direction: ")
        local input = read()
        local dir = 0

        for val = 1, #Directions, +1 do
            if Directions[val].dir_name == input then dir = val break end
        end

        self.current_pos.direction = dir
    end,
    stripMine = function (self)
        self:queryDirection()

        local up = true

        for val = 1, 20, +1 do
            if up then
                self:up(2)
                self:forward(1)
            else then
                self:down(2)
                self:forward(1)
            end

            up = not up
        end
    end,
    dig = function (self)
        while (turtle.detect()) do
            turtle.dig()
            sleep(0.4)
        end
        return true
    end,
    digUp = function (self)
        while (turtle.detectUp()) do
            turtle.DigUp()
            sleep(0.4)
        end
    end,
    digDown = function (self)
        while (turtle.detectDown()) do
            turtle.DigDown()
            sleep(0.4)
        end
    end,
    forward = function (self, amt)
        for val = 1, amt, +1 do
            self:dig()

            while not turtle.forward() do sleep(0.4) end
        end
        return true
    end,
    up = function (self, amt)
        for val = 1, amt, +1 do
            self:digUp()

            while not turtle.up() do sleep(0.4) end
        end
    end,
    down = function(self, amt)
        for val = 1, amt, +1 do
            self:digDown()

            while not turtle.down() do sleep(0.4) end
        end
    end,
    turn = function (self, amt)
        if amt < 0 then
            amt = math.abs(amt)
            for val = 1, amt, +1 do
                self::turnLeft()
            end
        elseif amt > 0 then
            amt = math.abs(amt)
            for val = 1, amt, +1 do
                self::turnRight()
            end
        end
    end,
    turnRight = function(self)
        turtle.turnRight()
        self.current_pos.direction = (self.current_pos.direction + 1) % 4
        return true
    end,
    turnLeft = function(self)
        turtle.turnLeft()
        self.current_pos.direction = (self.current_pos.direction - 1) % 4
        return true
    end
}