--- Command Buffer Class ---

CommandBuffer = {commands = {}}

--- New Command Buffer ---

function CommandBuffer:new ()
    cmd_bfr = {}
    setmetatable(cmd_bfr, self)
    self.__index = self
    self.commands = {}
    self.running_command = false
    return cmd_bfr
end

--- Command Buffer Functions ---

function CommandBuffer:RunNextCommand(func)
    if self.running_command return false
    self.running_command = true

    if not self.commands[0].func() return false

    table.remove(self.commands, 0)

    self.running_command = false
end

function CommandBuffer:AddCommand(func)
    table.insert(self.commands, Command:new(func))
end

--- Command Class ---

Command = {func = nil}

--- New Command ---

function Command:new (exe)
    cmd = {}
    setmetatable(cmd, self)
    self.__index = self
    self.func = exe
    return cmd
end

--- Command Functions ---

--- Mining Drone ---

MiningDrone = {
    command_buffer = nil,
}

--- New Mining Drone ---

function MiningDrone:new ()
    mngdrn = {}
    setmetatable(mngdrn, self)
    self.__index = self
    self.command_buffer = CommandBuffer:new
    return mngdrn
end

--- Test ---

function MiningDrone:test ()
    self.command_buffer.AddCommand(turtle.dig())
    self.command_buffer.RunNextCommand()
end