defmodule BuffLog do
  use GenServer

  def init([acc_uuid, options]) do
    ets = :ets.new(:somelog, [:public])
    :erlang.send_after(3000, self(), :tick)

    # open FD here if some persistent_term is true

    st =
      Map.merge(options, %{
        ets: ets,
        counter: 0,
        monitors: [],
        last_add: :os.system_time(1000),
        name: acc_uuid
      })

    {:ok, st}
  end

  def handle_info(:tick, state) do
    if state.monitors == [] && :os.system_time(1) > state.last_add + 60 * 60 do
      {:stop, :normal, state}
    else
      :erlang.send_after(30000, self(), :tick)
      {:noreply, state}
    end
  end

  def handle_info({:add_line, line, side}, state) do
    state = %{state | counter: state.counter + 1, last_add: :os.system_time(1000)}

    if state.counter > 5000 do
      :ets.delete(state.ets, state.counter - 5000)
    end

    :ets.insert(state.ets, {state.counter, state.last_add, side, line})

    Enum.each(state.monitors, fn {pid, _} ->
      send(pid, {:log_notification, state.counter, line})
    end)

    # write line to FD here if some persistent_term is true

    {:noreply, state}
  end

  def handle_call(:get_lines, caller, state) do
    lines = :ets.tab2list(state.ets)
    {:reply, lines, state}
  end

  def handle_info({:DOWN, ref, :process, pid, _}, state) do
    state = %{state | monitors: Enum.reject(state.monitors, fn {p, _} -> pid == p end)}
    {:noreply, state}
  end

  def handle_call(:watch, {pid, _} = caller, state) do
    ref = Process.monitor(pid)
    state = %{state | monitors: [{pid, ref} | state.monitors]}
    {:reply, :ok, state}
  end

  def add_line(log, line, side \\ "note") do
    cond do
      log == :log_mitm ->
        cond do
          is_binary(line) -> IO.puts(line)
          true -> IO.inspect(line, limit: :infinity)
        end

      l = Process.whereis(log) ->
        # Mitm.Game.send_to_log(side, (if is_binary(line) do line else inspect(line) end), inspect(line))
        #
        if Process.get(:output_std_io, false) do
          if is_binary(line) do
            IO.puts(line)
          else
            IO.inspect(line, limit: :infinity)
          end
        end

        send(l, {:add_line, line, side})

      is_pid(log) ->
        send(log, {:add_line, line, side})

      true ->
        #        :ok
        IO.puts("log process doesn't exists: #{inspect(log)} #{inspect(line)}")
    end
  end

  def get_lines(log) do
    GenServer.call(log, :get_lines) |> Enum.sort_by(fn {x, _, _, _} -> x end)
  end

  def tail(log, num \\ 20) do
    name =
      if is_binary(log) do
        :"log_#{log}"
      else
        log
      end

    lines = BuffLog.get_lines(name)
    lines = Enum.drop(lines, max(0, Enum.count(lines) - num))

    Enum.each(lines, fn line ->
      if is_binary(line) do
        IO.puts(line)
      else
        IO.inspect(line, limit: :infinity)
      end
    end)
  end

  def watch(log) do
    GenServer.call(log, :watch)
  end

  def watch1() do
    receive do
      {:log_notification, _, x} when is_binary(x) ->
        IO.puts(x)
        watch1()

      {:log_notification, _, x} ->
        IO.inspect(x, limit: :infinity)
        watch1()

      :exit ->
        :ok

      msg ->
        IO.inspect(msg, limit: :infinity)
    end
  end

  def start_log(acc_uuid, options \\ %{}) do
    log_name = :"log_#{acc_uuid}"
    Process.put(:bufflog, log_name)

    if Process.whereis(log_name) == nil do
      GenServer.start(BuffLog, [acc_uuid, options], name: log_name)
    end
  end

  def add(line, side \\ "note") do
    line =
      case line do
        "->" <> _ -> IO.ANSI.color(200) <> line <> IO.ANSI.reset()
        "<-" <> _ -> IO.ANSI.light_green() <> line <> IO.ANSI.reset()
        _ when is_binary(line) -> IO.ANSI.light_yellow() <> line <> IO.ANSI.reset()
        _ -> line
      end

    add_line(Process.get(:bufflog), line, side)
  end
end