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|
defmodule Chessh.SSH.Client do
alias IO.ANSI
require Logger
use GenServer
@clear_codes [
ANSI.clear(),
ANSI.home()
]
@min_terminal_width 64
@min_terminal_height 38
defmodule State do
defstruct tui_pid: nil,
width: 0,
height: 0,
player_session: nil,
screen_pid: nil,
screen_state_initials: []
end
def link_menu_screen(player_session) do
send(
self(),
{:set_screen_process, Chessh.SSH.Client.MainMenu,
%Chessh.SSH.Client.SelectPaginatePoller.State{player_session: player_session}}
)
end
@impl true
def init([%State{player_session: player_session} = state]) do
link_menu_screen(player_session)
{:ok, state}
end
@impl true
def handle_info(
{:set_screen_process, module, screen_state_initial},
%State{
width: width,
height: height,
screen_state_initials: screen_state_initials
} = state
) do
{:ok, new_screen_pid} =
GenServer.start_link(module, [%{screen_state_initial | client_pid: self()}])
send(new_screen_pid, {:render, width, height})
{:noreply,
%State{
state
| screen_pid: new_screen_pid,
screen_state_initials: [{module, screen_state_initial} | screen_state_initials]
}}
end
@impl true
def handle_info({:go_back_one_screen, previous_state}, %State{} = state) do
{:noreply, go_back_one_screen(state, previous_state)}
end
@impl true
def handle_info(:quit, %State{} = state) do
{:stop, :normal, state}
end
@impl true
def handle_info(msg, state) do
[burst_ms, burst_rate] =
Application.get_env(:chessh, RateLimits)
|> Keyword.take([:player_session_message_burst_ms, :player_session_message_burst_rate])
|> Keyword.values()
case Hammer.check_rate_inc(
:in_memory,
"player-session-#{state.player_session.id}-burst-message-rate",
burst_ms,
burst_rate,
1
) do
{:allow, _count} ->
handle(msg, state)
{:deny, _limit} ->
{:noreply, state}
end
end
def handle(
{:data, data},
%State{
width: width,
height: height,
screen_pid: screen_pid,
player_session: player_session
} = state
) do
case keymap(data) do
:quit ->
{:stop, :normal, state}
:previous_screen ->
GenServer.stop(screen_pid)
link_menu_screen(player_session)
{:noreply, state}
action ->
send(screen_pid, {:input, width, height, action})
{:noreply, state}
end
end
def handle(
:refresh,
%State{} = state
) do
render(state)
{:noreply, state}
end
def handle(
{:send_to_ssh, data},
%State{width: width, height: height, tui_pid: tui_pid} = state
) do
case get_terminal_dim_msg(width, height) do
{true, msg} -> send(tui_pid, {:send_data, msg})
{false, _} -> send(tui_pid, {:send_data, data})
end
{:noreply, state}
end
def handle(
{:resize, {width, height}},
%State{tui_pid: tui_pid, screen_pid: screen_pid} = state
) do
case get_terminal_dim_msg(width, height) do
{true, msg} -> send(tui_pid, {:send_data, msg})
{false, _} -> send(screen_pid, {:render, width, height})
end
{:noreply, %State{state | width: width, height: height}}
end
def keymap(key) do
case key do
# Exit keys - C-c and C-d
<<3>> -> :quit
<<4>> -> :quit
# C-b
<<2>> -> :previous_screen
# Arrow keys
"\e[A" -> :up
"\e[B" -> :down
"\e[D" -> :left
"\e[C" -> :right
"\r" -> :return
x -> x
end
end
defp get_terminal_dim_msg(width, height) do
case {height < @min_terminal_height, width < @min_terminal_width} do
{true, _} -> {true, @clear_codes ++ ["The terminal height is too small."]}
{_, true} -> {true, @clear_codes ++ ["The terminal width is too small."]}
{false, false} -> {false, nil}
end
end
defp render(%State{
tui_pid: tui_pid,
width: width,
height: height,
screen_pid: screen_pid
}) do
{out_of_range, msg} = get_terminal_dim_msg(width, height)
if out_of_range && msg do
send(tui_pid, {:send_data, msg})
else
send(screen_pid, {:render, width, height})
end
end
defp go_back_one_screen(
%State{
screen_pid: screen_pid,
screen_state_initials: [_ | rest_initial]
} = state,
previous_state
) do
[{prev_module, prev_state_initial} | _] = rest_initial
send(
self(),
{:set_screen_process, prev_module,
if(is_nil(previous_state), do: prev_state_initial, else: previous_state)}
)
if screen_pid do
GenServer.stop(screen_pid)
end
%State{state | screen_state_initials: rest_initial}
end
end
|
