1 files changed, 178 insertions, 0 deletions
diff --git a/lib/lsg_matrix/room.ex b/lib/lsg_matrix/room.ex
new file mode 100644
index 0000000..31d1b06
--- /dev/null
+++ b/lib/lsg_matrix/room.ex
@@ -0,0 +1,178 @@
+defmodule LSG.Matrix.Room do
+  require Logger
+  alias LSG.Matrix
+  alias Polyjuice.Client
+  import Matrix, only: [client: 0, client: 1, user_name: 1, myself?: 1]
+
+  defmodule Supervisor do
+    use DynamicSupervisor
+
+    def start_link() do
+      DynamicSupervisor.start_link(__MODULE__, [], name: __MODULE__)
+    end
+
+    def start_child(room_id) do
+      spec = %{id: room_id, start: {LSG.Matrix.Room, :start_link, [room_id]}, restart: :transient}
+      DynamicSupervisor.start_child(__MODULE__, spec)
+    end
+
+    @impl true
+    def init(_init_arg) do
+      DynamicSupervisor.init(
+        strategy: :one_for_one,
+        max_restarts: 10,
+        max_seconds: 1
+      )
+    end
+  end
+
+  def start(room_id) do
+    __MODULE__.Supervisor.start_child(room_id)
+  end
+
+  def start_link(room_id) do
+    GenServer.start_link(__MODULE__, [room_id], name: name(room_id))
+  end
+
+  def start_and_send_matrix_event(room_id, event) do
+    pid = if pid = whereis(room_id) do
+      pid
+    else
+      case __MODULE__.start(room_id) do
+        {:ok, pid} -> pid
+        {:error, {:already_started, pid}} -> pid
+      end
+    end
+    send(pid, {:matrix_event, event})
+  end
+
+  def whereis(room_id) do
+    {:global, name} = name(room_id)
+    case :global.whereis_name(name) do
+      :undefined -> nil
+      pid -> pid
+    end
+  end
+
+  def name(room_id) do
+    {:global, {__MODULE__, room_id}}
+  end
+
+  def init([room_id]) do
+    {:ok, state} = Matrix.lookup_room(room_id)
+    Logger.metadata(matrix_room: room_id)
+
+    {:ok, _} = Registry.register(IRC.PubSub, "#{state.network}:events", plugin: __MODULE__)
+    for t <- ["messages", "triggers", "outputs", "events"] do
+      {:ok, _} = Registry.register(IRC.PubSub, "#{state.network}/#{state.channel}:#{t}", plugin: __MODULE__)
+    end
+
+    state = state
+    |> Map.put(:id, room_id)
+    Logger.info("Started Matrix room #{room_id}")
+    {:ok, state, {:continue, :update_state}}
+  end
+
+  def handle_continue(:update_state, state) do
+    {:ok, s} = Client.Room.get_state(client(), state.id)
+    members = Enum.reduce(s, [], fn(s, acc) ->
+      if s["type"] == "m.room.member" do
+        if s["content"]["membership"] == "join" do
+          [s["user_id"] | acc]
+        end
+      else
+        # XXX: The user left, remove from IRC.Memberships ?
+        acc
+      end
+    end)
+    for m <- members, do: IRC.UserTrack.joined(state.id, %{network: "matrix", nick: m, user: m, host: "matrix."}, [], true)
+
+    accounts = IRC.UserTrack.channel(state.network, state.channel)
+    |> Enum.map(fn(tuple) -> IRC.UserTrack.User.from_tuple(tuple).account end)
+    |> Enum.uniq()
+    |> Enum.each(fn(account_id) ->
+      introduce_irc_account(account_id, state)
+    end)
+
+    {:noreply, state}
+  end
+
+  def handle_info({:irc, :text, message}, state), do: handle_irc(message, state)
+  def handle_info({:irc, :out, message}, state), do: handle_irc(message, state)
+  def handle_info({:irc, :trigger, _, message}, state), do: handle_irc(message, state)
+  def handle_info({:irc, :event, event}, state), do: handle_irc(event, state)
+  def handle_info({:matrix_event, event}, state) do
+    if myself?(event.user_id) do
+      {:noreply, state}
+    else
+      handle_matrix(event, state)
+    end
+  end
+
+  def handle_irc(message = %IRC.Message{account: account}, state) do
+    unless Map.get(message.meta, :puppet) && Map.get(message.meta, :from) == self() do
+        opts = if Map.get(message.meta, :self) || is_nil(account) do
+        []
+      else
+        mxid = Matrix.get_or_create_matrix_user(account.id)
+        [user_id: mxid]
+      end
+      Client.Room.send_message(client(opts),state.id, message.text)
+    end
+    {:noreply, state}
+  end
+
+  def handle_irc(%{type: :join, account_id: account_id}, state) do
+    introduce_irc_account(account_id, state)
+    {:noreply, state}
+  end
+
+  def handle_irc(event, state) do
+    Logger.warn("Skipped irc event #{inspect event}")
+    {:noreply, state}
+  end
+
+  def handle_matrix(event = %{type: "m.room.member", user_id: user_id, content: %{"membership" => "join"}}, state) do
+    _account = get_account(event, state)
+    IRC.UserTrack.joined(state.id, %{network: "matrix", nick: user_id, user: user_id, host: "matrix."}, [], true)
+    {:noreply, state}
+  end
+
+  def handle_matrix(event = %{type: "m.room.member", user_id: user_id, content: %{"membership" => "leave"}}, state) do
+    IRC.UserTrack.parted(state.id, %{network: "matrix", nick: user_id})
+    {:noreply, state}
+  end
+
+  def handle_matrix(event = %{type: "m.room.message", user_id: user_id, content: %{"msgtype" => "m.text", "body" => text}}, state) do
+      IRC.send_message_as(get_account(event, state), state.network, state.channel, text, true)
+      {:noreply, state}
+  end
+
+  def handle_matrix(event, state) do
+    Logger.warn("Skipped matrix event #{inspect event}")
+    {:noreply, state}
+  end
+
+  def get_account(%{user_id: user_id}, %{id: id}) do
+    IRC.Account.find_by_nick("matrix", user_id)
+  end
+
+  defp introduce_irc_account(account_id, state) do
+    mxid = Matrix.get_or_create_matrix_user(account_id)
+    account = IRC.Account.get(account_id)
+    user = IRC.UserTrack.find_by_account(state.network, account)
+    base_nick = if(user, do: user.nick, else: account.name)
+    case Client.Profile.put_displayname(client(user_id: mxid), base_nick) do
+      :ok -> :ok
+      error ->
+        Logger.warn("Failed to update profile for #{mxid}: #{inspect error}")
+    end
+    case Client.Room.join(client(user_id: mxid), state.id) do
+      {:ok, _} -> :ok
+      error ->
+        Logger.warn("Failed to join room for #{mxid}: #{inspect error}")
+    end
+    :ok
+  end
+
+end