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# Copyright 2019 Hubert Chathi <hubert@uhoreg.ca>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

defmodule Polyjuice.Client.Room do
  @moduledoc """
  Room-related functions.

  """
  require Logger

  @doc """
  Send a message to a room.

  `msg` can either be anything that implements the
  `Polyjuice.Client.MsgBuilder.MsgData` protocol (which will be sent as an
  `m.message`), or a map (which specifies the full message content).

  Examples:

      Polyjuice.Client.Room.send_message(client, "text message", "!room_id")

      Polyjuice.Client.Room.send_message(
        client,
        {"message with formatting", "<i>message</i> with <b>formatting</b>"},
        "!room_id"
      )

      Polyjuice.Client.Room.send_message(
        client,
        ["Hello, ", Polyjuice.Client.MsgBuilder.mention("@world:example.com")],
        "!room_id"
      )

      Polyjuice.Client.Room.send_message(
        client,
        %{"msgtype" => "m.notice", "body" => "using full message content"},
        "!room_id"
      )

  """
  @spec send_message(
          client_api :: Polyjuice.Client.API.t(),
          room :: String.t(),
          msg :: map | Polyjuice.Client.MsgBuilder.MsgData.t()
        ) :: String.t()
  def send_message(client_api, room, msg) when is_binary(room) do
    cond do
      Polyjuice.Client.MsgBuilder.MsgData.impl_for(msg) != nil ->
        Polyjuice.Client.API.call(
          client_api,
          %Polyjuice.Client.Endpoint.PutRoomsSend{
            txn_id: Polyjuice.Client.API.transaction_id(client_api),
            room: room,
            event_type: "m.room.message",
            message: Polyjuice.Client.MsgBuilder.to_message(msg)
          }
        )

      is_map(msg) and not Map.has_key?(msg, :__struct__) ->
        Polyjuice.Client.API.call(
          client_api,
          %Polyjuice.Client.Endpoint.PutRoomsSend{
            txn_id: Polyjuice.Client.API.transaction_id(client_api),
            room: room,
            event_type: "m.room.message",
            message: msg
          }
        )

      true ->
        raise ArgumentError, message: "invalid argument msg"
    end
  end

  @doc """
  Send an event to a room.
  """
  @spec send_event(
          client_api :: Polyjuice.Client.API.t(),
          room :: String.t(),
          event_type :: String.t(),
          event :: map
        ) :: String.t()
  def send_event(client_api, room, event_type, event)
      when is_binary(event_type) and is_map(event) and is_binary(room) do
    Polyjuice.Client.API.call(
      client_api,
      %Polyjuice.Client.Endpoint.PutRoomsSend{
        txn_id: Polyjuice.Client.API.transaction_id(client_api),
        room: room,
        event_type: event_type,
        message: event
      }
    )
  end

  @doc """
  Send a state event to a room.
  """
  @spec send_state_event(
          client_api :: Polyjuice.Client.API.t(),
          room :: String.t(),
          event_type :: String.t(),
          state_key :: String.t(),
          event :: map
        ) :: String.t()
  def send_state_event(client_api, room, event_type, state_key \\ "", event)
      when is_binary(event_type) and is_binary(state_key) and is_map(event) and is_binary(room) do
    Polyjuice.Client.API.call(
      client_api,
      %Polyjuice.Client.Endpoint.PutRoomsState{
        room: room,
        event_type: event_type,
        state_key: state_key,
        content: event
      }
    )
  end

  @doc """
  Update the client's read receipt (of the given type) to the given message in the
  given room.
  """
  @spec update_read_receipt(
          client_api :: Polyjuice.Client.API.t(),
          room :: String.t(),
          event_id :: String.t(),
          receipt_type :: String.t()
        ) :: Any
  def update_read_receipt(client_api, room, event_id, receipt_type \\ "m.read")
      when is_binary(room) and is_binary(event_id) and is_binary(receipt_type) do
    Polyjuice.Client.API.call(
      client_api,
      %Polyjuice.Client.Endpoint.PostRoomsReceipt{
        room: room,
        event_id: event_id,
        receipt_type: receipt_type
      }
    )
  end

  @doc """
  Join a room.
  """
  @spec join(
          client_api :: Polyjuice.Client.API.t(),
          room :: String.t(),
          servers :: list(String.t()),
          third_party_join :: map | nil
        ) :: Any
  def join(client_api, room, servers \\ [], third_party_signed \\ nil)
      when is_binary(room) and is_list(servers) and
             (is_map(third_party_signed) or third_party_signed == nil) do
    Polyjuice.Client.API.call(
      client_api,
      %Polyjuice.Client.Endpoint.PostJoin{
        room: room,
        servers: servers,
        third_party_signed: third_party_signed
      }
    )
  end
end