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# Copyright 2020 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.Endpoint.GetSync do
  @moduledoc """
  Synchronize the latest events from the server

  https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-sync
  """

  @type t :: %__MODULE__{
          filter: String.t() | map() | nil,
          since: String.t() | nil,
          full_state: boolean(),
          set_presence: :offline | :online | :unavailable,
          timeout: integer | nil
        }

  defstruct [
    :filter,
    :since,
    full_state: false,
    set_presence: :online,
    timeout: 0
  ]

  defimpl Polyjuice.Client.Endpoint.Proto do
    def http_spec(%Polyjuice.Client.Endpoint.GetSync{
          filter: filter,
          since: since,
          full_state: full_state,
          set_presence: set_presence,
          timeout: timeout
        }) do
      query =
        [
          [timeout: timeout],
          if(since, do: [since: since], else: []),
          if(full_state, do: [full_state: "true"], else: []),
          case filter do
            %{} -> [filter: Jason.encode!(filter)]
            nil -> []
            _ -> [filter: filter]
          end,
          case set_presence do
            :offline -> [set_presence: "offline"]
            :unavailable -> [set_presence: "unavailable"]
            :online -> []
          end
        ]
        |> Enum.concat()

      Polyjuice.Client.Endpoint.HttpSpec.get(:r0, "sync", query: query)
    end

    def transform_http_result(req, status_code, resp_headers, body) do
      Polyjuice.Client.Endpoint.parse_response(req, status_code, resp_headers, body)
    end
  end
end