defmodule ExTrello do
  @moduledoc """
  Provides access interface to the Trello API.
  """
  use Application

  @doc """
  false
  """
  def start(_type, _args) do
    ExTrello.Supervisor.start_link
  end

  # -------------- ExTrello Settings -------------

  @doc """
  Provides OAuth configuration settings for accessing trello server.

  The specified configuration applies globally. Use `ExTrello.configure/2`
  for setting different configurations on each processes.

  ## Examples

      ExTrello.configure(
        app_key: System.get_env("TRELLO_APP_KEY"),
        app_secret: System.get_env("TRELLO_APP_SECRET"),
        access_token: System.get_env("TRELLO_ACCESS_TOKEN"),
        access_token_secret: System.get_env("TRELLO_ACCESS_SECRET")
      )
  """

  @spec configure(Keyword.t) :: :ok
  defdelegate configure(oauth), to: ExTrello.Config, as: :set

  @doc """
  Provides OAuth configuration settings for accessing trello server.

  ## Options

    The `scope` can have one of the following values.

    * `:global` - configuration is shared for all processes.

    * `:process` - configuration is isolated for each process.

  ## Examples

      ExTrello.configure(
        :process,
        app_key: System.get_env("TRELLO_APP_KEY"),
        app_secret: System.get_env("TRELLO_APP_SECRET"),
        access_token: System.get_env("TRELLO_ACCESS_TOKEN"),
        access_token_secret: System.get_env("TRELLO_ACCESS_SECRET")
      )

  """

  @spec configure(:global | :process, Keyword.t) :: :ok
  defdelegate configure(scope, oauth), to: ExTrello.Config, as: :set

  @doc """
  Fetch all boards of authenticated user.

  ## Examples

      ExTrello.boards()
  """
  @spec boards() :: [ExTrello.Model.Board] | []
  defdelegate boards, to: ExTrello.API.Boards

  @doc """
  Fetch all boards of authenticated user.

  ## Examples

      ExTrello.boards([filter: "pinned,public", fields: "shortLink,subscribed"])

  ## Reference
  https://developers.trello.com/advanced-reference/member#get-1-members-idmember-or-username-boards
  """
  @spec boards(Keyword.t) :: [ExTrello.Model.Board] | []
  defdelegate boards(options), to: ExTrello.API.Boards


  @doc """
  Fetch all boards of given username or Trello User ID.

  ## Examples

      ExTrello.boards("trello")

  ## Reference
  https://developers.trello.com/advanced-reference/member#get-1-members-idmember-or-username-boards
  """
  @spec boards(String.t, Keyword.t) :: [ExTrello.Model.Board] | []
  defdelegate boards(user, options), to: ExTrello.API.Boards

  @doc """
  Fetch board with board_id.

  ## Examples

      ExTrello.board("57663306e4b15193fcc97483")

  ## Reference
  https://developers.trello.com/advanced-reference/board#get-1-boards-board-id
  """
  @spec board(String.t) :: ExTrello.Model.Board.t | nil
  defdelegate board(id), to: ExTrello.API.Boards

  @doc """
  Fetch board with board_id. See reference for list of options.

  ## Examples

      ExTrello.board("57663306e4b15193fcc97483", [actions_display: true])

  ## Reference
  https://developers.trello.com/advanced-reference/board#get-1-boards-board-id
  """

  @spec board(String.t, Keyword.t) :: ExTrello.Model.Board.t | nil
  defdelegate board(id, options), to: ExTrello.API.Boards

  @doc """
  Create board with supplied `name`.

  ## Examples
      # Bad
      ExTrello.create_board(123) #=> %ExTrello.Error{code: 422, message: "You must provide a name with a length between 1 and 16384 to create a board."}

      # Good
      ExTrello.create_board("TrelloHub")


  ## Reference
  https://developers.trello.com/advanced-reference/board#post-1-boards
  """

  @spec create_board(String.t) :: ExTrello.Model.Board.t | nil
  defdelegate create_board(name), to: ExTrello.API.Boards

  @doc """
  Create board with supplied `name` & options.

  ## Examples
      # Bad
      ExTrello.create_board(123) #=> %ExTrello.Error{code: 422, message: "You must provide a name with a length between 1 and 16384 to create a board."}

      # Good
      ExTrello.create_board("TrelloHub", desc: "An application to synchronize your Trello boards with your GitHub activity.", powerups: "all")


  ## Reference
  https://developers.trello.com/advanced-reference/board#post-1-boards
  """

  @spec create_board(String.t, Keyword.t) :: ExTrello.Model.Board.t | nil
  defdelegate create_board(name, options), to: ExTrello.API.Boards

  @doc """
  Edit board with supplied field values.

  ## Examples
      # Capture the id of our newly created board.
      %ExTrello.Model.Board{id: id} = ExTrello.create_board("Some name")
      # Let's edit the name of our new board.
      ExTrello.edit_board(id, name: "Another name entirely.")

  ## Reference
  https://developers.trello.com/advanced-reference/board#put-1-boards-board-id
  """

  @spec edit_board(String.t, Keyword.t) :: ExTrello.Model.Board.t | nil
  defdelegate edit_board(id, options), to: ExTrello.API.Boards

  @doc """
  GET OAuthGetRequestToken

  ## Examples

      ExTrello.request_token("http://localhost:4000/auth/trello/callback/1234")

  ## Reference
  https://trello.com/app-key
  """

  @spec request_token(String.t) :: [ExTrello.Model.RequestToken.t]
  defdelegate request_token(return_url), to: ExTrello.API.Auth

  @doc """
  GET OAuthAuthorizeToken

  ## Examples

      token = ExTrello.request_token("http://localhost:4000/auth/trello/callback/1234")
      ExTrello.authorize_url(token.oauth_token, %{return_url: "http://localhost:4000/auth/trello/callback/1234", scope: "read,write", expiration: "never", name: "Example Authentication"})

  Returns the URL you should redirect the user to for authorization
  """
  @spec authorize_url(String.t, Map.t) :: {:ok, String.t} | {:error, String.t}
  defdelegate authorize_url(oauth_token, options), to: ExTrello.API.Auth

  @doc """
  GET OAuthAuthorizeToken

  ## Examples

      token = ExTrello.request_token
      ExTrello.authorize_url(token.oauth_token)

  Returns the URL you should redirect the user to for authorization
  """
  @spec authorize_url(String.t) :: {:ok, String.t} | {:error, String.t}
  defdelegate authorize_url(oauth_token), to: ExTrello.API.Auth

  @doc """
  GET OAuthGetAccessToken

  ## Examples

      ExTrello.access_token("OAUTH_VERIFIER", "OAUTH_TOKEN", "OAUTH_TOKEN_SECRET")
  """
  @spec access_token(String.t, String.t, String.t) :: {:ok, String.t} | {:error, String.t}
  defdelegate access_token(verifier, request_token, request_token_secret), to: ExTrello.API.Auth

end