defmodule Plaid.Institutions do
  @moduledoc """
  Functions for working with Plaid Institutions.

  * Return all institutions
  * Fetch an institution by id
  * Return all long-tail institutions
  * Search long-tail institutions

  Plaid API Reference: https://plaid.com/docs/api/#institutions
  """

  alias Plaid.Utilities

  defstruct [:credentials, :has_mfa, :id, :mfa, :name, :product, :type]

  @endpoint "institutions"

  @doc """
  Returns all Plaid Institutions.

  Returns the universe of institutions supported directly by Plaid. This
  endpoint requires no authentication.

  Returns a list of `Plaid.Institutions` or `Plaid.Error` struct.

  ## Example
  ```
  {:ok, [%Plaid.Institutions{...}]} = Plaid.Institutions.all()
  {:error, %Plaid.Error{...}} = Plaid.Institutions.all()
  ```
  Plaid API Reference: https://plaid.com/docs/api/#all-institutions
  """
  @spec all() :: {atom, list | map}
  def all() do
    Plaid.make_request(:get, @endpoint)
    |> Utilities.handle_plaid_response(:institutions)
  end

  @doc """
  Fetchs an institution based on the id.

  Returns a specific institution based on the id provided. This endpoint requires
  no authentication.

  Returns a `Plaid.Institutions` or `Plaid.Error` struct.

  ## Example
  ```
  {:ok, %Plaid.Institution{...}} = Plaid.Institution.id("55ccd367d32f2fdf19c1c448")
  {:error, %Plaid.Error{...}} = Plaid.Institution.id("55ccd367d32f2fdf19c1c448")
  ```
  Plaid API Reference: https://plaid.com/docs/api/#institutions-by-id
  """
  @spec id(binary) :: {atom, map}
  def id(id) do
    endpoint = @endpoint <> "/" <> id
    Plaid.make_request(:get, endpoint)
    |> Utilities.handle_plaid_response(:institutions)
  end

  @doc """
  Returns long-tail institutions.

  Returns the universe of institutions supported through Plaid's partnerships.
  Results are paginated. This endpoint requires authentication. If credentials
  are not supplied, credentials in the default configuration are used.

  Returns list of `Plaid.LongTailInstitutions` or `Plaid.Error` struct.

  The `Plaid.LongTailInstitutions` struct does not map all the data elements
  returned in the Plaid JSON response. The values ommitted are:
  * video
  * colors
  * logo
  * nameBreak

  ## Example
  ```
  cred = %{client_id: "test_id", secret: "test_secret"}

  {:ok, [%Plaid.LongTailInstitutions{...}]} = Plaid.Institutions.long_tail(50, 0)
  {:ok, [%Plaid.LongTailInstitutions{...}]} = Plaid.Institutions.long_tail(50, 0, cred)
  {:error, %Plaid.Error{...}} = Plaid.Institutions.long_tail(50, 0, cred)
  ```
  Plaid API Reference: https://plaid.com/docs/api/#all-long-tail-institutions
  """
  @spec long_tail(integer, integer, map) :: {atom, list}
  def long_tail(count, offset, cred \\ nil) do
    endpoint = @endpoint <> "/longtail"
    params = %{count: count, offset: offset}
    Plaid.make_request_with_cred(:post, endpoint, cred || Plaid.config_or_env_cred(), params)
    |> Utilities.handle_plaid_response(:long_tail)
  end

  @doc """
  Returns a long-tail institution based on the id.

  Returns the long-tail institution supported through Plaid's partnerships based
  on the id provided. This endpoint requires no authentication.

  The `Plaid.LongTailInstitutions` struct does not map all the data elements
  returned in the Plaid JSON response. The values ommitted are:
  * video
  * colors
  * logo
  * nameBreak

  Returns a `Plaid.LongTailInstitutions` or `Plaid.Error` struct.

  ## Example
  ```
  {:ok, %Plaid.LongTailInstitutions{...}} = Plaid.Institutions.long_tail_id("wells")
  {:error, %Plaid.Error{...}} = Plaid.Institutions.long_tail_id("wells")
  ```
  Plaid API Reference: https://plaid.com/docs/api/#institution-search
  """
  @spec long_tail_id(binary) :: {atom, list}
  def long_tail_id(id) do
    params = %{id: id}
    endpoint = @endpoint <> "/search/?" <> Utilities.encode_params(params)
    Plaid.make_request(:get, endpoint)
    |> Utilities.handle_plaid_response(:long_tail)
  end

  @doc """
  Returns long-tail institutions based on query parameters.

  Returns the list of long-tail institutions supported through Plaid's
  partnerships. Long-tail institutions are queried by name using a partial
  match search and product parameter as options. This endpoint does not
  require authentication.

  The `Plaid.LongTailInstitutions` does not map all the data elements returned
  in the Plaid JSON response. The values ommitted are:
  * video
  * colors
  * logo
  * nameBreak

  Returns a list of `Plaid.LongTailInstitutions` or `Plaid.Error` struct.

  ## Example
  ```
  {:ok, [%Plaid.LongTailInstitutions{...}]} = Plaid.Institutions.long_tail_search("wells","auth")
  {:error, %Plaid.Error{...}} = Plaid.Institutions.long_tail_search("wells","auth")
  ```
  Plaid API Reference: https://plaid.com/docs/api/#institution-search
  """
  @spec long_tail_search(binary, binary | nil) :: {atom, map}
  def long_tail_search(query, product \\ nil) do
    params =
      case {query, product} do
        {query, nil} ->
          %{q: query}
        _ ->
          %{q: query, p: product}
      end
    endpoint = @endpoint <> "/search/?" <> Utilities.encode_params(params)
    Plaid.make_request(:get, endpoint)
    |> Utilities.handle_plaid_response(:long_tail)
  end

end

defmodule Plaid.Institutions.Credentials do
  @moduledoc false
  defstruct [:username, :password, :pin]
end