defmodule Mv.Vereinfacht.ClientTest do
  @moduledoc """
  Tests for Mv.Vereinfacht.Client.

  "Not configured" path: no HTTP. When configured we use Bypass to stub the API
  and assert on request (query params) and response parsing.
  """
  use Mv.DataCase, async: false

  alias Mv.Vereinfacht.Client

  setup do
    clear_vereinfacht_env()
    :ok
  end

  describe "create_contact/1" do
    test "returns {:error, :not_configured} when Vereinfacht is not configured" do
      member = build_member_struct()

      assert Client.create_contact(member) == {:error, :not_configured}
    end
  end

  describe "update_contact/2" do
    test "returns {:error, :not_configured} when Vereinfacht is not configured" do
      member = build_member_struct()

      assert Client.update_contact("123", member) == {:error, :not_configured}
    end
  end

  describe "find_contact_by_email/1" do
    test "returns {:error, :not_configured} when Vereinfacht is not configured" do
      assert Client.find_contact_by_email("kayley.becker@example.com") ==
               {:error, :not_configured}
    end

    @tag :bypass
    test "sends filter[isExternal]=true and filter[email]=<encoded> and returns :not_found when data is empty" do
      bypass = Bypass.open()
      base = "http://127.0.0.1:#{bypass.port}"
      set_vereinfacht_env(base)

      Bypass.expect_once(bypass, "GET", "/finance-contacts", fn conn ->
        qs = conn.query_string || ""

        assert qs =~ "filter[isExternal]=true",
               "expected query to contain filter[isExternal]=true, got: #{inspect(qs)}"

        assert qs =~ "filter[email]=",
               "expected query to contain filter[email]=..., got: #{inspect(qs)}"

        # Email should be encoded (e.g. @ as %40)
        assert qs =~ "filter[email]=test%40example.com",
               "expected filter[email] to be URL-encoded (downcased), got: #{inspect(qs)}"

        body = Jason.encode!(%{"jsonapi" => %{"version" => "1.0"}, "data" => []})

        conn
        |> Plug.Conn.put_resp_content_type("application/vnd.api+json")
        |> Plug.Conn.send_resp(200, body)
      end)

      assert Client.find_contact_by_email("  Test@Example.com  ") == {:error, :not_found}
    end

    @tag :bypass
    test "returns {:ok, id} when API returns one contact (string id)" do
      bypass = Bypass.open()
      base = "http://127.0.0.1:#{bypass.port}"
      set_vereinfacht_env(base)

      Bypass.expect_once(bypass, "GET", "/finance-contacts", fn conn ->
        body =
          Jason.encode!(%{
            "jsonapi" => %{"version" => "1.0"},
            "data" => [%{"type" => "finance-contacts", "id" => "123", "attributes" => %{}}]
          })

        conn
        |> Plug.Conn.put_resp_content_type("application/vnd.api+json")
        |> Plug.Conn.send_resp(200, body)
      end)

      assert Client.find_contact_by_email("user@example.com") == {:ok, "123"}
    end

    @tag :bypass
    test "returns {:ok, id} when API returns one contact (integer id)" do
      bypass = Bypass.open()
      base = "http://127.0.0.1:#{bypass.port}"
      set_vereinfacht_env(base)

      Bypass.expect_once(bypass, "GET", "/finance-contacts", fn conn ->
        body =
          Jason.encode!(%{
            "jsonapi" => %{"version" => "1.0"},
            "data" => [%{"type" => "finance-contacts", "id" => 456, "attributes" => %{}}]
          })

        conn
        |> Plug.Conn.put_resp_content_type("application/vnd.api+json")
        |> Plug.Conn.send_resp(200, body)
      end)

      assert Client.find_contact_by_email("other@example.com") == {:ok, "456"}
    end
  end

  defp build_member_struct do
    %{
      first_name: "Test",
      last_name: "User",
      email: "test@example.com",
      street: "Street 1",
      house_number: "2",
      postal_code: "12345",
      city: "Berlin"
    }
  end

  defp set_vereinfacht_env(base_url) do
    System.put_env("VEREINFACHT_API_URL", base_url)
    System.put_env("VEREINFACHT_API_KEY", "test-key")
    System.put_env("VEREINFACHT_CLUB_ID", "2")
  end

  defp clear_vereinfacht_env do
    System.delete_env("VEREINFACHT_API_URL")
    System.delete_env("VEREINFACHT_API_KEY")
    System.delete_env("VEREINFACHT_CLUB_ID")
  end
end