defmodule Mv.Membership.JoinRequestApprovalDomainTest do
  @moduledoc """
  Domain tests for JoinRequest approval: approve/reject and promotion to Member (Step 2).

  Asserts that approve creates one Member with mapped data, reject does not create Member,
  status rules, and idempotency. No User creation in MVP.
  """
  use Mv.DataCase, async: true

  import Ash.Expr
  require Ash.Query

  alias Mv.Fixtures
  alias Mv.Helpers.SystemActor
  alias Mv.Membership
  alias Mv.Membership.Member

  defp member_count do
    actor = SystemActor.get_system_actor()
    {:ok, members} = Membership.list_members(actor: actor)
    length(members)
  end

  describe "approve_join_request/2 – promotion to Member" do
    test "approve creates exactly one member with email, first_name, last_name from JoinRequest" do
      request =
        Fixtures.submitted_join_request_fixture(%{
          first_name: "Approved",
          last_name: "User"
        })

      count_before = member_count()
      user = Fixtures.user_with_role_fixture("normal_user")

      assert {:ok, approved} = Membership.approve_join_request(request.id, actor: user)
      assert approved.status == :approved

      assert member_count() == count_before + 1

      request_email = request.email
      [member] =
        Member
        |> Ash.Query.filter(expr(^ref(:email) == ^request_email))
        |> Ash.read!(actor: SystemActor.get_system_actor(), domain: Membership)

      assert member.email == request.email
      assert member.first_name == request.first_name
      assert member.last_name == request.last_name
    end

    test "approve does not create a User (MVP)" do
      request = Fixtures.submitted_join_request_fixture()
      user = Fixtures.user_with_role_fixture("normal_user")

      assert {:ok, _} = Membership.approve_join_request(request.id, actor: user)

      # No User should exist with this email from the approval flow
      request_email = request.email
      users_with_email =
        Mv.Accounts.User
        |> Ash.Query.filter(expr(^ref(:email) == ^request_email))
        |> Ash.read!(authorize?: false)

      assert users_with_email == []
    end
  end

  describe "reject_join_request/2" do
    test "reject does not create a member" do
      request = Fixtures.submitted_join_request_fixture()
      count_before = member_count()
      user = Fixtures.user_with_role_fixture("normal_user")

      assert {:ok, rejected} = Membership.reject_join_request(request.id, actor: user)
      assert rejected.status == :rejected
      assert rejected.rejected_at != nil

      assert member_count() == count_before
    end
  end

  describe "approve_join_request/2 – status and idempotency" do
    test "approve when status is already approved is idempotent or returns error" do
      request = Fixtures.submitted_join_request_fixture()
      user = Fixtures.user_with_role_fixture("normal_user")

      assert {:ok, _} = Membership.approve_join_request(request.id, actor: user)
      count_after_first = member_count()

      # Second approve: either {:ok, request} with no duplicate member, or {:error, _}
      result = Membership.approve_join_request(request.id, actor: user)

      if match?({:ok, _}, result) do
        assert member_count() == count_after_first
      else
        assert {:error, _} = result
      end
    end

    test "approve when status is pending_confirmation returns error" do
      token = "pending-token-#{System.unique_integer([:positive])}"
      attrs = %{
        email: "pending#{System.unique_integer([:positive])}@example.com",
        confirmation_token: token
      }
      {:ok, request} = Membership.submit_join_request(attrs, actor: nil)
      assert request.status == :pending_confirmation

      user = Fixtures.user_with_role_fixture("normal_user")
      assert {:error, _} = Membership.approve_join_request(request.id, actor: user)
    end

    test "approve when status is rejected returns error" do
      request = Fixtures.submitted_join_request_fixture()
      user = Fixtures.user_with_role_fixture("normal_user")
      assert {:ok, _} = Membership.reject_join_request(request.id, actor: user)

      assert {:error, _} = Membership.approve_join_request(request.id, actor: user)
    end
  end

  describe "approve_join_request/2 – defaults" do
    test "created member has join_date and membership_fee_type when not in form_data" do
      request = Fixtures.submitted_join_request_fixture()
      user = Fixtures.user_with_role_fixture("normal_user")

      assert {:ok, _} = Membership.approve_join_request(request.id, actor: user)

      request_email = request.email
      [member] =
        Member
        |> Ash.Query.filter(expr(^ref(:email) == ^request_email))
        |> Ash.read!(actor: SystemActor.get_system_actor(), domain: Membership)

      assert member.join_date != nil
      assert member.membership_fee_type_id != nil
    end
  end
end