defmodule Mv.Accounts.EmailUniquenessTest do
  use Mv.DataCase, async: false

  alias Mv.Accounts
  alias Mv.Membership

  describe "Email uniqueness validation" do
    test "cannot create member with existing unlinked user email" do
      # Create a user with email
      {:ok, _user} =
        Accounts.create_user(%{
          email: "existing@example.com"
        })

      # Try to create member with same email
      result =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "existing@example.com"
        })

      assert {:error, %Ash.Error.Invalid{} = error} = result

      assert error.errors
             |> Enum.any?(fn e ->
               e.field == :email and
                 (String.contains?(e.message, "already") or String.contains?(e.message, "used"))
             end)
    end

    test "cannot create user with existing unlinked member email" do
      # Create a member with email
      {:ok, _member} =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "existing@example.com"
        })

      # Try to create user with same email
      result =
        Accounts.create_user(%{
          email: "existing@example.com"
        })

      assert {:error, %Ash.Error.Invalid{} = error} = result

      assert error.errors
             |> Enum.any?(fn e ->
               e.field == :email and
                 (String.contains?(e.message, "already") or String.contains?(e.message, "used"))
             end)
    end

    test "member email cannot be changed to an existing unlinked user email" do
      # Create a user with email
      {:ok, user} =
        Accounts.create_user(%{
          email: "existing_user@example.com"
        })

      # Create a member with different email
      {:ok, member} =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "member@example.com"
        })

      # Try to change member email to existing user email
      result =
        Membership.update_member(member, %{
          email: "existing_user@example.com"
        })

      assert {:error, %Ash.Error.Invalid{} = error} = result

      assert error.errors
             |> Enum.any?(fn e ->
               e.field == :email and
                 (String.contains?(e.message, "already") or String.contains?(e.message, "used"))
             end)
    end

    test "user email cannot be changed to an existing unlinked member email" do
      # Create a member with email
      {:ok, member} =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "existing_member@example.com"
        })

      # Create a user with different email
      {:ok, user} =
        Accounts.create_user(%{
          email: "user@example.com"
        })

      # Try to change user email to existing member email
      result =
        Accounts.update_user(user, %{
          email: "existing_member@example.com"
        })

      assert {:error, %Ash.Error.Invalid{} = error} = result

      assert error.errors
             |> Enum.any?(fn e ->
               e.field == :email and
                 (String.contains?(e.message, "already") or String.contains?(e.message, "used"))
             end)
    end

    test "member email syncs to linked user email without validation error" do
      # Create a user
      {:ok, user} =
        Accounts.create_user(%{
          email: "user@example.com"
        })

      # Create a member linked to this user
      # The override change will set member.email = user.email automatically
      {:ok, member} =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "member@example.com",
          user: %{id: user.id}
        })

      # Member email should have been overridden to user email
      # This happens through our sync mechanism, which should NOT trigger
      # the "email already used" validation because it's the same user
      {:ok, member_after_link} = Ash.get(Mv.Membership.Member, member.id)
      assert member_after_link.email == "user@example.com"
    end

    test "user email syncs to linked member without validation error" do
      # Create a member
      {:ok, member} =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "member@example.com"
        })

      # Create a user linked to this member
      # The override change will set member.email = user.email automatically
      {:ok, user} =
        Accounts.create_user(%{
          email: "user@example.com",
          member: %{id: member.id}
        })

      # Member email should have been overridden to user email
      # This happens through our sync mechanism, which should NOT trigger
      # the "email already used" validation because it's the same member
      {:ok, member_after_link} = Ash.get(Mv.Membership.Member, member.id)
      assert member_after_link.email == "user@example.com"
    end

    test "two unlinked users cannot have the same email" do
      # Create first user
      {:ok, _user1} =
        Accounts.create_user(%{
          email: "duplicate@example.com"
        })

      # Try to create second user with same email
      result =
        Accounts.create_user(%{
          email: "duplicate@example.com"
        })

      assert {:error, %Ash.Error.Invalid{}} = result
    end

    test "two unlinked members cannot have the same email (members have unique constraint)" do
      # Create first member
      {:ok, _member1} =
        Membership.create_member(%{
          first_name: "John",
          last_name: "Doe",
          email: "duplicate@example.com"
        })

      # Try to create second member with same email - should fail
      result =
        Membership.create_member(%{
          first_name: "Jane",
          last_name: "Smith",
          email: "duplicate@example.com"
        })

      assert {:error, %Ash.Error.Invalid{}} = result
      # Members DO have a unique email constraint at database level
    end
  end
end