defmodule Mv.MembershipFees.MembershipFeeCycleTest do
  @moduledoc """
  Tests for MembershipFeeCycle resource.
  """
  use Mv.DataCase, async: true

  alias Mv.MembershipFees.MembershipFeeCycle
  alias Mv.MembershipFees.MembershipFeeType
  alias Mv.Membership.Member

  setup do
    # Create a member for testing
    {:ok, member} =
      Ash.create(Member, %{
        first_name: "Test",
        last_name: "Member",
        email: "test.member.#{System.unique_integer([:positive])}@example.com"
      })

    # Create a fee type for testing
    {:ok, fee_type} =
      Ash.create(MembershipFeeType, %{
        name: "Test Fee Type #{System.unique_integer([:positive])}",
        amount: Decimal.new("100.00"),
        interval: :monthly
      })

    %{member: member, fee_type: fee_type}
  end

  describe "create MembershipFeeCycle" do
    test "can create cycle with valid attributes", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:ok, %MembershipFeeCycle{} = cycle} = Ash.create(MembershipFeeCycle, attrs)
      assert cycle.cycle_start == ~D[2025-01-01]
      assert Decimal.equal?(cycle.amount, Decimal.new("100.00"))
      assert cycle.member_id == member.id
      assert cycle.membership_fee_type_id == fee_type.id
    end

    test "can create cycle with notes", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id,
        notes: "First payment cycle"
      }

      assert {:ok, cycle} = Ash.create(MembershipFeeCycle, attrs)
      assert cycle.notes == "First payment cycle"
    end

    test "requires cycle_start", %{member: member, fee_type: fee_type} do
      attrs = %{
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:error, error} = Ash.create(MembershipFeeCycle, attrs)
      assert error_on_field?(error, :cycle_start)
    end

    test "requires amount", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:error, error} = Ash.create(MembershipFeeCycle, attrs)
      assert error_on_field?(error, :amount)
    end

    test "requires member_id", %{fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        membership_fee_type_id: fee_type.id
      }

      assert {:error, error} = Ash.create(MembershipFeeCycle, attrs)
      assert error_on_field?(error, :member_id) or error_on_field?(error, :member)
    end

    test "requires membership_fee_type_id", %{member: member} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id
      }

      assert {:error, error} = Ash.create(MembershipFeeCycle, attrs)

      assert error_on_field?(error, :membership_fee_type_id) or
               error_on_field?(error, :membership_fee_type)
    end

    test "status defaults to :unpaid", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:ok, cycle} = Ash.create(MembershipFeeCycle, attrs)
      assert cycle.status == :unpaid
    end

    test "validates status enum values - unpaid", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id,
        status: :unpaid
      }

      assert {:ok, cycle} = Ash.create(MembershipFeeCycle, attrs)
      assert cycle.status == :unpaid
    end

    test "validates status enum values - paid", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-02-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id,
        status: :paid
      }

      assert {:ok, cycle} = Ash.create(MembershipFeeCycle, attrs)
      assert cycle.status == :paid
    end

    test "validates status enum values - suspended", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-03-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id,
        status: :suspended
      }

      assert {:ok, cycle} = Ash.create(MembershipFeeCycle, attrs)
      assert cycle.status == :suspended
    end

    test "rejects invalid status values", %{member: member, fee_type: fee_type} do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id,
        status: :cancelled
      }

      assert {:error, error} = Ash.create(MembershipFeeCycle, attrs)
      assert error_on_field?(error, :status)
    end
  end

  describe "uniqueness constraint" do
    test "cannot create duplicate cycle for same member and cycle_start", %{
      member: member,
      fee_type: fee_type
    } do
      attrs = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:ok, _cycle1} = Ash.create(MembershipFeeCycle, attrs)
      assert {:error, error} = Ash.create(MembershipFeeCycle, attrs)

      # Should fail due to uniqueness constraint
      assert is_struct(error, Ash.Error.Invalid)
    end

    test "can create cycles for same member with different cycle_start", %{
      member: member,
      fee_type: fee_type
    } do
      attrs1 = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      attrs2 = %{
        cycle_start: ~D[2025-02-01],
        amount: Decimal.new("100.00"),
        member_id: member.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:ok, _cycle1} = Ash.create(MembershipFeeCycle, attrs1)
      assert {:ok, _cycle2} = Ash.create(MembershipFeeCycle, attrs2)
    end

    test "can create cycles for different members with same cycle_start", %{fee_type: fee_type} do
      {:ok, member1} =
        Ash.create(Member, %{
          first_name: "Member",
          last_name: "One",
          email: "member.one.#{System.unique_integer([:positive])}@example.com"
        })

      {:ok, member2} =
        Ash.create(Member, %{
          first_name: "Member",
          last_name: "Two",
          email: "member.two.#{System.unique_integer([:positive])}@example.com"
        })

      attrs1 = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member1.id,
        membership_fee_type_id: fee_type.id
      }

      attrs2 = %{
        cycle_start: ~D[2025-01-01],
        amount: Decimal.new("100.00"),
        member_id: member2.id,
        membership_fee_type_id: fee_type.id
      }

      assert {:ok, _cycle1} = Ash.create(MembershipFeeCycle, attrs1)
      assert {:ok, _cycle2} = Ash.create(MembershipFeeCycle, attrs2)
    end
  end

  # Helper to check if an error occurred on a specific field
  defp error_on_field?(%Ash.Error.Invalid{} = error, field) do
    Enum.any?(error.errors, fn e ->
      case e do
        %{field: ^field} -> true
        %{fields: fields} when is_list(fields) -> field in fields
        _ -> false
      end
    end)
  end

  defp error_on_field?(_, _), do: false
end