import { BadRequestException } from "@nestjs/common";
import { selectLatestActiveFanavaranPolicy } from "./fanavaran-policy-selection";

describe("selectLatestActiveFanavaranPolicy", () => {
  const today = "2026-06-30";

  it("selects the policy with the latest EndDate when newest is first", () => {
    const selected = selectLatestActiveFanavaranPolicy(
      [
        { PolicyId: 4826286, EndDate: "1405/09/23" },
        { PolicyId: 3719458, EndDate: "1404/09/06" },
        { PolicyId: 2800731, EndDate: "1403/09/05" },
      ],
      today,
    );

    expect(selected.policyId).toBe(4826286);
    expect(selected.endDate).toBe("1405/09/23");
  });

  it("selects the policy with the latest EndDate when newest is last", () => {
    const selected = selectLatestActiveFanavaranPolicy(
      [
        { PolicyId: 2800731, EndDate: "1403/09/05" },
        { PolicyId: 3719458, EndDate: "1404/09/06" },
        { PolicyId: 4826286, EndDate: "1405/09/23" },
      ],
      today,
    );

    expect(selected.policyId).toBe(4826286);
  });

  it("rejects when no policies are returned", () => {
    expect(() => selectLatestActiveFanavaranPolicy([], today)).toThrow(
      BadRequestException,
    );
  });

  it("rejects when the latest policy is expired", () => {
    expect(() =>
      selectLatestActiveFanavaranPolicy(
        [
          { PolicyId: 3719458, EndDate: "1404/09/06" },
          { PolicyId: 2800731, EndDate: "1403/09/05" },
        ],
        today,
      ),
    ).toThrow(BadRequestException);
  });

  it("rejects when the latest policy has no valid PolicyId", () => {
    expect(() =>
      selectLatestActiveFanavaranPolicy(
        [
          { PolicyId: 3719458, EndDate: "1404/09/06" },
          { PolicyId: null, EndDate: "1405/09/23" },
        ],
        today,
      ),
    ).toThrow(BadRequestException);
  });
});