const {
  resolveBudgetScope,
  resolveBudgetScopeType,
  selectBudgetPoolCandidate,
} = require("../../src/services/budgetPool");

describe("budgetPool service", () => {
  it("resolves cost center scope with legal entity", () => {
    expect(
      resolveBudgetScope({
        legalEntityId: "le-1",
        costCenterId: "cc-1",
      }),
    ).toEqual({
      scopeType: "cost_center_scoped",
      departmentId: null,
      legalEntityId: "le-1",
      costCenterId: "cc-1",
    });
  });

  it("rejects mixed department and master-data dimensions", () => {
    expect(() =>
      resolveBudgetScope({
        departmentId: "dept-1",
        legalEntityId: "le-1",
      }),
    ).toThrow(/参数校验失败/);
  });

  it("prefers cost center budget over department and global budgets", () => {
    const selected = selectBudgetPoolCandidate(
      [
        { id: "global-1", department_id: null, legal_entity_id: null, cost_center_id: null },
        { id: "dept-1", department_id: "dept-a", legal_entity_id: null, cost_center_id: null },
        { id: "scope-1", department_id: null, legal_entity_id: "le-1", cost_center_id: "cc-1" },
      ],
      {
        departmentId: "dept-a",
        legalEntityId: "le-1",
        costCenterId: "cc-1",
      },
    );

    expect(selected?.id).toBe("scope-1");
    expect(resolveBudgetScopeType(selected)).toBe("cost_center_scoped");
  });

  it("falls back to legacy department budget when no scoped budget exists", () => {
    const selected = selectBudgetPoolCandidate(
      [
        { id: "global-1", department_id: null, legal_entity_id: null, cost_center_id: null },
        { id: "dept-1", department_id: "dept-a", legal_entity_id: null, cost_center_id: null },
      ],
      {
        departmentId: "dept-a",
      },
    );

    expect(selected?.id).toBe("dept-1");
  });

  it("throws when same-priority pools are ambiguous", () => {
    expect(() =>
      selectBudgetPoolCandidate(
        [
          { id: "scope-1", department_id: null, legal_entity_id: "le-1", cost_center_id: "cc-1" },
          { id: "scope-2", department_id: null, legal_entity_id: "le-1", cost_center_id: "cc-1" },
        ],
        {
          legalEntityId: "le-1",
          costCenterId: "cc-1",
        },
      ),
    ).toThrow(/参数校验失败/);
  });
});