const fs = require("node:fs");
const path = require("node:path");

const MIGRATION_PATH = path.resolve(
  __dirname,
  "../../../prisma/migrations/20260829120000_reimbursement_expense_policy_invoice_guard/migration.sql",
);

describe("reimbursement expense policy migration", () => {
  it("adds backward-compatible defaults before applying allowance overrides", () => {
    const source = fs.readFileSync(MIGRATION_PATH, "utf8");

    const requiresInvoiceColumn = source.indexOf(
      'ADD COLUMN "requires_invoice" BOOLEAN NOT NULL DEFAULT true',
    );
    const approvalBasisColumn = source.indexOf(
      'ADD COLUMN "asset_prior_approval_basis" TEXT',
    );
    const allowanceOverride = source.indexOf(
      'SET "requires_invoice" = false',
    );

    expect(requiresInvoiceColumn).toBeGreaterThanOrEqual(0);
    expect(approvalBasisColumn).toBeGreaterThanOrEqual(0);
    expect(allowanceOverride).toBeGreaterThan(approvalBasisColumn);
    expect(source).toContain("'travel_meal'");
    expect(source).toContain("'travel_local_transport_allowance'");
    expect(source).not.toMatch(/DROP\s+(TABLE|COLUMN)/i);
    expect(source).not.toMatch(/ALTER\s+COLUMN\s+[^;]+NOT\s+NULL/i);
  });
});