import { expect, test } from "bun:test";
import { validateAppConfig } from "../src/config.ts";

// A stale config must fail loudly. Silently ignoring a removed key leaves
// someone believing a flag still applies.
const REMOVED = [
  { key: "compatibilityDate", config: { compatibilityDate: "2026-08-02" } },
  { key: "frameworkBehaviour", config: { frameworkBehaviour: 1 } },
  { key: "functions", config: { functions: { legacyDefaultRuntime: "current" } } },
  { key: "compatibility", config: { compatibility: { legacyEmit: false } } },
];

for (const { key, config } of REMOVED) {
  test(`a config still setting "${key}" is rejected with a message naming it`, () => {
    const issues = validateAppConfig(config as never);
    const match = issues.find((issue) => issue.path === key || issue.path.startsWith(`${key}.`));

    expect(match).toBeDefined();
    expect(match!.severity).toBe("error");
    expect(match!.message.toLowerCase()).toContain("removed");
  });
}

test("a config without those keys is accepted", () => {
  const issues = validateAppConfig({} as never);

  expect(issues.filter((issue) => issue.severity === "error")).toEqual([]);
});