import eimsConfigFactory from "./eims.config";

const REQUIRED = {
  EIMS_ENABLED: "true",
  EIMS_CLIENT_ID: "cid",
  EIMS_CLIENT_SECRET: "secret",
  EIMS_API_KEY: "apikey",
  EIMS_TIN: "0000000000",
};

const withEnv = (vars: Record<string, string | undefined>, fn: () => void) => {
  const prior: Record<string, string | undefined> = {};
  for (const [key, value] of Object.entries(vars)) {
    prior[key] = process.env[key];
    if (value === undefined) delete process.env[key];
    else process.env[key] = value;
  }
  try {
    fn();
  } finally {
    for (const [key, value] of Object.entries(prior)) {
      if (value === undefined) delete process.env[key];
      else process.env[key] = value;
    }
  }
};

describe("eims.config — private key / certificate resolution", () => {
  it("unescapes a literal \\n when the PEM was pasted without real newlines", () => {
    withEnv(
      { ...REQUIRED, EIMS_PRIVATE_KEY: "line1\\nline2", EIMS_CERTIFICATE_PATH: "/dev/null" },
      () => {
        expect(eimsConfigFactory().privateKeyPem).toBe("line1\nline2");
      },
    );
  });

  it("leaves a PEM with real newlines untouched", () => {
    withEnv(
      { ...REQUIRED, EIMS_PRIVATE_KEY: "line1\nline2", EIMS_CERTIFICATE_PATH: "/dev/null" },
      () => {
        expect(eimsConfigFactory().privateKeyPem).toBe("line1\nline2");
      },
    );
  });

  it("throws naming all three key/cert options when none are set", () => {
    withEnv(
      {
        ...REQUIRED,
        EIMS_PRIVATE_KEY_PATH: undefined,
        EIMS_PRIVATE_KEY_BASE64: undefined,
        EIMS_PRIVATE_KEY: undefined,
        EIMS_CERTIFICATE_PATH: "/dev/null",
      },
      () => {
        expect(() => eimsConfigFactory()).toThrow(
          /EIMS_PRIVATE_KEY_PATH or EIMS_PRIVATE_KEY_BASE64 or EIMS_PRIVATE_KEY/,
        );
      },
    );
  });

  it("is satisfied by any single one of the three key options", () => {
    withEnv(
      { ...REQUIRED, EIMS_PRIVATE_KEY: "x", EIMS_CERTIFICATE_PATH: "/dev/null" },
      () => {
        expect(() => eimsConfigFactory()).not.toThrow();
      },
    );
  });
});