import { describe, it, expect } from "vitest";
import { verifyInternalServiceToken, INTERNAL_TOKEN_HEADER } from "@/src/auth/internal-token";

function headers(map: Record<string, string> = {}): { get(name: string): string | null } {
  const lower = new Map(Object.entries(map).map(([k, v]) => [k.toLowerCase(), v]));
  return { get: (name: string) => lower.get(name.toLowerCase()) ?? null };
}

describe("verifyInternalServiceToken", () => {
  it("accepts a header that matches the configured INTERNAL_TOKEN exactly", () => {
    const ok = verifyInternalServiceToken(headers({ [INTERNAL_TOKEN_HEADER]: "s3cr3t" }), {
      INTERNAL_TOKEN: "s3cr3t",
    });
    expect(ok).toBe(true);
  });

  it("rejects a mismatched token", () => {
    const ok = verifyInternalServiceToken(headers({ [INTERNAL_TOKEN_HEADER]: "wrong" }), {
      INTERNAL_TOKEN: "s3cr3t",
    });
    expect(ok).toBe(false);
  });

  it("rejects a missing header even when INTERNAL_TOKEN is configured", () => {
    const ok = verifyInternalServiceToken(headers({}), { INTERNAL_TOKEN: "s3cr3t" });
    expect(ok).toBe(false);
  });

  it("FAILS CLOSED: an unset INTERNAL_TOKEN never authenticates, even against an empty header value", () => {
    // Regression guard: quality_bridge.py sends `os.getenv("INTERNAL_TOKEN", "")`
    // -- if the edge's own INTERNAL_TOKEN were also unset, a naive `provided
    // === expected` comparison of two empty strings would wrongly authenticate.
    const ok = verifyInternalServiceToken(headers({ [INTERNAL_TOKEN_HEADER]: "" }), { INTERNAL_TOKEN: undefined });
    expect(ok).toBe(false);
  });

  it("FAILS CLOSED: an unset INTERNAL_TOKEN never authenticates even a non-empty header", () => {
    const ok = verifyInternalServiceToken(headers({ [INTERNAL_TOKEN_HEADER]: "anything" }), {
      INTERNAL_TOKEN: undefined,
    });
    expect(ok).toBe(false);
  });

  it("rejects a whitespace-only configured token (trimmed to empty)", () => {
    const ok = verifyInternalServiceToken(headers({ [INTERNAL_TOKEN_HEADER]: "   " }), { INTERNAL_TOKEN: "   " });
    expect(ok).toBe(false);
  });

  it("is case-sensitive on the header name lookup contract but tolerant of header-name casing via the HeaderLookup adapter", () => {
    const ok = verifyInternalServiceToken(headers({ "X-Internal-Token": "s3cr3t" }), { INTERNAL_TOKEN: "s3cr3t" });
    expect(ok).toBe(true);
  });
});