import { describe, expect, it } from "vitest";
import { EventEmitter } from "node:events";
import tls from "node:tls";
import { certificateDaysRemaining } from "./tls";
import { collectTls, type TlsConnector } from "./tls";

describe("TLS certificate date handling", () => {
  it("returns whole days remaining from a supplied clock", () => {
    const now = Date.parse("2026-01-01T12:00:00.000Z");
    expect(certificateDaysRemaining("Jan 11 12:00:00 2026 GMT", now)).toBe(10);
    expect(certificateDaysRemaining("Dec 31 12:00:00 2025 GMT", now)).toBe(-1);
  });

  it("does not turn an invalid certificate date into a score deduction", () => {
    expect(certificateDaysRemaining("not-a-certificate-date", Date.now())).toBeNull();
    expect(certificateDaysRemaining(null, Date.now())).toBeNull();
  });

  it("tries the next validated address after a failed TLS connection", async () => {
    const attempted: string[] = [];
    const connect: TlsConnector = ((options) => {
      const address = String(options.host);
      attempted.push(address);
      const socket = new EventEmitter() as EventEmitter & {
        authorized: boolean;
        authorizationError: null;
        getPeerCertificate: () => Record<string, unknown>;
        getProtocol: () => string;
        destroy: () => void;
      };
      socket.destroy = () => undefined;
      if (address === "1.1.1.1") {
        queueMicrotask(() => socket.emit("error", Object.assign(new Error("refused"), { code: "ECONNREFUSED" })));
      } else {
        socket.authorized = true;
        socket.authorizationError = null;
        socket.getProtocol = () => "TLSv1.3";
        socket.getPeerCertificate = () => ({
          subject: { CN: "example.com" },
          issuer: { CN: "Example CA" },
          subjectaltname: "DNS:example.com",
          valid_from: "Jan 01 00:00:00 2026 GMT",
          valid_to: "Jan 01 00:00:00 2027 GMT",
          fingerprint256: "AA:BB",
        });
        queueMicrotask(() => socket.emit("secureConnect"));
      }
      return socket as unknown as ReturnType<typeof tls.connect>;
    }) as TlsConnector;

    const result = await collectTls("example.com", ["1.1.1.1", "2.2.2.2"], { connect, now: Date.parse("2026-06-01T00:00:00Z") });
    expect(result).toMatchObject({ address: "2.2.2.2", protocol: "TLSv1.3", hostnameValid: true, authorized: true });
    expect(attempted).toEqual(["1.1.1.1", "2.2.2.2"]);
    expect(result.attempts).toEqual([{ address: "1.1.1.1", error: "TLS probe failed (ECONNREFUSED)." }]);
  });

  it("reports certificates that are not yet valid", async () => {
    const connect: TlsConnector = (() => {
      const socket = new EventEmitter() as EventEmitter & {
        authorized: boolean;
        authorizationError: null;
        getPeerCertificate: () => Record<string, unknown>;
        getProtocol: () => string;
        destroy: () => void;
      };
      socket.authorized = true;
      socket.authorizationError = null;
      socket.getProtocol = () => "TLSv1.3";
      socket.getPeerCertificate = () => ({
        subjectaltname: "DNS:example.com",
        valid_from: "Jul 01 00:00:00 2026 GMT",
        valid_to: "Jan 01 00:00:00 2027 GMT",
      });
      socket.destroy = () => undefined;
      queueMicrotask(() => socket.emit("secureConnect"));
      return socket as unknown as ReturnType<typeof tls.connect>;
    }) as TlsConnector;
    const result = await collectTls("example.com", ["2.2.2.2"], { connect, now: Date.parse("2026-06-01T00:00:00Z") });
    expect(result.notYetValid).toBe(true);
    expect(result.daysRemaining).toBe(214);
  });

  it("marks malformed or inverted certificate validity dates", async () => {
    const connect: TlsConnector = (() => {
      const socket = new EventEmitter() as EventEmitter & {
        authorized: boolean;
        authorizationError: null;
        getPeerCertificate: () => Record<string, unknown>;
        getProtocol: () => string;
        destroy: () => void;
      };
      socket.authorized = true;
      socket.authorizationError = null;
      socket.getProtocol = () => "TLSv1.3";
      socket.getPeerCertificate = () => ({
        subjectaltname: "DNS:example.com",
        valid_from: "Jan 02 00:00:00 2026 GMT",
        valid_to: "Jan 01 00:00:00 2026 GMT",
      });
      socket.destroy = () => undefined;
      queueMicrotask(() => socket.emit("secureConnect"));
      return socket as unknown as ReturnType<typeof tls.connect>;
    }) as TlsConnector;
    const result = await collectTls("example.com", ["2.2.2.2"], { connect, now: Date.parse("2026-01-01T00:00:00Z") });
    expect(result).toMatchObject({ validityDatesValid: false, daysRemaining: 0 });
  });

  it("marks an exhausted address set as a failed collector", async () => {
    const connect: TlsConnector = (() => {
      const socket = new EventEmitter() as EventEmitter & { destroy: () => void };
      socket.destroy = () => undefined;
      queueMicrotask(() => socket.emit("error", Object.assign(new Error("unreachable"), { code: "ETIMEDOUT" })));
      return socket as unknown as ReturnType<typeof tls.connect>;
    }) as TlsConnector;
    const result = await collectTls("example.com", ["2.2.2.2"], { connect, deadline: Date.now() + 1_000 });
    expect(result._meta).toMatchObject({ status: "failed" });
  });
});