/**
 * localSession.ts + bootGuards.ts — unit tests for JWT session cookie helpers
 * and assertLocalSessionSecretSet boot guard.
 *
 * Uses Hono test app for cookie round-trips. All tests run without MariaDB.
 *
 * Test suite (TDD RED → GREEN — Plan 19-01 Task 2):
 *   Test 1: issue then verify round-trips userId
 *   Test 2: verifyLocalSessionCookie returns null when no local-session cookie present (no throw)
 *   Test 3: verifyLocalSessionCookie returns null for a tampered/garbage token (no throw)
 *   Test 4: assertLocalSessionSecretSet does NOT exit when DEV_AUTH_BYPASS='true' even if secret unset
 */

import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import { Hono } from 'hono';

// ── Test constants ─────────────────────────────────────────────────────────────
const TEST_SECRET = 'test-secret-that-is-at-least-32-characters-long-for-jwt';
const TEST_USER_ID = 42;

// ── Helpers ────────────────────────────────────────────────────────────────────

/** Create a minimal Hono test app with an issue route and a verify route. */
function makeTestApp(secret: string | undefined) {
  return {
    setup: async () => {
      // Import inside function to pick up modified env
      const { issueLocalSessionCookie, verifyLocalSessionCookie } = await import(
        '../../src/auth/localSession.js'
      );
      const app = new Hono();

      app.post('/issue', async (c) => {
        await issueLocalSessionCookie(c, TEST_USER_ID);
        return c.json({ ok: true });
      });

      app.get('/verify', async (c) => {
        const userId = await verifyLocalSessionCookie(c);
        return c.json({ userId });
      });

      return app;
    },
  };
}

describe('issueLocalSessionCookie / verifyLocalSessionCookie', () => {
  let originalEnv: NodeJS.ProcessEnv;

  beforeEach(() => {
    originalEnv = { ...process.env };
    process.env.LOCAL_SESSION_SECRET = TEST_SECRET;
    vi.resetModules(); // ensure fresh imports pick up env changes
  });

  afterEach(() => {
    process.env = originalEnv;
    vi.resetModules();
  });

  it('Test 1: issue then verify round-trips userId', async () => {
    const { issueLocalSessionCookie, verifyLocalSessionCookie } = await import(
      '../../src/auth/localSession.js'
    );
    const app = new Hono();

    app.post('/issue', async (c) => {
      await issueLocalSessionCookie(c, TEST_USER_ID);
      return c.json({ ok: true });
    });

    app.get('/verify', async (c) => {
      const userId = await verifyLocalSessionCookie(c);
      return c.json({ userId });
    });

    // Issue cookie
    const issueRes = await app.request('/issue', { method: 'POST' });
    expect(issueRes.status).toBe(200);

    const setCookieHeader = issueRes.headers.get('set-cookie');
    expect(setCookieHeader).not.toBeNull();
    expect(setCookieHeader).toContain('local-session=');

    // Extract cookie value and forward it for verify
    const cookieHeader = setCookieHeader?.split(';')[0]; // just name=value
    const verifyRes = await app.request('/verify', {
      headers: { cookie: cookieHeader ?? '' },
    });
    expect(verifyRes.status).toBe(200);
    const body = (await verifyRes.json()) as { userId: number | null };
    expect(body.userId).toBe(TEST_USER_ID);
  });

  it('Test 2: verifyLocalSessionCookie returns null when no local-session cookie present (no throw)', async () => {
    const { verifyLocalSessionCookie } = await import('../../src/auth/localSession.js');
    const app = new Hono();

    app.get('/verify', async (c) => {
      const userId = await verifyLocalSessionCookie(c);
      return c.json({ userId });
    });

    const res = await app.request('/verify');
    expect(res.status).toBe(200);
    const body = (await res.json()) as { userId: number | null };
    expect(body.userId).toBeNull();
  });

  it('Test 3: verifyLocalSessionCookie returns null for a tampered/garbage token (no throw)', async () => {
    const { verifyLocalSessionCookie } = await import('../../src/auth/localSession.js');
    const app = new Hono();

    app.get('/verify', async (c) => {
      const userId = await verifyLocalSessionCookie(c);
      return c.json({ userId });
    });

    // Send a garbage token — should return null without throwing
    const res = await app.request('/verify', {
      headers: { cookie: 'local-session=garbage.token.value' },
    });
    expect(res.status).toBe(200);
    const body = (await res.json()) as { userId: number | null };
    expect(body.userId).toBeNull();
  });
});

describe('assertLocalSessionSecretSet (bootGuards)', () => {
  let originalEnv: NodeJS.ProcessEnv;
  let exitSpy: ReturnType<typeof vi.spyOn>;

  beforeEach(() => {
    originalEnv = { ...process.env };
    exitSpy = vi.spyOn(process, 'exit').mockImplementation((() => {
      throw new Error('process.exit called');
    }) as never);
    vi.resetModules();
  });

  afterEach(() => {
    process.env = originalEnv;
    exitSpy.mockRestore();
    vi.resetModules();
  });

  it('Test 4: assertLocalSessionSecretSet does NOT exit when DEV_AUTH_BYPASS=true even if secret unset', async () => {
    process.env.DEV_AUTH_BYPASS = 'true';
    delete process.env.LOCAL_SESSION_SECRET;

    const { assertLocalSessionSecretSet } = await import('../../src/lib/bootGuards.js');

    // Must not throw / must not call process.exit
    expect(() => assertLocalSessionSecretSet()).not.toThrow();
    expect(exitSpy).not.toHaveBeenCalled();
  });

  it('assertLocalSessionSecretSet is exported from bootGuards', async () => {
    process.env.LOCAL_SESSION_SECRET = TEST_SECRET;
    delete process.env.DEV_AUTH_BYPASS;

    const bootGuards = await import('../../src/lib/bootGuards.js');

    // Must export the function
    expect(typeof bootGuards.assertLocalSessionSecretSet).toBe('function');
  });
});