/**
 * Route-level tests for fleet sync endpoints introduced by PR 3.
 * Focus: auth gating on /api/fleet/sync/:resource (node_proxy only) and
 * payload validation. Service-level behavior is covered separately in
 * fleet-sync-service.test.ts.
 */
import { describe, it, expect, beforeAll, afterAll, vi } from 'vitest';
import request from 'supertest';
import jwt from 'jsonwebtoken';
import { setupTestDb, cleanupTestDb, TEST_USERNAME, TEST_JWT_SECRET } from './helpers/setupTestDb';

let tmpDir: string;
let app: import('express').Express;
let adminAuthHeader: string;
let nodeProxyAuthHeader: string;
let LicenseService: typeof import('../services/LicenseService').LicenseService;

beforeAll(async () => {
  tmpDir = await setupTestDb();
  ({ app } = await import('../index'));
  ({ LicenseService } = await import('../services/LicenseService'));
  const adminToken = jwt.sign({ username: TEST_USERNAME }, TEST_JWT_SECRET, { expiresIn: '1m' });
  adminAuthHeader = `Bearer ${adminToken}`;
  const proxyToken = jwt.sign({ scope: 'node_proxy' }, TEST_JWT_SECRET, { expiresIn: '1m' });
  nodeProxyAuthHeader = `Bearer ${proxyToken}`;
});

afterAll(() => {
  cleanupTestDb(tmpDir);
});

describe('GET /api/fleet/role', () => {
  it('returns 401 without auth', async () => {
    const res = await request(app).get('/api/fleet/role');
    expect(res.status).toBe(401);
  });

  it('returns the current role for an authenticated admin', async () => {
    const res = await request(app).get('/api/fleet/role').set('Authorization', adminAuthHeader);
    expect(res.status).toBe(200);
    expect(res.body).toEqual({ role: 'control' });
  });
});

describe('POST /api/fleet/sync/:resource auth gate', () => {
  const validRow = {
    name: 'from-control',
    node_identity: '',
    stack_pattern: null,
    max_severity: 'CRITICAL',
    block_on_deploy: 0,
    enabled: 1,
  };

  it('rejects unauthenticated callers with 401', async () => {
    const res = await request(app).post('/api/fleet/sync/scan_policies').send({ rows: [validRow] });
    expect(res.status).toBe(401);
  });

  it('rejects admin user session tokens with 403 NODE_PROXY_REQUIRED', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', adminAuthHeader)
      .send({ rows: [validRow] });
    expect(res.status).toBe(403);
    expect(res.body.code).toBe('NODE_PROXY_REQUIRED');
  });

  it('rejects unknown resources with 400', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/foo')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [] });
    expect(res.status).toBe(400);
  });

  it('rejects payloads without a rows array', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({});
    expect(res.status).toBe(400);
  });

  it('rejects rows with invalid max_severity', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [{ ...validRow, max_severity: 'GIGA' }] });
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/max_severity/);
  });

  it('rejects rows with non-flag enabled value', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [{ ...validRow, enabled: 2 }] });
    expect(res.status).toBe(400);
  });

  it('rejects payloads exceeding the row cap', async () => {
    const bigRows = Array.from({ length: 5001 }, () => validRow);
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: bigRows });
    expect(res.status).toBe(413);
  });
});

describe('GET /api/fleet/sync-status', () => {
  it('returns 401 without auth', async () => {
    const res = await request(app).get('/api/fleet/sync-status');
    expect(res.status).toBe(401);
  });

  it('returns 403 PAID_REQUIRED on community tier', async () => {
    vi.spyOn(LicenseService.getInstance(), 'getTier').mockReturnValue('community');
    const res = await request(app).get('/api/fleet/sync-status').set('Authorization', adminAuthHeader);
    expect(res.status).toBe(403);
    expect(res.body.code).toBe('PAID_REQUIRED');
    vi.restoreAllMocks();
  });

  it('returns an empty list for an admin on paid tier', async () => {
    vi.spyOn(LicenseService.getInstance(), 'getTier').mockReturnValue('paid');
    const res = await request(app).get('/api/fleet/sync-status').set('Authorization', adminAuthHeader);
    expect(res.status).toBe(200);
    expect(Array.isArray(res.body)).toBe(true);
    vi.restoreAllMocks();
  });
});

describe('POST /api/fleet/sync/:resource pushedAt protocol', () => {
  const validRow = {
    name: 'from-control',
    node_identity: '',
    stack_pattern: null,
    max_severity: 'CRITICAL' as const,
    block_on_deploy: 0,
    enabled: 1,
  };

  it('accepts payloads without pushedAt for back-compat with legacy controls', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [validRow], targetIdentity: 'https://me.example' });
    expect(res.status).toBe(200);
    expect(res.body.success).toBe(true);
  });

  it('accepts a fresh pushedAt and persists it for stale-rejection compare', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [validRow], targetIdentity: 'https://me.example', pushedAt: 1_700_000_000_000 });
    expect(res.status).toBe(200);
  });

  it('rejects a stale pushedAt with 409 STALE_SYNC_PUSH', async () => {
    // Send fresh, then send strictly-older.
    await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [validRow], targetIdentity: 'https://me.example', pushedAt: 1_800_000_000_000 });
    const stale = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [validRow], targetIdentity: 'https://me.example', pushedAt: 1_700_000_000_000 });
    expect(stale.status).toBe(409);
    expect(stale.body.code).toBe('STALE_SYNC_PUSH');
  });

  it('returns a friendly 413 SYNC_PAYLOAD_TOO_LARGE when the body exceeds the parser limit', async () => {
    // ~6 MB of padding pushes past the 5mb route-level limit. Keeps a single
    // valid row so any path that did parse would succeed; we want the parser
    // to reject before the handler runs.
    const padding = 'x'.repeat(6 * 1024 * 1024);
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [validRow], targetIdentity: 'https://me.example', pad: padding });
    expect(res.status).toBe(413);
    expect(res.body.code).toBe('SYNC_PAYLOAD_TOO_LARGE');
    expect(res.body.error).toMatch(/Sync payload too large/);
  });
});

describe('POST /api/fleet/sync/:resource control anchor', () => {
  // One ordered scenario rather than four cross-dependent it() blocks: anchor,
  // then exercise reject / legacy-empty / matching paths against the anchored
  // state. Keeps the chronology explicit so reordering or test-isolation
  // changes cannot silently break the suite.
  it('anchors on first sync, then enforces / accepts / re-allows in order', async () => {
    const reanchorRes = await request(app)
      .post('/api/fleet/role/reanchor')
      .set('Authorization', adminAuthHeader)
      .send({ override: true });
    expect(reanchorRes.status).toBe(200);

    const firstSync = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [], targetIdentity: 'https://me.example', controlIdentity: 'fingerprint-anchor1' });
    expect(firstSync.status).toBe(200);

    const mismatch = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [], targetIdentity: 'https://me.example', controlIdentity: 'fingerprint-different' });
    expect(mismatch.status).toBe(409);
    expect(mismatch.body.code).toBe('CONTROL_IDENTITY_MISMATCH');
    expect(mismatch.body.expected).toBe('fingerprint-anchor1');
    expect(mismatch.body.got).toBe('fingerprint-different');

    const legacy = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [], targetIdentity: 'https://me.example' });
    expect(legacy.status).toBe(200);

    const matching = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [], targetIdentity: 'https://me.example', controlIdentity: 'fingerprint-anchor1' });
    expect(matching.status).toBe(200);
  });
});

describe('POST /api/fleet/role/reanchor', () => {
  it('returns 401 without auth', async () => {
    const res = await request(app).post('/api/fleet/role/reanchor').send({ override: true });
    expect(res.status).toBe(401);
  });

  it('returns 400 without override:true (no accidental reanchor)', async () => {
    const res = await request(app)
      .post('/api/fleet/role/reanchor')
      .set('Authorization', adminAuthHeader)
      .send({});
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/override/);
  });

  it('clears the cached fingerprint and accepts the next push from a different control', async () => {
    // Establish a known anchor first so the assertion of "different control
    // can now write" actually proves the reanchor cleared something.
    const reanchorBefore = await request(app)
      .post('/api/fleet/role/reanchor')
      .set('Authorization', adminAuthHeader)
      .send({ override: true });
    expect(reanchorBefore.status).toBe(200);

    const anchor = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [], targetIdentity: 'https://me.example', controlIdentity: 'fingerprint-prior' });
    expect(anchor.status).toBe(200);

    const reanchor = await request(app)
      .post('/api/fleet/role/reanchor')
      .set('Authorization', adminAuthHeader)
      .send({ override: true });
    expect(reanchor.status).toBe(200);
    expect(reanchor.body.success).toBe(true);

    const next = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [], targetIdentity: 'https://me.example', controlIdentity: 'fingerprint-newcontrol' });
    expect(next.status).toBe(200);
  });
});

describe('POST /api/fleet/sync/cve_suppressions row apply', () => {
  // Existing tests in this file cover the protocol mechanics (auth, anchor,
  // stale push, reanchor, demote) for cve_suppressions with empty rows arrays.
  // These tests pin the suppression-specific pieces: actual rows replace prior
  // replicated rows, the receive path writes an audit-log entry, and a malformed
  // suppression row is rejected at the validator before any DB write.

  async function freshAnchor(): Promise<void> {
    const reanchor = await request(app)
      .post('/api/fleet/role/reanchor')
      .set('Authorization', adminAuthHeader)
      .send({ override: true });
    expect(reanchor.status).toBe(200);
  }

  it('replaces prior replicated rows on a fresh push and records an audit entry', async () => {
    await freshAnchor();
    const { DatabaseService } = await import('../services/DatabaseService');
    const db = DatabaseService.getInstance();
    // Flush prior tests' buffered audit writes BEFORE the wipe so they cannot
    // land in the table after the DELETE.
    db.flushAuditLogBuffer();
    db.getDb().prepare('DELETE FROM audit_log').run();

    const firstPush = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({
        rows: [
          {
            cve_id: 'CVE-2024-7001', pkg_name: null, image_pattern: null,
            reason: 'first push', created_by: 'control-admin',
            created_at: Date.now(), expires_at: null,
          },
          {
            cve_id: 'CVE-2024-7002', pkg_name: 'openssl', image_pattern: null,
            reason: 'first push 2', created_by: 'control-admin',
            created_at: Date.now(), expires_at: null,
          },
        ],
        targetIdentity: 'https://me.example',
        controlIdentity: 'fingerprint-rowapply',
        pushedAt: 1_900_000_000_000,
      });
    expect(firstPush.status).toBe(200);
    expect(firstPush.body.applied).toBe(2);

    let stored = db.getCveSuppressions().filter((s) => s.replicated_from_control === 1);
    expect(stored.map((s) => s.cve_id).sort()).toEqual(['CVE-2024-7001', 'CVE-2024-7002']);

    // Second push replaces, not appends.
    const secondPush = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({
        rows: [
          {
            cve_id: 'CVE-2024-7003', pkg_name: null, image_pattern: null,
            reason: 'second push', created_by: 'control-admin',
            created_at: Date.now(), expires_at: null,
          },
        ],
        targetIdentity: 'https://me.example',
        controlIdentity: 'fingerprint-rowapply',
        pushedAt: 1_900_000_000_001,
      });
    expect(secondPush.status).toBe(200);

    stored = db.getCveSuppressions().filter((s) => s.replicated_from_control === 1);
    expect(stored.map((s) => s.cve_id)).toEqual(['CVE-2024-7003']);

    db.flushAuditLogBuffer();
    const auditRows = db.getDb()
      .prepare("SELECT username, path, summary FROM audit_log WHERE path = '/api/fleet/sync/cve_suppressions' ORDER BY id")
      .all() as Array<{ username: string; path: string; summary: string }>;
    expect(auditRows.length).toBeGreaterThanOrEqual(2);
    expect(auditRows[0].username).toBe('system');
    expect(auditRows[0].summary).toContain('cve_suppressions');
    expect(auditRows[0].summary).toContain('fingerprint-rowapply');
  });

  it('rejects a malformed suppression row before touching the DB', async () => {
    await freshAnchor();
    const { DatabaseService } = await import('../services/DatabaseService');
    const db = DatabaseService.getInstance();
    const before = db.getCveSuppressions().filter((s) => s.replicated_from_control === 1).length;

    const res = await request(app)
      .post('/api/fleet/sync/cve_suppressions')
      .set('Authorization', nodeProxyAuthHeader)
      .send({
        rows: [
          { cve_id: 'not-a-cve', reason: 'invalid', created_by: 'x', created_at: Date.now() },
        ],
        targetIdentity: 'https://me.example',
        controlIdentity: 'fingerprint-malformed',
        pushedAt: 1_950_000_000_000,
      });
    expect(res.status).toBe(400);

    const after = db.getCveSuppressions().filter((s) => s.replicated_from_control === 1).length;
    expect(after).toBe(before);
  });
});

describe('POST /api/fleet/sync/:resource stack_pattern ReDoS guard', () => {
  it('rejects 4+ consecutive wildcards in a stack_pattern', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({
        rows: [{
          name: 'redos', node_identity: '', stack_pattern: 'foo****bar',
          max_severity: 'CRITICAL', block_on_deploy: 0, enabled: 1,
        }],
      });
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/4\+ consecutive wildcards/);
  });

  it('rejects more than 8 wildcards anywhere in a stack_pattern', async () => {
    const res = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({
        rows: [{
          name: 'too-many-stars', node_identity: '',
          stack_pattern: '*a*b*c*d*e*f*g*h*i*',
          max_severity: 'CRITICAL', block_on_deploy: 0, enabled: 1,
        }],
      });
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/too many wildcards/);
  });

  it('regex compiled from a max-allowed pattern matches in under 50ms on a worst-case input', () => {
    const pattern = 'a*b*c*d*e*f*g*h'; // 7 stars, allowed.
    const escaped = pattern.replace(/[.+?^${}()|[\]\\]/g, '\\$&').replace(/\*/g, '.*');
    const re = new RegExp('^' + escaped + '$');
    const target = 'a' + 'a'.repeat(2000);
    const start = Date.now();
    re.test(target);
    expect(Date.now() - start).toBeLessThan(50);
  });
});

describe('POST /api/fleet/sync/scan_policies risk-input validation', () => {
  const pushRows = (row: Record<string, unknown>) =>
    request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({ rows: [{ name: 'p', node_identity: '', stack_pattern: null, max_severity: 'CRITICAL', enabled: 1, ...row }] });

  it('rejects a non-0/1 risk-input value', async () => {
    const res = await pushRows({ block_on_deploy: 1, block_on_kev: 2 });
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/block_on_kev must be 0 or 1/);
  });

  it('rejects a blocking policy with every input off', async () => {
    const res = await pushRows({ block_on_deploy: 1, block_on_severity: 0, block_on_kev: 0, block_on_fixable: 0 });
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/at least one/i);
  });

  it('passes validation for a legacy row that omits the risk-input fields', async () => {
    // A field-less blocking row defaults to severity-only and must not be
    // rejected by the new cross-field guard (the back-compat contract).
    const res = await pushRows({ block_on_deploy: 1 });
    expect(res.body.error ?? '').not.toMatch(/at least one|must be 0 or 1/i);
  });
});

describe('POST /api/fleet/role/demote', () => {
  it('returns 401 without auth', async () => {
    const res = await request(app).post('/api/fleet/role/demote').send({ confirm: true });
    expect(res.status).toBe(401);
  });

  it('returns 400 without confirm:true', async () => {
    const res = await request(app)
      .post('/api/fleet/role/demote')
      .set('Authorization', adminAuthHeader)
      .send({});
    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/confirmation/i);
  });

  it('demotes a replica back to control, drops mirrored rows, then re-allows local writes', async () => {
    // Reanchor first so this test does not depend on whichever fingerprint
    // an earlier test left in place; then self-promote into a replica via a
    // sync push with at least one row so the demote has something to wipe.
    const reset = await request(app)
      .post('/api/fleet/role/reanchor')
      .set('Authorization', adminAuthHeader)
      .send({ override: true });
    expect(reset.status).toBe(200);

    const push = await request(app)
      .post('/api/fleet/sync/scan_policies')
      .set('Authorization', nodeProxyAuthHeader)
      .send({
        rows: [
          { name: 'mirrored-policy', node_identity: '', stack_pattern: null, max_severity: 'CRITICAL', block_on_deploy: 0, enabled: 1 },
        ],
        targetIdentity: 'https://me.example',
        controlIdentity: 'fingerprint-demote-test',
      });
    expect(push.status).toBe(200);

    const beforeRole = await request(app).get('/api/fleet/role').set('Authorization', adminAuthHeader);
    expect(beforeRole.body.role).toBe('replica');

    const demote = await request(app)
      .post('/api/fleet/role/demote')
      .set('Authorization', adminAuthHeader)
      .send({ confirm: true });
    expect(demote.status).toBe(200);
    expect(demote.body.role).toBe('control');

    const afterRole = await request(app).get('/api/fleet/role').set('Authorization', adminAuthHeader);
    expect(afterRole.body.role).toBe('control');
  });

  it('returns 409 ALREADY_CONTROL when called on a control instance', async () => {
    // Be explicit about the precondition so this test holds under --shuffle.
    const role = await request(app).get('/api/fleet/role').set('Authorization', adminAuthHeader);
    if (role.body.role !== 'control') {
      const cleanup = await request(app)
        .post('/api/fleet/role/demote')
        .set('Authorization', adminAuthHeader)
        .send({ confirm: true });
      expect(cleanup.status).toBe(200);
    }
    const res = await request(app)
      .post('/api/fleet/role/demote')
      .set('Authorization', adminAuthHeader)
      .send({ confirm: true });
    expect(res.status).toBe(409);
    expect(res.body.code).toBe('ALREADY_CONTROL');
  });
});