/**
 * Admin route integration tests.
 *
 * A real Express app + in-memory SQLite DB per test suite.
 * Auth and admin middleware are mocked so we can focus on route logic.
 */
import { describe, it, expect, vi, beforeAll, afterEach } from 'vitest';
import express from 'express';
import * as http from 'http';
import { makeTestDb } from '../../test/db.js';
import { users, integrationTokens, tipViews, tipFeedback, tipScores, userProfileFeatures } from '../../db/schema.js';

// ---- in-memory DB ----
const testDb = makeTestDb();

vi.mock('../../db/index.js', () => ({ db: testDb, rawSqlite: testDb.rawSqlite }));

// Bypass auth — all requests arrive pre-authenticated as 'admin-1'
vi.mock('../../middleware/session.js', () => ({
  sessionMiddleware: (_req: express.Request, _res: express.Response, next: express.NextFunction) =>
    next(),
  requireAuth: (req: express.Request, _res: express.Response, next: express.NextFunction) => {
    (req as any).userId = 'admin-1';
    next();
  },
}));

vi.mock('../../middleware/admin.js', () => ({
  requireAdmin: (_req: express.Request, _res: express.Response, next: express.NextFunction) =>
    next(),
}));

const { adminRouter } = await import('../admin.js');

// ---- seed ----
const NOW = new Date().toISOString();
const DAY_AGO = new Date(Date.now() - 23 * 60 * 60 * 1000).toISOString();

beforeAll(async () => {
  await testDb.insert(users).values([
    { id: 'admin-1', email: 'admin@test.com', role: 'admin', consentGiven: true, consentAt: NOW, createdAt: NOW },
    { id: 'user-1', email: 'alice@test.com', role: 'user', consentGiven: true, consentAt: NOW, createdAt: NOW },
    { id: 'user-2', email: 'bob@test.com', role: 'user', consentGiven: false, createdAt: NOW },
  ]);
  await testDb.insert(integrationTokens).values([
    { id: 'tok-1', userId: 'user-1', provider: 'todoist', accessToken: 'secret', connectedAt: NOW },
  ]);
  await testDb.insert(tipViews).values([
    { id: 'tv-1', userId: 'user-1', tipId: 'tip:a', servedAt: DAY_AGO },
    { id: 'tv-2', userId: 'user-1', tipId: 'tip:b', servedAt: NOW },
    { id: 'tv-3', userId: 'user-2', tipId: 'tip:c', servedAt: NOW },
  ]);
  await testDb.insert(tipFeedback).values([
    { id: 'tf-1', userId: 'user-1', tipId: 'tip:a', action: 'done',   dwellMs:  60_000, rewardMilli: 1000, createdAt: DAY_AGO },
    { id: 'tf-2', userId: 'user-1', tipId: 'tip:b', action: 'snooze', dwellMs: null,    rewardMilli:  100, createdAt: NOW     },
  ]);
  // Seed tip_scores with two LLM models + two prompt_versions for #92.
  // tip:a (done, r=1.0)  → qwen2.5 / v1 / task
  // tip:b (snooze, r=.1) → qwen2.5 / v2 / advice
  // tip:c (no feedback)  → llama3  / v1 / task
  await testDb.insert(tipScores).values([
    { id: 'ts-1', userId: 'user-1', tipId: 'tip:a', policy: 'egreedy', servedAt: DAY_AGO,
      llmModel: 'qwen2.5:7b', promptVersion: 'v1', tipKind: 'task' },
    { id: 'ts-2', userId: 'user-1', tipId: 'tip:b', policy: 'egreedy', servedAt: NOW,
      llmModel: 'qwen2.5:7b', promptVersion: 'v2', tipKind: 'advice' },
    { id: 'ts-3', userId: 'user-2', tipId: 'tip:c', policy: 'egreedy', servedAt: NOW,
      llmModel: 'llama3:3b',  promptVersion: 'v1', tipKind: 'task' },
  ]);
});

// ---- test helpers ----
function buildApp() {
  const app = express();
  app.use(express.json());
  app.use('/api/admin', adminRouter);
  return app;
}

function call(
  server: http.Server,
  method: string,
  path: string,
  body?: unknown,
): Promise<{ status: number; body: unknown }> {
  return new Promise((resolve, reject) => {
    const { port } = server.address() as { port: number };
    const req = http.request(
      { method, hostname: '127.0.0.1', port, path, headers: { 'Content-Type': 'application/json' } },
      (res) => {
        let data = '';
        res.on('data', (c) => (data += c));
        res.on('end', () => {
          try { resolve({ status: res.statusCode!, body: JSON.parse(data) }); }
          catch { resolve({ status: res.statusCode!, body: data }); }
        });
      },
    );
    req.on('error', reject);
    if (body) req.write(JSON.stringify(body));
    req.end();
  });
}

function startServer(app: express.Application): Promise<{ server: http.Server; call: (method: string, path: string, body?: unknown) => ReturnType<typeof call> }> {
  return new Promise((resolve) => {
    const server = http.createServer(app);
    server.listen(0, () =>
      resolve({ server, call: (m, p, b) => call(server, m, p, b) }),
    );
  });
}

// ---- tests ----
describe('GET /api/admin/stats', () => {
  it('returns dau, wau, tips, reactions, user totals', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/stats');
      const b = body as Record<string, unknown>;
      expect(status).toBe(200);
      expect(typeof b.dau).toBe('number');
      expect(typeof b.wau).toBe('number');
      expect(b.tipsServedLast7d).toBeGreaterThanOrEqual(3);
      expect(b.totalUsers).toBe(3);
      expect(b.activatedUsers).toBeGreaterThanOrEqual(2);
      expect(b.reactionsLast7d).toBeDefined();
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/users', () => {
  it('returns paginated list with total', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/users?limit=10&offset=0');
      const b = body as { users: unknown[]; total: number };
      expect(status).toBe(200);
      expect(b.total).toBe(3);
      expect(b.users).toHaveLength(3);
    } finally {
      server.close();
    }
  });

  it('respects limit', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/users?limit=2&offset=0');
      const b = body as { users: unknown[]; total: number };
      expect(status).toBe(200);
      expect(b.users).toHaveLength(2);
      expect(b.total).toBe(3);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/users/:id', () => {
  it('returns user detail with integrations and tip stats', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/users/user-1');
      const b = body as {
        user: { email: string; role: string };
        integrations: { provider: string }[];
        tipsServed: number;
        recentFeedback: unknown[];
      };
      expect(status).toBe(200);
      expect(b.user.email).toBe('alice@test.com');
      expect(b.user.role).toBe('user');
      expect(b.integrations).toHaveLength(1);
      expect(b.integrations[0].provider).toBe('todoist');
      expect(b.tipsServed).toBe(2);
      expect(b.recentFeedback).toHaveLength(2);
    } finally {
      server.close();
    }
  });

  it('returns 404 for unknown user', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status } = await call('GET', '/api/admin/users/nonexistent');
      expect(status).toBe(404);
    } finally {
      server.close();
    }
  });

  it('includes profile feature views (#81 phase B)', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/users/user-1');
      expect(status).toBe(200);
      const b = body as { profile: Array<{ name: string; value: number | string | null; fresh: boolean; ageSec: number | null; ttlSec: number; description: string }> };
      expect(Array.isArray(b.profile)).toBe(true);
      // 5 features registered
      expect(b.profile.length).toBe(5);
      const names = b.profile.map((p) => p.name).sort();
      expect(names).toEqual([
        'completion_rate_30d',
        'dismiss_rate_30d',
        'mean_dwell_ms_30d',
        'preferred_hour',
        'tip_volume_30d',
      ]);
      // Read endpoint must NOT trigger compute → all rows fresh=false, ageSec=null
      for (const r of b.profile) {
        expect(r.fresh).toBe(false);
        expect(r.ageSec).toBeNull();
        expect(r.ttlSec).toBeGreaterThan(0);
        expect(r.description.length).toBeGreaterThan(0);
      }
    } finally {
      server.close();
    }
  });
});

describe('POST /api/admin/users/:id/profile/rebuild — #81 phase B', () => {
  it('recomputes profile, returns fresh values, audit-logs the action', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('POST', '/api/admin/users/user-1/profile/rebuild');
      expect(status).toBe(200);
      const b = body as { ok: boolean; profile: Array<{ name: string; value: number | null; fresh: boolean }> };
      expect(b.ok).toBe(true);
      const tipVolume = b.profile.find((r) => r.name === 'tip_volume_30d')!;
      expect(tipVolume.value).toBe(2);  // seed has tv-1 + tv-2
      expect(tipVolume.fresh).toBe(true);
    } finally {
      server.close();
    }
  });

  it('returns 404 for unknown user', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status } = await call('POST', '/api/admin/users/nonexistent/profile/rebuild');
      expect(status).toBe(404);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/audit', () => {
  it('returns list and total', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/audit');
      const b = body as { actions: unknown[]; total: number };
      expect(status).toBe(200);
      expect(Array.isArray(b.actions)).toBe(true);
      expect(typeof b.total).toBe('number');
    } finally {
      server.close();
    }
  });
});

describe('POST /api/admin/users/:id/revoke-integration', () => {
  it('removes the integration and writes an audit entry', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call(
        'POST', '/api/admin/users/user-1/revoke-integration', { provider: 'todoist' },
      );
      expect(status).toBe(200);
      expect((body as { ok: boolean }).ok).toBe(true);

      // Integration should be gone
      const detail = await call('GET', '/api/admin/users/user-1');
      expect((detail.body as { integrations: unknown[] }).integrations).toHaveLength(0);

      // Audit log should contain the action
      const audit = await call('GET', '/api/admin/audit');
      const actions = (audit.body as { actions: { action: string }[] }).actions;
      expect(actions.some((x) => x.action === 'revoke_integration')).toBe(true);
    } finally {
      server.close();
    }
  });

  it('returns 404 for non-existent integration', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status } = await call(
        'POST', '/api/admin/users/user-2/revoke-integration', { provider: 'todoist' },
      );
      expect(status).toBe(404);
    } finally {
      server.close();
    }
  });

  it('returns 400 when provider is missing', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status } = await call('POST', '/api/admin/users/user-1/revoke-integration', {});
      expect(status).toBe(400);
    } finally {
      server.close();
    }
  });

  it('returns 404 when target user does not exist', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status } = await call(
        'POST', '/api/admin/users/ghost/revoke-integration', { provider: 'todoist' },
      );
      expect(status).toBe(404);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/users — pagination', () => {
  it('offset skips rows', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const page0 = await call('GET', '/api/admin/users?limit=2&offset=0');
      const page1 = await call('GET', '/api/admin/users?limit=2&offset=2');
      const b0 = page0.body as { users: { id: string }[]; total: number };
      const b1 = page1.body as { users: { id: string }[]; total: number };
      expect(b0.users).toHaveLength(2);
      expect(b1.users).toHaveLength(1);
      // total stays constant
      expect(b0.total).toBe(3);
      expect(b1.total).toBe(3);
      // no overlap
      const ids0 = b0.users.map((u) => u.id);
      const ids1 = b1.users.map((u) => u.id);
      expect(ids0.every((id) => !ids1.includes(id))).toBe(true);
    } finally {
      server.close();
    }
  });

  it('offset beyond total returns empty users array', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/users?limit=10&offset=999');
      const b = body as { users: unknown[]; total: number };
      expect(status).toBe(200);
      expect(b.users).toHaveLength(0);
      expect(b.total).toBe(3);
    } finally {
      server.close();
    }
  });

  it('limit is capped at 200', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      // Passing a huge limit should not crash and should return at most all users
      const { status, body } = await call('GET', '/api/admin/users?limit=9999');
      const b = body as { users: unknown[] };
      expect(status).toBe(200);
      expect(b.users.length).toBeLessThanOrEqual(200);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/events', () => {
  it('returns events array and nextSince', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/events');
      const b = body as { events: unknown[]; nextSince: number };
      expect(status).toBe(200);
      expect(Array.isArray(b.events)).toBe(true);
      expect(typeof b.nextSince).toBe('number');
    } finally {
      server.close();
    }
  });
});

// ---------------------------------------------------------------------------
// Health endpoint — mock fetch so tests don't depend on running services.
// ---------------------------------------------------------------------------
describe('GET /api/admin/health', () => {
  const EXPECTED_HTTP_SERVICES = ['api', 'ml-serving', 'mlflow'] as const;
  const EXPECTED_INTERNAL = ['sqlite', 'event-bus'] as const;
  const VALID_STATUSES = new Set(['ok', 'degraded', 'down']);

  type ServiceRow = { name: string; status: string; latencyMs: number };
  type HealthBody = { ok: boolean; services: ServiceRow[]; checkedAt: string };

  function mockFetch(upServices: Set<string>) {
    // Resolve service name by port (matches defaults in config.ts).
    // Up services return HTTP 200; absent ones throw (simulates connection refused → 'down').
    vi.stubGlobal('fetch', async (url: string) => {
      const s = String(url);
      let name: string;
      if (s.includes(':8000'))      name = 'ml-serving';
      else if (s.includes(':5000')) name = 'mlflow';
      else                          name = 'api';

      if (!upServices.has(name)) throw new Error(`ECONNREFUSED ${name}`);
      return { ok: true, json: async () => ({ ok: true, status: 'healthy' }) };
    });
  }

  afterEach(() => vi.unstubAllGlobals());

  it('shape: 200, typed fields, all expected services present', async () => {
    mockFetch(new Set(['api', 'ml-serving', 'mlflow']));
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/health');
      const b = body as HealthBody;
      expect(status).toBe(200);
      expect(typeof b.ok).toBe('boolean');
      expect(Array.isArray(b.services)).toBe(true);
      expect(typeof b.checkedAt).toBe('string');
      expect(new Date(b.checkedAt).getTime()).toBeGreaterThan(0);

      const names = b.services.map((s) => s.name);
      for (const svc of [...EXPECTED_HTTP_SERVICES, ...EXPECTED_INTERNAL]) {
        expect(names).toContain(svc);
      }
      for (const svc of b.services) {
        expect(VALID_STATUSES).toContain(svc.status);
        expect(typeof svc.latencyMs).toBe('number');
      }
    } finally {
      server.close();
    }
  });

  it('ok=true when all HTTP services respond 200', async () => {
    mockFetch(new Set(['api', 'ml-serving', 'mlflow']));
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/health');
      const b = body as HealthBody;
      for (const name of EXPECTED_HTTP_SERVICES) {
        const svc = b.services.find((s) => s.name === name);
        expect(svc?.status, `${name} should be ok`).toBe('ok');
      }
      expect(b.ok).toBe(true);
    } finally {
      server.close();
    }
  });

  it('ml-serving=down and ok=false when ml-serving is unreachable', async () => {
    mockFetch(new Set(['api', 'mlflow'])); // ml-serving absent
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/health');
      const b = body as HealthBody;
      const mlSvc = b.services.find((s) => s.name === 'ml-serving');
      expect(mlSvc?.status).toBe('down');
      expect(b.ok).toBe(false);
    } finally {
      server.close();
    }
  });

  it('mlflow=down and ok=false when mlflow is unreachable', async () => {
    mockFetch(new Set(['api', 'ml-serving'])); // mlflow absent
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/health');
      const b = body as HealthBody;
      const svc = b.services.find((s) => s.name === 'mlflow');
      expect(svc?.status).toBe('down');
      expect(b.ok).toBe(false);
    } finally {
      server.close();
    }
  });

  it('sqlite and event-bus are always present regardless of HTTP service status', async () => {
    mockFetch(new Set()); // all HTTP services down
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/health');
      const b = body as HealthBody;
      expect(b.services.find((s) => s.name === 'sqlite')?.status).toBe('ok');
      expect(b.services.find((s) => s.name === 'event-bus')?.status).toBe('ok');
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/users/:id — edge cases', () => {
  it('user with no integrations and no tips has empty arrays and 0 count', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      // user-2 has no integrations and no feedback seeded
      const { status, body } = await call('GET', '/api/admin/users/user-2');
      const b = body as {
        user: { id: string };
        integrations: unknown[];
        tipsServed: number;
        recentFeedback: unknown[];
      };
      expect(status).toBe(200);
      expect(b.integrations).toHaveLength(0);
      expect(b.recentFeedback).toHaveLength(0);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/data-quality — #81 phase B.4 profile freshness', () => {
  type Body = {
    profileFreshness: Array<{
      feature: string;
      ttlSec: number;
      totalEligible: number;
      missing: number;
      stale: number;
    }>;
  };

  it('reports each registered feature once', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/data-quality');
      expect(status).toBe(200);
      const b = body as Body;
      const names = b.profileFreshness.map((r) => r.feature).sort();
      expect(names).toEqual([
        'completion_rate_30d',
        'dismiss_rate_30d',
        'mean_dwell_ms_30d',
        'preferred_hour',
        'tip_volume_30d',
      ]);
    } finally {
      server.close();
    }
  });

  it('counts eligible users (with tip_views in 30d) and flags missing rows', async () => {
    // Reset profile rows so this test is independent of any previous rebuild test
    // that may have populated rows for some users.
    await testDb.delete(userProfileFeatures);
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/data-quality');
      const b = body as Body;
      // Seed has tip_views for user-1 and user-2 within 30d → 2 eligible.
      const completion = b.profileFreshness.find((r) => r.feature === 'completion_rate_30d')!;
      expect(completion.totalEligible).toBe(2);
      // No profile rows seeded → both missing
      expect(completion.missing).toBe(2);
      expect(completion.stale).toBe(0);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/reward-analytics — #92 quality breakdowns', () => {
  type Row = {
    key: string | null;
    served: number;
    done: number;
    snooze: number;
    dismiss: number;
    avgRewardMilli: number | null;
  };
  type Body = { byModel: Row[]; byPromptVersion: Row[]; byKind: Row[] };

  it('groups tips by llm_model with reaction + reward aggregates', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { status, body } = await call('GET', '/api/admin/reward-analytics?days=30');
      expect(status).toBe(200);
      const b = body as Body;

      const qwen = b.byModel.find((r) => r.key === 'qwen2.5:7b')!;
      expect(qwen).toBeDefined();
      expect(qwen.served).toBe(2);        // tip:a + tip:b
      expect(qwen.done).toBe(1);
      expect(qwen.snooze).toBe(1);
      // avg of reward_milli: (1000 + 100) / 2 = 550
      expect(qwen.avgRewardMilli).toBeCloseTo(550, 0);

      const llama = b.byModel.find((r) => r.key === 'llama3:3b')!;
      expect(llama.served).toBe(1);
      expect(llama.done).toBe(0);
      expect(llama.avgRewardMilli).toBeNull();  // no reaction → no reward
    } finally {
      server.close();
    }
  });

  it('groups by prompt_version', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/reward-analytics?days=30');
      const b = body as Body;
      const v1 = b.byPromptVersion.find((r) => r.key === 'v1')!;
      expect(v1.served).toBe(2);  // tip:a + tip:c
      expect(v1.done).toBe(1);
      const v2 = b.byPromptVersion.find((r) => r.key === 'v2')!;
      expect(v2.served).toBe(1);
      expect(v2.snooze).toBe(1);
    } finally {
      server.close();
    }
  });

  it('groups by tip_kind', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/reward-analytics?days=30');
      const b = body as Body;
      const task = b.byKind.find((r) => r.key === 'task')!;
      expect(task.served).toBe(2);  // tip:a + tip:c
      const advice = b.byKind.find((r) => r.key === 'advice')!;
      expect(advice.served).toBe(1);
      expect(advice.snooze).toBe(1);
    } finally {
      server.close();
    }
  });
});

describe('GET /api/admin/stats — field types', () => {
  it('reactionsLast7d has correct action counts', async () => {
    const { server, call } = await startServer(buildApp());
    try {
      const { body } = await call('GET', '/api/admin/stats');
      const b = body as { reactionsLast7d: Record<string, number> };
      // We seeded 'done' and 'snooze' feedback
      expect(typeof b.reactionsLast7d['done']).toBe('number');
      expect(typeof b.reactionsLast7d['snooze']).toBe('number');
    } finally {
      server.close();
    }
  });
});