import { describe, it, expect, beforeEach } from 'vitest';
import type Database from 'better-sqlite3';
import { initDb } from '../../src/db/schema.ts';
import type { Config } from '../../src/config.ts';
import { createLockoutService } from '../../src/services/lockout.ts';
import { recordFailure as dbRecordFailure } from '../../src/db/login-attempts.ts';

function makeConfig(overrides: Partial<Config> = {}): Config {
  return {
    port: 0,
    host: '127.0.0.1',
    jwtSecret: 'x',
    dbPath: ':memory:',
    uploadDir: '/tmp',
    logFile: '/tmp/x.log',
    maxFileSize: 0,
    baseUrl: '',
    cookieSecure: false,
    trustProxy: false,
    lockoutThreshold: 3,
    lockoutBaseSeconds: 10,
    lockoutMaxSeconds: 80,
    loginMinResponseMs: 0,
    loginRateLimitMax: 0,
    loginRateLimitWindowSeconds: 0,
    ...overrides,
  };
}

describe('lockout service', () => {
  let db: Database.Database;
  let nowMs: number;
  const now = (): Date => new Date(nowMs);

  beforeEach(() => {
    db = initDb(':memory:');
    nowMs = Date.UTC(2026, 0, 1, 0, 0, 0);
  });

  describe('check', () => {
    it('returns not-locked when no row exists', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      expect(svc.check('alice')).toEqual({ locked: false });
    });

    it('returns not-locked when locked_until is in the past', () => {
      const past = new Date(nowMs - 1000).toISOString();
      dbRecordFailure(db, 'alice', past);
      const svc = createLockoutService({ db, config: makeConfig(), now });
      expect(svc.check('alice')).toEqual({ locked: false });
    });

    it('returns locked with retry-after seconds when locked_until is in the future', () => {
      const future = new Date(nowMs + 30_000).toISOString();
      dbRecordFailure(db, 'alice', future);
      const svc = createLockoutService({ db, config: makeConfig(), now });
      expect(svc.check('alice')).toEqual({ locked: true, retryAfterSeconds: 30 });
    });

    it('rounds up sub-second remainder so retry-after is never 0', () => {
      const future = new Date(nowMs + 100).toISOString();
      dbRecordFailure(db, 'alice', future);
      const svc = createLockoutService({ db, config: makeConfig(), now });
      expect(svc.check('alice').retryAfterSeconds).toBe(1);
    });
  });

  describe('recordFailure', () => {
    it('does not lock under threshold', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      const r1 = svc.recordFailure('alice');
      expect(r1).toEqual({ locked: false, durationSeconds: 0, failedCount: 1 });
      const r2 = svc.recordFailure('alice');
      expect(r2).toEqual({ locked: false, durationSeconds: 0, failedCount: 2 });
    });

    it('locks with base duration at threshold', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      svc.recordFailure('alice');
      svc.recordFailure('alice');
      const r3 = svc.recordFailure('alice');
      expect(r3.locked).toBe(true);
      expect(r3.durationSeconds).toBe(10);
      expect(r3.failedCount).toBe(3);
    });

    it('doubles duration past threshold', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      svc.recordFailure('alice'); // 1
      svc.recordFailure('alice'); // 2
      expect(svc.recordFailure('alice').durationSeconds).toBe(10); // 3 -> base
      expect(svc.recordFailure('alice').durationSeconds).toBe(20); // 4
      expect(svc.recordFailure('alice').durationSeconds).toBe(40); // 5
      expect(svc.recordFailure('alice').durationSeconds).toBe(80); // 6 -> cap
      expect(svc.recordFailure('alice').durationSeconds).toBe(80); // 7 -> still cap
    });

    it('persists locked_until reachable via check', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      svc.recordFailure('alice');
      svc.recordFailure('alice');
      svc.recordFailure('alice');
      const status = svc.check('alice');
      expect(status.locked).toBe(true);
      expect(status.retryAfterSeconds).toBe(10);
    });
  });

  describe('recordSuccess', () => {
    it('clears the attempt row', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      svc.recordFailure('alice');
      svc.recordFailure('alice');
      svc.recordSuccess('alice');
      // Next failure starts at 1, no lock
      const r = svc.recordFailure('alice');
      expect(r.failedCount).toBe(1);
      expect(r.locked).toBe(false);
    });

    it('is a no-op for unknown username', () => {
      const svc = createLockoutService({ db, config: makeConfig(), now });
      expect(() => svc.recordSuccess('ghost')).not.toThrow();
    });
  });
});