import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { initDb, getDb } from '../../db/index.js';
import { getRequestAnalyticsRetentionConfig, pruneRequestAnalytics } from '../../services/request-retention.js';

const ORIGINAL_RETENTION_DAYS = process.env.REQUEST_ANALYTICS_RETENTION_DAYS;
const ORIGINAL_MAX_ROWS = process.env.REQUEST_ANALYTICS_MAX_ROWS;

function restoreEnv() {
  if (ORIGINAL_RETENTION_DAYS === undefined) {
    delete process.env.REQUEST_ANALYTICS_RETENTION_DAYS;
  } else {
    process.env.REQUEST_ANALYTICS_RETENTION_DAYS = ORIGINAL_RETENTION_DAYS;
  }

  if (ORIGINAL_MAX_ROWS === undefined) {
    delete process.env.REQUEST_ANALYTICS_MAX_ROWS;
  } else {
    process.env.REQUEST_ANALYTICS_MAX_ROWS = ORIGINAL_MAX_ROWS;
  }
}

function insertRequest(createdAt: string, marker: string) {
  getDb().prepare(`
    INSERT INTO requests (platform, model_id, key_id, status, input_tokens, output_tokens, latency_ms, error, created_at)
    VALUES ('groq', 'groq/compound', 1, 'error', 0, 0, 10, ?, ?)
  `).run(marker, createdAt);
}

describe('request analytics retention', () => {
  beforeEach(() => {
    process.env.ENCRYPTION_KEY = '0'.repeat(64);
    initDb(':memory:');
    getDb().prepare('DELETE FROM requests').run();
    restoreEnv();
  });

  afterEach(() => {
    restoreEnv();
  });

  it('uses conservative defaults when env values are absent or invalid', () => {
    delete process.env.REQUEST_ANALYTICS_RETENTION_DAYS;
    delete process.env.REQUEST_ANALYTICS_MAX_ROWS;
    expect(getRequestAnalyticsRetentionConfig()).toEqual({ retentionDays: 90, maxRows: 100000 });

    process.env.REQUEST_ANALYTICS_RETENTION_DAYS = 'bad';
    process.env.REQUEST_ANALYTICS_MAX_ROWS = '-1';
    expect(getRequestAnalyticsRetentionConfig()).toEqual({ retentionDays: 90, maxRows: 100000 });
  });

  it('deletes request analytics older than the configured retention window', () => {
    process.env.REQUEST_ANALYTICS_RETENTION_DAYS = '7';
    process.env.REQUEST_ANALYTICS_MAX_ROWS = '0';

    insertRequest('2026-05-01 00:00:00', 'old');
    insertRequest('2026-05-25 00:00:00', 'recent');

    const result = pruneRequestAnalytics({
      db: getDb(),
      force: true,
      now: new Date('2026-05-26T00:00:00Z'),
    });

    expect(result.deleted).toBe(1);
    const rows = getDb().prepare('SELECT error FROM requests ORDER BY id').all() as Array<{ error: string }>;
    expect(rows.map(row => row.error)).toEqual(['recent']);
  });

  it('keeps only the newest configured number of request rows', () => {
    process.env.REQUEST_ANALYTICS_RETENTION_DAYS = '0';
    process.env.REQUEST_ANALYTICS_MAX_ROWS = '2';

    insertRequest('2026-05-01 00:00:00', 'row-1');
    insertRequest('2026-05-02 00:00:00', 'row-2');
    insertRequest('2026-05-03 00:00:00', 'row-3');
    insertRequest('2026-05-04 00:00:00', 'row-4');

    const result = pruneRequestAnalytics({
      db: getDb(),
      force: true,
      now: new Date('2026-05-26T00:00:00Z'),
    });

    expect(result.deleted).toBe(2);
    const rows = getDb().prepare('SELECT error FROM requests ORDER BY created_at ASC').all() as Array<{ error: string }>;
    expect(rows.map(row => row.error)).toEqual(['row-3', 'row-4']);
  });
});