import { test, expect, beforeAll } from 'bun:test';
import { mkdtempSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

const root = mkdtempSync(join(tmpdir(), 'ytp-retention-test-'));
process.env.DB_PATH = join(root, 'test.db');
const dbmod = await import('./db.js');
const P = await import('./p2p-db.js');

const DAY = 86400_000;
const NOW = Date.UTC(2026, 8, 29, 12);
const opts = { now: NOW, keepMinViews: 3, keepDays: 30, keepRecentDays: 14 };

beforeAll(async () => {
  await dbmod.initDb();
  await P.initP2pSchema();
  const add = (id, lastAccessDaysAgo) => dbmod.upsertMedia(id, { status: 'ready', size: 100, last_access: NOW - lastAccessDaysAgo * DAY });
  await add('topOld00001', 60);   // 5 views in window → top, but old
  await add('recent00001', 2);    // 0 views, played 2 days ago → recent
  await add('cold0000001', 40);   // 1 view in window, old → evict first-ish
  await add('cold0000002', 20);   // 0 views, 20 days → evict first
  await add('cold0000003', 50);   // 0 views, 50 days → evict first (older than cold2)
  for (let i = 0; i < 5; i++) await P.addView('topOld00001', NOW - 5 * DAY);
  await P.addView('cold0000001', NOW - 3 * DAY);
  await P.addView('cold0000002', NOW - 45 * DAY); // outside the 30-day window
});

test('non-qualifying copies go first (fewest views, then oldest); qualifying ones by LRU', async () => {
  const order = (await P.listMediaEvictionOrder(opts)).map((r) => [r.video_id, r.qualifies]);
  expect(order).toEqual([
    ['cold0000003', false],
    ['cold0000002', false],
    ['cold0000001', false],
    ['topOld00001', true],
    ['recent00001', true],
  ]);
});