// Test-side IO for the sharded session cache: the on-disk form is a directory
// (envelope + one shard per provider), so tests read and write it through the
// real load/save path instead of touching a single JSON file.
import { readFile, readdir } from 'fs/promises'
import { join } from 'path'

import {
  clearLoadCacheMemo,
  loadCache,
  markCacheDirty,
  saveCache,
  sessionCacheDir,
  type SessionCache,
} from '../../src/session-cache.js'

/** The cache exactly as it is on disk, bypassing the in-process memo. */
export async function readCacheOnDisk(): Promise<SessionCache> {
  clearLoadCacheMemo()
  return loadCache()
}

/** Publish `cache`, rewriting every provider's shard. */
export async function writeCacheOnDisk(cache: SessionCache): Promise<void> {
  for (const provider of Object.keys(cache.providers)) markCacheDirty(cache, provider)
  await saveCache(cache)
  clearLoadCacheMemo()
}

/** Byte-level snapshot of the whole cache directory (names + contents). */
export async function cacheDirSnapshot(): Promise<string> {
  const dir = sessionCacheDir()
  const names = (await readdir(dir)).sort()
  const parts = await Promise.all(names.map(async name => `${name}:${await readFile(join(dir, name), 'utf-8')}`))
  return parts.join('\n')
}