import { getRepoInfo, listRepoCommits, getRepoTreeSummary } from './giteaAdmin.js'

// In-Memory-Cache fuer Gitea-Abfragen (Commits/Groesse/Dateibaum) pro Repo.
// Wird vom Gitea-Webhook nach jedem Push invalidiert.
const cache = new Map() // key: `${repoFullName}:${kind}` -> { data, expiresAt }
const TTL_MS = 5 * 60 * 1000

async function cached(repoFullName, kind, loader) {
  const key = `${repoFullName}:${kind}`
  const hit = cache.get(key)
  if (hit && hit.expiresAt > Date.now()) return hit.data
  const data = await loader()
  cache.set(key, { data, expiresAt: Date.now() + TTL_MS })
  return data
}

export function invalidateProjectCache(repoFullName) {
  for (const key of cache.keys()) {
    if (key.startsWith(`${repoFullName}:`)) cache.delete(key)
  }
}

/** Repo-Info + letzte Commits fuer die Projekt-Detailansicht im Kundenportal. */
export async function getProjectGitInsights(project) {
  const repoFullName = project?.repoFullName
  if (!repoFullName) return { repo: null, commits: [] }

  return cached(repoFullName, 'git', async () => {
    const repo = await getRepoInfo(repoFullName)
    const commits = await listRepoCommits(repoFullName, {
      branch: repo?.defaultBranch || 'main',
      limit: 20,
    })
    return { repo, commits }
  })
}

/** Aggregierte Datei-Uebersicht (Top-Level + Groessensummen). */
export async function getProjectFileOverview(project) {
  const repoFullName = project?.repoFullName
  if (!repoFullName) return null

  return cached(repoFullName, 'files', async () => {
    const repo = await getRepoInfo(repoFullName)
    return getRepoTreeSummary(repoFullName, repo?.defaultBranch || 'main')
  })
}