import { config } from './config.js'
import * as cache from './cache.js'
import { getRedisKey } from './util.js'

export async function fetchMergedMetadata () {
  const metadata = await Promise.all(config.urls.map(async url => {
    const { origin } = new URL(url)
    try {
      const response = await fetch(new URL('meta.json', origin))
      if (!response.ok) return
      return response.json()
    } catch (e) {
      // unhandled
    }
  }))

  metadata.push({
    id: 'ui-middleware',
    name: 'UI Middleware',
    buildDate: process.env.BUILD_TIMESTAMP,
    commitSha: process.env.CI_COMMIT_SHA,
    version: process.env.APP_VERSION
  })

  // only return when contains data
  return metadata.filter(Boolean)
}

export function getMergedMetadata ({ version }) {
  return cache.get(getRedisKey({ version, name: 'mergedMetadata' }), () => fetchMergedMetadata())
}