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

export async function getMergedMetadata ({ version }) {
  const metadata = await cache.get(getRedisKey({ version, name: 'mergedMetadata' }))
  if (metadata) return JSON.parse(metadata)

  await config.load()
  const newMetadata = 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
    }
  }))

  newMetadata.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
  const filtered = newMetadata.filter(Boolean)
  await cache.set(getRedisKey({ version, name: 'mergedMetadata' }), JSON.stringify(filtered))
  return filtered
}