/* eslint-env node */
/* eslint-disable import/order */
// https://github.com/bluesky-social/atproto/blob/main/services/bsky/api.js
'use strict'

//const dd = require('dd-trace')
//
//dd.tracer
//  .init()
//  .use('http2', {
//    client: true, // calls into dataplane
//    server: false,
//  })
//  .use('express', {
//    hooks: {
//      request: (span, req) => {
//        maintainXrpcResource(span, req)
//      },
//    },
//  })

// modify tracer in order to track calls to dataplane as a service with proper resource names
const DATAPLANE_PREFIX = '/bsky.Service/'
//const origStartSpan = dd.tracer._tracer.startSpan
//dd.tracer._tracer.startSpan = function (name, options) {
//  if (
//    name !== 'http.request' ||
//    options?.tags?.component !== 'http2' ||
//    !options?.tags?.['http.url']
//  ) {
//    return origStartSpan.call(this, name, options)
//  }
//  const uri = new URL(options.tags['http.url'])
//  if (!uri.pathname.startsWith(DATAPLANE_PREFIX)) {
//    return origStartSpan.call(this, name, options)
//  }
//  options.tags['service.name'] = 'dataplane-bsky'
//  options.tags['resource.name'] = uri.pathname.slice(DATAPLANE_PREFIX.length)
//  return origStartSpan.call(this, name, options)
//}

// Tracer code above must come before anything else
const assert = require('node:assert')
const cluster = require('node:cluster')
const path = require('node:path')

const bsky = require('/app/packages/bsky') // import all bsky features
const { Secp256k1Keypair } = require('/app/packages/crypto')

const main = async () => {
  const env = getEnv()
  const config = bsky.ServerConfig.readEnv()
  assert(env.serviceSigningKey, 'must set BSKY_SERVICE_SIGNING_KEY')
  const signingKey = await Secp256k1Keypair.import(env.serviceSigningKey)

// starts: involve logics in packages/dev-env/src/bsky.ts >>>>>>>>>>>>>
// Separate migration db in case migration changes some connection state that we need in the tests, e.g. "alter database ... set ..."
  const migrationDb = new bsky.Database({
      url: env.dbPostgresUrl,
      schema: env.dbPostgresSchema,
    })
  if (env.migration) {
      await migrationDb.migrateToOrThrow(env.migration)
  } else {
      await migrationDb.migrateToLatestOrThrow()
  }
  await migrationDb.close()

  const db = new bsky.Database({
      url: env.dbPostgresUrl,
      schema: env.dbPostgresSchema,
      poolSize: 10,
  })

  const dataplane = await bsky.DataPlaneServer.create(
      db,
      env.dataplanePort,
      config.didPlcUrl
  )

  const bsync = await bsky.MockBsync.create(db, env.bsyncPort)

// ends: involve logics in packages/dev-env/src/bsky.ts   <<<<<<<<<<<<<

  const server = bsky.BskyAppView.create({ config, signingKey })
// starts: involve logics in packages/dev-env/src/bsky.ts >>>>>>>>>>>>>
  const sub = new bsky.RepoSubscription({
      service: env.repoProvider,
      db,
      idResolver: dataplane.idResolver,
      background: new bsky.BackgroundQueue(db),
    })
// ends: involve logics in packages/dev-env/src/bsky.ts   <<<<<<<<<<<<<
  await server.start()
  sub.start() // involve logics in packages/dev-env/src/bsky.ts
  // Graceful shutdown (see also https://aws.amazon.com/blogs/containers/graceful-shutdowns-with-ecs/)
  const shutdown = async () => {
    await server.destroy()
    await bsync.destroy()
    await dataplane.destroy()
    await sub.destroy()
    await db.close()
  }
  process.on('SIGTERM', shutdown)
  process.on('disconnect', shutdown) // when clustering
}

const getEnv = () => ({
  serviceSigningKey: process.env.BSKY_SERVICE_SIGNING_KEY || undefined,
  dbPostgresUrl:     process.env.BSKY_DB_POSTGRES_URL     || undefined,
  dbPostgresSchema:  process.env.BSKY_DB_POSTGRES_SCHEMA  || undefined,
  dataplanePort :    maybeParseInt(process.env.BSKY_DATAPLANE_PORT)     || undefined,
  bsyncPort :        maybeParseInt(process.env.BSKY_BSYNC_PORT)         || undefined,
  migration:         process.env.ENABLE_MIGRATIONS === 'true'           || undefined,
  repoProvider:      process.env.BSKY_REPO_PROVIDER                     || undefined
})

const maybeParseInt = (str) => {
  if (!str) return
  const int = parseInt(str, 10)
  if (isNaN(int)) return
  return int
}

const maintainXrpcResource = (span, req) => {
  // Show actual xrpc method as resource rather than the route pattern
  if (span && req.originalUrl?.startsWith('/xrpc/')) {
    span.setTag(
      'resource.name',
      [
        req.method,
        path.posix.join(req.baseUrl || '', req.path || '', '/').slice(0, -1), // Ensures no trailing slash
      ]
        .filter(Boolean)
        .join(' '),
    )
  }
}

const workerCount = maybeParseInt(process.env.CLUSTER_WORKER_COUNT)

if (workerCount) {
  if (cluster.isPrimary) {
    console.log(`primary ${process.pid} is running`)
    const workers = new Set()
    for (let i = 0; i < workerCount; ++i) {
      workers.add(cluster.fork())
    }
    let teardown = false
    cluster.on('exit', (worker) => {
      workers.delete(worker)
      if (!teardown) {
        workers.add(cluster.fork()) // restart on crash
      }
    })
    process.on('SIGTERM', () => {
      teardown = true
      console.log('disconnecting workers')
      workers.forEach((w) => w.disconnect())
    })
  } else {
    console.log(`worker ${process.pid} is running`)
    main()
  }
} else {
  main() // non-clustering
}