import os from 'node:os'

/**
 * Get the private IP addr of the dev machine to use as the API url.
 * This is preferred to using localhost or 0.0.0.0 because it allows
 * us to use the dev client from other devices (i.e. phones)
 * @returns {string}
 */
export function getLocalApiUrl() {
  const addresses = Object.values(os.networkInterfaces())
    .flat()
    .filter((addr) => !addr.internal)
    .filter((addr) => addr.family === 'IPv4')
    .map((addr) => addr.address)

  let address = addresses.find((addr) => addr.startsWith('192.168')) ?? addresses.at(0)

  if (address === undefined) {
    console.warn("Couldn't identify the local address for the server. falling back to localhost")
    address = 'localhost'
  }

  if (addresses.length > 1) {
    console.warn(`chose API URL ${address} from possible choices: ${addresses.join(', ')}`)
  }

  return `http://${address}:7295`
}