import { execSync, exec } from 'child_process'
import { isFolder } from '../files.js'
import path from 'path'

const AO_SERVER_PATH = path.join(process.env.HOME, 'ao-server')

// Returns one of: off, installed, enabled, running, synced, error
function serviceStatus() {
  if(!aoIsInstalled()) {
    return 'off'
  }
  let stdout
  try {
    stdout = execSync('systemctl status ao')
  } catch(err) {
    stdout = err.output.toString()
  }
  if(stdout.includes('Unit ao.service could not be found.')) {
    return 'installed'
  }
  const isServiceRunning = stdout.includes('Active: active (running)')
  if(isServiceRunning) return 'running'
  else if(stdout.includes('error')) return 'error' 
  else if(stdout.includes('stopped')) return 'installed'
  else if(stdout.includes('inactive (dead')) return 'installed'
  return 'off'
}

// Downloads ao-server to ~/ao-server. Returns false if it fails, which usually means the folder already exists (update instead).
export function downloadAoServer() {
  try {
    execSync('git clone http://git.coalitionofinvisiblecolleges.org:3009/autonomousorganization/ao-server.git 2>&1')
  } catch(err) {
    switch(err.code) {
      case 128:
        return false
    }
  }
  return true
}

// Return true if the ~/ao-server/.git folder exists
export function aoIsInstalled() {
  return isFolder(path.join(AO_SERVER_PATH, '.git'))
}

function installAo(version) {
  if(!version) {
    version = aoEnv('AO_VERSION')
    if(!version) {
      version = 'ao-svelte'
      setAoEnv('AO_VERSION', 'ao-svelte')
      console.log('No AO server/frontend version specified, defaulting to ao-svelte.')
    }
  }
  downloadAoServer()
}

export function updateAoServer() {
  try {
    const stdout = execSync('cd ' + AO_SERVER_PATH + ' && git pull origin main 2>&1')
    if(stdout.includes('Already up to date.')) {
      return
    }
    console.log('\nao-server was updated.')
  } catch(error) {
    console.log('git pull failed with error:', error)
  }
}

export default {
  description: 'AO server instance on this computer',
  status: serviceStatus,
  install: installAo,
  isInstalled: aoIsInstalled,
  update: updateAoServer
}