import { execSync, exec } from 'child_process'
import { isFolder } from '../files.js'
import path from 'path'
import { unlink } from 'node:fs'
import SystemServiceManager from '../services.js'

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

const aoServerServiceTemplate =
`[Unit]
Description=ao-server daemon

[Service]
WorkingDirectory=${process.env.HOME}/ao-server
ExecStart=npm run build && node --loader ts-node/esm ${process.env.HOME}/ao-server/src/server/app.ts
User=${process.env.USER}
Type=simple
Restart=on-failure
PrivateTmp=true

[Install]
WantedBy=multi-user.target`

const aoServerServiceManager = new SystemServiceManager('ao-server', aoServerServiceTemplate)

// Returns one of: off, installed, enabled, running, synced, error
function serviceStatus() {
  if(!aoIsInstalled()) {
    return 'off'
  }
  if(aoServerServiceManager.isInstalled()) {
    const isRunning = aoServerServiceManager.isRunning()
    switch(isRunning) {
      case true:
        return 'running'
      case 'error':
        return 'error'
    }
    return 'enabled'
  } else {
    return 'installed'
  }
}

// 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() {
  console.log('Updating ao-server. If you are a developer, you may be asked for your SSH key now.')
  try {
    const stdout = execSync('cd ' + AO_SERVER_PATH + ' && git pull origin main 2>&1')
    if(stdout.includes('Already up to date.')) {
      console.log('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,
  submodules: [ aoServerServiceManager ]
}