#!/usr/bin/env node
import chalk from 'chalk'
import inquirer from 'inquirer'
import { execSync } from 'child_process'

// Import ao-cli core features
import { exitIfRoot, detectOS, updateSoftware } from './scripts/system.js'
import { checkAoEnvFile, aoEnv, setAoEnv, AO_ENV_FILE_PATH } from './scripts/settings.js'
import { unicornPortal, asciiArt, clearScreen } from './scripts/console.js'
import { welcome, exclaim, farewell, yesOrNo } from './scripts/welcome.js'
import wander from './scripts/forest.js'
import useAoMenu from './scripts/ao.js'
import aoInstallWizard, { chooseAoVersion, checkAo } from './scripts/wizard.js'
import testsMenu from './scripts/tests.js'
import { headerStyle } from './scripts/styles.js'
import { sleep, randomInt } from './scripts/util.js'
import './scripts/strings.js'

// Import AO modular features
import features, { featuresMenu } from './scripts/features/index.js'
import manual, { printManualPage, manualFolderAsMenu, AO_MANUAL_PATH } from './scripts/features/manual.js'
import aoCli from './scripts/features/ao-cli.js'

// Enable keyboard shortcut interruption of inquirer menus
import './scripts/keyboard.js'

// Prints the AO Main Menu and executes the user's choice
async function mainMenu() {
  console.log(`\n${headerStyle('AO Main Menu')}\n`)
  let mainMenuChoices = [
    'AO',
    'Alchemy',
    'Configure',
    'Manual',
    'Exit'
  ]
  let answer
  try {
    answer = await inquirer.prompt({
      name: 'main_menu',
      type: 'list',
      message: 'Please choose:',
      choices: mainMenuChoices,
      pageSize: mainMenuChoices.length
    })
  } catch(error) {
    if (error === 'EVENT_INTERRUPTED') {
      console.log('\nESC')
      answer = { main_menu: 'Exit' }
    }
  }
  let previousChoice
  switch(answer.main_menu) {
    case 'AO':
      while(await useAoMenu()) {}
      break
    case 'Alchemy':
      while(await adminMenu()) {}
      break
    case 'Configure':
      do {
        previousChoice = await featuresMenu(previousChoice)
      } while(previousChoice !== false)
      break
    case 'Manual':
      if(!manual.isInstalled()) {
        console.log("Downloading the AO manual...")
        if(manual.install()) {
          console.log("Downloaded the AO Manual from the official git repo via http and saved to", AO_MANUAL_PATH + '.')
        } else {
          console.log('Failed to download the AO manual, sorry.')
          return false
        }
      } else {
        manual.update()
      }
      await printManualPage(AO_MANUAL_PATH) // Fencepost case - print overview page
      do {
        previousChoice = await manualFolderAsMenu(AO_MANUAL_PATH, 'AO User Manual', 'Back to Main Menu', previousChoice + 1)
      } while(previousChoice !== false)
      break
    case 'Exit':
      farewell()
      await sleep(310)
      return false
  }
  return true
}

// Prints the AO Admin Menu and executes the user's choice
// Maybe Alchemy menu should be installation and update, and admin menu should be more configuration & AO member admin
async function adminMenu() {
  console.log(`\n${headerStyle('System Alchemy')}`)
  const adminChoices = [
    { name: 'Check AO install', value: 'check_AO' },
    'Update everything',
    'Update system software',
    //'Update AO',
    //{ name: 'Install AO prerequisites', value: 'prereqs' }, // move to feature module? calls installRequired()
    'AO install wizard',
    //'Switch AO target server',
    //'Switch AO database',
    'Switch AO version',
    //'Check AO service',
    //'Start/Stop AO service',
    //'Import/export state/decks',
    //'Watch logs now',
    'Tests',
    //'Update remote AOs',
    'Back to Main Menu'
  ]
  let answer
  try {
    answer = await inquirer.prompt({
      name: 'admin_menu',
      type: 'list',
      message: 'Please choose:',
      choices: adminChoices,
      pageSize: adminChoices.length,
    })
  } catch(error) {
    if (error === 'EVENT_INTERRUPTED') {
      console.log('\nESC')
      return false
    }
  }
  switch(answer.admin_menu) {
    case 'check_AO':
      await checkAo()
      break
    case 'Update everything':
      // todo: go through the stuff in wizard and system and files and see if it can be moved to feature modules so it doesn't have to go here as an exceptional upgrade case
      const featureEntries = Object.entries(features)
      for(let i = 0; i < featureEntries.length; i++) {
        const feature = featureEntries[i][1]
        console.log('feature name is', feature.name)
        const status = feature.status()
        if((feature.hasOwnProperty('isInstalled') && feature.isInstalled()) || (['installed', 'enabled', 'running', 'synced'].includes(status))) {
          console.log('Updating' + feature.name + '...')
          if(feature.hasOwnProperty('upgrade')) {
            await feature.upgrade()
          }
        }
      }
      break
    case 'Update system software':
      updateSoftware()
      break
    case 'AO install wizard':
      await aoInstallWizard()
      break
    case 'Switch AO version':
      await chooseAoVersion()
      break 
    case 'Switch AO target server':
    case 'Import/Export state/decks':
    case 'Watch logs now':
    case 'Update remote AOs':
      console.log("Not yet implemented.")
      break
    case 'Tests':
      while(await testsMenu()) {}
      break
    default:
      return false
  }
  return true
}

// Returns false if a flag means the program should now terminate
// -v Print version info
async function handleArgs(args) {
  switch (args[0]) {
    case '--version':
    case '-v':
      console.log(await aoCli.version())
      return false
    case '--interstitial':
    case '-cd':
      // Don't say a message every time or it will annoy everybody
      if(randomInt(0, 6) === 0) {
        console.log(await wander(args[1]))
      }
      return false
  }
  return true
}

// Main entry point
async function main() {
  // Print version info etc. no matter what
  const nodePath = process.argv[0]
  const aoCliPath = process.argv[1]
  const args = process.argv.slice(2)
  const shouldTerminate = !await handleArgs(args)
  if(shouldTerminate) {
    process.exit(0)
  }
  
  // No root allowed
  exitIfRoot()
  
  // Loading screen, display some quick info during the fun animation
  console.log('ao-cli v' + (await aoCli.version()))
  const DISTRO = aoEnv('DISTRO')
  if(!DISTRO) {
    setAoEnv('DISTRO', detectOS())
  }
  const friendlyEnvPath = AO_ENV_FILE_PATH.replace(/^\/home\/\w+/, '~')
  if(checkAoEnvFile()) {
    console.log(friendlyEnvPath, 'exists')
  } else {
    console.log(friendlyEnvPath, 'does not exist')
  }
  await unicornPortal(650)
  
  if(!aoEnv('AO_FIRST_RUN')) {
    clearScreen()
    asciiArt()
    console.log('\n' + exclaim(), 'It looks like this is the first time you\'re running ao-cli on this computer! ao-cli stands for Autonomous Organization-Command Line Interface.\n\nWould you like to run the AO install wizard? It will walk you through setting up an AO server instance so you can use the AO on this computer as a full node. (Press Ctrl-C at any time to exit.)\n')
    const pleaseInstall = await yesOrNo('Start the AO install wizard?', true)
    setAoEnv('AO_FIRST_RUN', true)
    if(pleaseInstall) {
      await aoInstallWizard()
    } else {
      console.log('You can start the AO install wizard at any time from the Configure menu.')
    }
  }
  
  // Main AO title screen and flavor text
  clearScreen()
  asciiArt()
  await welcome()
  
  // Main loop
  while(await mainMenu()) {}
  process.exit(0)
}

await main()