const _ = require('lodash')
const commander = require('commander')
const { stripIndent } = require('common-tags')
const logSymbols = require('log-symbols')
const debug = require('debug')('cypress:cli')
const util = require('./util')
const logger = require('./logger')
const cache = require('./tasks/cache')

// patch "commander" method called when a user passed an unknown option
// we want to print help for the current command and exit with an error
function unknownOption (flag, type = 'option') {
  if (this._allowUnknownOption) return

  logger.error()
  logger.error(`  error: unknown ${type}:`, flag)
  logger.error()
  this.outputHelp()
  util.exit(1)
}
commander.Command.prototype.unknownOption = unknownOption

const coerceFalse = (arg) => {
  return arg !== 'false'
}

const spaceDelimitedSpecsMsg = (files) => {
  logger.log()
  logger.warn(stripIndent`
    ${logSymbols.warning} Warning: It looks like you're passing --spec a space-separated list of files:

    "${files.join(' ')}"

    This will work, but it's not recommended.

    The most common cause of this warning is using an unescaped glob pattern. If you are
    trying to pass a glob pattern, escape it using quotes:
      cypress run --spec "**/*.spec.js"

    If you are trying to pass multiple spec filenames, separate them by commas instead:
      cypress run --spec spec1,spec2,spec3
  `)
  logger.log()
}

const parseVariableOpts = (fnArgs, args) => {
  const opts = fnArgs.pop()

  if (fnArgs.length && opts.spec) {
    // this will capture space-delimited specs after --spec spec1 but before the next option

    const argIndex = _.indexOf(args, '--spec') + 2
    const nextOptOffset = _.findIndex(_.slice(args, argIndex), (arg) => {
      return _.startsWith(arg, '--')
    })
    const endIndex = nextOptOffset !== -1 ? argIndex + nextOptOffset : args.length

    const maybeSpecs = _.slice(args, argIndex, endIndex)
    const extraSpecs = _.intersection(maybeSpecs, fnArgs)

    if (extraSpecs.length) {
      opts.spec = [opts.spec].concat(extraSpecs)
      spaceDelimitedSpecsMsg(opts.spec)
      opts.spec = opts.spec.join(',')
    }
  }

  return parseOpts(opts)
}

const parseOpts = (opts) => {
  opts = _.pick(opts,
    'project', 'spec', 'reporter', 'reporterOptions', 'path', 'destination',
    'port', 'env', 'cypressVersion', 'config', 'record', 'key',
    'browser', 'detached', 'headed', 'global', 'dev', 'force', 'exit',
    'cachePath', 'cacheList', 'cacheClear', 'parallel', 'group', 'ciBuildId'
  )

  if (opts.exit) {
    opts = _.omit(opts, 'exit')
  }

  debug('parsed cli options', opts)

  return opts
}

const descriptions = {
  record: 'records the run. sends test results, screenshots and videos to your Cypress Dashboard.',
  key: 'your secret Record Key. you can omit this if you set a CYPRESS_RECORD_KEY environment variable.',
  spec: 'runs a specific spec file. defaults to "all"',
  reporter: 'runs a specific mocha reporter. pass a path to use a custom reporter. defaults to "spec"',
  reporterOptions: 'options for the mocha reporter. defaults to "null"',
  port: 'runs Cypress on a specific port. overrides any value in cypress.json.',
  env: 'sets environment variables. separate multiple values with a comma. overrides any value in cypress.json or cypress.env.json',
  config: 'sets configuration values. separate multiple values with a comma. overrides any value in cypress.json.',
  browserRunMode: 'runs Cypress in the browser with the given name. if a filesystem path is supplied, Cypress will attempt to use the browser at that path.',
  browserOpenMode: 'path to a custom browser to be added to the list of available browsers in Cypress',
  detached: 'runs Cypress application in detached mode',
  project: 'path to the project',
  global: 'force Cypress into global mode as if its globally installed',
  version: 'prints Cypress version',
  headed: 'displays the Electron browser instead of running headlessly',
  dev: 'runs cypress in development and bypasses binary check',
  forceInstall: 'force install the Cypress binary',
  exit: 'keep the browser open after tests finish',
  cachePath: 'print the path to the binary cache',
  cacheList: 'list cached binary versions',
  cacheClear: 'delete all cached binaries',
  group: 'a named group for recorded runs in the Cypress dashboard',
  parallel: 'enables concurrent runs and automatic load balancing of specs across multiple machines or processes',
  ciBuildId: 'the unique identifier for a run on your CI provider. typically a "BUILD_ID" env var. this value is automatically detected for most CI providers',
}

const knownCommands = ['version', 'run', 'open', 'install', 'verify', '-v', '--version', 'help', '-h', '--help', 'cache']

const text = (description) => {
  if (!descriptions[description]) {
    throw new Error(`Could not find description for: ${description}`)
  }

  return descriptions[description]
}

function includesVersion (args) {
  return _.includes(args, 'version') ||
    _.includes(args, '--version') ||
    _.includes(args, '-v')
}

function showVersions () {
  debug('printing Cypress version')

  return require('./exec/versions')
  .getVersions()
  .then((versions = {}) => {
    logger.log('Cypress package version:', versions.package)
    logger.log('Cypress binary version:', versions.binary)
    process.exit(0)
  })
  .catch(util.logErrorExit1)
}

module.exports = {
  init (args) {
    if (!args) {
      args = process.argv
    }

    const program = new commander.Command()

    // bug in commaner not printing name
    // in usage help docs
    program._name = 'cypress'

    program
    .command('help')
    .description('Shows CLI help and exits')
    .action(() => {
      program.help()
    })

    program
    .option('-v, --version', text('version'))
    .command('version')
    .description(text('version'))
    .action(showVersions)

    program
    .command('run')
    .usage('[options]')
    .description('Runs Cypress tests from the CLI without the GUI')
    .option('--record [bool]', text('record'), coerceFalse)
    .option('--headed', text('headed'))
    .option('-k, --key <record-key>', text('key'))
    .option('-s, --spec <spec>', text('spec'))
    .option('-r, --reporter <reporter>', text('reporter'))
    .option('-o, --reporter-options <reporter-options>', text('reporterOptions'))
    .option('-p, --port <port>', text('port'))
    .option('-e, --env <env>', text('env'))
    .option('-c, --config <config>', text('config'))
    .option('-b, --browser <browser-name-or-path>', text('browserRunMode'))
    .option('-P, --project <project-path>', text('project'))
    .option('--parallel', text('parallel'))
    .option('--group <name>', text('group'))
    .option('--ci-build-id <id>', text('ciBuildId'))
    .option('--no-exit', text('exit'))
    .option('--dev', text('dev'), coerceFalse)
    .action((...fnArgs) => {
      debug('running Cypress')
      require('./exec/run')
      .start(parseVariableOpts(fnArgs, args))
      .then(util.exit)
      .catch(util.logErrorExit1)
    })

    program
    .command('open')
    .usage('[options]')
    .description('Opens Cypress in the interactive GUI.')
    .option('-p, --port <port>', text('port'))
    .option('-e, --env <env>', text('env'))
    .option('-c, --config <config>', text('config'))
    .option('-d, --detached [bool]', text('detached'), coerceFalse)
    .option('-b, --browser <browser-path>', text('browserOpenMode'))
    .option('-P, --project <project-path>', text('project'))
    .option('--global', text('global'))
    .option('--dev', text('dev'), coerceFalse)
    .action((opts) => {
      debug('opening Cypress')
      require('./exec/open')
      .start(parseOpts(opts))
      .catch(util.logErrorExit1)
    })

    program
    .command('install')
    .usage('[options]')
    .description('Installs the Cypress executable matching this package\'s version')
    .option('-f, --force', text('forceInstall'))
    .action((opts) => {
      require('./tasks/install')
      .start(parseOpts(opts))
      .catch(util.logErrorExit1)
    })

    program
    .command('verify')
    .usage('[options]')
    .description('Verifies that Cypress is installed correctly and executable')
    .action((opts) => {
      const defaultOpts = { force: true, welcomeMessage: false }
      const parsedOpts = parseOpts(opts)
      const options = _.extend(parsedOpts, defaultOpts)

      require('./tasks/verify')
      .start(options)
      .catch(util.logErrorExit1)
    })

    program
    .command('cache')
    .usage('[command]')
    .description('Manages the Cypress binary cache')
    .option('list', text('cacheList'))
    .option('path', text('cachePath'))
    .option('clear', text('cacheClear'))
    .action(function (opts) {
      if (!_.isString(opts)) {
        this.outputHelp()
        util.exit(1)
      }

      if (opts.command || !_.includes(['list', 'path', 'clear'], opts)) {
        unknownOption.call(this, `cache ${opts}`, 'command')
      }

      cache[opts]()
    })

    debug('cli starts with arguments %j', args)
    util.printNodeOptions()

    // if there are no arguments
    if (args.length <= 2) {
      debug('printing help')
      program.help()
      // exits
    }

    const firstCommand = args[2]

    if (!_.includes(knownCommands, firstCommand)) {
      debug('unknown command %s', firstCommand)
      logger.error('Unknown command', `"${firstCommand}"`)
      program.outputHelp()

      return util.exit(1)
    }

    if (includesVersion(args)) {
      // commander 2.11.0 changes behavior
      // and now does not understand top level options
      // .option('-v, --version').command('version')
      // so we have to manually catch '-v, --version'
      return showVersions()
    }

    debug('program parsing arguments')

    return program.parse(args)
  },
}

if (!module.parent) {
  logger.error('This CLI module should be required from another Node module')
  logger.error('and not executed directly')
  process.exit(-1)
}