const _ = require('lodash')
const commander = require('commander')
const { stripIndent } = require('common-tags')
const logSymbols = require('log-symbols')
const debug = require('debug')('cypress:cli:cli')
const util = require('./util')
const logger = require('./logger')
const errors = require('./errors')
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 spaceDelimitedArgsMsg = (flag, args) => {
  let msg = `
    ${logSymbols.warning} Warning: It looks like you're passing --${flag} a space-separated list of arguments:

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

    This will work, but it's not recommended.

    If you are trying to pass multiple arguments, separate them with commas instead:
      cypress run --${flag} arg1,arg2,arg3
  `

  if (flag === 'spec') {
    msg += `
    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"
    `
  }

  logger.log()
  logger.warn(stripIndent(msg))
  logger.log()
}

const parseVariableOpts = (fnArgs, args) => {
  const [opts, unknownArgs] = fnArgs

  if ((unknownArgs && unknownArgs.length) && (opts.spec || opts.tag)) {
    // this will capture space-delimited args after
    // flags that could have possible multiple args
    // but before the next option
    // --spec spec1 spec2 or --tag foo bar

    const multiArgFlags = _.compact([
      opts.spec ? 'spec' : opts.spec,
      opts.tag ? 'tag' : opts.tag,
    ])

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

      const maybeArgs = _.slice(args, argIndex, endIndex)
      const extraArgs = _.intersection(maybeArgs, unknownArgs)

      if (extraArgs.length) {
        opts[flag] = [opts[flag]].concat(extraArgs)
        spaceDelimitedArgsMsg(flag, opts[flag])
        opts[flag] = opts[flag].join(',')
      }
    })
  }

  debug('variable-length opts parsed %o', { args, opts })

  return util.parseOpts(opts)
}

const descriptions = {
  browserOpenMode: 'path to a custom browser to be added to the list of available browsers in Cypress',
  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.',
  cacheClear: 'delete all cached binaries',
  cacheList: 'list cached binary versions',
  cachePath: 'print the path to the binary cache',
  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',
  config: 'sets configuration values. separate multiple values with a comma. overrides any value in cypress.json.',
  configFile: 'path to JSON file where configuration values are set. defaults to "cypress.json". pass "false" to disable.',
  detached: 'runs Cypress application in detached mode',
  dev: 'runs cypress in development and bypasses binary check',
  env: 'sets environment variables. separate multiple values with a comma. overrides any value in cypress.json or cypress.env.json',
  exit: 'keep the browser open after tests finish',
  forceInstall: 'force install the Cypress binary',
  global: 'force Cypress into global mode as if its globally installed',
  group: 'a named group for recorded runs in the Cypress Dashboard',
  headed: 'displays the browser instead of running headlessly (defaults to true for Chrome-family browsers)',
  headless: 'hide the browser instead of running headed (defaults to true for Electron)',
  key: 'your secret Record Key. you can omit this if you set a CYPRESS_RECORD_KEY environment variable.',
  parallel: 'enables concurrent runs and automatic load balancing of specs across multiple machines or processes',
  port: 'runs Cypress on a specific port. overrides any value in cypress.json.',
  project: 'path to the project',
  record: 'records the run. sends test results, screenshots and videos to your Cypress Dashboard.',
  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"',
  spec: 'runs specific spec file(s). defaults to "all"',
  tag: 'named tag(s) for recorded runs in the Cypress Dashboard',
  version: 'prints Cypress version',
}

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

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
    }

    if (!util.isValidCypressEnvValue(process.env.CYPRESS_ENV)) {
      debug('invalid CYPRESS_ENV value', process.env.CYPRESS_ENV)

      return errors.exitWithError(errors.errors.invalidCypressEnv)(
        `CYPRESS_ENV=${process.env.CYPRESS_ENV}`
      )
    }

    const program = new commander.Command()

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

    program.usage('<command> [options]')

    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('-b, --browser <browser-name-or-path>', text('browserRunMode'))
    .option('--ci-build-id <id>', text('ciBuildId'))
    .option('-c, --config <config>', text('config'))
    .option('-C, --config-file <config-file>', text('configFile'))
    .option('-e, --env <env>', text('env'))
    .option('--group <name>', text('group'))
    .option('-k, --key <record-key>', text('key'))
    .option('--headed', text('headed'))
    .option('--headless', text('headless'))
    .option('--no-exit', text('exit'))
    .option('--parallel', text('parallel'))
    .option('-p, --port <port>', text('port'))
    .option('-P, --project <project-path>', text('project'))
    .option('--record [bool]', text('record'), coerceFalse)
    .option('-r, --reporter <reporter>', text('reporter'))
    .option('-o, --reporter-options <reporter-options>', text('reporterOptions'))
    .option('-s, --spec <spec>', text('spec'))
    .option('-t, --tag <tag>', text('tag'))
    .option('--dev', text('dev'), coerceFalse)
    .action((...fnArgs) => {
      debug('running Cypress with args %o', fnArgs)
      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('-b, --browser <browser-path>', text('browserOpenMode'))
    .option('-c, --config <config>', text('config'))
    .option('-C, --config-file <config-file>', text('configFile'))
    .option('-d, --detached [bool]', text('detached'), coerceFalse)
    .option('-e, --env <env>', text('env'))
    .option('--global', text('global'))
    .option('-p, --port <port>', text('port'))
    .option('-P, --project <project-path>', text('project'))
    .option('--dev', text('dev'), coerceFalse)
    .action((opts) => {
      debug('opening Cypress')
      require('./exec/open')
      .start(util.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(util.parseOpts(opts))
      .catch(util.logErrorExit1)
    })

    program
    .command('verify')
    .usage('[options]')
    .description(
      'Verifies that Cypress is installed correctly and executable'
    )
    .option('--dev', text('dev'), coerceFalse)
    .action((opts) => {
      const defaultOpts = { force: true, welcomeMessage: false }
      const parsedOpts = util.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)
}