#!/usr/bin/env node

var path = require('path')
var fs = require('fs')
var resolve = require('resolve')
var info = require('../lib/log')

var NODE_PATH = process.env.NODE_PATH

var requireCliAndRun = function (karmaPath) {
  if (process.argv.indexOf('--which') !== -1) {
    info.log(karmaPath)
  } else {
    require(path.join(karmaPath, 'lib', 'cli')).run()
  }
}

resolve('karma', {basedir: process.cwd()}, function (err, pathToKarma) {
  // There is a local version, let's use it.
  if (!err) {
    return requireCliAndRun(pathToKarma.replace(/(\/|\\)lib(\/|\\)index\.js/, ''))
  }

  // We can't load a global one, since NODE_PATH is not defined.
  if (!NODE_PATH) {
    // Let's try a siblink to karma-cli, that is a global module with NVM.
    var siblinkKarma = path.normalize(path.join(__dirname, '..', '..', 'karma'))
    if (fs.existsSync(siblinkKarma)) {
      return requireCliAndRun(siblinkKarma)
    }

    info.fatal('Cannot find local Karma!\n' +
      '  Please install Karma by `npm install karma --save-dev`.\n' +
      '  If you wanna use a global instance, please set NODE_PATH env variable.\n', 1)
    return
  }

  // Let's try global paths.
  var globalPaths = NODE_PATH.split(path.delimiter)
  var globalKarma

  while (globalPaths.length) {
    globalKarma = path.normalize(path.join(globalPaths.shift(), 'karma'))
    if (fs.existsSync(globalKarma)) {
      return requireCliAndRun(globalKarma)
    }
  }

  info.fatal('Cannot find local Karma!\n' +
    '  Please install karma by `npm install karma --save-dev`.\n', 1)
})