#! /usr/bin/env node

var fs = require('fs')
  , jsmin = require('jsmin').jsmin

var options = {
  output: true
, overwrite: false
, level: null
, comment: null
}

var args = Array.prototype.slice.call(process.argv, 2)
  , filename

out: while (args.length > 0) {
  var v = args.shift();
  switch (v) {
    case '-l':
    case '--level':
      options.level = parseInt(args.shift(), 10)
      break
    case '-c':
    case '--comment':
      options.comment = args.shift()
      break
    case '-o':
    case '--output':
      options.output = args.shift()
      break
    case '--overwrite':
      options.overwrite = true
      break
    default:
      filename = v
      break out
  }
}

if (filename) {
  fs.readFile(filename, 'utf8', function(err, text) {
    if (err) throw err
    output(jsmin(text, options.level, options.comment))
  })
}
else {
  var stdin = process.openStdin()
  stdin.setEncoding('utf8')
  var text = ''
  stdin.on('data', function(chunk) {
    text += chunk
  })
  stdin.on('end', function() {
    output(jsmin(text, options.level, options.comment))
  })
}

function output(text) {
  var out
  if (options.overwrite && filename) {
    options.output = filename
  }
  if (options.output === true) {
    out = process.stdout
  }
  else {
    out = fs.createWriteStream(options.output, { flags: 'w'
                                               , encoding: 'utf8'
                                               , mode: 0644
                                               })
  }
  out.write(text)
  if (options.output !== true) {
    out.end()
  }
}