#!/usr/bin/env node
var yargs = require('yargs')
var qr = require('../lib')

function save (file, text, options) {
  qr.toFile(file, text, options, function (err, data) {
    if (err) {
      console.error('Error:', err.message)
      process.exit(1)
    }

    console.log('saved qrcode to: ' + file + '\n')
  })
}

function print (text, options) {
  options.type = 'terminal'
  qr.toString(text, options, function (err, text) {
    if (err) {
      console.error('Error:', err.message)
      process.exit(1)
    }

    console.log(text)
    console.log('\n')
  })
}

function parseOptions (args) {
  return {
    version: args.version,
    errorCorrectionLevel: args.error,
    type: args.type,
    maskPattern: args.mask,
    margin: args.qzone,
    width: args.width,
    scale: args.scale,
    color: {
      light: args.lightcolor,
      dark: args.darkcolor
    }
  }
}

function processInputs (text, opts) {
  if (!text.length) {
    yargs.showHelp()
    process.exit(1)
  }

  if (opts.output) {
    save(opts.output, text, parseOptions(opts))
  } else {
    print(text, parseOptions(opts))
  }
}

var argv = yargs
  .detectLocale(false)
  .usage('Usage: $0 [options] <input string>')
  .option('v', {
    alias: 'version',
    description: 'QR Code symbol version (1 - 40)',
    group: 'QR Code options:'
  })
  .option('e', {
    alias: 'error',
    description: 'Error correction level',
    choices: ['L', 'M', 'Q', 'H'],
    group: 'QR Code options:'
  })
  .option('m', {
    alias: 'mask',
    description: 'Mask pattern (0 - 7)',
    group: 'QR Code options:'
  })
  .option('t', {
    alias: 'type',
    description: 'Output type',
    choices: ['png', 'svg', 'utf8'],
    implies: 'output',
    group: 'Renderer options:'
  })
  .option('w', {
    alias: 'width',
    description: 'Image width (px)',
    conflicts: 'scale',
    group: 'Renderer options:'
  })
  .option('s', {
    alias: 'scale',
    description: 'Scale factor',
    conflicts: 'width',
    group: 'Renderer options:'
  })
  .option('q', {
    alias: 'qzone',
    description: 'Quiet zone size',
    group: 'Renderer options:'
  })
  .option('l', {
    alias: 'lightcolor',
    description: 'Light RGBA hex color',
    group: 'Renderer options:'
  })
  .option('d', {
    alias: 'darkcolor',
    description: 'Dark RGBA hex color',
    group: 'Renderer options:'
  })
  .option('o', {
    alias: 'output',
    description: 'Output file'
  })
  .help('h')
  .alias('h', 'help')
  .example('$0 "some text"', 'Draw in terminal window')
  .example('$0 -o out.png "some text"', 'Save as png image')
  .example('$0 -d F00 -o out.png "some text"', 'Use red as foreground color')
  .argv

if (process.stdin.isTTY) {
  processInputs(argv._.join(' '), argv)
} else {
  var text = ''
  process.stdin.setEncoding('utf8')
  process.stdin.on('readable', function () {
    var chunk = process.stdin.read()
    if (chunk !== null) {
      text += chunk
    }
  })

  process.stdin.on('end', function () {
    // this process can be run as a command outside of a tty so if there was no
    // data on stdin read from argv
    processInputs(text.length?text:argv._.join(' '), argv)
  })
}
