#!/usr/bin/python2.7
# Compresses the Blockscad files into a single javascript file.
#
'''
    Copyright (C) 2014-2015  H3XL, Inc

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
'''

import errno, httplib, json, os, re, subprocess, sys, threading, urllib

# Define the parameters for the POST request and encode them in
# a URL-safe format.


HEADER = ('// Do not edit this file; automatically generated by blockscad_build.py.\n'
          '"use strict";');

class Gen_compressed(threading.Thread):
  """Generate a JavaScript file that contains all of Blockly's core and all
  required parts of Closure, compiled together.
  Uses the Closure Compiler's online API.
  Runs in a separate thread.
  """
  def __init__(self, search_paths):
    threading.Thread.__init__(self)
    self.search_paths = search_paths

  def run(self):
    self.gen_blockscad()
    self.gen_viewer()

  def gen_blockscad(self):
    target_filename = 'blockscad_compressed.js'
    # Define the parameters for the POST request.
    params = [
        ('compilation_level', 'SIMPLE_OPTIMIZATIONS'),
        ('output_format', 'json'),
        ('language', 'ECMASCRIPT5'),
        ('output_info', 'compiled_code'),
        ('output_info', 'warnings'),
        ('output_info', 'errors'),
        ('output_info', 'statistics'),
      ]

    # Read in all the source files.
    filenames = ['bsPage.js','storage.js','utils.js','blockscad.js',  
                 'text.js','lightgl.js','toolbox.js','deflate.js', 'stl.js']
    for filename in filenames:
      f = open(filename)
      print filename
      params.append(('js_code', ''.join(f.readlines())))
      f.close()

    self.do_compile(params, target_filename, filenames, '')

  def gen_viewer(self):
    target_filename = 'viewer_compressed.js'
    # Define the parameters for the POST request.
    params = [
        ('compilation_level', 'SIMPLE_OPTIMIZATIONS'),
        ('output_format', 'json'),
        ('language', 'ECMASCRIPT5'),
        ('output_info', 'compiled_code'),
        ('output_info', 'warnings'),
        ('output_info', 'errors'),
        ('output_info', 'statistics'),
      ]

    # Read in all the source files.
    filenames = ['viewer.js', 'csg.js', 'formats.js']
    for filename in filenames:
      f = open(filename)
      print filename
      params.append(('js_code', ''.join(f.readlines())))
      f.close()

    self.do_compile(params, target_filename, filenames, '')

  def do_compile(self, params, target_filename, filenames, remove):
    # Send the request to Google.
    headers = {'Content-type': 'application/x-www-form-urlencoded'}
    conn = httplib.HTTPConnection('closure-compiler.appspot.com')
    conn.request('POST', '/compile', urllib.urlencode(params), headers)
    response = conn.getresponse()
    json_str = response.read()
    conn.close()

    # Parse the JSON response.
    json_data = json.loads(json_str)

    def file_lookup(name):
      if not name.startswith('Input_'):
        return '???'
      n = int(name[6:])
      return filenames[n]

    if json_data.has_key('serverErrors'):
      errors = json_data['serverErrors']
      for error in errors:
        print('SERVER ERROR: %s' % target_filename)
        print(error['error'])
    elif json_data.has_key('errors'):
      errors = json_data['errors']
      for error in errors:
        print('FATAL ERROR')
        print(error['error'])
        if error['file']:
          print('%s at line %d:' % (
              file_lookup(error['file']), error['lineno']))
          print(error['line'])
          print((' ' * error['charno']) + '^')
        sys.exit(1)
    else:
      if json_data.has_key('warnings'):
        warnings = json_data['warnings']
        for warning in warnings:
          print('WARNING')
          print(warning['warning'])
          if warning['file']:
            print('%s at line %d:' % (
                file_lookup(warning['file']), warning['lineno']))
            print(warning['line'])
            print((' ' * warning['charno']) + '^')
        print()

      if not json_data.has_key('compiledCode'):
        print('FATAL ERROR: Compiler did not return compiledCode.')
        sys.exit(1)

      code = HEADER + '\n' + json_data['compiledCode']
      # code = code.replace(remove, '')

      stats = json_data['statistics']
      original_b = stats['originalSize']
      compressed_b = stats['compressedSize']
      if original_b > 0 and compressed_b > 0:
        f = open(target_filename, 'w')
        f.write(code)
        f.close()

        original_kb = int(original_b / 1024 + 0.5)
        compressed_kb = int(compressed_b / 1024 + 0.5)
        ratio = int(float(compressed_b) / float(original_b) * 100 + 0.5)
        print('SUCCESS: ' + target_filename)
        print('Size changed from %d KB to %d KB (%d%%).' % (
            original_kb, compressed_kb, ratio))
      else:
        print('UNKNOWN ERROR')

def file_lookup(name):
  if not name.startswith('Input_'):
    return '???'
  n = int(name[6:])
  return filenames[n]
if __name__ == '__main__':
  Gen_compressed('').start()