# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import base64
import codecs
import json
import os
import string
import subprocess
import sys


BASE_DIR = os.path.dirname(os.path.abspath(__file__))


def Run(*args):
  p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  out, err = p.communicate()
  if p.returncode != 0:
    raise SystemExit(out)


def FindNode(node, component):
  for child in node['children']:
    if child['name'] == component:
      return child
  return None


def InsertIntoTree(tree, source_name, size):
  components = source_name[3:].split('\\')
  node = tree
  for index, component in enumerate(components):
    data = FindNode(node, component)
    if not data:
      data = { 'name': source_name, 'name': component }
      if index == len(components) - 1:
        data['size'] = size
      else:
        data['children'] = []
      node['children'].append(data)
    node = data


def FlattenTree(tree):
  result = [['Path', 'Parent', 'Size', 'Value']]
  def Flatten(node, parent):
    name = node['name']
    if parent and parent != '/':
      name = parent + '/' + name
    if 'children' in node:
      result.append([name, parent, -1, -1])
      for c in node['children']:
        Flatten(c, name)
    else:
      result.append([name, parent, node['size'], node['size']])
  Flatten(tree, '')
  return result


def GetAsset(filename):
  with open(os.path.join(BASE_DIR, filename), 'rb') as f:
    return f.read()


def AppendAsScriptBlock(f, value, var=None):
  f.write('<script type="text/javascript">\n')
  if var:
    f.write('var ' + var + ' = ')
  f.write(value)
  if var:
    f.write(';\n')
  f.write('</script>\n')


def main():
  jsons = []
  if len(sys.argv) > 1:
    dlls = sys.argv[1:]
  else:
    out_dir = os.path.join(BASE_DIR, '..', '..', '..', 'out', 'Release')
    dlls = [os.path.normpath(os.path.join(out_dir, dll))
            for dll in ('chrome.dll', 'chrome_child.dll')]
  for dll_path in dlls:
    if os.path.exists(dll_path):
      print 'Tallying %s...' % dll_path
      json_path = dll_path + '.json'
      Run(os.path.join(BASE_DIR, '..', '..', '..', 'third_party', 'syzygy',
                       'binaries', 'exe', 'experimental', 'code_tally.exe'),
          '--input-image=' + dll_path,
          '--input-pdb=' + dll_path + '.pdb',
          '--output-file=' + json_path)
      jsons.append(json_path)
  if not jsons:
    print 'Couldn\'t find dlls.'
    print 'Pass fully qualified dll name(s) if you want to use something other '
    print 'than out\\Release\\chrome.dll and chrome_child.dll.'
    return 1

  # Munge the code_tally json format into an easier-to-view format.
  for json_name in jsons:
    with open(json_name, 'r') as jsonf:
      all_data = json.load(jsonf)
    html_path = os.path.splitext(json_name)[0] + '.html'
    print 'Generating %s... (standlone)' % html_path
    by_source = {}
    symbols_index = {}
    symbols = []
    for obj_name, obj_data in all_data['objects'].iteritems():
      for symbol, symbol_data in obj_data.iteritems():
        size = int(symbol_data['size'])
        # Sometimes there's symbols with no source file, we just ignore those.
        if 'contribs' in symbol_data:
          i = 0
          while i < len(symbol_data['contribs']):
            src_index = symbol_data['contribs'][i]
            i += 1
            per_line = symbol_data['contribs'][i]
            i += 1
            source = all_data['sources'][int(src_index)]
            if source not in by_source:
              by_source[source] = {'lines': {}, 'total_size': 0}
            size = 0
            # per_line is [line, size, line, size, line, size, ...]
            for j in range(0, len(per_line), 2):
              line_number = per_line[j]
              size += per_line[j + 1]
              # Save some time/space in JS by using an array here. 0 == size,
              # 1 == symbol list.
              by_source[source]['lines'].setdefault(line_number, [0, []])
              by_source[source]['lines'][line_number][0] += per_line[j + 1]
              if symbol in symbols_index:
                symindex = symbols_index[symbol]
              else:
                symbols.append(symbol)
                symbols_index[symbol] = symindex = len(symbols) - 1
              by_source[source]['lines'][line_number][1].append(
                  symindex)
            by_source[source]['total_size'] += size
    binary_name = all_data['executable']['name']
    data = {}
    data['name'] = '/'
    data['children'] = []
    file_contents = {}
    line_data = {}
    for source, file_data in by_source.iteritems():
      InsertIntoTree(data, source, file_data['total_size'])

      store_as = source[3:].replace('\\', '/')
      try:
        with codecs.open(source, 'rb', encoding='latin1') as f:
          file_contents[store_as] = f.read()
      except IOError:
        file_contents[store_as] = '// Unable to load source.'

      line_data[store_as] = file_data['lines']
      # code_tally attempts to assign fractional bytes when code is shared
      # across multiple symbols. Round off here for display after summing above.
      for per_line in line_data[store_as].values():
        per_line[0] = round(per_line[0])

    flattened = FlattenTree(data)
    maxval = 0
    for i in flattened[1:]:
      maxval = max(i[2], maxval)
    flattened_str = json.dumps(flattened)

    to_write = GetAsset('template.html')
    # Save all data and what would normally be external resources into the
    # one html so that it's a standalone report.
    with open(html_path, 'w') as f:
      f.write(to_write)
      # These aren't subbed in as a silly workaround for 32-bit python.
      # The end result is only ~100M, but while substituting these into a
      # template, it otherwise raises a MemoryError, I guess due to
      # fragmentation. So instead, we just append them as variables to the file
      # and then refer to the variables in the main script.
      filedata_str = json.dumps(file_contents).replace(
          '</script>', '</scr"+"ipt>')
      AppendAsScriptBlock(f, filedata_str, var='g_file_contents')
      AppendAsScriptBlock(f, json.dumps(line_data), var='g_line_data')
      AppendAsScriptBlock(f, json.dumps(symbols), var='g_symbol_list')
      favicon_str = json.dumps(base64.b64encode(GetAsset('favicon.png')))
      AppendAsScriptBlock(f, favicon_str, var='g_favicon')
      AppendAsScriptBlock(f, flattened_str, var='g_raw_data')
      AppendAsScriptBlock(f, str(maxval), var='g_maxval')
      dllname_str = binary_name + ' ' + all_data['executable']['version']
      AppendAsScriptBlock(f, json.dumps(dllname_str), var='g_dllname')
      AppendAsScriptBlock(f, GetAsset('codemirror.js'))
      AppendAsScriptBlock(f, GetAsset('clike.js'))
      AppendAsScriptBlock(f, GetAsset('main.js'))
      f.write('</html>')

  return 0


if __name__ == '__main__':
  sys.exit(main())