#!/usr/bin/env python3

from optparse import OptionParser
import glob
import io
import os
import re
import sys

def read_file(name, normalize=True):
  """ Read a file. """
  try:
    with open(name, 'r', encoding='utf-8') as f:
      # read the data
      data = f.read()
      if normalize:
        # normalize line endings
        data = data.replace("\r\n", "\n")
      return data
  except IOError as e:
    (errno, strerror) = e.args
    sys.stderr.write('Failed to read file ' + name + ': ' + strerror)
    raise

def write_file(name, data):
  """ Write a file. """
  try:
    with open(name, 'w', encoding='utf-8') as f:
      # write the data
      if sys.version_info.major == 2:
        f.write(data.decode('utf-8'))
      else:
        f.write(data)
  except IOError as e:
    (errno, strerror) = e.args
    sys.stderr.write('Failed to write file ' + name + ': ' + strerror)
    raise

def auto_check_header(file):
  groups_to_check = []

  data = read_file(file)
  if not 'addon_auto_check' in data:
    return ''

  for line in io.StringIO(data):
    line = re.search(r"^.*\/\/\/.*@copydetails *(.*)(_header|_source)_addon_auto_check.*", line, flags=re.UNICODE)
    if line and line.group(1):
      group = line.group(1)
      if group in groups_to_check:
        continue

      print(' - Found use with %s' % group)
      groups_to_check.append(line.group(1))

  return groups_to_check

def parse_header(file, group, new_path=''):
  header_sources = ''
  header_addon = ''
  source_addon = ''

  data = read_file(file)
  group_found = False
  group_start = False
  virtual_function_start = False
  for line in io.StringIO(data):
    if not group_found and 'defgroup ' + group in line:
      group_found = True
      continue
    elif group_found and not group_start and '///@{' in line:
      group_start = True
      continue
    elif group_start and '///@}' in line:
      break
    elif re.match(r'^.*//.*', line) or re.match(r'^.*//.*', line) or line == '\n' or not group_start:
      continue

    if re.match(r'^.*virtual.*', line):
      virtual_function_start = True

    if virtual_function_start:
      header_sources += re.sub(r"^\s+", "", line, flags=re.UNICODE)

    if virtual_function_start and re.match(r'^.*}.*', line):
      virtual_function_start = False

  if not group_found:
    return ""

  header_sources = header_sources.replace("\n", "")
  header_sources = " ".join(re.split("\s+", header_sources, flags=re.UNICODE))
  header_sources = header_sources.replace("}", "}\n")
  header_sources = header_sources.replace("= 0;", "= 0;\n")
  header_sources = header_sources.replace(",", ", ")

  # Generate class header part of list
  header_addon += '/// @defgroup ' + group + '_header_addon_auto_check Group header include\n'
  header_addon += '/// @ingroup ' + group + '\n'
  header_addon += '///@{\n'
  header_addon += '/// *Header parts:*\n'
  header_addon += '/// ~~~~~~~~~~~~~{.cpp}\n'
  header_addon += '///\n'
  for line in io.StringIO(header_sources):
    line = re.search(r"^.*virtual.([A-Za-z1-9].*\(.*\))", line, flags=re.UNICODE)
    if line:
      header_addon += '/// ' + re.sub(' +', ' ', line.group(1)) + ' override;\n'
  header_addon += '///\n'
  header_addon += '/// ~~~~~~~~~~~~~\n'
  header_addon += '///@}\n\n'

  # Generate class source part of list
  source_addon += '/// @defgroup ' + group + '_source_addon_auto_check Group source include\n'
  source_addon += '/// @ingroup ' + group + '\n'
  source_addon += '///@{\n'
  source_addon += '/// *Source parts:*\n'
  source_addon += '/// ~~~~~~~~~~~~~{.cpp}\n'
  source_addon += '///\n'
  for line in io.StringIO(header_sources):
    line = line.replace("{", "\n{\n  ")
    line = line.replace("}", "\n}")
    for line in io.StringIO(line + '\n'):
      func = re.search(r"^.*(virtual *) *(.*) ([a-z|A-Z|0-9].*)(\(.*\))", line, flags=re.UNICODE)
      if func:
        source_addon += '/// ' + re.sub(' +', ' ', func.group(2) + ' CMyInstance::' + func.group(3) + func.group(4) + '\n')
      else:
        source_addon += '/// ' + line
      if '= 0' in line:
        source_addon += '/// {\n'
        source_addon += '///   // Required in interface to have!\n'
        source_addon += '///   // ...\n'
        source_addon += '/// }\n'

  source_addon += '/// ~~~~~~~~~~~~~\n'
  source_addon += '///@}\n\n'

  return header_addon + source_addon

def print_error(msg):
  print('Error: %s\nSee --help for usage.' % msg)

# cannot be loaded as a module
if __name__ != "__main__":
  sys.stderr.write('This file cannot be loaded as a module!')
  sys.exit()

# parse command-line options
disc = """
This utility generate group list about addon header sources to add inside doxygen.
"""

parser = OptionParser(description=disc)
parser.add_option(
    '--header-file',
    dest='headerfile',
    metavar='DIR',
    help='the to checked header [required]')
parser.add_option(
    '--doxygen-group',
    dest='doxygengroup',
    help='the to checked doxygen group inside header [required]')
(options, args) = parser.parse_args()

docs = ''
groups_to_check = []

# Check about use of helper docs
if options.doxygengroup is None:
  print('Scaning about used places...')
  headers = glob.glob("../include/kodi/**/*.h", recursive=True)
  for header in headers:
    group = auto_check_header(header)
    if group:
      groups_to_check += group
else:
  groups_to_check.append(options.doxygengroup)

# Generate the helper docs
if options.headerfile is None:
  headers = glob.glob("../include/kodi/**/*.h", recursive=True)
  print('Parsing about docs:')
  for header in headers:
    print(' - %s' % header)
    for group in groups_to_check:
      docs += parse_header(header, group)
else:
  for group in groups_to_check:
    docs += parse_header(options.headerfile, group)

write_file("../include/groups.dox", docs)