# -*- coding: utf-8 -*-
# This file is part of lyx2lyx
# -*- coding: utf-8 -*-
# Copyright (C) 2011 The LyX team
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

""" Convert files to the file format generated by lyx 2.1"""

import re, string
import unicodedata
import sys, os

# Uncomment only what you need to import, please.

from parser_tools import find_token, find_end_of_inset, get_value

#from parser_tools import find_token, find_end_of, find_tokens, \
  #find_token_exact, find_end_of_inset, find_end_of_layout, \
  #find_token_backwards, is_in_inset, get_value, get_quoted_value, \
  #del_token, check_token, get_option_value

from lyx2lyx_tools import add_to_preamble, put_cmd_in_ert

#from lyx2lyx_tools import add_to_preamble, insert_to_preamble, \
#  put_cmd_in_ert, lyx2latex, latex_length, revert_flex_inset, \
#  revert_font_attrs, hex2ratio, str2bool

####################################################################
# Private helper functions

#def remove_option(lines, m, option):
    #''' removes option from line m. returns whether we did anything '''
    #l = lines[m].find(option)
    #if l == -1:
        #return False
    #val = lines[m][l:].split('"')[1]
    #lines[m] = lines[m][:l - 1] + lines[m][l+len(option + '="' + val + '"'):]
    #return True


###############################################################################
###
### Conversion and reversion routines
###
###############################################################################

def revert_visible_space(document):
    "Revert InsetSpace visible into its ERT counterpart"
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset space \\textvisiblespace{}", i)
      if i == -1:
        return
      end = find_end_of_inset(document.body, i)
      subst = put_cmd_in_ert("\\textvisiblespace{}")
      document.body[i:end + 1] = subst


def convert_undertilde(document):
    " Load undertilde automatically "
    i = find_token(document.header, "\\use_mathdots" , 0)
    if i != -1:
      document.header.insert(i + 1, "\\use_undertilde 1")


def revert_undertilde(document):
    " Load undertilde if used in the document "
    undertilde = find_token(document.header, "\\use_undertilde" , 0)
    if undertilde == -1:
      document.warning("No \\use_undertilde line. Assuming auto.")
    else:
      val = get_value(document.header, "\\use_undertilde", undertilde)
      del document.header[undertilde]
      try:
        usetilde = int(val)
      except:
        document.warning("Invalid \\use_undertilde value: " + val + ". Assuming auto.")
        # probably usedots has not been changed, but be safe.
        usetilde = 1

      if usetilde == 0:
        # do not load case
        return
      if usetilde == 2:
        # force load case
        add_to_preamble(document, ["\\usepackage{undertilde}"])
        return
    
    # so we are in the auto case. we want to load undertilde if \utilde is used.
    i = 0
    while True:
      i = find_token(document.body, '\\begin_inset Formula', i)
      if i == -1:
        return
      j = find_end_of_inset(document.body, i)
      if j == -1:
        document.warning("Malformed LyX document: Can't find end of Formula inset at line " + str(i))
        i += 1
        continue
      code = "\n".join(document.body[i:j])
      if code.find("\\utilde") != -1:
        add_to_preamble(document, ["\\@ifundefined{utilde}{\\usepackage{undertilde}}"])
        return
      i = j


def revert_negative_space(document):
    "Revert InsetSpace negmedspace and negthickspace into its TeX-code counterpart"
    i = 0
    j = 0
    reverted = False
    while True:
      i = find_token(document.body, "\\begin_inset space \\negmedspace{}", i)
      if i == -1:
        j = find_token(document.body, "\\begin_inset space \\negthickspace{}", j)
        if j == -1:
          # load amsmath in the preamble if not already loaded if we are at the end of checking
          if reverted == True:
            i = find_token(document.header, "\\use_amsmath 2", 0)
            if i == -1:
              add_to_preamble(document, ["\\@ifundefined{negthickspace}{\\usepackage{amsmath}}"])
          return
      if i == -1:
        return
      end = find_end_of_inset(document.body, i)
      subst = put_cmd_in_ert("\\negmedspace{}")
      document.body[i:end + 1] = subst
      j = find_token(document.body, "\\begin_inset space \\negthickspace{}", j)
      if j == -1:
        return
      end = find_end_of_inset(document.body, j)
      subst = put_cmd_in_ert("\\negthickspace{}")
      document.body[j:end + 1] = subst
      reverted = True


def revert_math_spaces(document):
    "Revert formulas with protected custom space and protected hfills to TeX-code"
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset Formula", i)
      if i == -1:
        return
      j = document.body[i].find("\\hspace*")
      if j != -1:
        end = find_end_of_inset(document.body, i)
        subst = put_cmd_in_ert(document.body[i][21:])
        document.body[i:end + 1] = subst
      i = i + 1


##
# Conversion hub
#

supported_versions = ["2.1.0","2.1"]
convert = [[414, []],
           [415, [convert_undertilde]],
           [416, []]
          ]

revert =  [[415, [revert_negative_space,revert_math_spaces]],
           [414, [revert_undertilde]],
           [413, [revert_visible_space]]
          ]


if __name__ == "__main__":
    pass