#
# Copyright 2014 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio 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, or (at your option)
# any later version.
#
# GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
""" Module to rename blocks """

import os
import re
from optparse import OptionGroup

from util_functions import append_re_line_sequence, ask_yes_no
from cmakefile_editor import CMakeFileEditor
from modtool_base import ModTool, ModToolException
from templates import Templates
from code_generator import get_template
import Cheetah.Template


class ModToolRename(ModTool):
    """ Add block to the out-of-tree module. """
    name = 'rename'
    aliases = ('insert',)

    def __init__(self):
        ModTool.__init__(self)
        self._add_cc_qa = False
        self._add_py_qa = False
        self._skip_cmakefiles = False
        self._license_file = None

    def setup_parser(self):
        parser = ModTool.setup_parser(self)
        ogroup = OptionGroup(parser, "Rename module options")
        ogroup.add_option("-o", "--old-name", type="string", default=None, help="Current name of the block to rename.")
        ogroup.add_option("-u", "--new-name", type="string", default=None, help="New name of the block.")
        parser.add_option_group(ogroup)
        return parser

    def setup(self, options, args):
        ModTool.setup(self, options, args)

        if ((self._skip_subdirs['lib'] and self._info['lang'] == 'cpp')
             or (self._skip_subdirs['python'] and self._info['lang'] == 'python')):
            raise ModToolException('Missing or skipping relevant subdir.')

        # first make sure the old block name is provided
        self._info['oldname'] = options.old_name
        if self._info['oldname'] is None:
            if len(args) >= 2:
                self._info['oldname'] = args[1]
            else:
                self._info['oldname'] = raw_input("Enter name of block/code to rename (without module name prefix): ")
        if not re.match('[a-zA-Z0-9_]+', self._info['oldname']):
            raise ModToolException('Invalid block name.')
        print "Block/code to rename identifier: " + self._info['oldname']
        self._info['fulloldname'] = self._info['modname'] + '_' + self._info['oldname']

        # now get the new block name
        self._info['newname'] = options.new_name
        if self._info['newname'] is None:
            if len(args) >= 2:
                self._info['newname'] = args[2]
            else:
                self._info['newname'] = raw_input("Enter name of block/code (without module name prefix): ")
        if not re.match('[a-zA-Z0-9_]+', self._info['newname']):
            raise ModToolException('Invalid block name.')
        print "Block/code identifier: " + self._info['newname']
        self._info['fullnewname'] = self._info['modname'] + '_' + self._info['newname']

    def run(self):
        """ Go, go, go. """
        module = self._info['modname']
        oldname = self._info['oldname']
        newname = self._info['newname']
        print "In module '%s' rename block '%s' to '%s'" % (module, oldname, newname)
        self._run_swig_rename(self._file['swig'], oldname, newname)
        self._run_grc_rename(self._info['modname'], oldname, newname)
        self._run_python_qa(self._info['modname'], oldname, newname)
        self._run_python(self._info['modname'], oldname, newname)
        self._run_lib(self._info['modname'], oldname, newname)
        self._run_include(self._info['modname'], oldname, newname)
        return

    def _run_swig_rename(self, swigfilename, old, new):
        """ Rename SWIG includes and block_magic """
        nsubs = self._run_file_replace(swigfilename, old, new)
        if nsubs < 1:
            print "Couldn't find '%s' in file '%s'." % (old, swigfilename)
        if nsubs == 2:
            print "Changing 'noblock' type file"
        if nsubs > 3:
            print "Hm, changed more then expected while editing %s." % swigfilename
        return False

    def _run_lib(self, module, old, new):
        ccfile = './lib/' + old + '_impl.cc'
        if not os.path.isfile(ccfile):  # in case it is a 'noblock'
            ccfile = './lib/' + old + '.cc'
        hfile = './lib/' + old + '_impl.h'
        self._run_file_replace(ccfile, old, new)
        self._run_file_replace(hfile, old, new)
        self._run_file_replace(hfile, old.upper(), new.upper())  # take care of include guards
        self._run_cmakelists('./lib/', old, new)
        self._run_file_rename('./lib/', old, new)
        self._run_cpp_qa(module, old, new)

    def _run_cpp_qa(self, module, old, new):
        path = './lib/'
        filename = 'qa_' + module + '.cc'
        nsubs = self._run_file_replace(path + filename, old, new)
        if nsubs > 0:
            print "C++ QA code detected, renaming..."
            filename = 'qa_' + old + '.cc'
            self._run_file_replace(path + filename, old, new)
            filename = 'qa_' + old + '.h'
            self._run_file_replace(path + filename, old, new)
            self._run_file_replace(path + filename, old.upper(), new.upper())
            self._run_file_rename(path, 'qa_' + old, 'qa_' + new)
        else:
            print "No C++ QA code detected, skipping..."

    def _run_include(self, module, old, new):
        path = './include/' + module + '/'
        filename = path + old + '.h'
        self._run_file_replace(filename, old, new)
        self._run_file_replace(filename, old.upper(), new.upper())  # take care of include guards
        self._run_cmakelists(path, old, new)
        self._run_file_rename(path, old, new)

    def _run_python(self, module, old, new):
        path = './python/'
        filename = '__init__.py'
        nsubs = self._run_file_replace(path + filename, old, new)
        if nsubs > 0:
            print "Python block detected, renaming..."
            filename = old + '.py'
            self._run_file_replace(path + filename, old, new)
            self._run_cmakelists(path, old, new)
            self._run_file_rename(path, old, new)
        else:
            print "Not a Python block, nothing to do here..."

    def _run_python_qa(self, module, old, new):
        new = 'qa_' + new
        old = 'qa_' + old
        filename = './python/' + old + '.py'
        self._run_file_replace(filename, old, new)
        self._run_cmakelists('./python/', old, new)
        self._run_file_rename('./python/', old, new)

    def _run_grc_rename(self, module, old, new):
        grcfile = './grc/' + module + '_' + old + '.xml'
        self._run_file_replace(grcfile, old, new)
        self._run_cmakelists('./grc/', old, new)
        self._run_file_rename('./grc/', old, new)

    def _run_cmakelists(self, path, first, second):
        filename = path + 'CMakeLists.txt'
        nsubs = self._run_file_replace(filename, first, second)
        if nsubs < 1:
            print "'%s' wasn't in '%s'." % (first, filename)

    def _run_file_rename(self, path, old, new):
        files = os.listdir(path)
        for file in files:
            if file.find(old) > -1 and file.find(old) < 3:
                nl = file.replace(old, new)
                src = path + file
                dst = path + nl
                print "Renaming file '%s' to '%s'." % (src, dst)
                os.rename(src, dst)

    def _run_file_replace(self, filename, old, new):
        if not os.path.isfile(filename):
            return False
        else:
            print "In '%s' renaming occurences of '%s' to '%s'" % (filename, old, new)

        cfile = open(filename).read()
        (cfile, nsubs) = re.subn(old, new, cfile)

        open(filename, 'w').write(cfile)
        self.scm.mark_file_updated(filename)
        return nsubs
