#
# Copyright 2010,2011 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.
#
"""
Creates the swig_doc.i SWIG interface file.
Execute using: python swig_doc.py xml_path outputfilename

The file instructs SWIG to transfer the doxygen comments into the
python docstrings.

"""

import sys, time

try:
    from doxyxml import DoxyIndex, DoxyClass, DoxyFriend, DoxyFunction, DoxyFile, base
except ImportError:
    from gnuradio.doxyxml import DoxyIndex, DoxyClass, DoxyFriend, DoxyFunction, DoxyFile, base


def py_name(name):
    bits = name.split('_')
    return '_'.join(bits[1:])

def make_name(name):
    bits = name.split('_')
    return bits[0] + '_make_' + '_'.join(bits[1:])


class Block(object):
    """
    Checks if doxyxml produced objects correspond to a gnuradio block.
    """

    @classmethod
    def includes(cls, item):
        if not isinstance(item, DoxyClass):
            return False
        # Check for a parsing error.
        if item.error():
            return False
        return item.has_member(make_name(item.name()), DoxyFriend)


def utoascii(text):
    """
    Convert unicode text into ascii and escape quotes.
    """
    if text is None:
        return ''
    out = text.encode('ascii', 'replace')
    out = out.replace('"', '\\"')
    return out


def combine_descriptions(obj):
    """
    Combines the brief and detailed descriptions of an object together.
    """
    description = []
    bd = obj.brief_description.strip()
    dd = obj.detailed_description.strip()
    if bd:
        description.append(bd)
    if dd:
        description.append(dd)
    return utoascii('\n\n'.join(description)).strip()


entry_templ = '%feature("docstring") {name} "{docstring}"'
def make_entry(obj, name=None, templ="{description}", description=None):
    """
    Create a docstring entry for a swig interface file.

    obj - a doxyxml object from which documentation will be extracted.
    name - the name of the C object (defaults to obj.name())
    templ - an optional template for the docstring containing only one
            variable named 'description'.
    description - if this optional variable is set then it's value is
            used as the description instead of extracting it from obj.
    """
    if name is None:
        name=obj.name()
    if "operator " in name:
        return ''
    if description is None:
        description = combine_descriptions(obj)
    docstring = templ.format(description=description)
    if not docstring:
        return ''
    return entry_templ.format(
        name=name,
        docstring=docstring,
        )


def make_func_entry(func, name=None, description=None, params=None):
    """
    Create a function docstring entry for a swig interface file.

    func - a doxyxml object from which documentation will be extracted.
    name - the name of the C object (defaults to func.name())
    description - if this optional variable is set then it's value is
            used as the description instead of extracting it from func.
    params - a parameter list that overrides using func.params.
    """
    if params is None:
        params = func.params
    params = [prm.declname for prm in params]
    if params:
        sig = "Params: (%s)" % ", ".join(params)
    else:
        sig = "Params: (NONE)"
    templ = "{description}\n\n" + sig
    return make_entry(func, name=name, templ=utoascii(templ),
                      description=description)


def make_class_entry(klass, description=None):
    """
    Create a class docstring for a swig interface file.
    """
    output = []
    output.append(make_entry(klass, description=description))
    for func in klass.in_category(DoxyFunction):
        name = klass.name() + '::' + func.name()
        output.append(make_func_entry(func, name=name))
    return "\n\n".join(output)


def make_block_entry(di, block):
    """
    Create class and function docstrings of a gnuradio block for a
    swig interface file.
    """
    descriptions = []
    # Get the documentation associated with the class.
    class_desc = combine_descriptions(block)
    if class_desc:
        descriptions.append(class_desc)
    # Get the documentation associated with the make function
    make_func = di.get_member(make_name(block.name()), DoxyFunction)
    make_func_desc = combine_descriptions(make_func)
    if make_func_desc:
        descriptions.append(make_func_desc)
    # Get the documentation associated with the file
    try:
        block_file = di.get_member(block.name() + ".h", DoxyFile)
        file_desc = combine_descriptions(block_file)
        if file_desc:
            descriptions.append(file_desc)
    except base.Base.NoSuchMember:
        # Don't worry if we can't find a matching file.
        pass
    # And join them all together to make a super duper description.
    super_description = "\n\n".join(descriptions)
    # Associate the combined description with the class and
    # the make function.
    output = []
    output.append(make_class_entry(block, description=super_description))
    creator = block.get_member(block.name(), DoxyFunction)
    output.append(make_func_entry(make_func, description=super_description,
                                  params=creator.params))
    return "\n\n".join(output)


def make_swig_interface_file(di, swigdocfilename, custom_output=None):

    output = ["""
/*
 * This file was automatically generated using swig_doc.py.
 *
 * Any changes to it will be lost next time it is regenerated.
 */
"""]

    if custom_output is not None:
        output.append(custom_output)

    # Create docstrings for the blocks.
    tries = 0
    while(1):
        try:
            blocks = di.in_category(Block)
        except:
            if(tries < 3):
                # May not be built just yet; sleep and try again
                sys.stderr.write("XML parsing problem with file {0}, retrying.\n".format(
                        swigdocfilename))
                time.sleep(1)
                tries += 1
            else:
                # if we've given it three tries, give up and raise an error
                sys.stderr.write("XML parsing error with file {0}. giving up.\n".format(
                        swigdocfilename))
                raise
        else:
            break

    make_funcs = set([])
    for block in blocks:
        tries = 0
        while(1):
            try:
                make_func = di.get_member(make_name(block.name()), DoxyFunction)
                make_funcs.add(make_func.name())
                output.append(make_block_entry(di, block))
            except block.ParsingError:
                sys.stderr.write('Parsing error for block {0}'.format(block.name()))
            except:
                if(tries < 3):
                    # May not be built just yet; sleep and try again
                    sys.stderr.write("XML parsing problem with file {0}, retrying.\n".format(
                            swigdocfilename))
                    time.sleep(1)
                    tries += 1
                else:
                    # if we've given it three tries, give up and raise an error
                    sys.stderr.write("XML parsing error with file {0}. giving up.\n".format(
                            swigdocfilename))
                    raise
            else:
                break

    # Create docstrings for functions
    # Don't include the make functions since they have already been dealt with.
    funcs = [f for f in di.in_category(DoxyFunction) if f.name() not in make_funcs]
    for f in funcs:
        try:
            output.append(make_func_entry(f))
        except f.ParsingError:
            sys.stderr.write('Parsing error for function {0}'.format(f.name()))

    # Create docstrings for classes
    block_names = [block.name() for block in blocks]
    klasses = [k for k in di.in_category(DoxyClass) if k.name() not in block_names]
    for k in klasses:
        try:
            output.append(make_class_entry(k))
        except k.ParsingError:
            sys.stderr.write('Parsing error for class {0}'.format(k.name()))

    # Docstrings are not created for anything that is not a function or a class.
    # If this excludes anything important please add it here.

    output = "\n\n".join(output)

    swig_doc = file(swigdocfilename, 'w')
    swig_doc.write(output)
    swig_doc.close()

if __name__ == "__main__":
    # Parse command line options and set up doxyxml.
    err_msg = "Execute using: python swig_doc.py xml_path outputfilename"
    if len(sys.argv) != 3:
        raise StandardError(err_msg)
    xml_path = sys.argv[1]
    swigdocfilename = sys.argv[2]
    di = DoxyIndex(xml_path)

    # gnuradio.gr.msq_queue.insert_tail and delete_head create errors unless docstrings are defined!
    # This is presumably a bug in SWIG.
    #msg_q = di.get_member(u'gr_msg_queue', DoxyClass)
    #insert_tail = msg_q.get_member(u'insert_tail', DoxyFunction)
    #delete_head = msg_q.get_member(u'delete_head', DoxyFunction)
    output = []
    #output.append(make_func_entry(insert_tail, name='gr_py_msg_queue__insert_tail'))
    #output.append(make_func_entry(delete_head, name='gr_py_msg_queue__delete_head'))
    custom_output = "\n\n".join(output)

    # Generate the docstrings interface file.
    # If parsing error on NoSuchMember, try again by rereading everything.
    # Give up after 3 tries.
    tries = 0
    while(1):
        try:
            make_swig_interface_file(di, swigdocfilename, custom_output=custom_output)
        except:
            if(tries < 3):
                # May not be built just yet; sleep and try again
                sys.stderr.write("XML parsing problem with file {0}, retrying.\n".format(
                        swigdocfilename))
                time.sleep(1)
                tries += 1
            else:
                # if we've given it three tries, give up and raise an error
                sys.stderr.write("XML parsing error with file {0}. giving up.\n".format(
                        swigdocfilename))
                raise
        else:
            break