#
# Copyright 2010-2012 Free Software Foundation, Inc.
#
# This file was generated by gr_modtool, a tool from the GNU Radio framework
# This file is a part of gnuradio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
"""
Updates the *pydoc_h files for a module
Execute using: python update_pydoc.py xml_path outputfilename

The file instructs Pybind11 to transfer the doxygen comments into the
python docstrings.

"""
from __future__ import unicode_literals

import os, sys, time, glob, re, json
from argparse import ArgumentParser

from doxyxml import DoxyIndex, DoxyClass, DoxyFriend, DoxyFunction, DoxyFile
from doxyxml import DoxyOther, 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
        friendname = make_name(item.name())
        is_a_block = item.has_member(friendname, DoxyFriend)
        # But now sometimes the make function isn't a friend so check again.
        if not is_a_block:
            is_a_block = di.has_member(friendname, DoxyFunction)
        return is_a_block

class Block2(object):
    """
    Checks if doxyxml produced objects correspond to a new style
    gnuradio block.
    """

    @classmethod
    def includes(cls, item):
        if not isinstance(item, DoxyClass):
            return False
        # Check for a parsing error.
        if item.error():
            return False
        is_a_block2 = item.has_member('make', DoxyFunction) and item.has_member('sptr', DoxyOther)
        return is_a_block2


def utoascii(text):
    """
    Convert unicode text into ascii and escape quotes and backslashes.
    """
    if text is None:
        return ''
    out = text.encode('ascii', 'replace')
    # swig will require us to replace blackslash with 4 backslashes
    # TODO: evaluate what this should be for pybind11
    out = out.replace(b'\\', b'\\\\\\\\')
    out = out.replace(b'"', b'\\"').decode('ascii')
    return str(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()

def format_params(parameteritems):
    output = ['Args:']
    template = '    {0} : {1}'
    for pi in parameteritems:
        output.append(template.format(pi.name, pi.description))
    return '\n'.join(output)

entry_templ = '%feature("docstring") {name} "{docstring}"'
def make_entry(obj, name=None, templ="{description}", description=None, params=[]):
    """
    Create a docstring key/value pair, where the key is the object name.

    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 hasattr(obj,'_parse_data') and hasattr(obj._parse_data,'definition'):
            name=obj._parse_data.definition.split(' ')[-1]
    if "operator " in name:
        return ''
    if description is None:
        description = combine_descriptions(obj)
    if params:
        description += '\n\n'
        description += utoascii(format_params(params))
    docstring = templ.format(description=description)

    return {name: docstring}


def make_class_entry(klass, description=None, ignored_methods=[], params=None):
    """
    Create a class docstring key/value pair.
    """
    if params is None:
        params = klass.params
    output = {}
    output.update(make_entry(klass, description=description, params=params))
    for func in klass.in_category(DoxyFunction):
        if func.name() not in ignored_methods:
            name = klass.name() + '::' + func.name()
            output.update(make_entry(func, name=name))
    return output


def make_block_entry(di, block):
    """
    Create class and function docstrings of a gnuradio block
    """
    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.update(make_class_entry(block, description=super_description))
    output.update(make_entry(make_func, description=super_description,
                                  params=block.params))
    return output

def make_block2_entry(di, block):
    """
    Create class and function docstrings of a new style gnuradio block
    """
    # For new style blocks all the relevant documentation should be
    # associated with the 'make' method.
    class_description = combine_descriptions(block)
    make_func = block.get_member('make', DoxyFunction)
    make_description = combine_descriptions(make_func)
    description = class_description + "\n\nConstructor Specific Documentation:\n\n" + make_description
    # Associate the combined description with the class and
    # the make function.
    output = {}
    output.update(make_class_entry(
            block, description=description,
            ignored_methods=['make'], params=make_func.params))
    makename = block.name() + '::make'
    output.update(make_entry(
            make_func, name=makename, description=description,
            params=make_func.params))
    return output

def get_docstrings_dict(di, custom_output=None):

    output = {}
    if custom_output:
        output.update(custom_output)

    # Create docstrings for the blocks.
    blocks = di.in_category(Block)
    blocks2 = di.in_category(Block2)

    make_funcs = set([])
    for block in blocks:
        try:
            make_func = di.get_member(make_name(block.name()), DoxyFunction)
            # Don't want to risk writing to output twice.
            if make_func.name() not in make_funcs:
                make_funcs.add(make_func.name())
                output.update(make_block_entry(di, block))
        except block.ParsingError:
            sys.stderr.write('Parsing error for block {0}\n'.format(block.name()))
            raise

    for block in blocks2:
        try:
            make_func = block.get_member('make', DoxyFunction)
            make_func_name = block.name() +'::make'
            # Don't want to risk writing to output twice.
            if make_func_name not in make_funcs:
                make_funcs.add(make_func_name)
                output.update(make_block2_entry(di, block))
        except block.ParsingError:
            sys.stderr.write('Parsing error for block {0}\n'.format(block.name()))
            raise

    # 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 and not f.name().startswith('std::')]
    for f in funcs:
        try:
            output.update(make_entry(f))
        except f.ParsingError:
            sys.stderr.write('Parsing error for function {0}\n'.format(f.name()))

    # Create docstrings for classes
    block_names = [block.name() for block in blocks]
    block_names += [block.name() for block in blocks2]
    klasses = [k for k in di.in_category(DoxyClass)
               if k.name() not in block_names and not k.name().startswith('std::')]
    for k in klasses:
        try:
            output.update(make_class_entry(k))
        except k.ParsingError:
            sys.stderr.write('Parsing error for class {0}\n'.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.

    return output

def sub_docstring_in_pydoc_h(pydoc_files, docstrings_dict, output_dir, filter_str=None):
    if filter_str:
        docstrings_dict = {k: v for k, v in docstrings_dict.items() if k.startswith(filter_str)}

    with open(os.path.join(output_dir,'docstring_status'),'w') as status_file:
    
        for pydoc_file in pydoc_files:
            if filter_str:
                filter_str2 = "::".join((filter_str,os.path.split(pydoc_file)[-1].split('_pydoc_template.h')[0]))
                docstrings_dict2 = {k: v for k, v in docstrings_dict.items() if k.startswith(filter_str2)}
            else:
                docstrings_dict2 = docstrings_dict



            file_in = open(pydoc_file,'r').read()
            for key, value in docstrings_dict2.items(): 
                file_in_tmp = file_in 
                try:
                    doc_key = key.split("::")
                    # if 'gr' in doc_key:
                    #     doc_key.remove('gr') 
                    doc_key = '_'.join(doc_key)
                    regexp = r'(__doc_{} =\sR\"doc\()[^)]*(\)doc\")'.format(doc_key)
                    regexp = re.compile(regexp, re.MULTILINE)
                
                    (file_in, nsubs) = regexp.subn(r'\1'+value+r'\2', file_in, count=1)
                    if nsubs == 1:
                        status_file.write("PASS: " + pydoc_file + "\n")
                except KeyboardInterrupt:
                    raise KeyboardInterrupt
                except: # be permissive, TODO log, but just leave the docstring blank
                    status_file.write("FAIL: " + pydoc_file + "\n")
                    file_in = file_in_tmp

            output_pathname = os.path.join(output_dir, os.path.basename(pydoc_file).replace('_template.h','.h'))
            # FIXME: Remove this debug print
            print('output docstrings to {}'.format(output_pathname))
            with open(output_pathname,'w') as file_out:
                file_out.write(file_in)

def copy_docstring_templates(pydoc_files, output_dir):
    with open(os.path.join(output_dir,'docstring_status'),'w') as status_file:
        for pydoc_file in pydoc_files:
            file_in = open(pydoc_file,'r').read()
            output_pathname = os.path.join(output_dir, os.path.basename(pydoc_file).replace('_template.h','.h'))
            # FIXME: Remove this debug print
            print('copy docstrings to {}'.format(output_pathname))
            with open(output_pathname,'w') as file_out:
                file_out.write(file_in)
        status_file.write("DONE")

def argParse():
    """Parses commandline args."""
    desc='Scrape the doxygen generated xml for docstrings to insert into python bindings'
    parser = ArgumentParser(description=desc)
    
    parser.add_argument("function", help="Operation to perform on docstrings", choices=["scrape","sub","copy"])

    parser.add_argument("--xml_path")
    parser.add_argument("--bindings_dir")
    parser.add_argument("--output_dir")
    parser.add_argument("--json_path")
    parser.add_argument("--filter", default=None)

    return parser.parse_args()

if __name__ == "__main__":
    # Parse command line options and set up doxyxml.
    args = argParse()
    if args.function.lower() == 'scrape':
        di = DoxyIndex(args.xml_path)
        docstrings_dict = get_docstrings_dict(di)
        with open(args.json_path, 'w') as fp:
            json.dump(docstrings_dict, fp)
    elif args.function.lower() == 'sub':
        with open(args.json_path, 'r') as fp:
            docstrings_dict = json.load(fp)
        pydoc_files = glob.glob(os.path.join(args.bindings_dir,'*_pydoc_template.h'))
        sub_docstring_in_pydoc_h(pydoc_files, docstrings_dict, args.output_dir, args.filter)
    elif args.function.lower() == 'copy':
        pydoc_files = glob.glob(os.path.join(args.bindings_dir,'*_pydoc_template.h'))
        copy_docstring_templates(pydoc_files, args.output_dir)

            
