# Unix SMB/CIFS implementation.
# Copyright (C) 2014 Catalyst.Net Ltd
#
# Auto generate param_functions.c
#
#   ** NOTE! The following LGPL license applies to the ldb
#   ** library. This does NOT imply that all of Samba is released
#   ** under the LGPL
#
#  This library is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 3 of the License, or (at your option) any later version.
#
#  This library 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
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with this library; if not, see <http://www.gnu.org/licenses/>.
#

import errno
import os
import re
import subprocess
import xml.etree.ElementTree as ET
import sys
import optparse

# parse command line arguments
parser = optparse.OptionParser()
parser.add_option("-f", "--file", dest="filename",
                  help="input file", metavar="FILE")
parser.add_option("-o", "--output", dest="output",
                  help='output file', metavar="FILE")
parser.add_option("--mode", type="choice", metavar="<FUNCTIONS|S3PROTO|LIBPROTO|PARAMDEFS>",
                 choices=["FUNCTIONS", "S3PROTO", "LIBPROTO", "PARAMDEFS"], default="FUNCTIONS")
parser.add_option("--scope", metavar="<GLOBAL|LOCAL>",
                  choices = ["GLOBAL", "LOCAL"], default="GLOBAL")

(options, args) = parser.parse_args()

if options.filename is None:
    parser.error("No input file specified")
if options.output is None:
    parser.error("No output file specified")

def iterate_all(path):
    """Iterate and yield all the parameters. 

    :param path: path to parameters xml file
    """

    try:
        p = open(path, 'r')
    except IOError, e:
        raise Exception("Error opening parameters file")
    out = p.read()

    # parse the parameters xml file
    root = ET.fromstring(out)
    for parameter in root:
        name = parameter.attrib.get("name")
        param_type = parameter.attrib.get("type")
        context = parameter.attrib.get("context")
        func = parameter.attrib.get("function")
        synonym = parameter.attrib.get("synonym")
        removed = parameter.attrib.get("removed")
        generated = parameter.attrib.get("generated_function")
        if synonym == "1" or removed == "1" or generated == "0":
            continue
        constant = parameter.attrib.get("constant")
        parm = parameter.attrib.get("parm")
        if name is None or param_type is None or context is None:
            raise Exception("Error parsing parameter: " + name)
        if func is None:
            func = name.replace(" ", "_").lower()
        yield {'name': name,
               'type': param_type,
               'context': context,
               'function': func,
               'constant': (constant == '1'),
               'parm': (parm == '1')}

# map doc attributes to a section of the generated function
context_dict = {"G": "_GLOBAL", "S": "_LOCAL"}
param_type_dict = {"boolean": "_BOOL", "list": "_LIST", "string": "_STRING",
                   "integer": "_INTEGER", "enum": "_INTEGER", "char" : "_CHAR",
                   "boolean-auto": "_INTEGER"}

def generate_functions(path_in, path_out):
    f = open(path_out, 'w')
    try:
       f.write('/* This file was automatically generated by generate_param.py. DO NOT EDIT */\n\n')
       for parameter in iterate_all(options.filename):
            # filter out parameteric options
            if ':' in parameter['name']:
                continue
            output_string = "FN"
            temp = context_dict.get(parameter['context'])
            if temp is None: 
                raise Exception(parameter['name'] + " has an invalid context " + parameter['context'])
            output_string += temp
            if parameter['constant']:
                output_string += "_CONST"
            if parameter['parm']: 
                output_string += "_PARM"
            temp = param_type_dict.get(parameter['type'])
            if temp is None:
                raise Exception(parameter['name'] + " has an invalid param type " + parameter['type'])
            output_string += temp
            f.write(output_string + "(" + parameter['function'] +", " + parameter['function'] + ')\n')
    finally:
        f.close()

mapping = {'boolean': 'bool ', 'string': 'char *', 'integer': 'int ', 'char': 'char ',
           'list': 'const char **', 'enum': 'int ', 'boolean-auto': 'int '}

def make_s3_param_proto(path_in, path_out):
    file_out = open(path_out, 'w')
    try:
        file_out.write('/* This file was automatically generated by generate_param.py. DO NOT EDIT */\n\n')
        header = get_header(path_out)
        file_out.write("#ifndef %s\n" % header)
        file_out.write("#define %s\n\n" % header)
        for parameter in iterate_all(path_in):
            # filter out parameteric options
            if ':' in parameter['name']:
                continue

            output_string = ""
            if parameter['constant']:
                output_string += 'const '
            param_type = mapping.get(parameter['type'])
            if param_type is None:
               raise Exception(parameter['name'] + " has an invalid context " + parameter['context'])
            output_string += param_type
            output_string += "lp_%s" % parameter['function']

            param = None
            if parameter['parm']:
                param = "const struct share_params *p"
            else:
                param = "int"

            if parameter['type'] == 'string' and not parameter['constant']:
                if parameter['context'] == 'G':
                    output_string += '(TALLOC_CTX *ctx);\n'
                elif parameter['context'] == 'S':
                    output_string += '(TALLOC_CTX *ctx, %s);\n' % param
                else:
                    raise Exception(parameter['name'] + " has an invalid param type " + parameter['type'])
            else:
                if parameter['context'] == 'G':
                    output_string += '(void);\n'
                elif parameter['context'] == 'S':
                    output_string += '(%s);\n' % param
                else:
                    raise Exception(parameter['name'] + " has an invalid param type " + parameter['type'])

            file_out.write(output_string)

        file_out.write("\n#endif /* %s */\n\n" % header)
    finally:
        file_out.close()


def make_lib_proto(path_in, path_out):
    file_out = open(path_out, 'w')
    try:
        file_out.write('/* This file was automatically generated by generate_param.py. DO NOT EDIT */\n\n')
        for parameter in iterate_all(path_in):
            # filter out parameteric options
            if ':' in parameter['name']:
                continue

            output_string = ""
            if parameter['constant']:
                output_string += 'const '
            param_type = mapping.get(parameter['type'])
            if param_type is None:
               raise Exception(parameter['name'] + " has an invalid context " + parameter['context'])
            output_string += param_type

            output_string += "lpcfg_%s" % parameter['function']

            if parameter['type'] == 'string' and not parameter['constant']:
                if parameter['context'] == 'G':
                    output_string += '(struct loadparm_context *, TALLOC_CTX *ctx);\n'
                elif parameter['context'] == 'S':
                    output_string += '(struct loadparm_service *, struct loadparm_service *, TALLOC_CTX *ctx);\n'
                else:
                    raise Exception(parameter['name'] + " has an invalid param type " + parameter['type'])
            else:
                if parameter['context'] == 'G':
                    output_string += '(struct loadparm_context *);\n'
                elif parameter['context'] == 'S':
                    output_string += '(struct loadparm_service *, struct loadparm_service *);\n'
                else:
                    raise Exception(parameter['name'] + " has an invalid param type " + parameter['type'])

            
            file_out.write(output_string)
    finally:
        file_out.close()

def get_header(path):
    header = os.path.basename(path).upper()
    header = header.replace(".", "_").replace("\\", "_").replace("-", "_")
    return "__%s__" % header

def make_param_defs(path_in, path_out, scope):
    file_out = open(path_out, 'w')
    try:
        file_out.write('/* This file was automatically generated by generate_param.py. DO NOT EDIT */\n\n')
        header = get_header(path_out)
        file_out.write("#ifndef %s\n" % header)
        file_out.write("#define %s\n\n" % header)
        if scope == "GLOBAL": 
            file_out.write("/**\n")
            file_out.write(" * This structure describes global (ie., server-wide) parameters.\n")
            file_out.write(" */\n")
            file_out.write("struct loadparm_global \n")
            file_out.write("{\n")
            file_out.write("\tTALLOC_CTX *ctx; /* Context for talloced members */\n")
            file_out.write("\tchar *  dnsdomain;\n")
        elif scope == "LOCAL":
            file_out.write("/**\n")
            file_out.write(" * This structure describes a single service.\n")
            file_out.write(" */\n")
            file_out.write("struct loadparm_service \n")
            file_out.write("{\n")
            file_out.write("\tbool   autoloaded;\n")
 
        for parameter in iterate_all(path_in):
            # filter out parameteric options
            if ':' in parameter['name']:
                continue

            if (scope == "GLOBAL" and parameter['context'] != "G" or
                scope == "LOCAL" and parameter['context'] != "S"):
                continue

            output_string = "\t"
            param_type = mapping.get(parameter['type'])
            if param_type is None:
               raise Exception(parameter['name'] + " has an invalid context " + parameter['context'])
            output_string += param_type

            output_string += "  %s;\n" % parameter['function']
            file_out.write(output_string)

        file_out.write("LOADPARM_EXTRA_%sS\n" % scope)
        file_out.write("};\n")
        file_out.write("\n#endif /* %s */\n\n" % header)
    finally:
        file_out.close()

if options.mode == 'FUNCTIONS':
    generate_functions(options.filename, options.output)
elif options.mode == 'S3PROTO':
    make_s3_param_proto(options.filename, options.output)
elif options.mode == 'LIBPROTO':
    make_lib_proto(options.filename, options.output)
elif options.mode == 'PARAMDEFS':
    make_param_defs(options.filename, options.output, options.scope)