
# Copyright 2017-present Open Networking Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import plyxproto.model as m
from plyxproto.helpers import Visitor
import pdb
import argparse
import plyxproto.parser as plyxproto
from plyxproto.logicparser import FOLParser, FOLLexer
import traceback
import sys
import jinja2
import os
import ply.lex as lex
import ply.yacc as yacc

class Stack(list):
    def push(self,x):
        self.append(x)

def str_to_dict(s):
    lst = s.rsplit('.',1)
    name = lst[-1]

    if len(lst)==2:
        package = lst[0]
    else:
        package = ''

    return {'name': name, 'package': package, 'fqn': s}


def replace_link(obj):
        try:
            link = obj.link
            try:
                through = link['through']
            except KeyError:
                through = None

            try:
                through_str = through[1:-1]
            except TypeError:
                through_str = None

            if through_str:
                through_dict = str_to_dict(through_str)
            else:
                through_dict = {}

            model_dict = str_to_dict(link['model'][1:-1])

            ls = m.LinkSpec(obj, m.LinkDefinition(link['link'][1:-1],obj.name,model_dict,link['port'][1:-1],through_dict))
            return ls
        except:
            return obj

class Proto2XProto(Visitor):
    fol_lexer = lex.lex(module=FOLLexer())
    fol_parser = yacc.yacc(module=FOLParser(), start='goal', debug=0, outputdir='/tmp')

    def __init__(self):
        super(Proto2XProto, self).__init__()

        self.stack = Stack()
        self.count_stack = Stack()
        self.content=""
        self.offset=0
        self.statementsChanged=0
        self.message_options = {}
        self.options = {}
        self.current_message_name = None

        self.xproto_message_options = ['bases']
        self.xproto_field_options = ['model']
        self.verbose = 0
        self.first_field = True
        self.first_method = True
    
    def replace_policy(self, obj):
        if isinstance(obj, m.OptionStatement):
            rhs = obj.value.value.pval
            if rhs.startswith('"') and rhs.endswith('"'):
                rhs = rhs[1:-1]

            if rhs.startswith('policy:'):
                str = rhs.split(':',1)[1]
                val = self.fol_parser.parse(str, lexer = self.fol_lexer)

                return m.PolicyDefinition(obj.name, val)

        return obj

    def proto_to_xproto_field(self, obj):
        try:
            opts = {}
            for fd in obj.fieldDirective:
                k = fd.pval.name.value.pval
                v = fd.pval.value.value.pval
                opts[k]=v

            if ('model' in opts and 'link' in opts and 'port' in opts):
                obj.link = opts
            pass
        except KeyError:
            raise

    def proto_to_xproto_message(self, obj):
        try:
            try:
                bases = self.message_options['bases'].split(',')
            except KeyError:
                bases = []

            bases = map(lambda x:str_to_dict(x[1:-1]), bases)
            obj.bases = bases
        except KeyError:
            raise

    def map_field(self, obj, s):
        if 'model' in s:
            link = m.LinkDefinition('onetoone','src','name','dst', obj.linespan, obj.lexspan, obj.p)
            lspec = m.LinkSpec(link, obj)
        else:
            lspec = obj
        return lspec


    def get_stack(self):
        return self.stack

    def visit_PackageStatement(self, obj):
        '''Ignore'''
        return True

    def visit_ImportStatement(self, obj):
        '''Ignore'''
        return True

    def visit_OptionStatement(self, obj):
        if (self.current_message_name):
            k = obj.name.value.pval
            self.message_options[k] = obj.value.value.pval
            if (k in self.xproto_message_options):
               obj.mark_for_deletion = True  
        else:
            self.options[obj.name.value.pval] = obj.value.value.pval

        return True

    def visit_LU(self, obj):
        return True

    def visit_default(self, obj):
        return True

    def visit_FieldDirective(self, obj):
        return True

    def visit_FieldDirective_post(self, obj):
        return True

    def visit_FieldType(self, obj):
        return True

    def visit_LinkDefinition(self, obj):
        return True

    def visit_FieldDefinition(self, obj):
        return True

    def visit_FieldDefinition_post(self, obj):
        self.proto_to_xproto_field(obj)
        return True

    def visit_EnumFieldDefinition(self, obj):
        return True

    def visit_EnumDefinition(self, obj):
        return True

    def visit_MessageDefinition(self, obj):
        self.current_message_name = obj.name.value.pval
        self.message_options = {}

        return True
    
    def visit_MessageDefinition_post(self, obj):
        self.proto_to_xproto_message(obj)
        obj.body = filter(lambda x:not hasattr(x, 'mark_for_deletion'), obj.body)
        obj.body = map(replace_link, obj.body)

        self.current_message_name = None
        return True

    def visit_MessageExtension(self, obj):
        return True

    def visit_MethodDefinition(self, obj):
        return True

    def visit_ServiceDefinition(self, obj):
        return True

    def visit_ExtensionsDirective(self, obj):
        return True

    def visit_Literal(self, obj):
        return True

    def visit_Name(self, obj):
        return True

    def visit_DotName(self, obj):
        return True

    def visit_Proto(self, obj):
        self.count_stack.push(len(obj.body))
        return True
    
    def visit_Proto_post(self, obj):

        obj.body = [self.replace_policy(o) for o in obj.body]
        return True

    def visit_LinkSpec(self, obj):
        return False