%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(asn1ct_gen_per).

%% Generate erlang module which handles (PER) encode and decode for
%% all types in an ASN.1 module

-include("asn1_records.hrl").
%-compile(export_all).

-export([pgen/4,gen_dec_prim/3,gen_encode_prim/4]).
-export([gen_obj_code/3,gen_objectset_code/2]).
-export([gen_decode/2, gen_decode/3]).
-export([gen_encode/2, gen_encode/3]).
-export([is_already_generated/2,more_genfields/1,get_class_fields/1,
	 get_object_field/2]).
-export([extaddgroup2sequence/1]).

-import(asn1ct_gen, [emit/1,demit/1]).

%% pgen(Erules, Module, TypeOrVal)
%% Generate Erlang module (.erl) and (.hrl) file corresponding to an ASN.1 module
%% .hrl file is only generated if necessary
%% Erules = per | ber
%% Module = atom()
%% TypeOrVal = {TypeList,ValueList}
%% TypeList = ValueList = [atom()]

pgen(OutFile,Erules,Module,TypeOrVal) ->
    asn1ct_gen:pgen_module(OutFile,Erules,Module,TypeOrVal,[],true).


%% Generate ENCODING ******************************
%%****************************************x


gen_encode(Erules,Type) when is_record(Type,typedef) ->
    gen_encode_user(Erules,Type).
%%    case Type#typedef.typespec of
%%	Def when is_record(Def,type) ->	    
%%	    gen_encode_user(Erules,Type);
%%	Def when is_tuple(Def),(element(1,Def) == 'Object') ->
%%	    gen_encode_object(Erules,Type);
%%	Other ->
%%	    exit({error,{asn1,{unknown,Other}}})
%%    end.

gen_encode(Erules,Typename,#'ComponentType'{name=Cname,typespec=Type}) ->
    NewTypename = [Cname|Typename],
    gen_encode(Erules,NewTypename,Type);

gen_encode(Erules,Typename,Type) when is_record(Type,type) ->
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    ObjFun =
	case lists:keysearch(objfun,1,Type#type.tablecinf) of
	    {value,{_,_Name}} ->
%%		lists:concat([", ObjFun",Name]);
		", ObjFun";
	    false ->
		""
	end,
    case asn1ct_gen:type(InnerType) of
	{constructed,bif} ->
	    case InnerType of
		'SET' ->
		    true;
		'SEQUENCE' ->
		    true;
		_ ->
		    emit({nl,"'enc_",asn1ct_gen:list2name(Typename),
			  "'({'",asn1ct_gen:list2name(Typename),
			  "',Val}",ObjFun,") ->",nl}),
		    emit({"'enc_",asn1ct_gen:list2name(Typename),
			  "'(Val",ObjFun,");",nl,nl})
	    end,
	    emit({"'enc_",asn1ct_gen:list2name(Typename),"'(Val",ObjFun,
		  ") ->",nl}),
	    asn1ct_gen:gen_encode_constructed(Erules,Typename,InnerType,Type);
	_ ->
	    true
    end.


gen_encode_user(Erules,D) when is_record(D,typedef) ->
    CurrMod = get(currmod),
    Typename = [D#typedef.name],
    Def = D#typedef.typespec,
    InnerType = asn1ct_gen:get_inner(Def#type.def),
    case InnerType of
	'SET' -> true;
	'SEQUENCE' -> true;
	_ ->
	    emit({nl,"'enc_",asn1ct_gen:list2name(Typename),"'({'",asn1ct_gen:list2name(Typename),"',Val}) ->",nl}),
	    emit({"'enc_",asn1ct_gen:list2name(Typename),"'(Val);",nl,nl})
    end,
    emit({"'enc_",asn1ct_gen:list2name(Typename),"'(Val) ->",nl}),
    case asn1ct_gen:type(InnerType) of
	{primitive,bif} ->
	    gen_encode_prim(Erules,Def,"false"),
	    emit({".",nl});
	'ASN1_OPEN_TYPE' ->
	    gen_encode_prim(Erules,Def#type{def='ASN1_OPEN_TYPE'},"false"),
	    emit({".",nl});
	{constructed,bif} ->
	    asn1ct_gen:gen_encode_constructed(Erules,Typename,InnerType,D);
	#'Externaltypereference'{module=CurrMod,type=Etype} ->
	    emit({"'enc_",Etype,"'(Val).",nl,nl});
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit({"'",Emod,"':'enc_",Etype,"'(Val).",nl,nl});
	#typereference{val=Ename} ->
	    emit({"'enc_",Ename,"'(Val).",nl,nl});
	{notype,_} ->
	    emit({"'enc_",InnerType,"'(Val).",nl,nl})
    end.


gen_encode_prim(Erules,D,DoTag) ->
    Value = case asn1ct_name:active(val) of
		true ->
		    asn1ct_gen:mk_var(asn1ct_name:curr(val));
		false ->
		    "Val"
	    end,
    gen_encode_prim(Erules,D,DoTag,Value).

gen_encode_prim(Erules,D,DoTag,Value) when is_record(D,type) ->
    Constraint = D#type.constraint,
    asn1ct_name:new(enumval),
    case D#type.def of
	'INTEGER' ->
	    emit({"?RT_PER:encode_integer(", %fel
		  {asis,effective_constraint(integer,Constraint)},",",Value,")"});
	{'INTEGER',NamedNumberList} ->
	    emit({"?RT_PER:encode_integer(",
		  {asis,effective_constraint(integer,Constraint)},",",Value,",",
		  {asis,NamedNumberList},")"});
	{'ENUMERATED',{Nlist1,Nlist2}} ->
	    NewList = lists:concat([[{0,X}||{X,_} <- Nlist1],['EXT_MARK'],[{1,X}||{X,_} <- Nlist2]]),
	    NewC = [{'ValueRange',{0,length(Nlist1)-1}}],
	    case Erules of
		uper_bin ->
		    emit(["case ",Value," of",nl]);
		_ ->
		    emit(["case (case ",Value," of {_,",{curr,enumval},"}-> ",
			  {curr,enumval},";_->", Value," end) of",nl]),
		    asn1ct_name:new(enumval)
	    end,
%%	    emit_enc_enumerated_cases(Erules,NewC, NewList++[{asn1_enum,length(Nlist1)-1}], 0);
	    emit_enc_enumerated_cases(Erules,NewC, NewList, 0);
	{'ENUMERATED',NamedNumberList} ->
	    NewList = [X||{X,_} <- NamedNumberList],
	    NewC = [{'ValueRange',{0,length(NewList)-1}}],
	    case Erules of
		uper_bin ->
		    emit(["case ",Value," of",nl]);
		_ ->
		    emit(["case (case ",Value," of {_,",{curr,enumval},
			  "}->",{curr,enumval},";_->",Value," end) of",nl])
	    end,
	    emit_enc_enumerated_cases(Erules,NewC, NewList, 0);
	
	'REAL' ->
	    emit({"?RT_PER:encode_real(",Value,")"});

	{'BIT STRING',NamedNumberList} ->
	    emit({"?RT_PER:encode_bit_string(",
		  {asis,Constraint},",",Value,",",
		  {asis,NamedNumberList},")"});
	'NULL' ->
	    emit({"?RT_PER:encode_null(",Value,")"});
	'OBJECT IDENTIFIER' ->
	    emit({"?RT_PER:encode_object_identifier(",Value,")"});
	'RELATIVE-OID' ->
	    emit({"?RT_PER:encode_relative_oid(",Value,")"});
	'ObjectDescriptor' ->
	    emit({"?RT_PER:encode_ObjectDescriptor(",{asis,Constraint},
		  ",",Value,")"});
	'BOOLEAN' ->
	    emit({"?RT_PER:encode_boolean(",Value,")"});
	'OCTET STRING' ->
	    emit({"?RT_PER:encode_octet_string(",{asis,Constraint},",",Value,")"});
	'NumericString' ->
	    emit({"?RT_PER:encode_NumericString(",{asis,Constraint},",",Value,")"});
	TString when TString == 'TeletexString';
		     TString == 'T61String' ->
	    emit({"?RT_PER:encode_TeletexString(",{asis,Constraint},",",Value,")"});
	'VideotexString' ->
	    emit({"?RT_PER:encode_VideotexString(",{asis,Constraint},",",Value,")"});
	'UTCTime' ->
	    emit({"?RT_PER:encode_VisibleString(",{asis,Constraint},",",Value,")"});
	'GeneralizedTime' ->
	    emit({"?RT_PER:encode_VisibleString(",{asis,Constraint},",",Value,")"});
	'GraphicString' ->
	    emit({"?RT_PER:encode_GraphicString(",{asis,Constraint},",",Value,")"});
	'VisibleString' ->
	    emit({"?RT_PER:encode_VisibleString(",{asis,Constraint},",",Value,")"});
	'GeneralString' ->
	    emit({"?RT_PER:encode_GeneralString(",{asis,Constraint},
		  ",",Value,")"});
	'PrintableString' ->
	    emit({"?RT_PER:encode_PrintableString(",{asis,Constraint},
		  ",",Value,")"});
	'IA5String' ->
	    emit({"?RT_PER:encode_IA5String(",{asis,Constraint},
		  ",",Value,")"});
	'BMPString' ->
	    emit({"?RT_PER:encode_BMPString(",{asis,Constraint},
		  ",",Value,")"});
	'UniversalString' ->
	    emit({"?RT_PER:encode_UniversalString(",{asis,Constraint},
		  ",",Value,")"});
	'UTF8String' ->
	    emit({"?RT_PER:encode_UTF8String(",Value,")"});
	'ANY' ->
	    emit(["?RT_PER:encode_open_type(", {asis,Constraint}, ",", 
		  Value, ")"]);
	'ASN1_OPEN_TYPE' ->
	    NewValue = case Constraint of
			   [#'Externaltypereference'{type=Tname}] ->
			     io_lib:format(
			       "?RT_PER:complete(enc_~s(~s))",[Tname,Value]);
			   [#type{def=#'Externaltypereference'{type=Tname}}] ->
			       io_lib:format(
				 "?RT_PER:complete(enc_~s(~s))",
				 [Tname,Value]);
			 _ -> Value
		     end,
	    emit(["?RT_PER:encode_open_type(", {asis,Constraint}, ",", 
		  NewValue, ")"]);
	#'ObjectClassFieldType'{} ->
	    case asn1ct_gen:get_inner(D#type.def) of
		{fixedtypevaluefield,_,InnerType} -> 
		    gen_encode_prim(Erules,InnerType,DoTag,Value);
		T -> %% 'ASN1_OPEN_TYPE'
		    gen_encode_prim(Erules,D#type{def=T},DoTag,Value)
	    end;
	XX ->
	    exit({asn1_error,nyi,XX})
    end.


emit_enc_enumerated_cases(Erule,C, [H], Count) ->
    emit_enc_enumerated_case(Erule,C, H, Count),
    case H of
	'EXT_MARK' -> ok;
	_ ->
	    emit([";",nl])
    end,
    emit([nl,"EnumVal -> exit({error,{asn1, {enumerated_not_in_range, EnumVal}}})"]),
    emit([nl,"end"]);
emit_enc_enumerated_cases(Erule, C, ['EXT_MARK'|T], _Count) ->
    emit_enc_enumerated_cases(Erule, C, T, 0);
emit_enc_enumerated_cases(Erule, C, [H1,H2|T], Count) ->
    emit_enc_enumerated_case(Erule, C, H1, Count),
    emit([";",nl]),
    emit_enc_enumerated_cases(Erule, C, [H2|T], Count+1).
    


emit_enc_enumerated_case(uper_bin,_C, {asn1_enum,High}, _) ->
    emit([
	  "{asn1_enum,EnumV} when is_integer(EnumV), EnumV > ",High," -> ",
	  "[<<1:1>>,?RT_PER:encode_small_number(EnumV)]"]);
emit_enc_enumerated_case(_Per,_C, {asn1_enum,High}, _) ->
    emit([
	  "{asn1_enum,EnumV} when is_integer(EnumV), EnumV > ",High," -> ",
	  "[{bit,1},?RT_PER:encode_small_number(EnumV)]"]);
emit_enc_enumerated_case(_Erule, _C, 'EXT_MARK', _Count) ->
    true;
emit_enc_enumerated_case(uper_bin,_C, {1,EnumName}, Count) ->
    emit(["'",EnumName,"' -> [<<1:1>>,?RT_PER:encode_small_number(",Count,")]"]);
emit_enc_enumerated_case(_Per,_C, {1,EnumName}, Count) ->
    emit(["'",EnumName,"' -> [{bit,1},?RT_PER:encode_small_number(",Count,")]"]);
emit_enc_enumerated_case(uper_bin,C, {0,EnumName}, Count) ->
    emit(["'",EnumName,"' -> [<<0:1>>,?RT_PER:encode_integer(",{asis,C},", ",Count,")]"]);
emit_enc_enumerated_case(_Per,C, {0,EnumName}, Count) ->
    emit(["'",EnumName,"' -> [{bit,0},?RT_PER:encode_integer(",{asis,C},", ",Count,")]"]);
emit_enc_enumerated_case(_Erule, C, EnumName, Count) ->
    emit(["'",EnumName,"' -> ?RT_PER:encode_integer(",{asis,C},", ",Count,")"]).

%% effective_constraint(Type,C)
%% Type = atom()
%% C = [C1,...]
%% C1 = {'SingleValue',SV} | {'ValueRange',VR} | {atom(),term()}
%% SV = integer() | [integer(),...]
%% VR = {Lb,Ub}
%% Lb = 'MIN' | integer()
%% Ub = 'MAX' | integer()
%% Returns a single value if C only has a single value constraint, and no
%% value range constraints, that constrains to a single value, otherwise 
%% returns a value range that has the lower bound set to the lowest value 
%% of all single values and lower bound values in C and the upper bound to
%% the greatest value.
effective_constraint(integer,[C={{_,_},_}|_Rest]) -> % extension
    [C]; %% [C|effective_constraint(integer,Rest)]; XXX what is possible ???
effective_constraint(integer,C) ->
    SVs = get_constraints(C,'SingleValue'),
    SV = effective_constr('SingleValue',SVs),
    VRs = get_constraints(C,'ValueRange'),
    VR = effective_constr('ValueRange',VRs),
    greatest_common_range(SV,VR).

effective_constr(_,[]) ->
    [];
effective_constr('SingleValue',List) ->
    SVList = lists:flatten(lists:map(fun(X)->element(2,X)end,List)),
    %% Sort and remove duplicates before generating SingleValue or ValueRange
    %% In case of ValueRange, also check for 'MIN and 'MAX'
    case lists:usort(SVList) of
	[N] ->
	    [{'SingleValue',N}];
	L when is_list(L) ->
	    [{'ValueRange',{least_Lb(L),greatest_Ub(L)}}]
    end;
effective_constr('ValueRange',List) ->
    LBs = lists:map(fun({_,{Lb,_}})-> Lb end,List),
    UBs = lists:map(fun({_,{_,Ub}})-> Ub end,List),
    Lb = least_Lb(LBs),
    [{'ValueRange',{Lb,lists:max(UBs)}}].

greatest_common_range([],VR) ->
    VR;
greatest_common_range(SV,[]) ->
    SV;
greatest_common_range(SV,VR) ->
    greatest_common_range2(mk_vr(SV),mk_vr(VR)).
greatest_common_range2({_,Int},{'MIN',Ub}) when is_integer(Int),
						       Int > Ub ->
    [{'ValueRange',{'MIN',Int}}];
greatest_common_range2({_,Int},{Lb,Ub}) when is_integer(Int),
						    Int < Lb ->
    [{'ValueRange',{Int,Ub}}];
greatest_common_range2({_,Int},VR={_Lb,_Ub}) when is_integer(Int) ->
    [{'ValueRange',VR}];
greatest_common_range2({_,L},{Lb,Ub}) when is_list(L) ->
    Min = least_Lb([Lb|L]),
    Max = greatest_Ub([Ub|L]),
    [{'ValueRange',{Min,Max}}];
greatest_common_range2({Lb1,Ub1},{Lb2,Ub2}) ->
    Min = least_Lb([Lb1,Lb2]),
    Max = greatest_Ub([Ub1,Ub2]),
    [{'ValueRange',{Min,Max}}].

mk_vr([{Type,I}]) when is_atom(Type), is_integer(I) ->
    {I,I};
mk_vr([{Type,{Lb,Ub}}]) when is_atom(Type) ->
    {Lb,Ub};
mk_vr(Other) ->
    Other.

least_Lb(L) ->
    case lists:member('MIN',L) of
	true -> 'MIN';
	_ -> lists:min(L)
    end.

greatest_Ub(L) ->
    case lists:member('MAX',L) of
	true -> 'MAX';
	_ -> lists:max(L)
    end.


get_constraints(L=[{Key,_}],Key) ->
    L;
get_constraints([],_) ->
    [];
get_constraints(C,Key) ->
    {value,L} = keysearch_allwithkey(Key,1,C,[]),
    L.

keysearch_allwithkey(Key,Ix,C,Acc) ->
    case lists:keysearch(Key,Ix,C) of
	false ->
	    {value,Acc};
	{value,T} ->
	    RestC = lists:delete(T,C),
	    keysearch_allwithkey(Key,Ix,RestC,[T|Acc])
    end.


%% Object code generating for encoding and decoding
%% ------------------------------------------------

gen_obj_code(Erules,_Module,Obj) when is_record(Obj,typedef) ->
    ObjName = Obj#typedef.name,
    Def = Obj#typedef.typespec,
    #'Externaltypereference'{module=Mod,type=ClassName} = 
	Def#'Object'.classname,
    Class = asn1_db:dbget(Mod,ClassName),
    {object,_,Fields} = Def#'Object'.def,
    emit({nl,nl,nl,"%%================================"}),
    emit({nl,"%%  ",ObjName}),
    emit({nl,"%%================================",nl}),
    EncConstructed =
	gen_encode_objectfields(Erules, ClassName,get_class_fields(Class),
				ObjName,Fields,[]),
    emit(nl),
    gen_encode_constr_type(Erules,EncConstructed),
    emit(nl),
    DecConstructed =
	gen_decode_objectfields(ClassName,get_class_fields(Class),
				ObjName,Fields,[]),
    emit(nl),
    gen_decode_constr_type(Erules,DecConstructed),
    emit(nl);
gen_obj_code(_,_,Obj) when is_record(Obj,pobjectdef) ->
    ok.


gen_encode_objectfields(Erule,ClassName,[{typefield,Name,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    EmitFuncClause = 
	fun(V) ->
		emit(["'enc_",ObjName,"'(",{asis,Name},
		      ",",V,",_RestPrimFieldName) ->",nl])
	end,
%     emit(["'enc_",ObjName,"'(",{asis,Name},
% 	  ", Val, _RestPrimFieldName) ->",nl]),
    MaybeConstr =
	case {get_object_field(Name,ObjectFields),OptOrMand} of
	    {false,'MANDATORY'} -> %% this case is illegal
		exit({error,{asn1,{"missing mandatory field in object",
				   ObjName}}});
	    {false,'OPTIONAL'} ->
		EmitFuncClause("Val"),
		case Erule of
		    uper_bin ->
			emit("   Val");
		    _ ->
			emit("   [{octets,Val}]")
		end,
		[];
	    {false,{'DEFAULT',DefaultType}} ->
		EmitFuncClause("Val"),
		gen_encode_default_call(ClassName,Name,DefaultType);
	    {{Name,TypeSpec},_} ->
		%% A specified field owerwrites any 'DEFAULT' or
		%% 'OPTIONAL' field in the class
		EmitFuncClause("Val"),
		gen_encode_field_call(ObjName,Name,TypeSpec)
	end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_encode_objectfields(Erule,ClassName,Rest,ObjName,ObjectFields,
			    MaybeConstr++ConstrAcc);
gen_encode_objectfields(Erule,ClassName,[{objectfield,Name,_,_,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    CurrentMod = get(currmod),
    EmitFuncClause =
	fun(Attrs) ->
		emit(["'enc_",ObjName,"'(",{asis,Name},
		      ",",Attrs,") ->",nl])
	end,
%     emit(["'enc_",ObjName,"'(",{asis,Name},
% 	  ", Val,[H|T]) ->",nl]),
    case {get_object_field(Name,ObjectFields),OptOrMand} of
	{false,'MANDATORY'} ->
	    exit({error,{asn1,{"missing mandatory field in object",
			       ObjName}}});
	{false,'OPTIONAL'} ->
	    EmitFuncClause("_,_"),
	    emit(["  exit({error,{'use of missing field in object', ",{asis,Name},
		  "}})"]);
	{false,{'DEFAULT',_DefaultObject}} ->
	    exit({error,{asn1,{"not implemented yet",Name}}});
	{{Name,#'Externalvaluereference'{module=CurrentMod,
					 value=TypeName}},_} ->
	    EmitFuncClause(" Val, [H|T]"),
	    emit({indent(3),"'enc_",TypeName,"'(H, Val, T)"});
	{{Name,#'Externalvaluereference'{module=M,value=TypeName}},_} ->
	    EmitFuncClause(" Val, [H|T]"),
	    emit({indent(3),"'",M,"':'enc_",TypeName,"'(H, Val, T)"});
	{{Name,TypeSpec},_} ->
	    EmitFuncClause("Val,[H|T]"),
	    case TypeSpec#typedef.name of
		{ExtMod,TypeName} ->
		    emit({indent(3),"'",ExtMod,"':'enc_",TypeName,
			  "'(H, Val, T)"});
		TypeName ->
		    emit({indent(3),"'enc_",TypeName,"'(H, Val, T)"})
	    end
    end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_encode_objectfields(Erule,ClassName,Rest,ObjName,ObjectFields,ConstrAcc);
gen_encode_objectfields(Erule,ClassName,[_C|Cs],O,OF,Acc) ->
    gen_encode_objectfields(Erule,ClassName,Cs,O,OF,Acc);
gen_encode_objectfields(_, _,[],_,_,Acc) ->
    Acc.


gen_encode_constr_type(Erules,[TypeDef|Rest]) when is_record(TypeDef,typedef) ->
    case is_already_generated(enc,TypeDef#typedef.name) of
	true -> ok;
	_ ->
%%	    FuncName = list_to_atom(lists:concat(["enc_",TypeDef#typedef.name])),
	    FuncName = asn1ct_gen:list2rname(TypeDef#typedef.name ++ [enc]),
	    emit(["'",FuncName,"'(Val) ->",nl]),
	    Def = TypeDef#typedef.typespec,
	    InnerType = asn1ct_gen:get_inner(Def#type.def),
	    asn1ct_gen:gen_encode_constructed(Erules,TypeDef#typedef.name,
					      InnerType,Def),
	    gen_encode_constr_type(Erules,Rest)
    end;
gen_encode_constr_type(_,[]) ->
    ok.

gen_encode_field_call(_ObjName,_FieldName,
		      #'Externaltypereference'{module=M,type=T}) ->
    CurrentMod = get(currmod),
    if
	M == CurrentMod ->
	    emit({"   'enc_",T,"'(Val)"}),
	    [];
	true ->
	    emit({"   '",M,"':'enc_",T,"'(Val)"}),
	    []
    end;
gen_encode_field_call(ObjName,FieldName,Type) ->
    Def = Type#typedef.typespec,
    case Type#typedef.name of
	{primitive,bif} -> 
	    gen_encode_prim(per,Def,"false",
			    "Val"),
	    [];
	{constructed,bif} ->
	    emit({"   'enc_",ObjName,'_',FieldName,
		  "'(Val)"}),
%%	    [Type#typedef{name=list_to_atom(lists:concat([ObjName,'_',FieldName]))}];
	    [Type#typedef{name=[FieldName,ObjName]}];
	{ExtMod,TypeName} ->
	    emit({"   '",ExtMod,"':'enc_",TypeName,
		  "'(Val)"}),
	    [];
	TypeName ->
	    emit({"   'enc_",TypeName,"'(Val)"}),
	    []
    end.

gen_encode_default_call(ClassName,FieldName,Type) ->
    CurrentMod = get(currmod),
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    case asn1ct_gen:type(InnerType) of
    	{constructed,bif} ->
%%	    asn1ct_gen:gen_encode_constructed(Erules,Typename,InnerType,Type);
	    emit(["   'enc_",ClassName,'_',FieldName,"'(Val)"]),
%%	    [#typedef{name=list_to_atom(lists:concat([ClassName,'_',FieldName])),
	    [#typedef{name=[FieldName,ClassName],
		      typespec=Type}];
	{primitive,bif} ->
	    gen_encode_prim(per,Type,"false","Val"),
	    [];
	#'Externaltypereference'{module=CurrentMod,type=Etype} ->
	    emit(["   'enc_",Etype,"'(Val)",nl]),
	    [];
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit(["   '",Emod,"':'enc_",Etype,"'(Val)",nl]),
	    []
    end.
    

gen_decode_objectfields(ClassName,[{typefield,Name,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    EmitFuncClause = 
	fun(Bytes) ->
		emit(["'dec_",ObjName,"'(",{asis,Name},",",Bytes,
		      ",_,_RestPrimFieldName) ->",nl])
	end,
    MaybeConstr=
	case {get_object_field(Name,ObjectFields),OptOrMand} of
	    {false,'MANDATORY'} -> %% this case is illegal
		exit({error,{asn1,{"missing mandatory field in object",
				   ObjName}}});
	    {false,'OPTIONAL'} ->
		EmitFuncClause("Bytes"),
		emit(["   {Bytes,[]}"]),
		[];
	    {false,{'DEFAULT',DefaultType}} ->
		EmitFuncClause("Bytes"),
		gen_decode_default_call(ClassName,Name,"Bytes",DefaultType);
	    {{Name,TypeSpec},_} ->
		%% A specified field owerwrites any 'DEFAULT' or
		%% 'OPTIONAL' field in the class
		EmitFuncClause("Bytes"),
		gen_decode_field_call(ObjName,Name,"Bytes",TypeSpec)
	end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_decode_objectfields(ClassName,Rest,ObjName,ObjectFields,MaybeConstr++ConstrAcc);
gen_decode_objectfields(ClassName,[{objectfield,Name,_,_,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    CurrentMod = get(currmod),
    EmitFuncClause =
	fun(Attrs) ->
		emit(["'dec_",ObjName,"'(",{asis,Name},
		      ",",Attrs,") ->",nl])
	end,
%     emit(["'dec_",ObjName,"'(",{asis,Name},
% 	  ", Bytes,_,[H|T]) ->",nl]),
    case {get_object_field(Name,ObjectFields),OptOrMand} of
	{false,'MANDATORY'} ->
	    exit({error,{asn1,{"missing mandatory field in object",
			       ObjName}}});
	{false,'OPTIONAL'} ->
	    EmitFuncClause("_,_,_"),
	    emit(["  exit({error,{'illegal use of missing field in object', ",{asis,Name},
		  "}})"]);
	{false,{'DEFAULT',_DefaultObject}} ->
	    exit({error,{asn1,{"not implemented yet",Name}}});
	{{Name,#'Externalvaluereference'{module=CurrentMod,
					 value=TypeName}},_} ->
	    EmitFuncClause("Bytes,_,[H|T]"),
	    emit({indent(3),"'dec_",TypeName,"'(H, Bytes, telltype, T)"});
	{{Name,#'Externalvaluereference'{module=M,value=TypeName}},_} ->
	    EmitFuncClause("Bytes,_,[H|T]"),
	    emit({indent(3),"'",M,"':'dec_",TypeName,
		  "'(H, Bytes, telltype, T)"});
	{{Name,TypeSpec},_} ->
	    EmitFuncClause("Bytes,_,[H|T]"),
	    case TypeSpec#typedef.name of
		{ExtMod,TypeName} ->
		    emit({indent(3),"'",ExtMod,"':'dec_",TypeName,
			  "'(H, Bytes, telltype, T)"});
		TypeName ->
		    emit({indent(3),"'dec_",TypeName,"'(H, Bytes, telltype, T)"})
	    end
    end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_decode_objectfields(ClassName,Rest,ObjName,ObjectFields,ConstrAcc);
gen_decode_objectfields(CN,[_C|Cs],O,OF,CAcc) ->
    gen_decode_objectfields(CN,Cs,O,OF,CAcc);
gen_decode_objectfields(_,[],_,_,CAcc) ->
    CAcc.



gen_decode_field_call(_ObjName,_FieldName,Bytes,
		      #'Externaltypereference'{module=M,type=T}) ->
    CurrentMod = get(currmod),
    if
	M == CurrentMod ->
	    emit(["   'dec_",T,"'(",Bytes,", telltype)"]),
	    [];
	true ->
	    emit(["   '",M,"':'dec_",T,"'(",Bytes,", telltype)"]),
	    []
    end;
gen_decode_field_call(ObjName,FieldName,Bytes,Type) ->
    Def = Type#typedef.typespec,
    case Type#typedef.name of
	{primitive,bif} -> 
	    gen_dec_prim(per,Def,Bytes),
	    [];
	{constructed,bif} ->
	    emit({"   'dec_",ObjName,'_',FieldName,
		  "'(",Bytes,",telltype)"}),
%%	    [Type#typedef{name=list_to_atom(lists:concat([ObjName,'_',FieldName]))}];
	    [Type#typedef{name=[FieldName,ObjName]}];
	{ExtMod,TypeName} ->
	    emit({"   '",ExtMod,"':'dec_",TypeName,
		  "'(",Bytes,", telltype)"}),
	    [];
	TypeName ->
	    emit({"   'dec_",TypeName,"'(",Bytes,", telltype)"}),
	    []
    end.

gen_decode_default_call(ClassName,FieldName,Bytes,Type) ->
    CurrentMod = get(currmod),
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    case asn1ct_gen:type(InnerType) of
    	{constructed,bif} ->
	    emit(["   'dec_",ClassName,'_',FieldName,"'(",Bytes,", telltype)"]),
%%	    [#typedef{name=list_to_atom(lists:concat([ClassName,'_',FieldName])),
	    [#typedef{name=[FieldName,ClassName],
		      typespec=Type}];
	{primitive,bif} ->
	    gen_dec_prim(per,Type,Bytes),
	    [];
	#'Externaltypereference'{module=CurrentMod,type=Etype} ->
	    emit(["   'dec_",Etype,"'(",Bytes,", telltype)",nl]),
	    [];
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit(["   '",Emod,"':'dec_",Etype,"'(",Bytes,", telltype)",nl]),
	    []
    end.


gen_decode_constr_type(Erules,[TypeDef|Rest]) when is_record(TypeDef,typedef) ->
    case is_already_generated(dec,TypeDef#typedef.name) of
	true -> ok;
	_ ->
	    gen_decode(Erules,TypeDef#typedef{name=asn1ct_gen:list2rname(TypeDef#typedef.name)})
    end,
    gen_decode_constr_type(Erules,Rest);
gen_decode_constr_type(_,[]) ->
    ok.


more_genfields([]) ->
    false;
more_genfields([Field|Fields]) ->
    case element(1,Field) of
	typefield ->
	    true;
	objectfield ->
	    true;
	_ ->
	    more_genfields(Fields)
    end.

%% Object Set code generating for encoding and decoding
%% ----------------------------------------------------
gen_objectset_code(Erules,ObjSet) ->
    ObjSetName = ObjSet#typedef.name,
    Def = ObjSet#typedef.typespec,
%%    {ClassName,ClassDef} = Def#'ObjectSet'.class,
    #'Externaltypereference'{module=ClassModule,
			     type=ClassName} = Def#'ObjectSet'.class,
    ClassDef = asn1_db:dbget(ClassModule,ClassName),
    UniqueFName = Def#'ObjectSet'.uniquefname,
    Set = Def#'ObjectSet'.set,
    emit({nl,nl,nl,"%%================================"}),
    emit({nl,"%%  ",ObjSetName}),
    emit({nl,"%%================================",nl}),
    case ClassName of
	{_Module,ExtClassName} ->
	    gen_objset_code(Erules,ObjSetName,UniqueFName,Set,
			    ExtClassName,ClassDef);
	_ ->
	    gen_objset_code(Erules,ObjSetName,UniqueFName,Set,
			    ClassName,ClassDef)
    end,
    emit(nl).

gen_objset_code(Erules,ObjSetName,UniqueFName,Set,ClassName,ClassDef)->
    ClassFields = (ClassDef#classdef.typespec)#objectclass.fields,
    InternalFuncs=
	gen_objset_enc(Erules,ObjSetName,UniqueFName,Set,ClassName,ClassFields,1,[]),
    gen_objset_dec(ObjSetName,UniqueFName,Set,ClassName,ClassFields,1),
    gen_internal_funcs(Erules,InternalFuncs).

%% gen_objset_enc iterates over the objects of the object set
gen_objset_enc(_,_,{unique,undefined},_,_,_,_,_) ->
    %% There is no unique field in the class of this object set
    %% don't bother about the constraint
    [];
gen_objset_enc(Erule,ObjSName,UniqueName,[{ObjName,Val,Fields},T|Rest],
	       ClName,ClFields,NthObj,Acc)->
    emit({"'getenc_",ObjSName,"'(",{asis,UniqueName},",",{asis,Val},
	  ") ->",nl}),
    CurrMod = get(currmod),
    {InternalFunc,NewNthObj}=
	case ObjName of
	    {no_mod,no_name} ->
		gen_inlined_enc_funs(Erule,Fields,ClFields,ObjSName,NthObj);
	    {CurrMod,Name} ->
		emit({"    fun 'enc_",Name,"'/3"}),
		{[],0};
	    {ModName,Name} ->
		emit_ext_encfun(ModName,Name),
%		emit(["    {'",ModName,"', 'enc_",Name,"'}"]),
		{[],0};
	    _Other ->
		emit({"    fun 'enc_",ObjName,"'/3"}),
		{[],0}
	end,
    emit({";",nl}),
    gen_objset_enc(Erule,ObjSName,UniqueName,[T|Rest],ClName,ClFields,
		   NewNthObj,InternalFunc ++ Acc);
gen_objset_enc(Erule,ObjSetName,UniqueName,
	       [{ObjName,Val,Fields}],_ClName,ClFields,NthObj,Acc) ->

    emit({"'getenc_",ObjSetName,"'(",{asis,UniqueName},",",
	  {asis,Val},") ->",nl}),
    CurrMod = get(currmod),
    {InternalFunc,_}=
	case ObjName of
	    {no_mod,no_name} ->
		gen_inlined_enc_funs(Erule,Fields,ClFields,ObjSetName,NthObj);
	    {CurrMod,Name} ->
		emit({"    fun 'enc_",Name,"'/3"}),
		{[],NthObj};
	    {ModName,Name} ->
		emit_ext_encfun(ModName,Name),
%		emit(["    {'",ModName,"', 'enc_",Name,"'}"]),
		{[],NthObj};
	    _Other ->
		emit({"    fun 'enc_",ObjName,"'/3"}),
		{[],NthObj}
	end,
    emit([";",nl]),
    emit_default_getenc(ObjSetName,UniqueName),
    emit({".",nl,nl}),
    InternalFunc++Acc;
gen_objset_enc(Erule,ObjSetName,_UniqueName,['EXTENSIONMARK'],_ClName,
	       _ClFields,_NthObj,Acc) ->
    emit({"'getenc_",ObjSetName,"'(_, _) ->",nl}),
    emit({indent(3),"fun(_, Val, _) ->",nl}),
    case Erule of
	uper_bin ->
	    emit([indent(6),"Val",nl]);
	_ ->
	    emit([indent(6),"[{octets,Val}]",nl])
    end,
    emit({indent(3),"end.",nl,nl}),
    Acc;
gen_objset_enc(_,_,_,[],_,_,_,Acc) ->
    Acc.

emit_ext_encfun(ModuleName,Name) ->
    emit([indent(4),"fun(T,V,O) -> '",ModuleName,"':'enc_",
	  Name,"'(T,V,O) end"]).

emit_default_getenc(ObjSetName,UniqueName) ->
    emit(["'getenc_",ObjSetName,"'(",{asis,UniqueName},", ErrV) ->",nl]),
    emit([indent(4),"fun(C,V,_) -> exit({'Type not compatible with table constraint',{component,C},{value,V},{unique_name_and_value,",{asis,UniqueName},",ErrV}}) end"]).


%% gen_inlined_enc_funs for each object iterates over all fields of a
%% class, and for each typefield it checks if the object has that
%% field and emits the proper code.
gen_inlined_enc_funs(Erule,Fields,[{typefield,Name,_}|Rest],ObjSetName,NthObj) ->
    CurrMod = get(currmod),
    InternalDefFunName = asn1ct_gen:list2name([NthObj,Name,ObjSetName]),
    case lists:keysearch(Name,1,Fields) of
	{value,{_,Type}} when is_record(Type,type) ->
	    emit({indent(3),"fun(Type, Val, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    {Ret,N}=emit_inner_of_fun(Type,InternalDefFunName),
	    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj+N,Ret);
	{value,{_,Type}} when is_record(Type,typedef) ->
	    emit({indent(3),"fun(Type, Val, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    {Ret,N} = emit_inner_of_fun(Type,InternalDefFunName),
	    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj+N,Ret);
	{value,{_,#'Externaltypereference'{module=CurrMod,type=T}}} ->
	    emit({indent(3),"fun(Type, Val, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    emit([indent(12),"'enc_",T,"'(Val)"]),
%	    {Ret,N} = emit_inner_of_fun(TDef,InternalDefFunName),
	    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj,[]);
	{value,{_,#'Externaltypereference'{module=M,type=T}}} ->
	    emit({indent(3),"fun(Type, Val, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    emit([indent(12),"'",M,"'",":'enc_",T,"'(Val)"]),
	    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj,[]);
	false when Erule == uper_bin ->
	    emit([indent(3),"fun(Type,Val,_) ->",nl,
		  indent(6),"case Type of",nl,
		  indent(9),{asis,Name}," -> Val",nl]),
	    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj,[]);
	false ->
	    emit([indent(3),"fun(Type,Val,_) ->",nl,
		  indent(6),"case Type of",nl,
		  indent(9),{asis,Name}," -> [{octets,Val}]",nl]),
	    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj,[])
    end;
gen_inlined_enc_funs(Erule,Fields,[_H|Rest],ObjSetName,NthObj) ->
    gen_inlined_enc_funs(Erule,Fields,Rest,ObjSetName,NthObj);
gen_inlined_enc_funs(_,_,[],_,NthObj) ->
    {[],NthObj}.

gen_inlined_enc_funs1(Erule,Fields,[{typefield,Name,_}|Rest],ObjSetName,
		     NthObj,Acc) ->
    CurrentMod = get(currmod),
    InternalDefFunName = asn1ct_gen:list2name([NthObj,Name,ObjSetName]),
    {Acc2,NAdd}=
	case lists:keysearch(Name,1,Fields) of
	    {value,{_,Type}} when is_record(Type,type) ->
		emit({";",nl}),
		{Ret,N}=emit_inner_of_fun(Type,InternalDefFunName),
		{Ret++Acc,N};
	    {value,{_,Type}} when is_record(Type,typedef) ->
		emit({";",nl,indent(9),{asis,Name}," ->",nl}),
		{Ret,N}=emit_inner_of_fun(Type,InternalDefFunName),
		{Ret++Acc,N};
	    {value,{_,#'Externaltypereference'{module=CurrentMod,type=T}}} ->
		emit({";",nl,indent(9),{asis,Name}," ->",nl}),
		emit([indent(12),"'enc_",T,"'(Val)"]),
		{Acc,0};
	    {value,{_,#'Externaltypereference'{module=M,type=T}}} ->
		emit({";",nl,indent(9),{asis,Name}," ->",nl}),
		emit([indent(12),"'",M,"'",":'enc_",T,"'(Val)"]),
		{Acc,0};
	    false when Erule == uper_bin ->
		emit([";",nl,
		      indent(9),{asis,Name}," -> ",nl,
		      "Val",nl]),
		{Acc,0};
	    false ->
		emit([";",nl,
		      indent(9),{asis,Name}," -> ",nl,
		      "[{octets,Val}]",nl]),
		{Acc,0}
	end,
    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj+NAdd,Acc2);
gen_inlined_enc_funs1(Erule,Fields,[_H|Rest],ObjSetName,NthObj,Acc)->
    gen_inlined_enc_funs1(Erule,Fields,Rest,ObjSetName,NthObj,Acc);
gen_inlined_enc_funs1(_,_,[],_,NthObj,Acc) ->
    emit({nl,indent(6),"end",nl}),
    emit({indent(3),"end"}),
    {Acc,NthObj}.

emit_inner_of_fun(TDef=#typedef{name={ExtMod,Name},typespec=Type},
		  InternalDefFunName) ->
    case {ExtMod,Name} of
	{primitive,bif} ->
	    emit(indent(12)),
	    gen_encode_prim(per,Type,dotag,"Val"),
	    {[],0};
	{constructed,bif} ->
	    emit([indent(12),"'enc_",
		  InternalDefFunName,"'(Val)"]),
	    {[TDef#typedef{name=InternalDefFunName}],1};
	_ ->
	    emit({indent(12),"'",ExtMod,"':'enc_",Name,"'(Val)"}),
	    {[],0}
    end;
emit_inner_of_fun(#typedef{name=Name},_) ->
    emit({indent(12),"'enc_",Name,"'(Val)"}),
    {[],0};
emit_inner_of_fun(Type,_) when is_record(Type,type) ->
    CurrMod = get(currmod),
    case Type#type.def of
	Def when is_atom(Def) ->
	    emit({indent(9),Def," ->",nl,indent(12)}),
	    gen_encode_prim(erules,Type,dotag,"Val");
	TRef when is_record(TRef,typereference) ->
	    T = TRef#typereference.val,
	    emit({indent(9),T," ->",nl,indent(12),"'enc_",T,"'(Val)"});
	#'Externaltypereference'{module=CurrMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),"'enc_",T,"'(Val)"});
	#'Externaltypereference'{module=ExtMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),ExtMod,":'enc_",
		  T,"'(Val)"})
    end,
    {[],0}.

indent(N) ->
    lists:duplicate(N,32). % 32 = space


gen_objset_dec(_,{unique,undefined},_,_,_,_) ->
    %% There is no unique field in the class of this object set
    %% don't bother about the constraint
    ok;
gen_objset_dec(ObjSName,UniqueName,[{ObjName,Val,Fields},T|Rest],ClName,
	       ClFields,NthObj)->

    emit({"'getdec_",ObjSName,"'(",{asis,UniqueName},",",{asis,Val},
	  ") ->",nl}),
    CurrMod = get(currmod),
    NewNthObj=
	case ObjName of
	    {no_mod,no_name} ->
		gen_inlined_dec_funs(Fields,ClFields,ObjSName,NthObj);
	    {CurrMod,Name} ->
		emit(["    fun 'dec_",Name,"'/4"]),
		NthObj;
	    {ModName,Name} ->
		emit_ext_decfun(ModName,Name),
%		emit(["    {'",ModName,"', 'dec_",Name,"'}"]),
		NthObj;
	    _Other ->
		emit({"    fun 'dec_",ObjName,"'/4"}),
		NthObj
    end,
    emit({";",nl}),
    gen_objset_dec(ObjSName,UniqueName,[T|Rest],ClName,ClFields,NewNthObj);
gen_objset_dec(ObjSetName,UniqueName,[{ObjName,Val,Fields}],_ClName,
	       ClFields,NthObj) ->

    emit({"'getdec_",ObjSetName,"'(",{asis,UniqueName},",",{asis,Val},
	  ") ->",nl}),
    CurrMod=get(currmod),
    case ObjName of
	{no_mod,no_name} ->
	    gen_inlined_dec_funs(Fields,ClFields,ObjSetName,NthObj);
	{CurrMod,Name} ->
	    emit(["    fun 'dec_",Name,"'/4"]);
	{ModName,Name} ->
	    emit_ext_decfun(ModName,Name);
%	    emit(["    {'",ModName,"', 'dec_",Name,"'}"]);
	_Other ->
	    emit({"    fun 'dec_",ObjName,"'/4"})
    end,
    emit([";",nl]),
    emit_default_getdec(ObjSetName,UniqueName),
    emit({".",nl,nl}),
    ok;
gen_objset_dec(ObjSetName,_UniqueName,['EXTENSIONMARK'],_ClName,_ClFields,
	      _NthObj) ->
    emit({"'getdec_",ObjSetName,"'(_, _) ->",nl}),
    emit({indent(3),"fun(Attr1, Bytes, _,_) ->",nl}),
%%    emit({indent(6),"?RT_PER:decode_open_type(Bytes,[])",nl}),
    emit({indent(6),"{Bytes,Attr1}",nl}),
    emit({indent(3),"end.",nl,nl}),
    ok;
gen_objset_dec(_,_,[],_,_,_) ->
    ok.

emit_ext_decfun(ModuleName,Name) ->
    emit([indent(3),"fun(T,V,O1,O2) -> '",ModuleName,"':'dec_",
	  Name,"'(T,V,O1,O2) end"]).

emit_default_getdec(ObjSetName,UniqueName) ->
    emit(["'getdec_",ObjSetName,"'(",{asis,UniqueName},", ErrV) ->",nl]),
    emit([indent(2), "fun(C,V,_,_) -> exit({{component,C},{value,V},{unique_name_and_value,",{asis,UniqueName},",ErrV}}) end"]).


gen_inlined_dec_funs(Fields,[{typefield,Name,_}|Rest],
		    ObjSetName,NthObj) ->
    CurrMod = get(currmod),
    InternalDefFunName = [NthObj,Name,ObjSetName],
    case lists:keysearch(Name,1,Fields) of
	{value,{_,Type}} when is_record(Type,type) ->
	    emit({indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    N=emit_inner_of_decfun(Type,InternalDefFunName),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj+N);
	{value,{_,Type}} when is_record(Type,typedef) ->
	    emit({indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    N=emit_inner_of_decfun(Type,InternalDefFunName),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj+N);
	{value,{_,#'Externaltypereference'{module=CurrMod,type=T}}} ->
	    emit({indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    emit([indent(12),"'dec_",T,"'(Val, telltype)"]),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj);
	{value,{_,#'Externaltypereference'{module=M,type=T}}} ->
	    emit({indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    emit([indent(12),"'",M,"':'dec_",T,"'(Val, telltype)"]),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj);
	false ->
	    emit([indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl,
		  indent(9),{asis,Name}," ->{Val,Type}"]),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj)
    end;
gen_inlined_dec_funs(Fields,[_|Rest],ObjSetName,NthObj) ->
    gen_inlined_dec_funs(Fields,Rest,ObjSetName,NthObj);
gen_inlined_dec_funs(_,[],_,NthObj) ->
    NthObj.

gen_inlined_dec_funs1(Fields,[{typefield,Name,_}|Rest],
		      ObjSetName,NthObj) ->
    CurrentMod = get(currmod),
    InternalDefFunName = [NthObj,Name,ObjSetName],
    N=case lists:keysearch(Name,1,Fields) of
	  {value,{_,Type}} when is_record(Type,type) ->
	      emit({";",nl}),
	      emit_inner_of_decfun(Type,InternalDefFunName);
	  {value,{_,Type}} when is_record(Type,typedef) ->
	      emit({";",nl,indent(9),{asis,Name}," ->",nl}),
	      emit_inner_of_decfun(Type,InternalDefFunName);
	  {value,{_,#'Externaltypereference'{module=CurrentMod,type=T}}} ->
	      emit([";",nl,indent(9),{asis,Name}," ->",nl]),
	      emit([indent(12),"'dec_",T,"'(Val,telltype)"]),
	      0;
	  {value,{_,#'Externaltypereference'{module=M,type=T}}} ->
	      emit([";",nl,indent(9),{asis,Name}," ->",nl]),
	      emit([indent(12),"'",M,"'",":'dec_",T,"'(Val,telltype)"]),
	      0;
	  false ->
	      emit([";",nl,
		    indent(9),{asis,Name}," ->{Val,Type}"]),
	      0
      end,
    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj+N);
gen_inlined_dec_funs1(Fields,[_|Rest],ObjSetName,NthObj)->
    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj);
gen_inlined_dec_funs1(_,[],_,NthObj) ->
    emit({nl,indent(6),"end",nl}),
    emit({indent(3),"end"}),
    NthObj.

emit_inner_of_decfun(#typedef{name={ExtName,Name},typespec=Type},
		     InternalDefFunName) ->
    case {ExtName,Name} of
	{primitive,bif} ->
	    emit(indent(12)),
	    gen_dec_prim(per,Type,"Val"),
	    0;
	{constructed,bif} ->
	    emit({indent(12),"'dec_",
		  asn1ct_gen:list2name(InternalDefFunName),"'(Val)"}),
	    1;
	_ ->
	    emit({indent(12),"'",ExtName,"':'dec_",Name,"'(Val, telltype)"}),
	    0
    end;
emit_inner_of_decfun(#typedef{name=Name},_) ->
    emit({indent(12),"'dec_",Name,"'(Val, telltype)"}),
    0;
emit_inner_of_decfun(Type,_) when is_record(Type,type) ->
    CurrMod = get(currmod),
    case Type#type.def of
	Def when is_atom(Def) ->
	    emit({indent(9),Def," ->",nl,indent(12)}),
	    gen_dec_prim(erules,Type,"Val");
	TRef when is_record(TRef,typereference) ->
	    T = TRef#typereference.val,
	    emit({indent(9),T," ->",nl,indent(12),"'dec_",T,"'(Val)"});
	#'Externaltypereference'{module=CurrMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),"'dec_",T,"'(Val)"});
	#'Externaltypereference'{module=ExtMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),ExtMod,":'dec_",
		  T,"'(Val)"})
    end,
    0.


gen_internal_funcs(_,[]) ->
    ok;
gen_internal_funcs(Erules,[TypeDef|Rest]) ->
    gen_encode_user(Erules,TypeDef),
    emit([nl,nl,"'dec_",TypeDef#typedef.name,"'(Bytes) ->",nl]),
    gen_decode_user(Erules,TypeDef),
    gen_internal_funcs(Erules,Rest).



%% DECODING *****************************
%%***************************************


gen_decode(Erules,Type) when is_record(Type,typedef) ->
    D = Type,
    emit({nl,nl}),
    emit({"'dec_",Type#typedef.name,"'(Bytes,_) ->",nl}),
    dbdec(Type#typedef.name),
    gen_decode_user(Erules,D).

gen_decode(Erules,Tname,#'ComponentType'{name=Cname,typespec=Type}) ->
    NewTname = [Cname|Tname],
    gen_decode(Erules,NewTname,Type);

gen_decode(Erules,Typename,Type) when is_record(Type,type) ->
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    case asn1ct_gen:type(InnerType) of
	{constructed,bif} ->
	    ObjFun =
		case Type#type.tablecinf of
		    [{objfun,_}|_R] ->
			", ObjFun";
		    _ ->
			""
		end,
	    emit({nl,"'dec_",asn1ct_gen:list2name(Typename),
		  "'(Bytes,_",ObjFun,") ->",nl}),
	    dbdec(Typename),
	    asn1ct_gen:gen_decode_constructed(Erules,Typename,InnerType,Type);
	_ ->
	    true
    end.

dbdec(Type) when is_list(Type)->
    demit({"io:format(\"decoding: ",asn1ct_gen:list2name(Type),"~w~n\",[Bytes]),",nl});
dbdec(Type) ->
    demit({"io:format(\"decoding: ",{asis,Type},"~w~n\",[Bytes]),",nl}).

gen_decode_user(Erules,D) when is_record(D,typedef) ->
    CurrMod = get(currmod),
    Typename = [D#typedef.name],
    Def = D#typedef.typespec,
    InnerType = asn1ct_gen:get_inner(Def#type.def),
    case asn1ct_gen:type(InnerType) of
	{primitive,bif} ->
	    gen_dec_prim(Erules,Def,"Bytes"),
	    emit({".",nl,nl});
	'ASN1_OPEN_TYPE' ->
	    gen_dec_prim(Erules,Def#type{def='ASN1_OPEN_TYPE'},"Bytes"),
	    emit({".",nl,nl});
	{constructed,bif} ->
	    asn1ct_gen:gen_decode_constructed(Erules,Typename,InnerType,D);
	#typereference{val=Dname} ->
	    emit({"'dec_",Dname,"'(Bytes,telltype)"}),
	    emit({".",nl,nl});
	#'Externaltypereference'{module=CurrMod,type=Etype} ->
	    emit({"'dec_",Etype,"'(Bytes,telltype).",nl,nl});
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit({"'",Emod,"':'dec_",Etype,"'(Bytes,telltype).",nl,nl});
	Other ->
	    exit({error,{asn1,{unknown,Other}}})
    end.


gen_dec_prim(Erules,Att,BytesVar) ->
    Typename = Att#type.def,
    Constraint = Att#type.constraint,
    case Typename of
	'INTEGER' ->
	    emit({"?RT_PER:decode_integer(",BytesVar,",",
		  {asis,effective_constraint(integer,Constraint)},")"});
	{'INTEGER',NamedNumberList} ->
	    emit({"?RT_PER:decode_integer(",BytesVar,",",
		  {asis,effective_constraint(integer,Constraint)},",",
		  {asis,NamedNumberList},")"});

	'REAL' ->
	    emit({"?RT_PER:decode_real(",BytesVar,")"});
	
	{'BIT STRING',NamedNumberList} ->
	    case get(compact_bit_string) of
		true ->
		    emit({"?RT_PER:decode_compact_bit_string(",
			  BytesVar,",",{asis,Constraint},",",
			  {asis,NamedNumberList},")"});
		_ ->
		    emit({"?RT_PER:decode_bit_string(",BytesVar,",",
			  {asis,Constraint},",",
			  {asis,NamedNumberList},")"})
	    end;
	'NULL' ->
	    emit({"?RT_PER:decode_null(",
		  BytesVar,")"});
	'OBJECT IDENTIFIER' ->
	    emit({"?RT_PER:decode_object_identifier(",
		  BytesVar,")"});
	'RELATIVE-OID' ->
	    emit({"?RT_PER:decode_relative_oid(",
		  BytesVar,")"});
	'ObjectDescriptor' ->
	    emit({"?RT_PER:decode_ObjectDescriptor(",
		  BytesVar,")"});
	{'ENUMERATED',{NamedNumberList1,NamedNumberList2}} ->
	    NewTup = {list_to_tuple([X||{X,_} <- NamedNumberList1]),
		      list_to_tuple([X||{X,_} <- NamedNumberList2])},
	    NewC = [{'ValueRange',{0,size(element(1,NewTup))-1}}],
	    emit({"?RT_PER:decode_enumerated(",BytesVar,",",
		  {asis,NewC},",",
		  {asis,NewTup},")"});
	{'ENUMERATED',NamedNumberList} ->
	    NewTup = list_to_tuple([X||{X,_} <- NamedNumberList]),
	    NewC = [{'ValueRange',{0,size(NewTup)-1}}],
	    emit({"?RT_PER:decode_enumerated(",BytesVar,",",
		  {asis,NewC},",",
		  {asis,NewTup},")"});
	'BOOLEAN'->
	    emit({"?RT_PER:decode_boolean(",BytesVar,")"});
	'OCTET STRING' ->
	    emit({"?RT_PER:decode_octet_string(",BytesVar,",",
		  {asis,Constraint},")"});
	'NumericString' ->
	    emit({"?RT_PER:decode_NumericString(",BytesVar,",",
		  {asis,Constraint},")"});
	TString when TString == 'TeletexString';
		     TString == 'T61String' ->
	    emit({"?RT_PER:decode_TeletexString(",BytesVar,",",
		  {asis,Constraint},")"});
	'VideotexString' ->
	    emit({"?RT_PER:decode_VideotexString(",BytesVar,",",
		  {asis,Constraint},")"});
	'UTCTime' ->
	    emit({"?RT_PER:decode_VisibleString(",BytesVar,",",
		  {asis,Constraint},")"});
	'GeneralizedTime' ->
	    emit({"?RT_PER:decode_VisibleString(",BytesVar,",",
		  {asis,Constraint},")"});
	'GraphicString' ->
	    emit({"?RT_PER:decode_GraphicString(",BytesVar,",",
		  {asis,Constraint},")"});
	'VisibleString' ->
	    emit({"?RT_PER:decode_VisibleString(",BytesVar,",",
		  {asis,Constraint},")"});
	'GeneralString' ->
	    emit({"?RT_PER:decode_GeneralString(",BytesVar,",",
		  {asis,Constraint},")"});
	'PrintableString' ->
	    emit({"?RT_PER:decode_PrintableString(",BytesVar,",",{asis,Constraint},")"});
	'IA5String' ->
	    emit({"?RT_PER:decode_IA5String(",BytesVar,",",{asis,Constraint},")"});
	'BMPString' ->
	    emit({"?RT_PER:decode_BMPString(",BytesVar,",",
		  {asis,Constraint},")"});
	'UniversalString' ->
	    emit({"?RT_PER:decode_UniversalString(",BytesVar,
		  ",",{asis,Constraint},")"});
	'UTF8String' ->
	    emit({"?RT_PER:decode_UTF8String(",BytesVar,")"});
	'ANY' ->
	    case Erules of
		per ->
		    emit(["fun() -> {XTerm,YTermXBytes} = ?RT_PER:decode_open_type(",BytesVar,",",{asis,Constraint}, "), {binary_to_list(XTerm),XBytes} end ()"]);
		_ ->
		    emit(["?RT_PER:decode_open_type(",BytesVar,",", 
			  {asis,Constraint}, ")"])
	    end;
	'ASN1_OPEN_TYPE' ->
	    case Constraint of
		[#'Externaltypereference'{type=Tname}] ->
		    emit(["fun(FBytes) ->",nl,
			  "   {XTerm,XBytes} = "]),
		    emit(["?RT_PER:decode_open_type(FBytes,[]),",nl]),
		    emit(["   {YTerm,_} = dec_",Tname,"(XTerm,mandatory),",nl]),
		    emit(["   {YTerm,XBytes} end(",BytesVar,")"]);
		[#type{def=#'Externaltypereference'{type=Tname}}] ->
		    emit(["fun(FBytes) ->",nl,
			  "   {XTerm,XBytes} = "]),
		    emit(["?RT_PER:decode_open_type(FBytes,[]),",nl]),
		    emit(["   {YTerm,_} = dec_",Tname,"(XTerm,mandatory),",nl]),
		    emit(["   {YTerm,XBytes} end(",BytesVar,")"]);
		_ ->
		    case Erules of
			per ->
			    emit(["fun() -> {XTerm,XBytes} = ?RT_PER:decode_open_type(",BytesVar,", []), {binary_to_list(XTerm),XBytes} end()"]);
			_ ->
			    emit(["?RT_PER:decode_open_type(",BytesVar,",[])"])
		    end
	    end;
	#'ObjectClassFieldType'{} ->
		case asn1ct_gen:get_inner(Att#type.def) of
		    {fixedtypevaluefield,_,InnerType} -> 
			gen_dec_prim(Erules,InnerType,BytesVar);
		    T ->
			gen_dec_prim(Erules,Att#type{def=T},BytesVar)
		end;
	Other ->
	    exit({'cant decode' ,Other})
    end.


is_already_generated(Operation,Name) ->
    case get(class_default_type) of
	undefined ->
	    put(class_default_type,[{Operation,Name}]),
	    false;
	GeneratedList ->
	    case lists:member({Operation,Name},GeneratedList) of
		true ->
		    true;
		false ->
		    put(class_default_type,[{Operation,Name}|GeneratedList]),
		    false
	    end
    end.

get_class_fields(#classdef{typespec=ObjClass}) ->
    ObjClass#objectclass.fields;
get_class_fields(#objectclass{fields=Fields}) ->
    Fields;
get_class_fields(_) ->
    [].


get_object_field(Name,ObjectFields) ->
    case lists:keysearch(Name,1,ObjectFields) of
	{value,Field} -> Field;
	false -> false
    end.


%% For PER the ExtensionAdditionGroup notation has significance for the encoding and decoding
%% the components within the ExtensionAdditionGroup is treated in a similar way as if they
%% have been specified within a SEQUENCE, therefore we construct a fake sequence type here
%% so that we can generate code for it
extaddgroup2sequence(ExtList) ->
    extaddgroup2sequence(ExtList,0,[]).

extaddgroup2sequence([{'ExtensionAdditionGroup',Number0}|T],ExtNum,Acc) ->
    Number = case Number0 of undefined -> 1; _ -> Number0 end,
    {ExtGroupComps,['ExtensionAdditionGroupEnd'|T2]} =
     lists:splitwith(fun(Elem) -> is_record(Elem,'ComponentType') end,T),
    extaddgroup2sequence(T2,ExtNum+1,
			 [#'ComponentType'{
			     name=list_to_atom("ExtAddGroup"++
						   integer_to_list(ExtNum+1)),
			     typespec=#type{def=#'SEQUENCE'{
					      extaddgroup=Number,
					      components=ExtGroupComps}},
			     prop='OPTIONAL'}|Acc]);
extaddgroup2sequence([C|T],ExtNum,Acc) ->
    extaddgroup2sequence(T,ExtNum,[C|Acc]);
extaddgroup2sequence([],_,Acc) ->
    lists:reverse(Acc).
