#include "deptree.h"

int DepTree::CreateNodeFromVar(const std::string& var, UsedType& used, CallStack& callstack)
{
 COUT(DEBUG)<<"DepTree::CreateNodeFromVar "<<var<<std::endl;
 if(G_vars.count(var)==0)
 {
  COUT(ERROR)<<"Definition of variable "<<var<<" not found"<<std::endl;
  return 1;
 }

 UsedType ids;

 used.insert(var);
 G_vars[var]->UsedIdents(ids);
 type=DepTree::VAR;
 name=var;

 DepTree* d;
 int ret;
 callstack.insert(this);
 for(auto& i:ids)
 {
  d=FindNodeByVar(i);
  if(d==0)
  {
   auto n=*childrens.insert(new DepTree).first;
   n->parents.insert(this);
   ret=n->CreateNodeFromVar(i,used,callstack);
   if(ret!=0)
   {
    COUT(ERROR)<<" in definition of variable "<<name<<std::endl;
    return ret;
   }
  }
  else
  {
   if(callstack.find(d)!=callstack.end())
   {
    COUT(ERROR)<<"Circular dependency of variable "<<name<<" from variable "<<i<<std::endl;
    return 1;
   }
   childrens.insert(d);
   d->parents.insert(this);
  }
 }
 callstack.erase(this);

 return 0;
}


int DepTree::CreateNodeFromSP(DepTree::NodeType list, G_toType::size_type ind, UsedType& used)
{
 if(list!=DepTree::SAVE && list!=DepTree::PRINT)
 {
  COUT(ERROR)<<"Internal error, incorrect NodeType in DepTree::CreateNodeFromSP()."<<std::endl;
  return 2;
 }
 COUT(DEBUG)<<"DepTree::CreateNodeFromSP "<<((list==DepTree::SAVE)?G_tosave:G_toprint)[ind]->Dump()<<std::endl;

 std::set<std::string> ids;
 CallStack callstack;

 type=list;
 index=ind;

 if(type==DepTree::SAVE) G_tosave[index]->UsedIdents(ids);
 else if(type==DepTree::PRINT) G_toprint[index]->UsedIdents(ids);
 DepTree* d;
 int ret;
 for(auto& i:ids)
 {
  d=FindNodeByVar(i);
  if(d==0)
  {
   auto n=*childrens.insert(new DepTree).first;
   n->parents.insert(this);
   ret=n->CreateNodeFromVar(i,used,callstack);
   if(ret!=0)
   {
    COUT(ERROR)<<" in "<<((type==DepTree::SAVE)?"save":"print")<<" directive "<<((type==DepTree::SAVE)?G_tosave:G_toprint)[index]->Dump()<<"."<<std::endl;
    return ret;
   }
  }
  else
  {
   childrens.insert(d);
   d->parents.insert(this);
  }
 }

 return 0;
}


int DepTree::CreateGlobalTree(UsedType& used)
{
 if(parents.size()!=0)
 {
  COUT(ERROR)<<"Internal error, DepTree::CreateGlobalTree() call for non-root node."<<std::endl;
  return 2;
 }

 type=DepTree::ROOT;
 for(int i=0; i<G_tosave.size(); i++)
 {
  auto n=*childrens.insert(new DepTree).first;
  n->parents.insert(this);
  auto ret=n->CreateNodeFromSP(DepTree::SAVE,i,used);
  if(ret!=0) return ret;
 }
 for(int i=0; i<G_toprint.size(); i++)
 {
  auto n=*childrens.insert(new DepTree).first;
  n->parents.insert(this);
  auto ret=n->CreateNodeFromSP(DepTree::PRINT,i,used);
  if(ret!=0) return ret;
 }

 return 0;
}


DepTree* DepTree::FindNodeByVarFromCurrent(const std::string& var) const
{
 if(type==DepTree::VAR && name==var) return const_cast<DepTree*>(this);

 DepTree* d;
 for(auto& i:childrens)
 {
  d=i->FindNodeByVarFromCurrent(var);
  if(d!=0) return d;
 }
 return 0;
}


DepTree* DepTree::FindNodeByVar(const std::string& var) const
{
 const DepTree* curnode=this;
 while(curnode->parents.size()!=0) curnode=*(curnode->parents.begin());
 return curnode->FindNodeByVarFromCurrent(var);
}