/**CFile****************************************************************

  FileName    [abcCollapse.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    [Collapsing the network into two-levels.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - June 20, 2005.]

  Revision    [$Id: abcCollapse.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]

***********************************************************************/

#include "abc.h"

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

static Abc_Ntk_t * Abc_NtkFromGlobalBdds( Abc_Ntk_t * pNtk );
static Abc_Obj_t * Abc_NodeFromGlobalBdds( Abc_Ntk_t * pNtkNew, DdManager * dd, DdNode * bFunc );

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFITIONS                           ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Collapses the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkCollapse( Abc_Ntk_t * pNtk, int fVerbose )
{
    int fCheck = 1;
    Abc_Ntk_t * pNtkNew;

    assert( Abc_NtkIsStrash(pNtk) );

    // compute the global BDDs
    if ( Abc_NtkGlobalBdds(pNtk, 0) == NULL )
        return NULL;
    if ( fVerbose )
        printf( "The shared BDD size is %d nodes.\n", Cudd_ReadKeys(pNtk->pManGlob) - Cudd_ReadDead(pNtk->pManGlob) );

    // create the new network
    pNtkNew = Abc_NtkFromGlobalBdds( pNtk );
    Abc_NtkFreeGlobalBdds( pNtk );
    if ( pNtkNew == NULL )
    {
        Cudd_Quit( pNtk->pManGlob );
        pNtk->pManGlob = NULL;
        return NULL;
    }
    Extra_StopManager( pNtk->pManGlob );
    pNtk->pManGlob = NULL;

    // make the network minimum base
    Abc_NtkMinimumBase( pNtkNew );

    // make sure that everything is okay
    if ( fCheck && !Abc_NtkCheck( pNtkNew ) )
    {
        printf( "Abc_NtkCollapse: The network check has failed.\n" );
        Abc_NtkDelete( pNtkNew );
        return NULL;
    }
    return pNtkNew;
}

/**Function*************************************************************

  Synopsis    [Derives the network with the given global BDD.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkFromGlobalBdds( Abc_Ntk_t * pNtk )
{
    ProgressBar * pProgress;
    Abc_Ntk_t * pNtkNew;
    Abc_Obj_t * pNode, * pNodeNew;
    DdManager * dd = pNtk->pManGlob;
    int i;
    // start the new network
    pNtkNew = Abc_NtkStartFrom( pNtk, ABC_TYPE_LOGIC, ABC_FUNC_BDD );
    // make sure the new manager has the same number of inputs
    Cudd_bddIthVar( pNtkNew->pManFunc, dd->size-1 );
    // process the POs
    pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) );
    Abc_NtkForEachCo( pNtk, pNode, i )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        pNodeNew = Abc_NodeFromGlobalBdds( pNtkNew, dd, Vec_PtrEntry(pNtk->vFuncsGlob, i) );
        Abc_ObjAddFanin( pNode->pCopy, pNodeNew );
    }
    Extra_ProgressBarStop( pProgress );
    return pNtkNew;
}

/**Function*************************************************************

  Synopsis    [Derives the network with the given global BDD.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Obj_t * Abc_NodeFromGlobalBdds( Abc_Ntk_t * pNtkNew, DdManager * dd, DdNode * bFunc )
{
    Abc_Obj_t * pNodeNew, * pTemp;
    int i;
    // create a new node
    pNodeNew = Abc_NtkCreateNode( pNtkNew );
    // add the fanins in the order, in which they appear in the reordered manager
    Abc_NtkForEachCi( pNtkNew, pTemp, i )
        Abc_ObjAddFanin( pNodeNew, Abc_NtkCi(pNtkNew, dd->invperm[i]) );
    // transfer the function
    pNodeNew->pData = Extra_TransferLevelByLevel( dd, pNtkNew->pManFunc, bFunc );  Cudd_Ref( pNodeNew->pData );
    return pNodeNew;
}


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///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////