//- ****************************************************************************
//-
//- Copyright 2009 National Technology & Engineering Solutions of Sandia, LLC
//- (NTESS). Under the terms of Contract DE-NA0003525 with NTESS, the U.S.
//- Government retains certain rights in this software.
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//- BSD Open Source License
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//-      this list of conditions and the following disclaimer.
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//-   2. Redistributions in binary form must reproduce the above copyright
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#include "CrustalProfileStore.h"
#include "SLBMGlobals.h"
#include "SLBMException.h"

// **** _BEGIN SLBM NAMESPACE_ **************************************************

namespace slbm {

// **** _FUNCTION DESCRIPTION_ *************************************************
//
// Parameterized CrustalProfileStore Constructor
//
// *****************************************************************************
CrustalProfileStore::CrustalProfileStore(Grid& _grid, const int& _maxSize)
: grid(_grid),
  maxSize(_maxSize),
  locString("12345678901234567890123456789012")
{
}  // END CrustalProfileStore Default Constructor


// **** _FUNCTION DESCRIPTION_ *************************************************
//
// CrustalProfileStore Destructor
//
// *****************************************************************************
CrustalProfileStore::~CrustalProfileStore()
{
    clear();
}  

void CrustalProfileStore::clear()
{
    for (map<string, CrustalProfile*>::iterator it = profiles.begin();
        it != profiles.end(); ++it)
            //pool.push_back(it->second);
            delete it->second;

    profiles.clear();
    priority.clear();

    while (!pool.empty())
    {
        delete pool.front();
        pool.pop_front();
    }
}

CrustalProfile* CrustalProfileStore::getCrustalProfile(const int& phase, 
        const double& lat, const double& lon, const double& depth)
{
    CrustalProfile* profile = NULL;

    // create a string out of the phase, lat,lon,depth information 
    *((int*)    &locString[0])  = phase;
    *((double*) &locString[8])  = lat;
    *((double*) &locString[16]) = lon;
    *((double*) &locString[24]) = depth;

    // see if CrustalProfileStore already knows about a crustal profile at this 
    // phase/location.
    map<string, CrustalProfile*>::iterator it = profiles.find(locString);

    if (it == profiles.end())
    {
        // do not have a reference to a profile that matches this description.
        // Have to create one.

        // see if the priority list is max size
        if ((int)priority.size() >= maxSize)
        {
            // priority list is maxSize so it can't grow anymore.
            // Remove the lowest priority CrustalProfile object.

            // get the string at back of list (lowest priority)
            string oldString = priority.back();

            // find iterator to oldString->crustalProfile pair
            it = profiles.find(oldString);

            // return the CrustalProfile object to pool of unused profiles.
            pool.push_back(it->second);

            // remove the oldString->crustalProfile pair from the map
            profiles.erase(it);

            // pop last element off priority list
            priority.pop_back();
        }
        
        // get a new crustal profile object at this phase/location.
        if (pool.size() > 0)
        {
            profile = pool.front();
            pool.pop_front();
        }
        else
            profile = new CrustalProfile();

        profile->setup(grid, phase, lat, lon, depth);

        // add a map entry that relates this phase/location to the new
        // crustal profile.
        profiles[locString] = profile;

        // push the new locString onto the front of the priority list
        priority.push_front(locString);
    }
    else
    {
        // there is already a crustal profile defined at this phase/location.
        // return a pointer to the existing crustal profile object.
        profile = it->second;

        // find locString in the priority list, remove it from the list,
        // and add it to the front of the list.
        if (locString != priority.front())
        {
            list<string>::iterator lit = priority.begin();
            while (*lit != locString) ++lit;
            priority.erase(lit);
            priority.push_front(locString);
        }
    }
    
    return profile;
}

} // end slbm namespace
