/*
 * (C) Copyright 1996-2016 ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 * In applying this licence, ECMWF does not waive the privileges and immunities
 * granted to it by virtue of its status as an intergovernmental organisation nor
 * does it submit to any jurisdiction.
 */

/*! \file HeightSelection.cc
    \brief Implementation of the Template class HeightSelection.

    Magics Team - ECMWF 2004

    Started: Thu 20-May-2004

    Changes:

*/


#include "HeightTechnique.h"
#include "LevelSelection.h"

using namespace magics;

HeightTechnique::HeightTechnique() {}


HeightTechnique::~HeightTechnique() {}

/*!
 Class information are given to the output-stream.
*/
void HeightTechnique::print(ostream& out) const {
    out << "HeightTechnique[";
    out << "]";
}

void HeightTechnique::set(const HeightTechniqueInterface&) {}


ListHeightTechnique::ListHeightTechnique() {}


ListHeightTechnique::~ListHeightTechnique() {}

void ListHeightTechnique::set(const HeightTechniqueInterface& interface) {
    list_   = interface.getHeights();
    policy_ = interface.getHeightPolicy();
}

void ListHeightTechnique::prepare(LevelSelection& levels) {
    heights_.clear();
    if (list_.empty())
        list_.push_back(0.2);
    if (levels.size() == 1) {
        heights_[Interval(levels.front(), levels.front())] = list_.front();
        return;
    }

    LevelSelection::const_iterator level  = levels.begin();
    vector<double>::const_iterator height = list_.begin();
    while (true) {
        heights_[Interval(*level, *(level + 1))] = *height;
        height++;
        level++;
        if (level == levels.end())
            break;
        if (height == list_.end()) {
            if (policy_ != ListPolicy::LASTONE)
                height = list_.begin();
            else
                --height;
        }
    }
}

CalculateHeightTechnique::CalculateHeightTechnique() {}


CalculateHeightTechnique::~CalculateHeightTechnique() {}

void CalculateHeightTechnique::set(const HeightTechniqueInterface& interface) {
    min_ = interface.getMinHeight();
    max_ = interface.getMaxHeight();
}

void CalculateHeightTechnique::prepare(LevelSelection& levels) {
    ASSERT(levels.size() > 1);
    heights_.clear();
    double step                          = (levels.size() == 2) ? (max_ - min_) : (max_ - min_) / (levels.size() - 2);
    LevelSelection::const_iterator level = levels.begin();
    double height                        = min_;

    while (true) {
        MagLog::debug() << "[" << *level << ", " << *(level + 1) << "]=" << height << "(height)" << endl;
        heights_[Interval(*level, *(level + 1))] = height;
        height += step;
        level++;
        if (level == levels.end())
            break;
    }
}
