/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*
 Copyright (C) 2006 Giorgio Facchinetti

 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/

 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at
 <https://www.quantlib.org/license.shtml>.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the license for more details.
*/

#include <ql/models/shortrate/onefactormodels/hullwhite.hpp>
#include <ql/quotes/futuresconvadjustmentquote.hpp>
#include <ql/time/imm.hpp>
#include <utility>

namespace QuantLib {

    FuturesConvAdjustmentQuote::FuturesConvAdjustmentQuote(const ext::shared_ptr<IborIndex>& index,
                                                           const Date& futuresDate,
                                                           Handle<Quote> futuresQuote,
                                                           Handle<Quote> volatility,
                                                           Handle<Quote> meanReversion)
    : dc_(index->dayCounter()), futuresDate_(futuresDate),
      indexMaturityDate_(index->maturityDate(futuresDate_)), futuresQuote_(std::move(futuresQuote)),
      volatility_(std::move(volatility)), meanReversion_(std::move(meanReversion)) {

        registerWith(futuresQuote_);
        registerWith(volatility_);
        registerWith(meanReversion_);
        registerWith(Settings::instance().evaluationDate());
    }

    FuturesConvAdjustmentQuote::FuturesConvAdjustmentQuote(const ext::shared_ptr<IborIndex>& index,
                                                           const std::string& immCode,
                                                           Handle<Quote> futuresQuote,
                                                           Handle<Quote> volatility,
                                                           Handle<Quote> meanReversion)
    : FuturesConvAdjustmentQuote(index, IMM::date(immCode), std::move(futuresQuote),
                                 std::move(volatility), std::move(meanReversion)) {}

    Real FuturesConvAdjustmentQuote::value() const {
        if (rate_ == Null<Real>()) {
            Date settlementDate = Settings::instance().evaluationDate();
            Time startTime = dc_.yearFraction(settlementDate, futuresDate_);
            Time indexMaturity = dc_.yearFraction(settlementDate,
                                                  indexMaturityDate_);
            rate_ = HullWhite::convexityBias(futuresQuote_->value(),
                                             startTime,
                                             indexMaturity,
                                             volatility_->value(),
                                             meanReversion_->value());
        }
        return rate_;
    }

    bool FuturesConvAdjustmentQuote::isValid() const {
        return !futuresQuote_.empty() && !volatility_.empty() &&
               !meanReversion_.empty() && futuresQuote_->isValid() &&
               volatility_->isValid() && meanReversion_->isValid();
    }
}
