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

 Copyright (C) 2007 Chris Kenyon

 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

 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.

/*! \file yearonyearinflationswap.hpp
    \brief Year-on-year inflation-indexed swap

#ifndef quantlib_yyiis_hpp
#define quantlib_yyiis_hpp

#include <ql/instruments/inflationswap.hpp>

namespace QuantLib {

    //! Year-on-year inflation-indexed swap
    /*! Quoted as a fixed rate \f$ K \f$.  At start:
        \sum_{i=1}^{M} P_n(0,t_i) N K =
        \sum_{i=1}^{M} P_n(0,t_i) N \left[ \frac{I(t_i)}{I(t_i-1)} - 1 \right]
        where \f$ t_M \f$ is the maturity time, \f$ P_n(0,t) \f$ is the
        nominal discount factor at time \f$ t \f$, \f$ N \f$ is the
        notional, and \f$ I(t) \f$ is the inflation index value at
        time \f$ t \f$.

        \note The allowAmbiguousPayments parameter is to allow for
              payment arithmetic being ambiguous.  If the maturity is
              in, say, 30.01 years according to the day-counter and
              roll rules, does this mean that there is a payment in
              0.01 years? If allowAmbiguousPayments is false, the
              ambiguousPaymentPeriod parameter sets the period within
              which the answer is no.
00050     class YearOnYearInflationSwap : public InflationSwap {
                   const Date& start,
                   const Date& maturity,
                   const Period& lag,
                   Rate fixedRate,
                   const Calendar& calendar,
                   BusinessDayConvention convention,
                   const DayCounter& dayCounter,
                   const Handle<YieldTermStructure>& yieldTS,
                   const Handle<YoYInflationTermStructure>& inflationTS,
                   bool allowAmbiguousPayments = false,
                   const Period& ambiguousPaymentPeriod = Period(1, Months));

        //! \name Instrument interface
        bool isExpired() const;

        //! \name InflationSwap interface
        //! the rate \f$ \tilde{K} \f$ such that NPV = 0.
        Rate fairRate() const;

        //! \name Inspectors
        //! \f$ K \f$ in the above formula.
        Rate fixedRate() const;
        std::vector<Date> paymentDates() const;

        //! \name Instrument interface
        void setupExpired() const;
        void performCalculations() const;

        Rate fixedRate_;
        Handle<YoYInflationTermStructure> inflationTS_;

        bool allowAmbiguousPayments_;
        Period ambiguousPaymentPeriod_;
        std::vector<Date> paymentDates_;

        mutable Rate fairRate_;



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