/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 *
 * Custom CPAP/Oximetry Calculations Header
 *
 * Copyright (c) 2011-2014 Mark Watkins <jedimark@users.sourceforge.net>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file COPYING in the main directory of the Linux
 * distribution for more details. */

#ifndef CALCS_H
#define CALCS_H

#include "day.h"

//! param samples Number of samples
//! width number of surrounding samples to consider
//! percentile fractional percentage, between 0 and 1
void percentileFilter(EventDataType * input, EventDataType * output, int samples, int width, EventDataType percentile);
void xpassFilter(EventDataType * input, EventDataType * output, int samples, EventDataType weight);

enum FilterType { FilterNone=0, FilterPercentile, FilterXPass };

struct Filter {
    Filter(FilterType t,EventDataType p1,EventDataType p2,EventDataType p3) {
        type=t;
        param1=p1;
        param2=p2;
        param3=p3;
    }
    Filter() {
        type=FilterNone;
        param1=0;
        param2=0;
        param3=0;
    }
    Filter(const Filter & copy) {
        type=copy.type;
        param1=copy.param1;
        param2=copy.param2;
        param3=copy.param3;
    }

    FilterType type;
    EventDataType param1;
    EventDataType param2;
    EventDataType param3;
};

struct BreathPeak {
    BreathPeak() { min=0; max=0; start=0; middle=0; end=0; } // peakmin=0; peakmax=0;  }
    BreathPeak(EventDataType _min, EventDataType _max, qint32 _start, qint32 _middle,  qint32 _end) {//, qint64 _peakmin, qint64 _peakmax) {
        min=_min;
        max=_max;
        start=_start;
        middle=_middle;
        end=_end;
        //peakmax=_peakmax;
        //peakmin=_peakmin;
    }
    BreathPeak(const BreathPeak & copy) {
        min=copy.min;
        max=copy.max;
        start=copy.start;
        middle=copy.middle;
        end=copy.end;
        //peakmin=copy.peakmin;
        //peakmax=copy.peakmax;
    }
    int samplelength() { return end-start; }
    int upperLength() { return middle-start; }
    int lowerLength() { return end-middle; }

    EventDataType min;   // peak value
    EventDataType max;   // peak value
    qint32 start;       // beginning zero cross
    qint32 middle;         // ending zero cross
    qint32 end;         // ending zero cross
    //qint64 peakmin;     // min peak index
    //qint64 peakmax;     // max peak index
};

bool operator<(const BreathPeak & p1, const BreathPeak & p2);

const int num_filter_buffers=2;

const int max_filter_buf_size=2097152*sizeof(EventDataType);

//! \brief Class to process Flow Rate waveform data
class FlowParser {
public:
    FlowParser();
    ~FlowParser();

    //! \brief Clears the (input) filter chain
    void clearFilters();

    //! \brief Applies the filter chain to input, with supplied number of samples
    EventDataType * applyFilters(EventDataType * input, int samples);

    //! \brief Add the filter
    void addFilter(FilterType ft, EventDataType p1=0, EventDataType p2=0, EventDataType p3=0) {
        m_filters.push_back(Filter(ft,p1,p2,p3));
    }
    //! \brief Opens the flow rate EventList, applies the input filter chain, and calculates peaks
    void openFlow(Session * session, EventList * flow);

    //! \brief Calculates the upper and lower breath peaks
    void calcPeaks(EventDataType * input, int samples);

    // Minute vent needs Resp & TV calcs made here..
    void calc(bool calcResp, bool calcTv, bool calcTi, bool calcTe, bool calcMv);
    void flagEvents();

    /*void calcTidalVolume();
    void calcRespRate();
    void calcMinuteVent(); */


    QList<Filter> m_filters;
protected:
    QVector<BreathPeak> breaths;

    int m_samples;
    EventList * m_flow;
    Session * m_session;
    EventDataType m_gain;
    EventDataType m_rate;
    EventDataType m_minutes;
    //! \brief The filtered waveform
    EventDataType * m_filtered;
    //! \brief BreathPeak's start on positive cycle?
    bool m_startsUpper;
private:
    EventDataType * m_buffers[num_filter_buffers];
};

bool SearchApnea(Session *session, qint64 time, qint64 dist=15000);

//! \brief Calculate Respiratory Rate, Tidal Volume & Minute Ventilation for PRS1 data
void calcRespRate(Session *session, FlowParser * flowparser=NULL);

//! \brief Calculates the sliding window AHI graph
int calcAHIGraph(Session *session);

//! \brief Calculates AHI for a session between start & end (a support function for the sliding window graph)
EventDataType calcAHI(Session *session,qint64 start=-1, qint64 end=-1);

//! \brief Leaks calculations for PRS1
int calcLeaks(Session *session);

//! \brief Calculate Pulse change flagging, according to preferences
int calcPulseChange(Session *session);

//! \brief Calculate SPO2 Drop flagging, according to preferences
int calcSPO2Drop(Session *session);


#endif // CALCS_H