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#ifndef CLIMATE_H

#define CLIMATE_H

#include <QtSql>

#include "phenology.h"

/// current climate variables of a day. @sa Climate.

struct ClimateDay

{

    int year; // year

    int month; // month

    int day; // day of year

    double temperature; // average day °C

    double temp_delayed; // temperature delayed (after Maekela, 2008) for response calculations

    double preciptitation; // sum of day [mm]

    double radiation; // sum of day (MJ/m2)

    double vpd; // average of day [kPa] = [0.1 mbar] (1 bar = 100kPa)

    static double co2; // ambient CO2 content in ppm

    QString toString() const { return QString("%1.%2.%3").arg(day).arg(month).arg(year); }

    bool isValid() const  { return (year>=0); }

    int id() const { return year*10000 + month*100 + day; }

};

/// Sun handles calculations of day lengths, etc.

class Sun

{

public:

    void setup(const double latitude_rad);

    QString dump();

    const double &daylength(const int day) const { return mDaylength_h[day]; }

    int longestDay() const { return mDayWithMaxLength; }

    bool northernHemishere() const { return mDayWithMaxLength<300; }

private:

    double mLatitude; ///< latitude in radians

    int mDayWithMaxLength; ///< day of year with maximum day length

    double mDaylength_h[366]; ///< daylength per day in hours

};

class Climate

{

public:

    Climate();

    void setup(); ///< setup routine that opens database connection

    // activity

    void nextYear();

    // access to climate data

    const ClimateDay *dayOfYear(const int dayofyear) const { return mBegin + dayofyear;} ///< get pointer to climate structure by day of year (0-based-index)

    const ClimateDay *day(const int month, const int day) const; ///< gets pointer to climate structure of given day (0-based indices, i.e. month=11=december!)

    /// returns two pointer (arguments!!!) to the begin and one after end of the given month (month: 0..11)

    void monthRange(const int month, const ClimateDay **rBegin, const ClimateDay **rEnd) const;

    double days(const int month) const; ///< returns number of days of given month

    int daysOfYear() const; ///< returns number of days of current year. points to the first day of the current year.

    const ClimateDay *begin() const { return mBegin; } ///< STL-like (pointer)-iterator to the day *after* last day of the current year

    const ClimateDay *end() const { return mEnd; } ///< STL-like pointer iterator

    void toDate(const int yearday, int *rDay=0, int *rMonth=0, int *rYear=0) const; ///< decode "yearday" to the actual year, month, day if provided

    // access to other subsystems

    const Phenology &phenology(const int phenologyGroup) const; ///< phenology class of given type

    const Sun &sun() const { return mSun; } ///< solar radiation class

    double daylength_h(const int doy) const { return sun().daylength(doy); } ///< length of the day in hours

private:

    Sun mSun; ///< class doing solar radiation calculations

    void load(); ///< load mLoadYears years from database

    void setupPhenology(); ///< setup of phenology groups

    void climateCalculations(ClimateDay &lastDay); ///< more calculations done after loading of climate data

    ClimateDay mInvalidDay;

    int mLoadYears; // count of years to load ahead

    int mCurrentYear; // current year (relative)

    int mMinYear; // lowest year in store (relative)

    int mMaxYear;  // highest year in store (relative)

    ClimateDay *mBegin; // pointer to the first day of the current year

    ClimateDay *mEnd; // pointer to the last day of the current year (+1)

    QVector<ClimateDay> mStore; ///< storage of climate data

    QVector<int> mDayIndices; ///< store indices for month / years within store

    QSqlQuery mClimateQuery; ///< sql query for db access

    QList<Phenology> mPhenology; ///< phenology calculations

};

#endif // CLIMATE_H