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#ifndef TREE_H

#define TREE_H

#include <QPointF>

#include "grid.h"

// forwards

class Species;

class Stamp;

class ResourceUnit;

struct HeightGridValue;

struct TreeGrowthData;

class TreeOut;

class Tree

{

public:

    // lifecycle

    Tree();

    void setup();

    // access to properties

    int id() const { return mId; }

    int age() const { return mAge; }

    /// @property position The tree does not store the floating point coordinates but only the index of pixel on the LIF grid

    const QPointF position() const { Q_ASSERT(mGrid!=0); return mGrid->cellCenterPoint(mPositionIndex); }

    const Species* species() const { Q_ASSERT(mRU!=0); return mSpecies; } ///< pointer to the tree species of the tree.

    const ResourceUnit *ru() const { Q_ASSERT(mRU!=0); return mRU; } ///< pointer to the ressource unit the tree belongs to.

    // properties

    float dbh() const { return mDbh; } ///< dimater at breast height in cm

    float height() const { return mHeight; } ///< tree height in m

    float lightResourceIndex() const { return mLRI; } ///< LRI of the tree (updated during readStamp())

    float leafArea() const { return mLeafArea; } ///< leaf area (m2) of the tree

    double volume() const; ///< volume (m3) of stem volume based on geometry and density calculated on the fly.

    double basalArea() const; ///< basal area of the tree at breast height in m2

    bool isDead() const { return flag(Tree::TreeDead); } ///< returns true if the tree is already dead.

    // actions

    void die(TreeGrowthData *d=0); ///< kills the tree.

    void remove(); ///< remove the tree (management)

    void enableDebugging(const bool enable=true) {setFlag(Tree::TreeDebugging, enable); }

    // setters for initialization

    void setNewId() { mId = m_nextId++; } ///< force a new id for this object (after copying trees)

    void setId(const int id) { mId = id; } ///< set a spcific ID (if provided in stand init file).

    void setPosition(const QPointF pos) { Q_ASSERT(mGrid!=0); mPositionIndex = mGrid->indexAt(pos); }

    void setPosition(const QPoint posIndex) { mPositionIndex = posIndex; }

    void setDbh(const float dbh) { mDbh=dbh; }

    void setHeight(const float height) { mHeight=height; }

    void setSpecies(Species *ts) { mSpecies=ts; }

    void setRU(ResourceUnit *ru) { mRU = ru; }

    void setAge(const int age, const float treeheight);

    // grid based light-concurrency functions

    void applyLIP(); ///< apply LightInfluencePattern onto the global grid

    void readLIF(); ///< calculate the lightResourceIndex with multiplicative approach

    void heightGrid(); ///< calculate the height grid

    void applyLIP_torus(); ///< apply LightInfluencePattern on a closed 1ha area

    void readLIF_torus(); ///< calculate LRI from a closed 1ha area

    void heightGrid_torus(); ///< calculate the height grid

    void calcLightResponse(); ///< calculate light response

    // growth, etc.

    void grow(); ///< main growth function to update the tree state.

    // static functions

    static void setGrid(FloatGrid* gridToStamp, Grid<HeightGridValue> *dominanceGrid);

    // statistics

    static void resetStatistics();

    static int statPrints() { return m_statPrint; }

    static int statCreated() { return m_statCreated; }

    QString dump();

    void dumpList(QList<QVariant> &rTargetList);

private:

    // helping functions

    void partitioning(TreeGrowthData &d); ///< split NPP into various plant pools.

    double relative_height_growth(); ///< estimate height growth based on light status.

    void grow_diameter(TreeGrowthData &d); ///< actual growth of the tree's stem.

    void mortality(TreeGrowthData &d); ///< main function that checks whether trees is to die

    // state variables

    int mId; ///< unique ID of tree

    int mAge; ///< age of tree in years

    float mDbh; ///< diameter at breast height [cm]

    float mHeight; ///< tree height [m]

    QPoint mPositionIndex; ///< index of the trees position on the basic LIF grid

    // biomass compartements

    float mLeafArea; ///< m2 leaf area

    float mOpacity; ///< multiplier on LIP weights, depending on leaf area status (opacity of the crown)

    float mFoliageMass; // kg

    float mWoodyMass; // kg

    float mFineRootMass; // kg

    float mCoarseRootMass; // kg

    // production relevant

    float mNPPReserve; // kg

    float mLRI; ///< resulting lightResourceIndex

    float mLightResponse; ///< light response used for distribution of biomass on RU level

    // auxiliary

    float mDbhDelta; ///< diameter growth [cm]

    float mStressIndex; ///< stress index (used for mortality)

    // Stamp, Species, Resource Unit

    const Stamp *mStamp;

    Species *mSpecies;

    ResourceUnit *mRU;

    // various flags

    int mFlags;

    enum Flags { TreeDead=1, TreeDebugging=2 }; ///< (binary coded) tree flags

    void setFlag(const Tree::Flags flag, const bool value) { if (value) mFlags |= flag; else mFlags &= (flag ^ 0xffffff );}

    bool flag(const Tree::Flags flag) const { return mFlags & flag; }

    // special functions

    bool isDebugging() { return flag(Tree::TreeDebugging); }

    // static data

    static FloatGrid *mGrid;

    static Grid<HeightGridValue> *mHeightGrid;

    // statistics

    static int m_statPrint;

    static int m_statAboveZ;

    static int m_statCreated;

    static int m_nextId;

    // friends

    friend class TreeWrapper;

    friend class StandStatistics;

    friend class TreeOut;

};

/// internal data structure which is passed between function and to statistics

struct TreeGrowthData

{

    double NPP; ///< total NPP (kg)

    double NPP_above; ///< NPP aboveground (kg) (NPP - fraction roots), no consideration of tree senescence

    double NPP_stem;  ///< NPP used for growth of stem (dbh,h)

    double stress_index; ///< stress index used for mortality calculation

    TreeGrowthData(): NPP(0.), NPP_above(0.), NPP_stem(0.) {}

};

#endif // TREE_H