/*
*  This file is part of RawTherapee.
*
*  Copyright (c) 2012 Oliver Duis <www.oliverduis.de>
*
*  RawTherapee is free software: you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation, either version 3 of the License, or
*  (at your option) any later version.
*
*  RawTherapee 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
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include <array>
#include <map>
#include <string>
#include <sstream>

#include <glibmm.h>
#include <expat.h>

#include "imagefloat.h"
#include "opthelper.h"

namespace rtengine
{

// Perspective model common data, also used for Vignette and Fisheye
class LCPModelCommon final
{
public:
    LCPModelCommon();
    bool empty() const;  // is it empty
    void print() const;  // printf all values
    void merge(const LCPModelCommon& a, const LCPModelCommon& b, float facA);
    void prepareParams(int fullWidth, int fullHeight, float focalLength, float focalLength35mm, float sensorFormatFactor, bool swapXY, bool mirrorX, bool mirrorY);

//private:
    using Param = std::array<float, 5>;
    using VignParam = std::array<float, 4>;

    float foc_len_x;
    float foc_len_y;
    float img_center_x;
    float img_center_y;
    Param param;  // k1..k5, resp. alpha1..5
    float scale_factor;  // alpha0
    double mean_error;
    bool bad_error;

    // prepared params
    float x0;
    float y0;
    float fx;
    float fy;
    float rfx;
    float rfy;
    VignParam vign_param;
};

class LCPPersModel
{
public:
    float focLen, focDist, aperture;  // this is what it refers to

    LCPModelCommon base;  // base perspective correction
    LCPModelCommon chromRG, chromG, chromBG;  // red/green, green, blue/green (may be empty)
    LCPModelCommon vignette;  // vignette (may be empty)

    LCPPersModel();
    bool hasModeData(int mode) const;
    void print() const;
};


class LCPProfile
{
    // Temporary data for parsing
    bool inCamProfiles, firstLIDone, inPerspect, inAlternateLensID, inAlternateLensNames;
    char lastTag[256], inInvalidTag[256];
    LCPPersModel* pCurPersModel;
    LCPModelCommon* pCurCommon;

    static void XMLCALL XmlStartHandler(void *pLCPProfile, const char *el, const char **attr);
    static void XMLCALL XmlTextHandler (void *pLCPProfile, const XML_Char *s, int len);
    static void XMLCALL XmlEndHandler  (void *pLCPProfile, const char *el);

    int filterBadFrames(double maxAvgDevFac, int minFramesLeft);

    void handle_text(std::string text);
    std::ostringstream textbuf;

public:
    // Common data
    Glib::ustring profileName, lensPrettyName, cameraPrettyName, lens, camera;  // lens/camera(=model) can be auto-matched with DNG
    bool isRaw, isFisheye;
    float sensorFormatFactor;
    int persModelCount;

    // The correction frames
    static const int MaxPersModelCount = 3000;
    LCPPersModel* aPersModel[MaxPersModelCount];  // Do NOT use std::list or something, it's buggy in GCC!

    explicit LCPProfile(const Glib::ustring &fname);
    ~LCPProfile();

    void calcParams(int mode, float focalLength, float focusDist, float aperture, LCPModelCommon *pCorr1, LCPModelCommon *pCorr2, LCPModelCommon *pCorr3) const;  // Interpolates between the persModels frames

    void print() const;
};

class LCPStore
{
    MyMutex mtx;

    // Maps file name to profile as cache
    std::map<Glib::ustring, LCPProfile*> profileCache;

public:
    ~LCPStore();
    Glib::ustring getDefaultCommonDirectory() const;
    bool isValidLCPFileName(Glib::ustring filename) const;
    LCPProfile* getProfile(Glib::ustring filename);

    static LCPStore* getInstance();
};

#define lcpStore LCPStore::getInstance()


class LensCorrection {
public:
    virtual ~LensCorrection() {}
    virtual void correctDistortion(double &x, double &y, int cx, int cy, double scale) const = 0;
    virtual bool supportsAutoFill() const = 0;
    virtual bool supportsCA() const = 0;
    virtual void correctCA(double &x, double &y, int channel) const = 0;
    virtual void processVignetteLine(int width, int y, float *line) const = 0;
    virtual void processVignetteLine3Channels(int width, int y, float *line) const = 0;
};


// Once precalculated class to correct a point
class LCPMapper: public LensCorrection
{

    bool useCADist;  // should the distortion in the CA info be used?
    bool swapXY;
    LCPModelCommon mc;
    LCPModelCommon chrom[3];  // in order RedGreen/Green/BlueGreen
    bool isFisheye;

public:
    bool enableCA;  // is the mapper capable if CA correction?

    // precalculates the mapper.
    LCPMapper(LCPProfile* pProf, float focalLength, float focalLength35mm, float focusDist, float aperture, bool vignette, bool useCADistP, int fullWidth, int fullHeight,
              const CoarseTransformParams& coarse, int rawRotationDeg);

    void correctDistortion(double &x, double &y, int cx, int cy, double scale) const;  // MUST be the first stage
    bool supportsCA() const { return enableCA; }
    bool supportsAutoFill() const { return true; }
    void correctCA(double& x, double& y, int channel) const;
    void processVignetteLine(int width, int y, float *line) const;
    void processVignetteLine3Channels(int width, int y, float *line) const;
};

}