#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <fcntl.h>
#include <assert.h>
#include <zlib.h>
#include "cement.h"
#include "pnmutils.h"

/* Global Variables */
int verbose=0;
double powLookup[256];

/* Function declarations */
inline double createValue(unsigned char a,double weight);
void initilizeLookup(double p);
void usage(char *string);
void parse_commandline(int argc, char ** argv,
                       struct image_params * a_params,
                       double *R,
                       double *G,
                       double *B,
                       char ** output_filename);

int main(int argc, char ** argv)
{
    struct image_params a_params={NULL,0,0,0,0};
    char * dest_filename=NULL;
//    FILE * a, * dest;
    double p=EXPONENT;  /* exponent for pow */
    double p_inv;  /* 1.0/p */
    unsigned char a_pixel[ARRAY_SIZE];
    double out_pixel[ARRAY_SIZE];
    int i,j;
    int channels_per_pixel;
    double R,G,B;

    /* Timing measurments */
    struct timeval timeValStart;
    struct timeval timeValEnd;
    struct timezone timeZone;
    int minutes;
    double seconds=0.0;
#ifdef GET_TIME_MEASUREMENTS
    struct timeval runTimeStart;
    struct timeval runTimeStop;
    double fileReadTime=0.0;
    double fileWriteTime=0.0;
    double computeTime=0.0;
#endif
    
    unsigned int numberOfPixels;

    /* Compression variables */
    int agz=0;
    int destgz=0;
//    gzFile file;
    char outmode[20];
    char string[MAX_STRING_LENGTH];

    strcpy(outmode, "wb6 ");
    
    p_inv=1.0/p;

    parse_commandline(argc, argv, &a_params, &R,&G,&B,&dest_filename);

    if(isGZIPFile(a_params.filename)==0)
    {
        if ((a=fopen(a_params.filename, "r"))==NULL)
        {
            fprintf(stderr, "Unable to open %s.\n", a_params.filename);
            exit(EXIT_FAILURE);
        }
    }
    else
    {
        if ((agz=open(a_params.filename,O_RDONLY))<0)
        {
            fprintf(stderr, "Unable to open %s. %d\n", ".gz",destgz);
            exit(EXIT_FAILURE);
        }
        compressFileInputA=1;
        inFileA = gzdopen(agz, "rb");
        a=(FILE*)&inFileA;
    }
    
    if (dest_filename==NULL)
    {
        fprintf(stderr, "ERROR: There is no destination file.\n");
        exit(EXIT_FAILURE);
    }

    if(isGZIPFile(dest_filename)==0)
    {
        if ((dest=fopen(dest_filename, "w"))==NULL)
        {
            fprintf(stderr, "Unable to open %s.\n", dest_filename);
            exit(EXIT_FAILURE);
        }
    }
    else
    {
        if ((destgz=creat(dest_filename,00600))<0)
        {
            fprintf(stderr, "Unable to open %s.\n",dest_filename);
            exit(EXIT_FAILURE);
        }
        compressFileOutput=1;
        outFileDest = gzdopen(destgz, outmode);
        if(outFileDest==NULL)
            printf("Error opening gz file.\n");
        dest=(FILE*)&outFileDest;
    }

    get_image_params(a, &a_params);

    if (a_params.type=='6')
        channels_per_pixel=3;
    else
    {
        fprintf(stderr, "Input image must be type P6 and it is of type P%c\n",a_params.type);
        exit(EXIT_FAILURE);
    }


    sprintf(string, "P%c\n", 'A');
    filewrite(string,sizeof(unsigned char),strlen(string),dest);
    
    sprintf(string, "# %s %s %s %s %s %s %s\n",argv[0],argv[1],argv[2],argv[3],
            argv[4],argv[5],argv[6]);
    filewrite(string,sizeof(unsigned char),strlen(string),dest);

    sprintf(string, "%d %d\n%d\n%d\n%f\n",a_params.width,
            a_params.height, a_params.max_val,1,(float)EXPONENT);
    filewrite(string,sizeof(unsigned char),strlen(string),dest);


    /*    fprintf(dest, "P%c\n", 'A');

    fprintf(dest, "#Generated by %s\n",argv[0]);

    fprintf(dest, "%d %d\n%d\n", a_params.width,
            a_params.height, a_params.max_val);

    fprintf(dest, "%f\n",EXPONENT);
*/

#ifdef SILENT_RUN

    printf("Init %s, R%1.1f G%1.1f B%1.1f\r",a_params.filename,R,G,B);
#else

    printf("Initilizing Lightspace from file: \"%s\",",a_params.filename);
    printf(" P%c, %dx%d, Channels_per_pixel: %d, ",a_params.type,a_params.width,a_params.height,channels_per_pixel);

    printf("R=%7.3f ",R);
    printf("G=%7.3f ",G);
    printf("B=%7.3f\n",B);
#endif
    
    initilizeLookup(p);

    /* Start Timer */
    if(gettimeofday(&timeValStart,&timeZone)==-1)
    {
        fprintf(stderr,"Error getting the time\n");
        exit(0);
    }

    numberOfPixels=a_params.width*a_params.height;

    if(((float)numberOfPixels/NUMBER_PIXELS_PER_READ)!=(int)((float)numberOfPixels/NUMBER_PIXELS_PER_READ))
    {
        if(verbose)
            printf("\nERROR: The number of pixels %d is not evenly divisible by %d. ",numberOfPixels,NUMBER_PIXELS_PER_READ);

        numberOfPixels=(int)((float)numberOfPixels/NUMBER_PIXELS_PER_READ)*NUMBER_PIXELS_PER_READ;
        if(verbose)
            printf("We will go up to %d pixels.\n",numberOfPixels);
    }

    for(i=0;i<numberOfPixels;i+=NUMBER_PIXELS_PER_READ)
    {
        if(i%(3*NUMBER_PIXELS_PER_READ)==0)
        {
            printf("Init %s, R%1.1f G%1.1f B%1.1f %5.2f%%\r",a_params.filename,R,G,B,(double)100*i/numberOfPixels);
            fflush(stdout);
        }

        
#ifdef GET_TIME_MEASUREMENTS
        gettimeofday(&runTimeStart,&timeZone);
#endif

        fileread(a_pixel, sizeof(unsigned char), ARRAY_SIZE, a);

#ifdef GET_TIME_MEASUREMENTS
        gettimeofday(&runTimeStop,&timeZone);

        seconds=(double)runTimeStop.tv_sec+(double)runTimeStop.tv_usec/1000000;
        seconds-=(double)runTimeStart.tv_sec+(double)runTimeStart.tv_usec/1000000;
        fileReadTime+=seconds;

        gettimeofday(&runTimeStart,&timeZone);
#endif
        
        for(j=0;j<ARRAY_SIZE;j+=3)
        {
            out_pixel[j]=createValue(a_pixel[j],R);
            out_pixel[j+1]=createValue(a_pixel[j+1],G);
            out_pixel[j+2]=createValue(a_pixel[j+2],B);
        }

#ifdef GET_TIME_MEASUREMENTS
        gettimeofday(&runTimeStop,&timeZone);

        seconds=(double)runTimeStop.tv_sec+(double)runTimeStop.tv_usec/1000000;
        seconds-=(double)runTimeStart.tv_sec+(double)runTimeStart.tv_usec/1000000;

        computeTime+=seconds;

        gettimeofday(&runTimeStart,&timeZone);
#endif
        
        filewrite(out_pixel, sizeof(double), ARRAY_SIZE, dest);

#ifdef GET_TIME_MEASUREMENTS
        gettimeofday(&runTimeStop,&timeZone);

        seconds=(double)runTimeStop.tv_sec+(double)runTimeStop.tv_usec/1000000;
        seconds-=(double)runTimeStart.tv_sec+(double)runTimeStart.tv_usec/1000000;
        fileWriteTime+=seconds;
#endif
    }

    if(numberOfPixels!=(a_params.width*a_params.height))
    {
        if(verbose)
            printf("Cleanup on pixels %d to %d\n",numberOfPixels,a_params.width*a_params.height);

        for(i=numberOfPixels;i<a_params.width*a_params.height;i++)
        {
            fileread(a_pixel, sizeof(double),CHANNELS_PER_PIXEL, a);

            out_pixel[0]=createValue(a_pixel[0],R);
            out_pixel[1]=createValue(a_pixel[1],G);
            out_pixel[2]=createValue(a_pixel[2],B);
            filewrite(out_pixel, sizeof(double), CHANNELS_PER_PIXEL, dest);
        }
    }

    /* End timer */
    if(gettimeofday(&timeValEnd,&timeZone)==-1)
    {
        printf("Error getting the time\n");
        exit(0);
    }

    while (!fileeof(a))
    {
        fileread(a_pixel, sizeof(double),CHANNELS_PER_PIXEL, a);
        if(fileeof(a))
            break;
        
        out_pixel[0]=createValue(a_pixel[0],R);
        out_pixel[1]=createValue(a_pixel[1],G);
        out_pixel[2]=createValue(a_pixel[2],B);
        printf("EP A: %d %d %d\t",a_pixel[0],a_pixel[1],a_pixel[2]);
        printf("OUT: %f %f %f\n",out_pixel[0],out_pixel[1],out_pixel[2]);
        filewrite(out_pixel, sizeof(double), CHANNELS_PER_PIXEL, dest);
    }

    if(isGZIPFile(a_params.filename)==0)
        fclose(a);
    else
    {
        if (gzclose(inFileA) != Z_OK)
            printf("failed gzclose\n");
        close(agz);
    }
    
    if(isGZIPFile(dest_filename)==0)
        fclose(dest);
    else
    {
        if (gzclose(outFileDest) != Z_OK)
            printf("failed gzclose\n");
        close(destgz);
    }
    seconds=(double)timeValEnd.tv_sec+(double)timeValEnd.tv_usec/1000000;
    seconds-=(double)timeValStart.tv_sec+(double)timeValStart.tv_usec/1000000;

#ifdef GET_TIME_MEASUREMENTS
    printf("%f s doing File Read %f%%\n",fileReadTime,100*fileReadTime/seconds);
    printf("%f s doing File Writes %f%%\n",fileWriteTime,100*fileWriteTime/seconds);
    printf("%f s doing Computation %f%%\n",computeTime,100*computeTime/seconds);
    printf("%f s doing Timing and looping\n",seconds-fileReadTime-fileWriteTime-computeTime);
#endif
    
    if(seconds>60)
    {
        minutes=seconds/60;
        seconds=seconds-minutes*60;
    }
    else
        minutes=0;

    if(verbose || GET_RUN_TIME)
    {
#ifndef SILENT_RUN
        if(minutes==1)
            printf("Run Time is about %d minute %f seconds.\n",minutes,seconds);
        else
            printf("Run Time is about %d minutes %f seconds.\n",minutes,seconds);
#else
        printf("Init %s, R%1.1f G%1.1f B%1.1f %f(s)\n",a_params.filename,R,G,B,minutes*60+seconds);
#endif
    }
    exit(EXIT_SUCCESS);
}

void initilizeLookup(double p)
{
    int i;

    for(i=0;i<256;i++)
        powLookup[i]=pow((double)i,p);
}

inline double createValue(unsigned char a,double weight)
{
    return(weight*powLookup[a]);
}

void usage(char *string)
{
    fprintf(stderr, "Use: %s [Imagespace file] <R> <G> <B> -o [Lightspace file]\n",string);
    fprintf(stderr, " [Imagespace file] is a ppm file that will start a lightspace.\n");
    fprintf(stderr, " <R>=Float for Red weight.\n");
    fprintf(stderr, " <G>=Float for Green weight.\n");
    fprintf(stderr, " <B>=Float for Blue weight.\n");
    fprintf(stderr, " [LightSpaceFile] is a Portable Lightspace Map (plm) that will be created.\n");
    exit(EXIT_SUCCESS);
}



void parse_commandline(int argc, char ** argv,
                       struct image_params * a_params,
                       double *R,
                       double *G,
                       double *B,
                       char ** output_filename)
{
    int i;

    if (argc<3)
    {
        fprintf(stderr,"number of input arguments was only %d\n",argc);
        usage(argv[0]);
    }

    for (i=1;i<argc;i++)
    {
        if (!strcasecmp(argv[i], "-o"))
        {
            if ((i+1)>=argc)
                usage(argv[0]); /* e.g. if last argument not output file */
            *output_filename=(char *)strdup(argv[++i]);
        }
        else
            if (a_params->filename==NULL)
                a_params->filename=(char *)strdup(argv[i]); /* if file a still null */

        sscanf(argv[2],"%lf",R); /* sscanf does not recognize %g, must be %lf */
        sscanf(argv[3],"%lf",G); /* sscanf does not recognize %g, must be %lf */
        sscanf(argv[4],"%lf",B); /* sscanf does not recognize %g, must be %lf */
    }

    if ((a_params->filename==NULL))
        usage(argv[0]);
}