/* ctotal.c

   Compile with:   gcc -g ctotal.c -lm -o ctotal
   Example run:    ctotal hs23b_intvfile.l6 60 299

   Example output: from: 0.601 to: 0.666 fp: 56 fn: 106 total: 162 (299) 60 l=6

   Given an interval file, it outputs the interval of anchor values for
   which the best "total" (fn+fp) count is obtained, providing that
   only the runs with at least the specified percentage of true
   positives are included.  The intv_file denomination must contain the 
   length specification. In the example above, the best a-interval
   for phylogen runs on the combined hs23b region with l=6 (ct) which
   exceed 60% true positives (ie, < 40% fn) is [0.601,0.666]. The fp,
   fn and total counts  are: 56, 106 and 162 respectively. 299 is the
   total length of the known functional regions (maxfn).

   NOTE: Used in 'cut' experiments on combined regions, where the data 
   files are in interval format.
*/

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/param.h>


#define Usage "%s <input file> <pct> <length>"

void fatal(char *message);
void fatalf(char *msg, char *val);
FILE *ckopen(char *name, char *mode);
int get_len(char *s);


int main(int argc, char *argv[])
{
    char   buffer[200], cmd[100];
    int    i, k, length, pct, best_k, best, thresh;
    double from[1000], to[1000];
    int    fn[1000], fp[1000];
    FILE  *file;
    
    if (argc!=4) fatalf(Usage, argv[0]);
    pct = atoi(argv[2]);
    length = atoi(argv[3]);
    thresh = ((100-pct)*length)/100;
    best = 100000; best_k = -1;
  
    file = ckopen(argv[1],"r");
    k = 0;
    while (fgets(buffer,200,file)!=NULL) {
       if (buffer[0]=='#') continue;
 
       sscanf(buffer,"%lf %lf %d %d", 
                     &from[k], &to[k], &fp[k], &fn[k]);
       if (fn[k]>thresh) continue;
       if (fp[k]+fn[k]<best) { best = fp[k]+fn[k]; best_k = k; }
       k++;
    }
    fclose(file);
    if (best_k >= 0)
        printf("from: %1.3lf to: %1.3lf fp: %d fn: %d total: %d (%d)   %d  l=%d\n",
                from[best_k], to[best_k], fp[best_k], fn[best_k], 
                fp[best_k]+fn[best_k], length, pct, get_len(argv[1]));
/*
    i = k-1;
    while ((i>=1) && (fp[i]==fp[i-1])) i--;
    printf("Best_fpos %d:  from: %1.3lf to: %1.3lf fp: %d fn: %d total: %d (%d)\n",
            pct, from[i], to[i], fp[i], fn[i], fp[i]+fn[i], length);
*/

    return 0;
}

int get_len(char *s) 
{
    int len;
    char *p = s;

    while (*p && !isspace(*p) && ((*p!='l') || ((*p=='l') && (!isdigit(*(p+1)))))) p++;
    sscanf(p+1,"%d",&len);

    return len;
}

void fatal(char *msg)
{                
        (void)fprintf(stderr, "%s\n", msg);
        exit(1); 
}    
     
void fatalf(char *msg, char *val)
{    
        (void)fprintf(stderr, msg, val);  
        (void)putc('\n', stderr);
        exit(1);
}            
          
FILE *ckopen(char *name, char *mode)
{    
        FILE *fp;
     
        if ((fp = fopen(name, mode)) == NULL)
                fatalf("Cannot open %s.", name);
        return fp;
}