#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

#include "btree.h"

#define DEFAULTBEG  0
#define DEFAULTEND -1
#define DEFAULTFILENAME "/usr/local/csci/343/testdata/prog01.bt"

main(int argc, char *argv[])
 {
  int rc ;
  int errflg = 0 ;
  char *begArg = NULL ;
  char *endArg = NULL ;
  char *filArg = NULL ;
  char *recArg = NULL ;
  char *atoiHack = NULL ;
  int begPos ;
  int endPos ;
  FILE * dbFile ;
  int dbLen ;
  char usage[]
        = "ezsearch [-b start-pos] [-e end-pos] [-f file-name] record-key\n" ;
  simpRecT buff ;

  optarg = NULL ;
  while ((rc = getopt(argc, argv, "b:e:f:")) != -1)
    switch (rc) {
    case 'b':
      begArg = optarg ;
      break ;
    case 'e':
      endArg = optarg ;
      break ;
    case 'f':
      filArg = optarg ;
      break ;
    default:
      errflg = 1 ;
    }
  if (optind == argc-1)
    recArg = argv[optind] ;
  else
    errflg = 1 ;
  if (errflg) {
    (void) fputs(usage, stderr) ;
    exit(1) ;
  }
  errno = 0 ;
  if (begArg == NULL)
    begPos = DEFAULTBEG ;
  else {
    begPos = (int) strtol(begArg, &atoiHack, 10) ;
    if (begPos<0 || errno || atoiHack[0]) {
      (void) fprintf(stderr, "Bad option for -b: %s\n", begArg) ;
      errflg = 1 ;
      errno = 0 ;
    }
  }

  if (endArg == NULL)
    endPos = DEFAULTEND ;
  else {
    endPos = (int) strtol(endArg, &atoiHack, 10) ;
    if (endPos<0 || errno || atoiHack[0]) {
      (void) fprintf(stderr, "Bad option for -e: %s\n", endArg) ;
      errflg = 1 ;
      errno = 0 ;
    }
  }

  if (endPos >= 0 && (begPos>endPos)) {
    (void) fprintf(stdout, "-b option (%d) greater than -e option (%d)\n",
		   begPos, endPos) ;
    errflg = 1 ;
  }

  if (filArg == NULL)
    filArg = DEFAULTFILENAME ;

  if (errflg)
    exit(1) ;

  if ((dbFile = fopen(filArg, "r")) == (FILE *)NULL) {
    (void) fprintf(stderr, "Unable to open %s\n", filArg) ;
    perror("fopen") ;
    exit(1) ;
  }

  if (fseek(dbFile, 0L, SEEK_END)) {
    /* very, very unlikely */
    (void) fprintf(stderr, "Unable to seek %s\n", filArg) ;
    perror("fseek") ;
    exit(1) ;
  }

  dbLen = ftell(dbFile)/sizeof(simpRecT) ;
  rewind(dbFile) ;

  if (begPos >= dbLen) {
    (void) fprintf(stderr, "-b option (%d) exceeds records in file\n",begPos) ;
    exit(1) ;
  }

  if (endPos == -1)
    endPos = dbLen-1 ;
  else if (endPos > dbLen) {
    (void) fprintf(stderr, "-e option (%d) exceeds records in file\n",endPos) ;
    exit(1) ;
  }



  (void) fprintf(stdout, "Searching for %s\n", recArg);
  (void) fprintf(stdout, "  in %s\n", filArg) ;
  (void) fprintf(stdout, "  from %d to %d\n\n", begPos, endPos) ;

  if (rangeSearch(recArg, dbFile, begPos, endPos, &buff))
    (void) fprintf(stdout, "%.12s found with key %d (%08x)\n",
		   buff.name, buff.value, buff.value) ;
  else
    (void) fputs("Record not found!\n", stdout) ;

  (void) fclose(dbFile) ;

 }