#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>

#include <unistd.h>

#include <stdbool.h>


 // Assumes: errnum is a valid error number
 // denne er ikke implementeret endnu, men det behøver vi nok heller ikke
int print_error(char *path, int errnum) {
  return fprintf(stdout, "%s: cannot determine (%s)\n",
    path, strerror(errnum));
}

bool ASCII(int c){

   if ((c >= 7 && c <= 13) || (c == 27) ||  ( c >= 32 && c <= 126 )) {
      //printf("%s: ASCII text\n", file );
      return true;
   } else
   {
      return false;
   }

}

// hvis både ascii og ISO er true, er det en ascii-fil

bool ISO(int c){
   if ((c >= 7 && c <= 13) || (c == 27) || (c >= 32 && c <= 126) ||(c >= 160 && c <= 255)){
      //printf("%s: ISO text\n", file );
      return true;
   } else
   {
      return false;
   }

}

void toArray(int c, int counter, int coolArray){
    // coolArray skal i littel være = int coolArray[] = {92, 120, 70, 70, 92, 120, 70, 69 }; lol
   coolArray[counter] = c;
}


bool littleEndian(int coolArray[]){
   char checkArray[] = "\xFF\xFE";
   for (int i = 0; i < 8; i++){
      if ((int)checkArray[i] != coolArray[i]){
         return false;
      }
   }
   return true;
}

bool bigEndian(int coolArray[]){
   char checkArray[] = "\xFE\xFF";
   for (int i = 0; i < 8; i++){
      if ((int)checkArray[i] != coolArray[i]){
         return false;
      }
   }
   return true;
}


int main(int argc, char* argv[]){
    bool AsciiPossible = true;
    bool ISOPossible = true;
    bool LittleEndianPossible = true;
    bool BigEndianPossible = true;
    int coolArray[8];
    if (argc==1) {
        fprintf(stdout, "Usage: file path");
        return EXIT_FAILURE;
    }
    char* file = argv[1];

    FILE* filePath;
    int c;

    int counter = 0;

    filePath = fopen(file,"r");

    if (errno == EACCES) {
       printf("%s: cannot determine (Permission denied)\n", file);
       return EXIT_FAILURE;
    }

    if (filePath == NULL) {
      printf("%s: cannot determine (No such file or directory)\n", file);
      return(EXIT_SUCCESS);
    }
    // måske vi skulle bruge det fra A0 istedet. tror ikke det er såå vigtigt


    while(1) {

        c = fgetc(filePath);

        if( feof(filePath) ) {
         if (counter == 0){
            printf("%s: empty\n", file );
            return(0);
            //hertil tjekker vi om den er tom
         }
        }
         if (feof(filePath)){
            break;
         }

         toArray(c, counter, coolArray);

         if (AsciiPossible){
            AsciiPossible = ASCII(c);
         }
         if (ISOPossible){
            ISOPossible = ISO(c);
         }
         if (LittleEndianPossible && counter ==8){
            LittleEndianPossible = littleEndian(coolArray);
         }
         if (BigEndianPossible && counter == 8 ){
            BigEndianPossible = bigEndian(coolArray);
         }

         counter++;


   }
   fclose(filePath);

   return(0);
}