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

#if 0
  #define PFILE "sample.txt"
#else
  #define PFILE "input.txt"
#endif

size_t valid_passwds1;
size_t valid_passwds2;

void Parts()
{
  char ch;
  FILE *fp;
  fp = fopen(PFILE, "r");
  if(fp == NULL) assert(0);

  size_t passwd_cap = 100;
  size_t tstr_cap = 4;
  
  int num1 = 0;
  int num2 = 0;
  char passwd_char;
  char password[passwd_cap];  size_t passwd_sz = 0;
  
  char temp_str1[tstr_cap]; size_t i_tstr1 = 0;
  char temp_str2[tstr_cap]; size_t i_tstr2 = 0;
  char temp_str3[passwd_cap]; size_t i_tstr3 = 0;
  
  int mode = 0; // 0-read nums; 1-read num2; 2-read char; 3-read pass
  while((ch = fgetc(fp)) != EOF)
  {
    // Parse
    if(mode == 0)
    {
      if(ch == '-') { i_tstr1 = 0; mode = 1; continue; }
      temp_str1[i_tstr1] = ch;
      i_tstr1 += 1;
      assert(i_tstr1 < tstr_cap);
    }
    else if(mode == 1)
    {
      if(ch == ' ') { i_tstr2 = 0; mode = 2; continue; }
      temp_str2[i_tstr2] = ch;
      i_tstr2 += 1;
      assert(i_tstr2 < tstr_cap);
    }
    else if(mode == 2)
    {
      if(ch == ':') continue;
      if(ch == ' ') { mode = 3; continue; };
      passwd_char = ch;
    }
    else if(mode == 3)
    {
      if(ch != '\n')
      {
	temp_str3[i_tstr3] = ch;
	i_tstr3 += 1;
	assert(i_tstr3 < passwd_cap);
      }
      else
      {
	passwd_sz= i_tstr3;
	i_tstr3 = 0;
	mode = 0;
      }
    }

    if(ch == '\n')
    {
      temp_str1[tstr_cap - 1] = '\0';
      temp_str2[tstr_cap - 1] = '\0';
      temp_str3[passwd_sz] = '\0';
      num1 = atoi(temp_str1);
      num2 = atoi(temp_str2);
      strcpy(password, temp_str3);
      
      // reset all vars
      memset(temp_str1, 0, sizeof(char)*tstr_cap);
      memset(temp_str2, 0, sizeof(char)*tstr_cap);
      memset(temp_str3, 0, sizeof(char)*passwd_cap);

      // ## Part 1 ##
      // check password validity
      size_t seen_char = 0;
      for(int i=0; i<passwd_sz; i++)
	if(password[i] == passwd_char) seen_char += 1;     
      if(seen_char >= num1 && seen_char <= num2) valid_passwds1 += 1;

      // ## Part 2 ##
      if(!(password[num1-1] == passwd_char) != !(password[num2-1] == passwd_char)) //XOR !a != !b
	valid_passwds2 += 1;
    }
  }
  
  fclose(fp);

  printf("RESULT-1: %d\n", valid_passwds1);
  printf("RESULT-2: %d\n", valid_passwds2);
}

int main()
{
  Parts();
  return 0;
}