#include <stdio.h>
#include <time.h>
#include <stdlib.h>

// Forward declaration for rand_range function, so that main won't get confused
int rand_range(int min, int max);

// The first command line argument is the max # of guesses,
// the second and third are the min and max of range respectively
int main(int argc, char *argv[])
{
  // Checking if the proper number of command line args have been passed
  if(argc != 4) {
    fprintf(stderr, "Usage: %s <max-guesses> <min> <max>\n", argv[0]);
    exit(1);
  }

  // Parsing command line args as ints
  int max_guesses = atoi(argv[1]);
  int min = atoi(argv[2]);
  int max = atoi(argv[3]);
  int nguesses = 0;
  int guess;

  // Choose number and seed random number generator
  srand(time(NULL));
  int answer = rand_range(min, max);

  // Game loop
  while(nguesses < max_guesses) {
    nguesses++;
    printf("Enter an integer between %d and %d: ", min, max);
    scanf("%d", &guess);

    // Check if they guessed correctly
    if(guess == answer) {
      // They guessed correctly and win
      printf("You win. Score: %d\n", nguesses);
      exit(0);
    } else if(guess < answer) {
      printf("Higher.\n");
    } else {
      printf("Lower.\n");
    }
  } 

  // They are out of guesses and they lose
  printf("You lose. The answer is %d.\n", answer);

  return 0;
}

// Produces a random number in a specified range
// Source: https://www.geeksforgeeks.org/generating-random-number-range-c/
int rand_range(int min, int max)
{
  return (rand() % (max - min + 1)) + min;
}