#include "types.h"
#include <stdio.h>

void read_print_string() {
  // TODO: 1. Read a string from stdin of max-length of 100 characters.
  printf("Enter a string (100 chars max):\n");
  char input[101];
  scanf("%100[^\n]", input);

  // TODO: 2. Print read string to stdout.
  printf("%s\n", input);
  return;
}

void read_print_string_length() {
  // TODO: 1. Read a string from stdin of max-length of 100 characters.
  printf("Enter a string (100 chars max):\n");
  char input[101];
  scanf(" %100[^\n]", input);

  // TODO: 2. Print the length of the read string to stdout. (do not count
  // '\0').
  for (int i = 0; i < 101; ++i) {
    if (input[i] == '\0') {
      printf("Length of your string is %d", i);
      break;
    }
  }
  return;
}

void read_print_string_alphnum() {
  // TODO: 1. Read a string from stdin of max-length of 100 characters.
  printf("Enter a string (100 chars max):\n");
  char input[101];
  scanf(" %100[^\n]", input);

  // TODO: 2. Print both the number of letters (a-z, A-Z) and the number of
  // numerals (0-9) in the read string to stdout.
  int letters = 0;
  int numbers = 0;
  for (int i = 0; i < 101; ++i) {
    if (input[i] == '\0') {
      break;
    }
    if ((input[i] >= 'a' && input[i] <= 'z') ||
        (input[i] >= 'A' && input[i] <= 'Z')) {
      letters++;
    } else if (input[i] >= '0' && input[i] <= '9') {
      numbers++;
    }
  }
  printf("Your string contains %d letters and %d numbers", letters, numbers);
  return;
}

void read_print_string_lower() {
  // TODO: 1. Read a string from stdin of max-length of 100 characters.
  printf("Enter a string (100 chars max):\n");
  char input[101];
  scanf(" %100[^\n]", input);

  // TODO: 2. Print the read string with all letters in lowercase (e.g., A => a)
  // to stdout.
  for (int i = 0; i < 101; ++i) {
    if ((input[i] >= 'A' && input[i] <= 'Z')) {
      input[i] += 32;
    }
  }
  printf("%s\n", input);
  return;
}

void read_print_string_replace() {
  // TODO: 1. Read a character and a string of max-length of 100 characters from
  // stdin.
  printf("Enter a single character:\n");
  char c;
  scanf(" %c", &c);

  printf("Enter a string (100 chars max):\n");
  char input[101];
  scanf(" %100[^\n]", input);

  // TODO: 2. Print the read string with all occurences of read string replaced
  // with '_' (e.g., ('a', "abba") => _bb_) to stdout.
  for (int i = 0; i < 101; ++i) {
    if (input[i] == '\0') {
      break;
    }
    if (input[i] == c) {
      input[i] = '_';
    }
  }
  printf("%s\n", input);
  return;
}

void read_print_string_compare() {
  // TODO: 1. Read  2 string, each of max-length of 100 characters, from stdin.
  printf("Enter a string (100 chars max):\n");
  char inputA[101];
  scanf(" %100[^\n]", inputA);

  printf("Enter another string (100 chars max):\n");
  char inputB[101];
  scanf(" %100[^\n]", inputB);

  // TODO: 2. Determine whether strings are equal (two strings are equal if they
  // have the same length and characters in both strings on a given index are
  // identical).
  int is = 1;
  for (int i = 0; i < 101; ++i) {
    if (inputA[i] == '\0' && inputB[i] == '\0') {
      break;
    }
    if (inputA[i] != inputB[i] || (inputA[i] == '\0') || (inputB[i] == '\0')) {
      is = 0;
      break;
    }
  }
  printf("%s", (is == 1) ? "The two strings ARE equal"
                         : "The two strings are NOT equal");
  return;
}

#ifndef TEST_BUILD

int main(int argc, char *argv[]) {
  printf("-- read_print_string --\n");
  read_print_string();
  printf("\n-- read_print_string_length --\n");
  read_print_string_length();
  printf("\n-- read_print_string_alphnum --\n");
  read_print_string_alphnum();
  printf("\n-- read_print_string_lower --\n");
  read_print_string_lower();
  printf("\n-- read_print_string_replace --\n");
  read_print_string_replace();
  printf("\n-- read_print_string_compare --\n");
  read_print_string_compare();
  return 0;
}

#endif