// Lecture Example recap strings

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

#define MAX_LEN 100

void remove_trailing_nl(char s[]);
int all_lowercase(char s[]);
void reverse(char s[MAX_LEN], char reverse_s[MAX_LEN]);

int main(void) {
    char str[MAX_LEN];
    char reverse_s[MAX_LEN];

    printf("Enter a string: ");
    while (fgets(str, MAX_LEN, stdin) != NULL) {
        remove_trailing_nl(str);
        printf("You typed in %s\n", str);
        if (strcmp("cake", str) == 0) {
            printf("hooray there is cake\n");
        } 

        if (all_lowercase(str) == 1) {
            printf("You have all lower case characters\n");
        }

        reverse(str, reverse_s);
        printf("%s\n", reverse_s);

        printf("Enter a string: ");
    }

    return 0;
}


// Remove the trailing newline character of the string
// if it exists
void remove_trailing_nl(char s[]) {
    int len = strlen(s);
    if (s[len - 1] == '\n') {
        s[len - 1] = '\0';
    }
}

// returns 1 if all characters (except '\0') are lowercase
// returns 0 otherwise
int all_lowercase(char s[]) {
    int all_lower = 1;
    for (int i = 0; s[i] != '\0'; i++) {
        if (s[i] < 'a' || s[i] > 'z') {
            all_lower = 0;
        }
    }
    return all_lower;
}

// Make a reverse copy of the string in the s array input
// and put the reverse copy in the reverse_s array input
// Note: We need to make sure that reverse_s is big enough
void reverse(char s[MAX_LEN], char reverse_s[MAX_LEN]) {
    int j = strlen(s) - 1;
    for (int i = 0; s[i] != '\0'; i++) {
        reverse_s[j] = s[i];
        j--;
    }
    reverse_s[strlen(s)] = '\0';
}