#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>

int getNumLetters(string text);
int getNumSentences(string text);
int getNumWords(string text);
int getGradeLevel(int numLetters, int numSentences, int numWords);
void printGradeLevel(int gradeLevel);

int main(int argc, string argv[])
{

    string text = get_string("Text: ");

    int numLetters = getNumLetters(text);
    int numSentences = getNumSentences(text);
    int numWords = getNumWords(text);

    int gradeLevel = getGradeLevel(numLetters, numSentences, numWords);

    printGradeLevel(gradeLevel);


}

int getNumLetters(string text)
{
    int numLetters = 0;

    for (int i = 0; i < strlen(&text[i]); i++)
    {
        if (isalpha(text[i]))
        {
            numLetters += 1;
        }
    }
    return numLetters;
}


int getNumSentences(string text){

    int numSentences = 0;

    for(int i = 0; i < strlen(&text[i]); i++){
        if(text[i] == '.'  text[i] == '?'  text[i] == '!'){
            numSentences += 1;
        }
    }
    return numSentences;
}


int getNumWords(string text){

    int numWords = 0;

    for(int i = 0; i < strlen(&text[i]); i++){
        if (text[i] == ' '){
            numWords += 1;
        }
    }
        return numWords + 1;
}

int getGradeLevel(int numLetters, int numSentences, int numWords){

    float S = (numSentences / (float)numWords) * 100;

    float L = (numLetters / (float)numWords) * 100;

    return round(0.0588 * L - 0.296 * S - 15.8);
}

void printGradeLevel(int gradeLevel){

    if (gradeLevel <= 1){
        printf("Before grade 1\n");
    }
    else if(gradeLevel >= 16){
        printf("Grade 16+\n");
    }
    else {
        printf("%i\n", gradeLevel);
    }
}