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

// Function declarations
void displayMenu();
char** readFromFile(const char* filename, int* wordCount);
void processWords(char** words, int wordCount, char** sortedWords[4], int sortedCount[4]);
void writeToFile(const char* filename, char** sortedWords[4], int sortedCount[4]);

int main() {
    int choice;
    char inputFile[100], outputFile[100];
    int wordCount = 0;
    char **words = NULL;
    char *sortedWords[4][100];
    int sortedCount[4] = {0};

    displayMenu();
    printf("Choose an option (1 to execute or 0 to exit): ");
    scanf("%d", &choice);

    if (choice == 1) {
        // Input the names of input and output files
        printf("Enter the name of the input file: ");
        scanf("%s", inputFile);
        printf("Enter the name of the output file: ");
        scanf("%s", outputFile);

        // Reading from the file
        words = readFromFile(inputFile, &wordCount);

        if (words != NULL) {
            // Processing the data
            processWords(words, wordCount, sortedWords, sortedCount);

            // Writing the result to an output file
            writeToFile(outputFile, sortedWords, sortedCount);

            // Freeing dynamically allocated memory
            for (int i = 0; i < wordCount; i++) {
                free(words[i]);
            }
            free(words);
        }
    }

    return 0;
}

// Function to display the menu
void displayMenu() {
    printf("===== Menu =====\n");
    printf("1. Read words from file\n");
    printf("2. Sort words by first letter (A, B, C, D)\n");
    printf("3. Write result to file\n");
    printf("0. Exit\n");
    printf("================\n");
}

// Function to read words from input file
char** readFromFile(const char* filename, int* wordCount) {
    FILE *file = fopen(filename, "r");
    if (file == NULL) {
        printf("Error opening the file.\n");
        return NULL;
    }

    char buffer[100];
    char **words = NULL;
    *wordCount = 0;

    // Read words from the file
    while (fscanf(file, "%s", buffer) != EOF) {
        words = (char**) realloc(words, (*wordCount + 1) * sizeof(char*));
        words[*wordCount] = (char*) malloc((strlen(buffer) + 1) * sizeof(char));
        strcpy(words[*wordCount], buffer);
        (*wordCount)++;
    }

    fclose(file);
    return words;
}

// Function to process words and sort them by their first letter
void processWords(char** words, int wordCount, char** sortedWords[4], int sortedCount[4]) {
    for (int i = 0; i < wordCount; i++) {
        char firstLetter = toupper(words[i][0]);

        if (firstLetter == 'A') {
            sortedWords[0][sortedCount[0]++] = words[i];
        } else if (firstLetter == 'B') {
            sortedWords[1][sortedCount[1]++] = words[i];
        } else if (firstLetter == 'C') {
            sortedWords[2][sortedCount[2]++] = words[i];
        } else if (firstLetter == 'D') {
            sortedWords[3][sortedCount[3]++] = words[i];
        }
    }
}

// Function to write sorted words into output file
void writeToFile(const char* filename, char** sortedWords[4], int sortedCount[4]) {
    FILE *file = fopen(filename, "w");
    if (file == NULL) {
        printf("Error opening the output file.\n");
        return;
    }

    // Writing words starting with 'A'
    fprintf(file, "Words starting with A:\n");
    for (int i = 0; i < sortedCount[0]; i++) {
        fprintf(file, "%s\n", sortedWords[0][i]);
    }

    // Writing words starting with 'B'
    fprintf(file, "\nWords starting with B:\n");
    for (int i = 0; i < sortedCount[1]; i++) {
        fprintf(file, "%s\n", sortedWords[1][i]);
    }

    // Writing words starting with 'C'
    fprintf(file, "\nWords starting with C:\n");
    for (int i = 0; i < sortedCount[2]; i++) {
        fprintf(file, "%s\n", sortedWords[2][i]);
    }

    // Writing words starting with 'D'
    fprintf(file, "\nWords starting with D:\n");
    for (int i = 0; i < sortedCount[3]; i++) {
        fprintf(file, "%s\n", sortedWords[3][i]);
    }

    fclose(file);
}