// main.c
// Angela Finlayson 
// Uses the email management system to allow a user to create a folder
// and and emails (with not content) to it.
// Only works for 1 folder... 
// (Provided)

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

#include "email_management_system.h"

void print_instructions(void);
void handle_search(struct folder *current_folder);
void handle_add_email(struct folder *current_folder);
void trim_newline(char str[]);

int main(void) {
    struct folder *current_folder = create_folder("inbox");
    char command;

    print_instructions();
    printf("\nEnter command: ");
    while (scanf(" %c", &command) == 1 && command != 'q') {
        if (command == 'a') {
            handle_add_email(current_folder);
        } else if (command == 'p') {
            print_emails(current_folder);
        } else if (command == 'n') { 
            printf("Number of emails: %d\n", count_emails(current_folder));
        } else if (command == 's') {
            handle_search(current_folder);
        } else {
            printf("Unknown command. Try again.\n");
        }
        printf("\nEnter command: ");
    }
    printf("Exiting\n");
    clear_folder(current_folder);
    return 0;
}

// Prints instructions to users
void print_instructions(void) {
    printf("Email Manager - Command Interface\n");
    printf("Commands:\n");
    printf("a - Add a new email to the folder\n");
    printf("p - Print all emails in the folder\n");
    printf("n - Count emails in the folder\n");
    printf("s - Search for an email by subject\n");
    printf("q - Quit\n");
}

// Handles adding a new email to the folder
// Assumes no error checking needed
void handle_add_email(struct folder *current_folder) {
    char sender[MAX_LEN] = "";
    char subject[MAX_LEN]= "";
    double size;
    int priority, type;

    // Remove whitespace from buffer
    int whitespace_ch;
    while ((whitespace_ch = getchar()) != '\n' && whitespace_ch != EOF) {}

    printf("Enter sender: ");
    fgets(sender, MAX_LEN, stdin);
    trim_newline(sender);
    printf("Enter subject: ");
    fgets(subject, MAX_LEN, stdin);
    trim_newline(subject);
    printf("Enter size (in MB): ");
    scanf("%lf", &size);
    printf("Enter email type (0 for DRAFT, 1 for RECEIVED, 2 for SENT): ");
    scanf("%d", &type);
    printf("Enter priority (0 for LOW, 1 for NORMAL, 3 for HIGH): ");
    scanf("%d", &priority);
    insert_email_at_head(current_folder, sender, subject, size, type, priority);
    printf("Email added to folder '%s'.\n", current_folder->name);
}

// Handles searching for an email by subject in the folder
void handle_search(struct folder *current_folder) {
    char subject[MAX_LEN];
    
    // Remove whitespace from buffer
    int whitespace_ch;
    while ((whitespace_ch = getchar()) != '\n' && whitespace_ch != EOF) {}

    printf("Enter subject to search: ");
    fgets(subject, MAX_LEN, stdin);
    trim_newline(subject);
    
    struct email *found_email = search_email(current_folder, subject);
    if (found_email != NULL) {
        printf("Email found:\n");
        print_single_email(found_email);
    } else {
        printf("No email with subject '%s' found.\n", subject);
    }
}

// removes trailing newline character
void trim_newline(char str[]) {
    int len = strlen(str);
    if (len > 0 && str[len - 1] == '\n') {
        str[len - 1] = '\0';  
    }
}