20240106

import json
import os
from datetime import datetime

def load_tasks():
    try:
        with open("tasks.json", "r") as file:
            tasks = json.load(file)
    except FileNotFoundError:
        tasks = []
    return tasks

def save_tasks(tasks):
    with open("tasks.json", "w") as file:
        json.dump(tasks, file)

def display_tasks(tasks):
    if not tasks:
        print("No tasks found.")
        return

    print("Tasks:")
    for index, task in enumerate(tasks, start=1):
        status = " [Done]" if task["done"] else " [Pending]"
        print(f"{index}. {task['description']} ({task['due_date']}){status}")

def add_task(tasks):
    description = input("Enter task description: ")
    due_date_str = input("Enter due date (YYYY-MM-DD): ")

    try:
        due_date = datetime.strptime(due_date_str, "%Y-%m-%d").strftime("%Y-%m-%d")
    except ValueError:
        print("Invalid date format. Please use YYYY-MM-DD.")
        return

    new_task = {"description": description, "due_date": due_date, "done": False}
    tasks.append(new_task)
    print("Task added successfully.")

def complete_task(tasks):
    display_tasks(tasks)
    try:
        index = int(input("Enter the task number to mark as done: ")) - 1
        tasks[index]["done"] = True
        print("Task marked as done.")
    except (ValueError, IndexError):
        print("Invalid task number.")

if __name__ == "__main__":
    tasks = load_tasks()

    while True:
        print("\nTask Manager Menu:")
        print("1. Display Tasks")
        print("2. Add Task")
        print("3. Complete Task")
        print("4. Exit")

        choice = input("Enter your choice (1-4): ")

        if choice == "1":
            display_tasks(tasks)
        elif choice == "2":
            add_task(tasks)
        elif choice == "3":
            complete_task(tasks)
        elif choice == "4":
            save_tasks(tasks)
            print("Exiting Task Manager. Your tasks have been saved.")
            break
        else:
            print("Invalid choice. Please enter a number between 1 and 4.")