main.py

"""
A simple Python task manager CLI application.
"""

from datetime import datetime


tasks = []


def add_task(title: str, priority: str = "medium") -> dict:
    task = {
        "id": len(tasks) + 1,
        "title": title,
        "priority": priority,
        "done": False,
        "created_at": datetime.now().strftime("%Y-%m-%d %H:%M"),
    }
    tasks.append(task)
    return task


def list_tasks(show_done: bool = True):
    filtered = tasks if show_done else [t for t in tasks if not t["done"]]
    if not filtered:
        print("No tasks found.")
        return
    print(f"\n{'ID':<4} {'Done':<6} {'Priority':<10} {'Title':<30} {'Created'}")
    print("-" * 65)
    for t in filtered:
        done_mark = "✓" if t["done"] else " "
        print(f"{t['id']:<4} [{done_mark}]   {t['priority']:<10} {t['title']:<30} {t['created_at']}")


def complete_task(task_id: int) -> bool:
    for task in tasks:
        if task["id"] == task_id:
            task["done"] = True
            return True
    return False


def delete_task(task_id: int) -> bool:
    for i, task in enumerate(tasks):
        if task["id"] == task_id:
            tasks.pop(i)
            return True
    return False


def main():
    print("=== Task Manager ===")
    print("Commands: add, list, done, delete, quit\n")

    while True:
        command = input("> ").strip().lower()

        if command == "quit":
            print("Goodbye!")
            break

        elif command == "add":
            title = input("Task title: ").strip()
            if not title:
                print("Title cannot be empty.")
                continue
            priority = input("Priority (low/medium/high) [medium]: ").strip().lower() or "medium"
            if priority not in ("low", "medium", "high"):
                print("Invalid priority. Using 'medium'.")
                priority = "medium"
            task = add_task(title, priority)
            print(f"Added task #{task['id']}: {task['title']}")

        elif command == "list":
            show_done = input("Show completed tasks? (y/n) [y]: ").strip().lower()
            list_tasks(show_done != "n")

        elif command == "done":
            try:
                task_id = int(input("Task ID to mark complete: "))
                if complete_task(task_id):
                    print(f"Task #{task_id} marked as done.")
                else:
                    print(f"Task #{task_id} not found.")
            except ValueError:
                print("Please enter a valid number.")

        elif command == "delete":
            try:
                task_id = int(input("Task ID to delete: "))
                if delete_task(task_id):
                    print(f"Task #{task_id} deleted.")
                else:
                    print(f"Task #{task_id} not found.")
            except ValueError:
                print("Please enter a valid number.")

        else:
            print("Unknown command. Try: add, list, done, delete, quit")


if __name__ == "__main__":
    main()