task.py

import sys
import json
import os
from datetime import datetime


TASKS_FILE='tasks.json'

def load_tasks():
    if not os.path.exists(TASKS_FILE):
        return []
    with open(TASKS_FILE,'r') as f:
        return json.load(f)
        
def save_tasks(tasks):
    with open(TASKS_FILE,'w') as f:
        json.dump(tasks,f,indent=4)

def add_tasks(description):
    tasks=load_tasks()
    task_id=tasks[-1]['id']+1 if tasks else 1
    now=datetime.now().isoformat()
    task={
        'id':task_id,
        'description':description,
         'status':'todo',
         'createdAt':now,
         'updatedAt':now
         }
    tasks.append(task)
    save_tasks(tasks)
    print(f'Task addded succesfully (ID:{task_id})')
    
def list_tasks(status=None):
    tasks=load_tasks()
    if status:
        tasks=[task for task in tasks if task['status']==status]
    if not tasks:
        print('no tasks found')
        return
    for task in tasks:
        print(f"id:{task['id']},description:{task['description']},status:{task['status']},createdAt:{task['createdAt']},updatedAt:{task['updatedAt']}")
        
        
        
        

def  mark_task_done(task_id):
    tasks=load_tasks()
    found=False
    for task in tasks:
        if task['id']==task_id:
            task['status']='mark-done'
            task['updatedAt']=datetime.now().isoformat()
            found=True
            break
        
        
        
    if found:
            save_tasks(tasks)
            print(f'Task ID {task_id} marked as done')
    else:
            print(f'Task ID {task_id} not found')



def  delete_task(task_id):
    tasks=load_tasks()
    new_tasks=[task for task in tasks if task['id']!=task_id ]
    if len(new_tasks)==len(tasks):
        print(f'task id  {task_id} not found')
    else:
        save_tasks(new_tasks)
        print(f'task id {task_id } deleted succesfullly')
        
def search_tasks(keyword):
    tasks=load_tasks()
    found=[task for task in tasks if keyword.lower() in task['description'].lower()]
    
    if not found:
        print(f'not found for {keyword}')
    else:
        for task in found:
            print(f"id:{task['id']},description:{task['description']},status:{task['status']},createdAt:{task['createdAt']},updatedAt:{task['updatedAt']}") 

def update_task(task_id,new_description):
    tasks=load_tasks()
    found=False
    for task in tasks:
        if task['id']==task_id:
            task['description']=new_description
            task['updatedAt']=datetime.now().isoformat()
            found=True
            break
    if found:
        save_tasks(tasks)
        print(f'task {task_id} updated succesfully')
    else:
        print(f'task id {task_id} not found')

def mark_task_in_progress(task_id):
    tasks=load_tasks()
    found=False
    for task in tasks:
        if task['id']==task_id:
            task['status']='in progress'
            task['updatedAt']=datetime.now().isoformat()
            found=True
            break
    
    if found:
        save_tasks(tasks)
        print(f'task id {task_id} marked as in progress')
    else:
        print(f'task id {task_id } not  found')        
        

if __name__== '__main__':
    args=sys.argv
    if len(args)<2 :
        print('usage: command [arguments]')
    elif args[1]=='add':
      if len(args)<3:
        print('usage: python3 task.py add your description')
      else:
          description=' '.join(args[2:])
          add_tasks(description)
    elif args[1]=='mark-done':
        if len(args)<3:
           print('usage:python3 task.py mark-done task_id')
        else:
            try:
                task_id=int(args[2])
                mark_task_done(task_id)
            except ValueError:
                print('task id must be  a number')
    elif args[1]=='delete':
        if len(args)<3:
            print('usage:python3 task.py delete task_id')
        else:
            try:
                task_id=int(args[2])
                delete_task(task_id)
            except ValueError:
                print('task id must be a number')
    elif args[1]=='search':
        if len(args)<3:
            print('usage:python3 task.py search keyword')
        else:
         search_tasks(args[2])
    elif args[1]=='update':
        if len(args)<4:
            print('usage:python3 task.py update task_id description')
            
        else:
            try:
                task_id=int(args[2])
                new_description=' '.join(args[3:])
                update_task(task_id,new_description)
            except ValueError:
                print('task id must be a number')
    elif args[1]=='mark-in-progress':
        if len(args)<3:
            print('usage: python3 task.py mark-in-progress task_id')
        else:
            try:
                task_id=int(args[2])
                mark_task_in_progress(task_id)
            except ValueError:
                print('task id must be a number')
          
    elif args[1]=='list':
        if len(args)>=3:
            status = ' '.join(args[2:]).lower()

            if status in ['todo','mark-done','mark-in-progress']:
                list_tasks(status)
            else:
                print('invlaid key.use todo mark-done or mark-in-progress')
        else:
          list_tasks()
    
    else:
        print(f'unknown command {args[1]}')