main.py

import json
import sys
from pathlib import Path
from task import add_task, delete_task, update_task, list_tasks, mark_task, load_tasks, save_tasks

tasks_file = Path(  "tasks.json"  ).is_file()

if not tasks_file:
    with open(  "tasks.json", "w"  ) as file:
        json.dump(  { "tasks":[] }, file, indent = 4  )

if len(sys.argv) > 1:
    tasks_json = load_tasks( "tasks.json" )
    tasks = tasks_json[ "tasks" ]
    command = sys.argv[ 1 ]
    id_commands = { "del", "mark-in-progress", "mark-done", "update" }

    if command in id_commands and len(  sys.argv  ) > 2:
        try:
            task_id = int(  sys.argv[ 2 ]  )
        except ValueError:
            print(  "The ID MUST be a number!"  )
            quit()

    if command == "del":
        if len(  sys.argv  ) > 2:
            task_desc = sys.argv[ 2 ]
            delete_task(  task_id, tasks  )
        else:
            print(  "Please enter a task id to delete after the del command."  )

    if command == "add":
        if len(  sys.argv  ) > 2:
            task_desc = sys.argv[ 2 ]
            add_task(  task_desc, tasks  )
        else:
            print(  "Please enter a description enclosed in double quotation marks after the task id."  )

    if command == "update":
        if len(  sys.argv  ) > 2:
            task_desc = sys.argv[ 3 ]
            update_task(  task_id, tasks, task_desc  )
        else:
            print(  "Please enter a task id to update after the update command."  )

    if command == "list":
        if len(  sys.argv  ) > 2:
            sorting = sys.argv[ 2 ]
            list_tasks(  tasks_json, sorting  )
        else:
            list_tasks(  tasks_json  )

    if command == "mark-in-progress":
        if len(  sys.argv  ) > 2:
            mark_task(  task_id, tasks, "in-progress"  )
        else:
            print(  "Please enter a task id to mark after the mark-in-progress command."  )

    if command == "mark-done":
        if len(  sys.argv  ) > 2:
            mark_task(  task_id, tasks, "done"  )
        else:
            print(  "Please enter a task id to mark after the mark-done command."  )

    save_tasks(  "tasks.json", tasks_json  )
else:
    print(  "Please enter an argument when using the program."  )