"""Shared ordering operations for task columns and rows."""

from tasks.models import Task


def normalize_column_positions(column, row=None) -> None:
    tasks = list(
        column.tasks.filter(row=row)
        .order_by("position", "-created_at", "id")
        .only("id", "position")
    )
    changed_tasks = []
    for index, task in enumerate(tasks):
        position = (index + 1) * 1000
        if task.position == position:
            continue
        task.position = position
        changed_tasks.append(task)
    if changed_tasks:
        Task.objects.bulk_update(changed_tasks, ["position"], batch_size=500)