from apps.projects.models import ProjectRate, ProjectUserRate

def create_project_rate(project, hourly_rate, currency="USD"):
    return ProjectRate.objects.create(
        project=project,
        hourly_rate=hourly_rate,
        currency=currency
    )

def update_project_rate(rate_instance, **kwargs):
    update_fields = []
    for field, value in kwargs.items():
        if hasattr(rate_instance, field) and getattr(rate_instance, field) != value:
            setattr(rate_instance, field, value)
            update_fields.append(field)
            
    if update_fields:
        update_fields.append("updated_at")
        rate_instance.save(update_fields=update_fields)
        
    return rate_instance

def create_project_user_rate(project, user_id, hourly_rate, currency="USD"):
    return ProjectUserRate.objects.create(
        project=project,
        user_id=user_id,
        hourly_rate=hourly_rate,
        currency=currency
    )

def update_project_user_rate(user_rate_instance, **kwargs):
    update_fields = []
    for field, value in kwargs.items():
        if hasattr(user_rate_instance, field) and getattr(user_rate_instance, field) != value:
            setattr(user_rate_instance, field, value)
            update_fields.append(field)
            
    if update_fields:
        update_fields.append("updated_at")
        user_rate_instance.save(update_fields=update_fields)
        
    return user_rate_instance