from rest_framework.exceptions import ValidationError
from apps.clients.models import Client
from apps.workspaces.models import WorkspaceMembership


def create_client(user, workspace_id, name, notes="", thumbnail=None):
    """
    Creates a new client after validating workspace membership and name uniqueness.
    """
    is_workspace_member = WorkspaceMembership.objects.filter(
        workspace_id=workspace_id,
        user=user,
        is_active=True
    ).exists()
    
    if not is_workspace_member:
        raise ValidationError({"workspace": "شما عضو این فضای کاری نیستید."})

    if Client.objects.filter(workspace_id=workspace_id, name=name, is_deleted=False).exists():
        raise ValidationError({"name": "مشتری با این نام در این فضای کاری وجود دارد."})

    return Client.objects.create(
        workspace_id=workspace_id,
        name=name,
        notes=notes,
        thumbnail=thumbnail,
        created_by=user,
        updated_by=user,
    )


def update_client(client, name=None, notes=None, thumbnail=None, clear_thumbnail=False):
    """
    Updates an existing client while validating name uniqueness within the workspace.
    """
    if name is not None and name != client.name:
        if Client.objects.filter(workspace_id=client.workspace_id, name=name, is_deleted=False).exists():
            raise ValidationError({"name": "مشتری با این نام در این فضای کاری وجود دارد."})
        client.name = name

    if notes is not None:
        client.notes = notes

    old_thumbnail_name = client.thumbnail.name if client.thumbnail else None
    if clear_thumbnail and client.thumbnail:
        client.thumbnail.delete(save=False)
        client.thumbnail = None

    if thumbnail is not None:
        client.thumbnail = thumbnail

    client.save(update_fields=["name", "notes", "thumbnail", "updated_at"])
    if old_thumbnail_name and client.thumbnail and client.thumbnail.name != old_thumbnail_name:
        storage = client.thumbnail.storage
        if storage.exists(old_thumbnail_name):
            storage.delete(old_thumbnail_name)
    return client