"""block_service.py — Logique métier du tableau de bord (widgets)."""

from models import block_model


def list_blocks(db):
    return block_model.fetch_all(db)


def add_block(db, block_type, column, data):
    if block_type not in {"iframe", "buttons", "html"}:
        raise ValueError(f"Type de bloc inconnu : {block_type}")
    if column not in {"left", "center", "right"}:
        raise ValueError(f"Colonne inconnue : {column}")
    return block_model.insert(db, block_type, column, data)


def save_layout(db, layout):
    """layout : liste de {id, column, position} après un drag & drop."""
    for item in layout:
        block_model.update_position(db, item["id"], item["column"], item["position"])


def delete_block(db, block_id):
    return block_model.delete(db, block_id)