"""
Modelverse operations used by the UI
"""

import sys
sys.path.append("..")
import wrappers.modelverse as mv
import commons
from sketchUI.graphics_node_item import IconType


def get_available_types():
    """ Returns a list of all types of nodes in all example models """
    types = []
    for m in commons.all_example_models():
        nodes = mv.all_instances(m, "Node")
        for node in nodes:
            typ = commons.get_node_type(m, node)
            types.append(typ)
    return list(set(types))

def is_edge_supported(from_type, to_type):
    """
    True if an association between from_type and to_type exists in any example model
    False otherwise
    """
    for m in commons.all_example_models():
        nodes_from = commons.all_nodes_with_type(m, from_type)
        nodes_to = commons.all_nodes_with_type(m, to_type)
        for nf in nodes_from:
            for nt in nodes_to:
                assocs = commons.get_associations_between(m, nf, nt)
                if assocs:
                    # somewhere in an example model, there is such an association
                    return True
    return False

def add_node(model, node_type):
    """ Adds new node to model "model" with type attribute "node_type" """
    node_id = mv.instantiate(model, "Node")
    mv.attr_assign(model, node_id, "typeID", node_type)
    return node_id

def add_edge(model, from_id, to_id, directed=False):
    """ Adds an edge to model "model" between the nodes "from_id" and "to_id" """
    edge_id = mv.instantiate(model, "Edge", (from_id, to_id))
    mv.attr_assign(model, edge_id, "directed", directed)
    return edge_id

def delete_node(model, node_id):
    mv.delete_element(model, node_id)

def get_consyn_of(node_type):
    """
    Queries the modelverse for a concrete syntax of elements of type "node_type".
    Returns the list of model elements by mv.element_list_nice or an empty list if no
    concrete syntax exists.
    """
    for csm in commons.all_consyn_models():
        if csm.split("/")[-1] == node_type:
            return mv.element_list_nice(csm)
    return []

def new_concrete_syntax(type_id, icon_type):
    # type: (str, IconType) -> str
    """
    Add a new concrete syntax model for type "type_id" and representation type "icon_type" to the modelverse
    """
    csm = "models/consyn/" + type_id
    try:
        mv.model_add(csm, "formalisms/consynMM")
    except mv.ModelExists:
        return ""

    icon = mv.instantiate(csm, "Icon")
    if icon_type == IconType.PRIMITIVE:
        mv.attr_assign(csm, icon, "is_primitive", True)
        mv.instantiate(csm, "PrimitiveGroup")
    else:
        mv.attr_assign(csm, icon, "is_primitive", False)

    return csm