import re
from wrappers import modelverse as mv


def all_models():
    """ Returns a list of paths of all example- and instance models """
    return all_instance_models() + all_example_models()

def all_instance_models():
    """ Returns a list of paths of all instance models """
    try:
        instance_models = mv.model_list("models/instance")
    except mv.UnknownLocation:
        # no instance models
        return []
    instance_models_full = ["models/instance/"+m for m in instance_models]
    return instance_models_full

def all_example_models():
    """ Returns a list of paths of all example models """
    example_models = mv.model_list("models/example")
    example_models_full = ["models/example/"+exm for exm in example_models]
    return example_models_full

def all_nodes_with_type(model, typ):
    """ Returns a list of nodes in model model with type typ """
    all_nodes = mv.all_instances(model, "Node")
    ret = [node for node in all_nodes if mv.read_attrs(model, node)["typeID"] == typ]
    return ret

def get_node_type(model, node):
    """ Returns the type attribute of node in model as string"""
    return mv.read_attrs(model, node)["typeID"]

def get_associations_between(model, node1, node2):
    """ Returns a list of association IDs between the nodes node1 and node2 """
    edges_n1 = mv.read_outgoing(model, node1, "Edge")
    edges_n1.update(mv.read_incoming(model, node1, "Edge"))
    edges_n2 = mv.read_outgoing(model, node2, "Edge")
    edges_n2.update(mv.read_incoming(model, node2, "Edge"))
    return list(edges_n1.intersection(edges_n2))

def new_instance_model():
    """
    Adds a new, empty instance model to the Modelverse.
    Returns the name of the new model
    """
    existing_models = all_instance_models()
    idx = 1
    nums = []
    for model in existing_models:
        m = model.split("/")[-1]
        try:
            idx = int(re.search(r'\d+', m).group())
            nums.append(idx)
        except AttributeError:
            pass
    if nums:
        idx = sorted(nums)[-1] + 1
    im = "models/instance/im{}".format(idx)
    print("Adding new instance model {}".format(im))
    mv.model_add(im, "formalisms/graphMM")
    mid = mv.instantiate(im, "Model")
    mv.attr_assign(im, mid, "is_example", False)
    mv.attr_assign(im, mid, "descr", "")
    return im

def new_example_model():
    """
    Adds a new, empty example model to the Modelverse.
    Returns the name of the new model
    """
    existing_models = all_example_models()
    idx = 1
    nums = []
    for model in existing_models:
        m = model.split("/")[-1]
        try:
            idx = int(re.search(r'\d+', m).group())
            nums.append(idx)
        except AttributeError:
            pass
    if nums:
        idx = sorted(nums)[-1] + 1
    exm = "models/instance/ex{}".format(idx)
    print("Adding new example model {}".format(exm))
    mv.model_add(exm, "formalisms/graphMM")
    mid = mv.instantiate(exm, "Model")
    mv.attr_assign(exm, mid, "is_example", True)
    mv.attr_assign(exm, mid, "descr", "")
    return exm