# -*- coding: utf8 -*-
# ============LICENSE_START=======================================================
# org.onap.vvp/validation-scripts
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import re
from tests import cached_yaml as yaml


def get_vm_types_for_resource(resource):
    """
    Get all unique vm_types for a resource
    Notes:
    - Returns set([]) if the resource is not formatted
    properly, the passed resource is not a nova server
    - If more than one vm_type is detected all vm_types will
    be returned
    """
    if not is_nova_server(resource):
        return set()

    key_values = ["name", "flavor", "image"]
    key_value_formats = [
        ["name", "string", re.compile(r"(.+?)_name_\d+")],
        ["name", "comma_delimited_list", re.compile(r"(.+?)_names")],
        ["flavor", "string", re.compile(r"(.+?)_flavor_name")],
        ["image", "string", re.compile(r"(.+?)_image_name")],
    ]

    vm_types = []
    for k2, v2 in resource["properties"].items():
        if not isinstance(v2, dict) or any(
            [k2 not in key_values, "get_param" not in v2]
        ):
            continue
        formats = [v for v in key_value_formats if v[0] == k2]
        for v3 in formats:
            param = v2["get_param"]
            if isinstance(param, list):
                param = param[0]
            m = v3[2].match(param)
            if m and m.group(1):
                vm_types.append(m.group(1))

    return set(vm_types)


def is_nova_server(resource):

    return (
        isinstance(resource, dict)
        and "type" in resource
        and "properties" in resource
        and resource.get("type") == "OS::Nova::Server"
    )


def get_vm_type_for_nova_server(resource):
    """
    Get the vm_type for a resource
    Note: Returns None if not exactly one vm_type
    is detected, if the resource is not formatted properly, or
    the passed resource is not a nova server
    """
    vm_types = get_vm_types_for_resource(resource)

    # if more than one vm_type was identified, return None
    if not vm_types or len(vm_types) > 1:
        return None

    return vm_types.pop()


def get_vm_types(resources):
    """
    Get all vm_types for a list of heat resources, do note that
    some of the values retrieved may be invalid
    """
    vm_types = []
    for v in resources.values():
        vm_types.extend(list(get_vm_types_for_resource(v)))

    return set(vm_types)


def get_all_vm_types(yaml_files):
    """
    Get all vm_types for a list of yaml files
    """
    vm_types = []
    for yaml_file in yaml_files:
        with open(yaml_file, "r") as f:
            yml = yaml.load(f)

        if "resources" not in yml:
            continue

        vm_types.extend(get_vm_types(yml["resources"]))

    return set(vm_types)