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# org.onap.vvp/validation-scripts
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"""
test nesting level
0 -> 1 -> 2 -> too many levels.
"""

import pytest

from .utils import nested_files
from .helpers import validates

VERSION = "1.0.0"


def get_nova_server_count(heat):
    """return the number of OS::Nova::Server
    resources in heat
    """
    return len(heat.get_resource_by_type("OS::Nova::Server"))


# pylint: disable=invalid-name


@validates("R-17528")
def test_nesting_nova_server(yaml_files):
    """
    A VNF's Heat Orchestration Template's first level Nested YAML file
    **MUST NOT** contain more than one ``OS::Nova::Server`` resource.
    A VNF's Heat Orchestration Template's second level Nested YAML file
    **MUST NOT** contain an ``OS::Nova::Server`` resource.

    level: 0    1         2         3
    template -> nested -> nested -> too many levels
    """
    bad, __, heat, depths = nested_files.get_nesting(yaml_files)
    if bad:
        pytest.skip("nesting depth exceeded")
    for parent, depth in depths.items():
        for depth_tuple in depth:
            depth, context = depth_tuple
            if depth > 1:
                fname = context[0]
                nservers = get_nova_server_count(heat[fname])
                if nservers > 1:
                    bad.append(
                        "nested template %s must have only have 1 "
                        "OS::Nova::Server defined, but %s were found"
                        % (fname, nservers)
                    )
            if depth > 2:
                fname = context[1]
                nservers = get_nova_server_count(heat[fname])
                if nservers > 0:
                    bad.append(
                        "nested template %s must not have an "
                        "OS::Nova::Server defined, but %s were found"
                        % (fname, nservers)
                    )
    assert not bad, "; ".join(bad)