# -*- coding: utf8 -*-
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# org.onap.vvp/validation-scripts
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import os

from tests.helpers import validates, traverse, load_yaml


def is_get_param(arg):
    return isinstance(arg, dict) and "get_param" in arg


class GetParamChecker:
    def __init__(self, yaml_file):
        self.errors = []
        self.filename = os.path.basename(yaml_file)

    def __call__(self, keys, param_value, *args, **kwargs):
        if isinstance(param_value, str):
            return  # refers to a string or parameter - this is OK
        if isinstance(param_value, list):
            nested_get_params = (arg for arg in param_value if is_get_param(arg))
            args = (call["get_param"] for call in nested_get_params)
            invalid_args = (arg for arg in args if not isinstance(arg, str))
            # We don't check if the args really point to parameters, because that
            # check is already covered by test_05_all_get_param_have_defined_parameter
            # in test_initial_configuration.py
            if any(invalid_args):
                self.errors.append(
                    (
                        "Invalid nesting of get_param detected in {} at {}. Calls to "
                        "get_param can only be nested two deep, and the argument to "
                        "the second get_param must only be a parameter name: {}"
                    ).format(
                        self.filename, " > ".join(keys), {"get_param": param_value}
                    )
                )


@validates("R-10834")
def test_nested_parameter_args(yaml_file):
    heat = load_yaml(yaml_file)
    checker = GetParamChecker(yaml_file)
    traverse(heat, "get_param", checker)
    assert not checker.errors, ". ".join(checker.errors)