"""
  Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.

  Permission is hereby granted, free of charge, to any person obtaining a copy of this
  software and associated documentation files (the "Software"), to deal in the Software
  without restriction, including without limitation the rights to use, copy, modify,
  merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""
import os
import cfnlint
from cfnlint.rules import CloudFormationLintRule  # pylint: disable=E0401
from cfnlint.rules import RuleMatch
from qs_cfn_lint_rules.stack.StackHelper import template_url_to_path


class DefaultParameter(CloudFormationLintRule):
    """Check Nested Stack Parameters"""

    id = "W9901"
    experimental = True
    shortdesc = "Parameters missing for nested stack"
    description = "Check to make sure parameters for nested stack are correct"
    source_url = "https://github.com/qs-cfn-lint-rules/qs_cfn_lint_rules"
    tags = ["case"]

    @staticmethod
    def default_parameter_check(
        current_template_path, parameters, child_template_url, mappings
    ):
        missing_parameters = []

        # Hack out the QS bits and get the file_name
        template_file = template_url_to_path(
            current_template_path=current_template_path,
            template_url=child_template_url,
            template_mappings=mappings,
        )
        if isinstance(template_file, list) and len(template_file) == 1:
            template_file = template_file[0]
        elif isinstance(template_file, list):
            raise ValueError(
                "expecting single template in a list %s" % template_file
            )

        # Load child stack
        # template_parser = MyTemplateParser()
        # template_parsed = template_parser.my_load_yaml_function(
        #     template_file=template_file
        # )
        template_parsed = cfnlint.decode.cfn_yaml.load(template_file)

        # Iterate over Child Stack parameters and
        # make sure we have all the ones that are not Defaults
        # TODO: How should we deal with 'Defaults'
        child_template_parameters = template_parsed.get("Parameters")
        if child_template_parameters is None:
            child_template_parameters = {}

        for parameter in child_template_parameters:
            properties = child_template_parameters.get(parameter)
            if ("Default" in properties.keys()) and (
                parameter not in parameters.keys()
            ):
                missing_parameters.append(parameter)

            # TODO: Add matching of types if known
            # TODO: What about TaskCat parameters
        if not len(missing_parameters) == 0:
            return str(missing_parameters)
        else:
            return None

    def match(self, cfn):
        """Basic Matching"""
        matches = []
        # try:
        resources = cfn.get_resources(
            resource_type=["AWS::CloudFormation::Stack"]
        )

        for r_name, r_values in resources.items():
            properties = r_values.get("Properties")
            child_template_url = properties.get("TemplateURL")

            child_template_parameters = properties.get("Parameters")
            if child_template_parameters is None:
                child_template_parameters = {}

            default_parameters = self.default_parameter_check(
                current_template_path=os.path.abspath(cfn.filename),
                parameters=child_template_parameters,
                child_template_url=child_template_url,
                mappings=cfn.get_mappings(),
            )

            if default_parameters:
                path = ["Resources", r_name, "Properties", "Parameters"]
                message = (
                    "Default parameters used,"
                    " please be explicit and pass the default value "
                    "if you wish to use that. {} {}".format(
                        r_name, default_parameters
                    )
                )
                matches.append(RuleMatch(path, message))
        return matches