"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""

from cfnlint.helpers import LIMITS
from cfnlint.rules import CloudFormationLintRule, RuleMatch


class LimitAttributes(CloudFormationLintRule):
    """Check maximum Mapping attribute limit"""

    id = "I7012"
    shortdesc = "Mapping attribute limit"
    description = "Check if the amount of Mapping attributes in the template is approaching the upper limit"
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cloudformation-limits.html"
    tags = ["mappings", "limits"]

    def match(self, cfn):
        matches = []
        for mapping_name, mapping in cfn.template.get("Mappings", {}).items():
            for mapping_attribute_name, mapping_attribute in mapping.items():
                path = ["Mappings", mapping_name, mapping_attribute_name]
                if (
                    LIMITS["threshold"] * LIMITS["Mappings"]["attributes"]
                    < len(mapping_attribute)
                    <= LIMITS["Mappings"]["attributes"]
                ):
                    message = "The amount of mapping attributes ({0}) is approaching the limit ({1})"
                    matches.append(
                        RuleMatch(
                            path,
                            message.format(
                                len(mapping_attribute), LIMITS["Mappings"]["attributes"]
                            ),
                        )
                    )
        return matches
