# Copyright The IETF Trust 2016-2023, All Rights Reserved
# -*- coding: utf-8 -*-

import itertools

from ietf.doc.factories import WgRfcFactory
from ietf.doc.models import RelatedDocument
from ietf.utils.test_utils import TestCase


class RelatedDocumentTests(TestCase):
    def test_is_downref(self):
        rfcs = [
            WgRfcFactory(std_level_id=lvl)
            for lvl in ["inf", "exp", "bcp", "ps", "ds", "std", "unkn"]
        ]

        result_matrix = {
            # source
            "inf": {
                "inf": None,  # target
                "exp": None,  # target
                "bcp": None,  # target
                "ps": None,  # target
                "ds": None,  # target
                "std": None,  # target
                "unkn": None,  # target
            },
            # source
            "exp": {
                "inf": None,  # target
                "exp": None,  # target
                "bcp": None,  # target
                "ps": None,  # target
                "ds": None,  # target
                "std": None,  # target
                "unkn": None,  # target
            },
            # source
            "bcp": {
                "inf": "Downref",  # target
                "exp": "Downref",  # target
                "bcp": None,  # target
                "ps": None,  # target
                "ds": None,  # target
                "std": None,  # target
                "unkn": "Possible Downref",  # target
            },
            # source
            "ps": {
                "inf": "Downref",  # target
                "exp": "Downref",  # target
                "bcp": None,  # target
                "ps": None,  # target
                "ds": None,  # target
                "std": None,  # target
                "unkn": "Possible Downref",  # target
            },
            # source
            "ds": {
                "inf": "Downref",  # target
                "exp": "Downref",  # target
                "bcp": None,  # target
                "ps": "Downref",  # target
                "ds": None,  # target
                "std": None,  # target
                "unkn": "Possible Downref",  # target
            },
            # source
            "std": {
                "inf": "Downref",  # target
                "exp": "Downref",  # target
                "bcp": None,  # target
                "ps": "Downref",  # target
                "ds": "Downref",  # target
                "std": None,  # target
                "unkn": "Possible Downref",  # target
            },
            # source
            "unkn": {
                "inf": None,  # target
                "exp": None,  # target
                "bcp": None,  # target
                "ps": "Possible Downref",  # target
                "ds": "Possible Downref",  # target
                "std": None,  # target
                "unkn": "Possible Downref",  # target
            },
        }

        for rel in ["refnorm", "refinfo", "refunk", "refold"]:
            for source, target in itertools.product(rfcs, rfcs):
                ref = RelatedDocument.objects.create(
                    source=source,
                    target=target,
                    relationship_id=rel,
                )

                result = ref.is_downref()

                desired_result = (
                    result_matrix[source.std_level_id][target.std_level_id]
                    if ref.relationship.slug in ["refnorm", "refunk"]
                    else None
                )
                if (
                    ref.relationship.slug == "refunk"
                    and desired_result is not None
                    and not desired_result.startswith("Possible")
                ):
                    desired_result = f"Possible {desired_result}"

                self.assertEqual(desired_result, result)