import pytest

from core.builtin_concepts import BuiltinConcepts
from core.concept import Concept
from core.global_symbols import EVENT_CONCEPT_PRECEDENCE_MODIFIED, CONCEPT_COMPARISON_CONTEXT, \
    EVENT_RULE_PRECEDENCE_MODIFIED, RULE_COMPARISON_CONTEXT
from core.sheerka.services.SheerkaComparisonManager import SheerkaComparisonManager, ComparisonObj
from core.sheerka.services.SheerkaConceptManager import ChickenAndEggError
from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka


class TestSheerkaGreaterThanManager(TestUsingMemoryBasedSheerka):

    @staticmethod
    def get_comparison_objs(lst, prop_name="prop_name", context="#"):
        for item in lst:
            if ">>" in item:
                a = item.split(">>")[0]
                yield ComparisonObj("id", prop_name, a.strip(), None, ">>", context)
            elif "<<" in item:
                a = item.split("<<")[0]
                yield ComparisonObj("id", prop_name, a.strip(), None, "<<", context)
            elif ">" in item:
                a, b = item.split(">")
                yield ComparisonObj("id", prop_name, a.strip(), b.strip(), ">", context)
            elif "<" in item:
                a, b = item.split("<")
                yield ComparisonObj("id", prop_name, a.strip(), b.strip(), "<", context)
            else:
                a, b = item.split("=")
                yield ComparisonObj("id", prop_name, a.strip(), b.strip(), "=", context)

    @staticmethod
    def execution_definition(context, service, concepts_map, definition):
        if ">>" in definition:
            a = concepts_map[definition.split(">>")[0].strip()]
            return service.set_is_greatest(context, "prop_name", a)
        if "<<" in definition:
            a = concepts_map[definition.split("<<")[0].strip()]
            return service.set_is_lesser(context, "prop_name", a)
        if ">" in definition:
            a, b = [concepts_map[e.strip()] for e in definition.split(">")]
            return service.set_is_greater_than(context, "prop_name", a, b)
        if "<" in definition:
            a, b = [concepts_map[e.strip()] for e in definition.split("<")]
            return service.set_is_less_than(context, "prop_name", a, b)

    def test_i_can_add_a_is_greater_than(self):
        sheerka, context, one, two = self.init_concepts("one", "two", cache_only=False)
        service = sheerka.services[SheerkaComparisonManager.NAME]

        res = service.set_is_greater_than(context, "prop_name", two, one)
        assert res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.SUCCESS)

        in_cache = sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_cache == [ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#")]

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2}

        # I can commit
        sheerka.om.commit(context)
        in_db = sheerka.om.current_sdp().get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_db == [ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#")]

    def test_i_can_add_is_greater_than_for_rules(self):
        sheerka, context, r1, r2 = self.init_test(cache_only=False).with_format_rules(("True", "true"),
                                                                                      ("False", "false"),
                                                                                      compile_rule=False).unpack()

        service = sheerka.services[SheerkaComparisonManager.NAME]

        res = service.set_is_greater_than(context, "prop_name", r2, r1)
        assert res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.SUCCESS)

        in_cache = sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_cache == [ComparisonObj(context.event.get_digest(), "prop_name", r2.str_id, r1.str_id, ">", "#")]

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {r1.str_id: 1, r2.str_id: 2}

        # I can commit
        sheerka.om.commit(context)
        in_db = sheerka.om.current_sdp().get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_db == [ComparisonObj(context.event.get_digest(), "prop_name", r2.str_id, r1.str_id, ">", "#")]

    def test_i_can_add_a_is_less_than(self):
        sheerka, context, one, two = self.init_concepts("one", "two", cache_only=False)
        service = sheerka.services[SheerkaComparisonManager.NAME]

        res = service.set_is_less_than(context, "prop_name", one, two)
        assert res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.SUCCESS)

        in_cache = sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_cache == [ComparisonObj(context.event.get_digest(), "prop_name", one.str_id, two.str_id, "<", "#")]

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2}

        # I can commit
        sheerka.om.commit(context)
        in_db = sheerka.om.current_sdp().get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_db == [ComparisonObj(context.event.get_digest(), "prop_name", one.str_id, two.str_id, "<", "#")]

    def test_i_can_add_is_less_than_for_rules(self):
        sheerka, context, r1, r2 = self.init_test(cache_only=False).with_format_rules(("True", "true"),
                                                                                      ("False", "false"),
                                                                                      compile_rule=False,
                                                                                      create_new=True).unpack()

        service = sheerka.services[SheerkaComparisonManager.NAME]

        res = service.set_is_less_than(context, "prop_name", r1, r2)
        assert res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.SUCCESS)

        in_cache = sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_cache == [ComparisonObj(context.event.get_digest(), "prop_name", r1.str_id, r2.str_id, "<", "#")]

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {r1.str_id: 1, r2.str_id: 2}

        # I can commit
        sheerka.om.commit(context)
        in_db = sheerka.om.current_sdp().get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_db == [ComparisonObj(context.event.get_digest(), "prop_name", r1.str_id, r2.str_id, "<", "#")]

    def test_i_can_add_multiples_constraints(self):
        sheerka, context, one, two, three, four = self.init_concepts("one", "two", "three", "four", cache_only=False)
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_greater_than(context, "prop_name", three, two)

        in_cache = sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_cache == [
            ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#"),
            ComparisonObj(context.event.get_digest(), "prop_name", three.str_id, two.str_id, ">", "#")
        ]

        # I can commit
        sheerka.om.commit(context)
        in_db = sheerka.om.current_sdp().get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_db == [
            ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#"),
            ComparisonObj(context.event.get_digest(), "prop_name", three.str_id, two.str_id, ">", "#")
        ]

        sheerka.om.clear(SheerkaComparisonManager.COMPARISON_ENTRY)  # reset the cache

        service.set_is_greater_than(context, "prop_name", four, three)
        in_cache = sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_cache == [
            ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#"),
            ComparisonObj(context.event.get_digest(), "prop_name", three.str_id, two.str_id, ">", "#"),
            ComparisonObj(context.event.get_digest(), "prop_name", four.str_id, three.str_id, ">", "#"),
        ]

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2, "c:three|1003:": 3, "c:four|1004:": 4}

    def test_i_can_add_multiple_constraints_2(self):
        sheerka, context, one, two, three = self.init_concepts("one", "two", "three")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_greater_than(context, "prop_name", three, two)

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2, "c:three|1003:": 3}

        service.set_is_greater_than(context, "prop_name", three, one)  # should not change order
        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2, "c:three|1003:": 3}

    def test_i_can_add_lesser_than_and_opposite_greater_than(self):
        sheerka, context, one, two = self.init_concepts("one", "two")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_less_than(context, "prop_name", one, two)

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2}

    def test_i_can_support_multiple_ontology_layers(self):
        sheerka, context, one, two, three = self.init_concepts("one", "two", "three", cache_only=False)
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)

        # sanity check
        expected_in_cache = [ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#")]
        assert sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#") == expected_in_cache
        expected_weights = {"c:one|1001:": 1, "c:two|1002:": 2}
        assert sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#") == expected_weights

        # I still can access to the previous values
        sheerka.push_ontology(context, "new ontology")
        assert sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#") == expected_in_cache
        assert sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#") == expected_weights

        # I can modify
        service.set_is_greater_than(context, "prop_name", three, two)
        expected_in_cache2 = [
            ComparisonObj(context.event.get_digest(), "prop_name", two.str_id, one.str_id, ">", "#"),
            ComparisonObj(context.event.get_digest(), "prop_name", three.str_id, two.str_id, ">", "#")]
        assert sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#") == expected_in_cache2
        expected_weights2 = {"c:one|1001:": 1, "c:two|1002:": 2, "c:three|1003:": 3}
        assert sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#") == expected_weights2

        # I can retrieve the previous values
        sheerka.pop_ontology(context)
        assert sheerka.om.get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#") == expected_in_cache
        assert sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#") == expected_weights

    @pytest.mark.parametrize("entries, expected", [
        (["two > one"], {'c:one|1001:': 1, 'c:two|1002:': 2}),
        (["one < two"], {'c:one|1001:': 1, 'c:two|1002:': 2}),
        (["three > two", "one < two"], {'c:one|1001:': 1, 'c:two|1002:': 2, 'c:three|1003:': 3}),
        (["three > one", "one < two"], {'c:one|1001:': 1, 'c:two|1002:': 2, 'c:three|1003:': 2}),
        (["three >>"], {'c:three|1003:': 2}),
        (["one <<"], {'c:one|1001:': 0}),
    ])
    def test_i_can_get_concept_weight(self, entries, expected):
        sheerka, context, *concepts = self.init_concepts("one", "two", "three")
        service = sheerka.services[SheerkaComparisonManager.NAME]
        concepts_map = dict(zip(["one", "two", "three"], concepts))

        for entry in entries:
            self.execution_definition(context, service, concepts_map, entry)

        assert service.get_weights("prop_name") == expected

    def test_i_can_get_concept_weight_when_no_comparison_is_defined(self):
        sheerka, context = self.init_concepts()
        service = sheerka.services[SheerkaComparisonManager.NAME]

        assert service.get_weights("prop_name") == {}

    def test_i_can_recover_from_deleted_weight(self):
        sheerka, context, one = self.init_concepts("one")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_lesser(context, "prop_name", one)
        sheerka.om.clear(service.RESOLVED_COMPARISON_ENTRY)

        assert service.get_weights("prop_name") == {"c:one|1001:": 0}

    def test_i_can_get_partition(self):
        sheerka, context, one, two, three = self.init_concepts("one", "two", "three")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_less_than(context, "prop_name", two, three)

        res = service.get_partition("prop_name")

        assert res == {
            1: ["c:one|1001:"],
            2: ["c:two|1002:"],
            3: ["c:three|1003:"],
        }

    def test_i_can_toposort(self):
        # using sample test from https://code.activestate.com/recipes/578272-topological-sort/
        comparison_objs = self.get_comparison_objs([
            "2 < 11",
            "11 > 9",
            "9 < 8",
            "10 < 11",
            "3 > 10",
            "11 < 7",
            "11 < 5",
            "7 > 8",
            "3 > 8"])
        assert list(SheerkaComparisonManager.toposort(comparison_objs)) == [{'2', '9', '10'},
                                                                            {'8', '11'},
                                                                            {'3', '5', '7'}]

    def test_i_can_toposort_when_no_data(self):
        assert list(SheerkaComparisonManager.toposort([])) == []

    def test_i_cannot_toposort_when_cycle(self):
        comparison_objs = self.get_comparison_objs([
            "1 < 2",
            "2 < 3",
            "3 < 1",
            "1 < 4",  # no issue with this
            "2 < 5",  # no issue with this
        ])
        with pytest.raises(ChickenAndEggError) as ex:
            list(SheerkaComparisonManager.toposort(comparison_objs))

        assert ex.value.concepts == {"1", "2", "3"}

    def test_i_can_detect_chicken_and_egg(self):
        sheerka, context, one, two = self.init_concepts("one", "two")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        res = service.set_is_greater_than(context, "prop_name", one, two)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.CHICKEN_AND_EGG)
        assert set(res.body.body) == {one.str_id, two.str_id}

    def test_i_can_detect_more_complex_chicken_and_egg(self):
        sheerka, context, one, two, three, four, five = self.init_concepts("one", "two", "three", "four", "five")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_greater_than(context, "prop_name", five, four)
        service.set_is_greater_than(context, "prop_name", four, three)
        service.set_is_greater_than(context, "prop_name", five, two)

        res = service.set_is_greater_than(context, "prop_name", one, five)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.CHICKEN_AND_EGG)
        assert set(res.body.body) == {one.str_id, two.str_id, five.str_id}

    def test_i_can_give_the_same_information_in_many_ways(self):
        sheerka, context, one, two = self.init_concepts("one", "two")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_less_than(context, "prop_name", one, two)

        weighted = sheerka.om.get(SheerkaComparisonManager.RESOLVED_COMPARISON_ENTRY, "prop_name|#")
        assert weighted == {"c:one|1001:": 1, "c:two|1002:": 2}

    def test_methods_are_correctly_bound(self):
        sheerka, context, one, two = self.init_concepts("one", "two")
        res = sheerka.set_is_greater_than(context, "prop_name", two, one)
        assert res.status

    def test_a_lesser_concept_has_the_lowest_weight(self):
        sheerka, context, one, two, three = self.init_concepts("one", "two", "three", cache_only=False)
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_lesser(context, "prop_name", one)
        assert service.get_weights("prop_name") == {"c:one|1001:": 0}  # DEFAULT_COMPARISON_VALUE - 1

        sheerka.set_is_greater_than(context, "prop_name", three, two)
        assert service.get_weights("prop_name") == {"c:one|1001:": 0, "c:two|1002:": 1, "c:three|1003:": 2}

        # I can commit
        sheerka.om.commit(context)
        in_db = sheerka.om.current_sdp().get(SheerkaComparisonManager.COMPARISON_ENTRY, "prop_name|#")
        assert in_db == [
            ComparisonObj(context.event.get_digest(), "prop_name", one.str_id, None, "<<", "#"),
            ComparisonObj(context.event.get_digest(), "prop_name", three.str_id, two.str_id, ">", "#")
        ]

    def test_i_can_define_an_order_for_lesser_concepts(self):
        sheerka, context, lesser, less_l, even_more_l = self.init_concepts("lesser", "less_l", "even_less_l")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_lesser(context, "prop_name", lesser)
        service.set_is_lesser(context, "prop_name", less_l)
        service.set_is_lesser(context, "prop_name", even_more_l)

        sheerka.set_is_less_than(context, "prop_name", less_l, lesser)
        sheerka.set_is_greater_than(context, "prop_name", less_l, even_more_l)
        assert service.get_weights("prop_name") == {"c:lesser|1001:": 0,
                                                             "c:less_l|1002:": -1,
                                                             "c:even_less_l|1003:": -2}

    def test_i_cannot_define_less_than_a_lesser_if_not_a_lesser_itself(self):
        """
        minus_one cannot be defined as less that one is one is defined as lesser
        unless minus_one is defined as lesser itself
        :return:
        """
        sheerka, context, lesser, foo, bar = self.init_concepts("lesser", "foo", "bar")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_lesser(context, "prop_name", lesser)

        # sanity check
        res = sheerka.set_is_greater_than(context, "prop_name", foo, lesser)
        assert res.status

        res = sheerka.set_is_less_than(context, "prop_name", bar, lesser)
        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.IS_LESSER_CONSTRAINT_ERROR)

    def test_a_greatest_concept_has_the_highest_weight(self):
        sheerka, context, one, two, three = self.init_concepts("one", "two", "three")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greatest(context, "prop_name", three)
        assert service.get_weights("prop_name") == {"c:three|1003:": 2}  # DEFAULT_COMPARISON_VALUE + 1

        sheerka.set_is_greater_than(context, "prop_name", two, one)
        assert service.get_weights("prop_name") == {"c:one|1001:": 1, "c:two|1002:": 2, "c:three|1003:": 3}

    def test_i_cannot_define_greater_than_a_greatest_if_not_a_greater_itself(self):
        sheerka, context, greatest, foo, bar = self.init_concepts("greatest", "foo", "bar")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greatest(context, "prop_name", greatest)

        # sanity check
        res = sheerka.set_is_less_than(context, "prop_name", foo, greatest)
        assert res.status

        res = sheerka.set_is_greater_than(context, "prop_name", bar, greatest)
        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.IS_GREATEST_CONSTRAINT_ERROR)

    @pytest.mark.parametrize("definitions, expected", [
        (["foo >>", "foo <<"], BuiltinConcepts.IS_GREATEST_CONSTRAINT_ERROR),
        (["foo <<", "foo >>"], BuiltinConcepts.IS_LESSER_CONSTRAINT_ERROR),
    ])
    def test_i_cannot_define_a_concept_as_lesser_and_greatest_at_the_same_time(self, definitions, expected):
        sheerka, context, foo = self.init_concepts("foo")
        service = sheerka.services[SheerkaComparisonManager.NAME]
        concepts_map = {"foo": foo}

        self.execution_definition(context, service, concepts_map, definitions[0])
        res = self.execution_definition(context, service, concepts_map, definitions[1])
        assert not res.status
        assert sheerka.isinstance(res.body, expected)

    def test_i_can_define_an_order_for_greatest_concepts(self):
        sheerka, context, greatest, more_g, even_more_g = self.init_concepts("greatest", "more_g", "even_more_g")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greatest(context, "prop_name", greatest)
        service.set_is_greatest(context, "prop_name", more_g)
        service.set_is_greatest(context, "prop_name", even_more_g)

        sheerka.set_is_less_than(context, "prop_name", greatest, more_g)
        sheerka.set_is_greater_than(context, "prop_name", even_more_g, more_g)
        assert service.get_weights("prop_name") == {"c:greatest|1001:": 2,
                                                             "c:more_g|1002:": 3,
                                                             "c:even_more_g|1003:": 4}

    def test_i_can_mix_all_comparisons(self):
        sheerka, context, one, two, three, four, five, six, three_and_half = self.init_concepts(
            "one", "two", "three", "four", "five", "six", "two_and_half")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_lesser(context, "prop_name", one)
        service.set_is_lesser(context, "prop_name", two)
        sheerka.set_is_less_than(context, "prop_name", one, two)

        service.set_is_greatest(context, "prop_name", five)
        service.set_is_greatest(context, "prop_name", six)
        sheerka.set_is_greater_than(context, "prop_name", six, five)

        sheerka.set_is_less_than(context, "prop_name", three, four)

        assert service.get_weights("prop_name") == {
            "c:one|1001:": -1,
            "c:two|1002:": 0,
            "c:three|1003:": 1,
            "c:four|1004:": 2,
            "c:five|1005:": 3,
            "c:six|1006:": 4
        }

        sheerka.set_is_less_than(context, "prop_name", three_and_half, four)
        sheerka.set_is_greater_than(context, "prop_name", three_and_half, three)

        assert service.get_weights("prop_name") == {
            "c:one|1001:": -1,
            "c:two|1002:": 0,
            "c:three|1003:": 1,
            "c:two_and_half|1007:": 2,
            "c:four|1004:": 3,
            "c:five|1005:": 4,
            "c:six|1006:": 5
        }

    def test_i_can_mix_all_comparisons_2(self):
        sheerka, context, zero, one, two, three, four, five, thousand = self.init_concepts(
            "zero", "one", "two", "three", "four", "five", "thousand")
        service = sheerka.services[SheerkaComparisonManager.NAME]

        service.set_is_greater_than(context, "prop_name", four, one)
        service.set_is_less_than(context, "prop_name", one, five)
        service.set_is_less_than(context, "prop_name", one, three)
        service.set_is_less_than(context, "prop_name", two, three)
        service.set_is_greater_than(context, "prop_name", two, one)
        service.set_is_greater_than(context, "prop_name", five, four)
        service.set_is_less_than(context, "prop_name", three, four)
        service.set_is_greatest(context, "prop_name", thousand)
        service.set_is_lesser(context, "prop_name", zero)
        service.set_is_less_than(context, "prop_name", two, five)
        service.set_is_less_than(context, "prop_name", two, four)
        service.set_is_greater_than(context, "prop_name", five, one)
        service.set_is_greater_than(context, "prop_name", five, three)

        assert service.get_weights("prop_name") == {
            "c:zero|1001:": 0,
            "c:one|1002:": 1,
            "c:two|1003:": 2,
            "c:three|1004:": 3,
            "c:four|1005:": 4,
            "c:five|1006:": 5,
            "c:thousand|1007:": 6
        }

    @pytest.mark.parametrize("definition", [
        "one >>",
        "one <<",
        "one > two",
        "one < two",
    ])
    def test_i_cannot_add_the_same_definition_twice(self, definition):
        sheerka, context, *concepts = self.init_concepts("one", "two")
        service = sheerka.services[SheerkaComparisonManager.NAME]
        concepts_map = dict(zip(["one", "two"], concepts))

        self.execution_definition(context, service, concepts_map, definition)
        res = self.execution_definition(context, service, concepts_map, definition)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.COMPARISON_ALREADY_DEFINED)

    def test_an_event_is_fired_when_modifying_concepts_precedence(self):
        sheerka, context, one, two, foo = self.init_concepts("one", "two", "foo")
        event_received = False

        def receive_event(c):
            nonlocal event_received
            event_received = True

        sheerka.subscribe(EVENT_CONCEPT_PRECEDENCE_MODIFIED, receive_event)

        sheerka.set_is_greater_than(context, foo, one, two)
        assert not event_received

        sheerka.set_is_greater_than(context, BuiltinConcepts.PRECEDENCE, foo, one, two)
        assert not event_received

        sheerka.set_is_greater_than(context, BuiltinConcepts.PRECEDENCE, one, two, CONCEPT_COMPARISON_CONTEXT)
        assert event_received

    def test_an_event_is_fired_when_modifying_rule_precedence(self):
        sheerka, context, r1, r2 = self.init_test(cache_only=False).with_format_rules(("True", "true"),
                                                                                      ("False", "false"),
                                                                                      compile_rule=False).unpack()
        foo = Concept("foo")
        event_received = False
        sheerka.om.clear(SheerkaComparisonManager.COMPARISON_ENTRY)

        def receive_event(c):
            nonlocal event_received
            event_received = True

        sheerka.subscribe(EVENT_RULE_PRECEDENCE_MODIFIED, receive_event)

        sheerka.set_is_greater_than(context, foo, r1, r2)
        assert not event_received

        sheerka.set_is_greater_than(context, BuiltinConcepts.PRECEDENCE, foo, r1, r2)
        assert not event_received

        sheerka.set_is_greater_than(context, BuiltinConcepts.PRECEDENCE, r1, r2, RULE_COMPARISON_CONTEXT)
        assert event_received

    @pytest.mark.parametrize("entries, expected", [
        ([], (set(), set(), set())),
        (["a<<", "a<<", "b<<", "a<c"], (set(), {"a", "b"}, {"a", "b", "c"})),
        (["a>>", "a>>", "b>>", "a<c"], ({"a", "b"}, set(), {"a", "b", "c"})),
        (["a<<", "b>>", "c=d", "e<f", "g>h"], ({"b"}, {"a"}, {"a", "b", "c", "d", "e", "f", "g", "h"})),
    ])
    def test_i_can_get_objs_groups(self, entries, expected):
        comparison_objs = self.get_comparison_objs(entries)
        assert SheerkaComparisonManager.get_objs_groups(comparison_objs) == expected

    @pytest.mark.parametrize("entries, greatest, lowest, expected_tuple", [
        # greatest
        (["a < b"], {"a", "b"}, set(), (["a < b"], [], [], [])),
        (["a > b"], {"a", "b"}, set(), (["a > b"], [], [], [])),

        # lowest
        (["a < b"], set(), {"a", "b"}, ([], ["a < b"], [], [])),
        (["a > b"], set(), {"a", "b"}, ([], ["a > b"], [], [])),

        # equiv
        (["a = b"], set(), set(), ([], [], ["a = b"], [])),

        # neither
        (["a < b"], set(), set(), ([], [], [], ["a < b"])),
        (["a > b"], set(), set(), ([], [], [], ["a > b"])),

        # irrelevant information
        (["a > b"], {"a"}, set(), ([], [], [], [])),
        (["a > b"], set(), {"b"}, ([], [], [], [])),
        (["a < b"], {"b"}, set(), ([], [], [], [])),
        (["a < b"], set(), {"a"}, ([], [], [], [])),

        # mixed
        (["a<b", "c<d", "e<f", "z=b"], {"a", "b", "c", "d"}, set(), (["a<b", "c<d"], [], ["z=b"], ["e<f"])),
    ])
    def test_i_can_group_comparison_objs(self, entries, greatest, lowest, expected_tuple):
        comparison_objs = self.get_comparison_objs(entries)
        g, l, e, o = SheerkaComparisonManager.group_comparison_objs(comparison_objs, greatest, lowest)

        def compare_results(actual_result, expected_result):
            assert len(actual_result) == len(expected_result)
            for actual, expected in zip(actual_result, expected_result):
                expected_comparison_obj = list(self.get_comparison_objs([expected]))[0]
                assert actual.a == expected_comparison_obj.a
                assert actual.b == expected_comparison_obj.b
                assert actual.op == expected_comparison_obj.op

        compare_results(g, expected_tuple[0])
        compare_results(l, expected_tuple[1])
        compare_results(e, expected_tuple[2])
        compare_results(o, expected_tuple[3])

    @pytest.mark.parametrize("entries, expected", [
        ([], {}),
        (["a < b"], {"a": 1, "b": 2}),
        (["a > b"], {"a": 2, "b": 1}),
        (["a < b", "b > a"], {"a": 1, "b": 2}),
        (["a < b", "b < c"], {"a": 1, "b": 2, "c": 3}),
        (["a < b", "a < c"], {"a": 1, "b": 2, "c": 2}),

        # greatest between themselves
        (["a < b", "a>>", "b>>"], {"a": 2, "b": 3}),
        (["a > b", "a>>", "b>>"], {"a": 3, "b": 2}),
        (["a < b", "b > a", "a>>", "b>>"], {"a": 2, "b": 3}),
        (["a < b", "b < c", "a>>", "b>>", "c>>"], {"a": 2, "b": 3, "c": 4}),
        (["a < b", "a < c", "a>>", "b>>", "c>>"], {"a": 2, "b": 3, "c": 3}),

        # lowest between themselves
        (["a < b", "a<<", "b<<"], {"a": -1, "b": 0}),
        (["a > b", "a<<", "b<<"], {"a": 0, "b": -1}),
        (["a < b", "b > a", "a<<", "b<<"], {"a": -1, "b": 0}),
        (["a < b", "b < c", "a<<", "b<<", "c<<"], {"a": -2, "b": -1, "c": 0}),
        (["a < b", "a < c", "a<<", "b<<", "c<<"], {"a": -1, "b": 0, "c": 0}),

        # greatest that does not appear in other relations
        (["a >>", "b < c"], {"a": 3, "b": 1, "c": 2}),
        (["a >>", "a > b"], {"a": 2, "b": 1}),
        (["a >>", "a > b", "c > d", "d > e"], {"a": 4, "b": 1, "c": 3, "d": 2, "e": 1}),

        # lowest that does not appear in other relations
        (["a <<", "b < c"], {"a": 0, "b": 1, "c": 2}),
        (["a <<", "a < b"], {"a": 0, "b": 1}),
        (["a <<", "a < b", "c < d", "d < e"], {"a": 0, "b": 1, "c": 1, "d": 2, "e": 3}),
        (["z <<", "a<<", "b<<", "c<<", "a < b", "b < c"], {"a": -2, "b": -1, "c": 0, "z": -3}),

        # eq
        (["a = b"], {"a": 1, "b": 1}),
        (["a = b", "b > c"], {"a": 2, "b": 2, "c": 1}),
        (["a = z", "z>>", "b<c", "c<d"], {"a": 4, "b": 1, "c": 2, "d": 3, "z": 4}),
        (["b = a", "c = b", "a > d"], {"a": 2, "b": 2, "c": 2, "d": 1}),
        (["a = b", "b = c", "a > d"], {"a": 2, "b": 2, "c": 2, "d": 1}),
        #(["a = b", "b = c", "c > d"], {"a": 2, "b": 2, "c": 2, "d": 1}), # not working

        # mix greatest and lesser
        (["a >>", "b<<", "a > b"], {"a": 2, "b": 0}),
    ])
    def test_i_can_compute_weight_new(self, entries, expected):
        comparison_objs = list(self.get_comparison_objs(entries))
        assert SheerkaComparisonManager.compute_weights(comparison_objs) == expected

    @pytest.mark.parametrize("previous_entries, new_entry, items_in_cycle", [
        (["a > b"], "b > a", {"a", "b"}),
        (["a > b", "c > d"], "b > a", {"a", "b"}),
        (["a < b", "b < c"], "c < a", {"a", "b", "c"}),
    ])
    def test_validate_new_entry_i_can_detect_cycle(self, previous_entries, new_entry, items_in_cycle):
        sheerka, context = self.init_test().unpack()

        new_co = list(self.get_comparison_objs([new_entry]))[0]
        previous_comparison_objs = list(self.get_comparison_objs(previous_entries))

        res = SheerkaComparisonManager.validate_new_entry(context, new_co, previous_comparison_objs)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.CHICKEN_AND_EGG)
        assert set(res.body.body) == items_in_cycle

    @pytest.mark.parametrize("previous_entries, new_entry", [
        (["a > b"], "a > b"),
        (["a < b"], "a < b"),
        (["a = b"], "a = b"),
        (["a <<"], "a <<"),
        (["a >>"], "a >>"),
    ])
    def test_validate_new_entry_i_can_detect_duplicate_entries(self, previous_entries, new_entry):
        sheerka, context = self.init_test().unpack()

        new_co = list(self.get_comparison_objs([new_entry]))[0]
        previous_comparison_objs = list(self.get_comparison_objs(previous_entries))

        res = SheerkaComparisonManager.validate_new_entry(context, new_co, previous_comparison_objs)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.COMPARISON_ALREADY_DEFINED)

    @pytest.mark.parametrize("previous_entries, new_entry", [
        (["a>>"], "a<<"),
        (["a>>"], "a < b"),
        (["a>>"], "b > a"),
    ])
    def test_validate_new_entry_i_can_detect_is_greatest_constraint_error(self, previous_entries, new_entry):
        sheerka, context = self.init_test().unpack()

        new_co = list(self.get_comparison_objs([new_entry]))[0]
        previous_comparison_objs = list(self.get_comparison_objs(previous_entries))

        res = SheerkaComparisonManager.validate_new_entry(context, new_co, previous_comparison_objs)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.IS_GREATEST_CONSTRAINT_ERROR)

    @pytest.mark.parametrize("previous_entries, new_entry", [
        (["a<<"], "a>>"),
        (["a<<"], "a > b"),
        (["a<<"], "b < a"),
    ])
    def test_validate_new_entry_i_can_detect_is_lesser_constraint_error(self, previous_entries, new_entry):
        sheerka, context = self.init_test().unpack()

        new_co = list(self.get_comparison_objs([new_entry]))[0]
        previous_comparison_objs = list(self.get_comparison_objs(previous_entries))

        res = SheerkaComparisonManager.validate_new_entry(context, new_co, previous_comparison_objs)

        assert not res.status
        assert sheerka.isinstance(res.body, BuiltinConcepts.IS_LESSER_CONSTRAINT_ERROR)