from core.concept import Concept, ConceptParts
from core.sheerka.Services.SheerkaVariableManager import SheerkaVariableManager

from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka


class TestSheerkaVariable(TestUsingMemoryBasedSheerka):
    def test_i_can_record_and_load_a_constant(self):
        sheerka = self.get_sheerka()
        context = self.get_context(sheerka)

        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
        res = sheerka.load("TestSheerkaVariable", "my_variable")
        assert res == 1

        assert sheerka.sdp.exists(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
        assert loaded.event_id == context.event.get_digest()
        assert loaded.key == "my_variable"
        assert loaded.value == 1
        assert loaded.who == "TestSheerkaVariable"
        assert loaded.parents is None

    def test_i_can_record_and_load_a_concept(self):
        sheerka = self.get_sheerka()
        context = self.get_context(sheerka)

        concept = Concept("foo").set_prop("a", "alpha").set_metadata_value(ConceptParts.BODY, 3.14)

        sheerka.record(context, "TestSheerkaVariable", "my_variable", concept)
        res = sheerka.load("TestSheerkaVariable", "my_variable")

        assert res == concept
        assert res.body == concept.body

    def test_i_can_get_the_parent_when_modified(self):
        sheerka = self.get_sheerka()
        context = self.get_context(sheerka)

        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
        sheerka.record(context, "TestSheerkaVariable", "my_variable", 2)
        res = sheerka.load("TestSheerkaVariable", "my_variable")
        assert res == 2

        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
        assert loaded.event_id == context.event.get_digest()
        assert loaded.key == "my_variable"
        assert loaded.value == 2
        assert loaded.who == "TestSheerkaVariable"
        assert loaded.parents == ['8c9ada7bf488d84229f6539f76042431638f16d600fe3b7ec7e7161043a40d59']

        parent = sheerka.sdp.load_obj(loaded.parents[0])
        assert parent.event_id == context.event.get_digest()
        assert parent.key == "my_variable"
        assert parent.value == 1
        assert parent.who == "TestSheerkaVariable"
        assert parent.parents is None

    def test_variable_is_not_persisted_if_the_value_is_the_same(self):
        sheerka = self.get_sheerka()
        context = self.get_context(sheerka)

        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)

        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
        assert loaded.event_id == context.event.get_digest()
        assert loaded.key == "my_variable"
        assert loaded.value == 1
        assert loaded.who == "TestSheerkaVariable"
        assert loaded.parents is None