import ast
import pytest
import core.builtin_helpers

from core.builtin_concepts import ReturnValueConcept, BuiltinConcepts

from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka


class TestBuiltinHelpers(TestUsingMemoryBasedSheerka):

    def test_i_can_use_expect_one_when_empty(self):
        sheerka = self.get_sheerka()

        res = core.builtin_helpers.expect_one(self.get_context(sheerka), [])
        assert not res.status
        assert sheerka.isinstance(res.value, BuiltinConcepts.IS_EMPTY)

    def test_i_can_use_expect_one_when_too_many_success(self):
        sheerka = self.get_sheerka()

        items = [
            ReturnValueConcept("who", True, "value1"),
            ReturnValueConcept("who", True, "value2"),
        ]
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), items)
        assert not res.status
        assert sheerka.isinstance(res.value, BuiltinConcepts.TOO_MANY_SUCCESS)
        assert res.value.body == items
        assert res.parents == items

    def test_i_can_use_expect_one_when_same_success(self):
        sheerka = self.get_sheerka()

        items = [
            ReturnValueConcept("who", True, "value"),
            ReturnValueConcept("who", True, "value"),
        ]
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), items)
        assert res.status
        assert res.value == items[0].value
        assert res.parents == items

    def test_i_can_use_expect_when_only_errors_1(self):
        sheerka = self.get_sheerka()

        items = [
            ReturnValueConcept("who", False, sheerka.new(BuiltinConcepts.ERROR)),
        ]
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), items)
        assert not res.status
        assert res.value, items[0]
        assert res.parents == items

    def test_i_can_use_expect_when_only_errors_2(self):
        sheerka = self.get_sheerka()

        items = [
            ReturnValueConcept("who", False, None),
            ReturnValueConcept("who", False, None),
        ]
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), items)
        assert not res.status
        assert sheerka.isinstance(res.value, BuiltinConcepts.TOO_MANY_ERRORS)
        assert res.value.body == items
        assert res.parents == items

    def test_i_can_use_expect_one_when_one_success_1(self):
        sheerka = self.get_sheerka()

        items = [
            ReturnValueConcept("who", True, None),
        ]
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), items)
        assert res.status
        assert res.body == items[0].body
        assert res.parents == items

    def test_i_can_use_expect_one_when_one_success_2(self):
        sheerka = self.get_sheerka()

        items = [
            ReturnValueConcept("who", False, None),
            ReturnValueConcept("who", True, None),
            ReturnValueConcept("who", False, None),
        ]
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), items)
        assert res.status
        assert res.body == items[1].body
        assert res.parents == items

    def test_i_can_use_expect_one_when_not_a_list_true(self):
        sheerka = self.get_sheerka()

        item = ReturnValueConcept("who", True, None)
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), item)
        assert res.status
        assert res == item

    def test_i_can_use_expect_one_when_not_a_list_false(self):
        sheerka = self.get_sheerka()

        item = ReturnValueConcept("who", False, None)
        res = core.builtin_helpers.expect_one(self.get_context(sheerka), item)

        assert not res.status
        assert res == item

    @pytest.mark.parametrize("expression, vars_to_include, vars_to_exclude, expected_expr", [
        ("a == 1", [], [], []),
        ("a == 1", ["a"], [], ["a == 1"]),
        ("a == 1", [], ["a"], []),
        ("predicate(a)", [], [], []),
        ("predicate(a)", ["a"], [], ["predicate(a)"]),
        ("predicate(a, b)", ["a"], [], ["predicate(a, b)"]),
        ("predicate(a, b)", ["b"], [], ["predicate(a, b)"]),
        ("predicate(a, b)", ["a", "b"], [], ["predicate(a, b)"]),
        ("predicate(a, b)", ["a"], ["b"], []),
        ("a + b == 1", [], [], []),
        ("a + b == 1", ["a"], [], ["a + b == 1"]),
        ("a + b == 1", ["a"], ["b"], []),
        ("a + b == 1", ["b"], [], ["a + b == 1"]),
        ("a + b == 1", ["a", "b"], [], ["a + b == 1"]),
        ("a == 1 and b == 2", [], [], []),
        ("a == 1 and b == 2", ["a"], [], ["a == 1"]),
        ("a == 1 and b == 2", ["b"], [], ["b == 2"]),
        ("a == 1 and b == 2", ["a"], ["b"], ["a == 1"]),
        ("a == 1 and b == 2", ["a", "b"], [], ["a == 1 and b == 2"]),
        ("predicate(a,c) and predicate(b,c)", ["a", "b"], [], ["predicate(a,c) and predicate(b,c)"]),
        ("not(a == 1)", [], [], []),
        ("not(a == 1)", ["a"], [], ["not(a==1)"]),
        ("a == 1 or b == 2", [], [], []),
        ("a == 1 or b == 2", ["a"], [], ["a == 1"]),
        ("a == 1 or b == 2", ["b"], [], ["b == 2"]),
        ("a == 1 or b == 2", ["a", "b"], [], ["a == 1 or b == 2"]),
        ("predicate(a,c) or predicate(b,c)", ["a", "b"], [], ["predicate(a,c) or predicate(b,c)"]),
        ("a < 1 and a > b", ["a"], [], ["a < 1 and a > b"]),
    ])
    def test_i_can_extract_predicates(self, expression, vars_to_include, vars_to_exclude, expected_expr):
        sheerka = self.get_sheerka()
        expected = [ast.parse(expr, mode="eval") for expr in expected_expr]

        actual = core.builtin_helpers.extract_predicates(sheerka, expression, vars_to_include, vars_to_exclude)
        assert len(actual) == len(expected)
        for i in range(len(actual)):
            assert self.dump_ast(actual[i]) == self.dump_ast(expected[i])