import os
import shutil
from os import path

import pytest
import ast

from core.ast.nodes import NodeParent, GenericNodeConcept
import core.ast.nodes
from core.ast.visitors import ConceptNodeVisitor, UnreferencedNamesVisitor
from core.builtin_concepts import BuiltinConcepts
from core.sheerka import Sheerka

tests_root = path.abspath("../build/tests")
root_folder = "init_folder"


@pytest.fixture(autouse=True)
def init_test():
    if path.exists(tests_root):
        shutil.rmtree(tests_root)

    if not path.exists(tests_root):
        os.makedirs(tests_root)
    current_pwd = os.getcwd()
    os.chdir(tests_root)

    yield None

    os.chdir(current_pwd)


def get_sheerka():
    sheerka = Sheerka()
    sheerka.initialize(root_folder)

    return sheerka


class TestNameVisitor(ConceptNodeVisitor):
    """
    Test class for a basic Visitor test
    """

    def __init__(self):
        self.names = []

    def visit_Name(self, node):
        self.names.append(node)


def test_i_can_transform_simple_ast_using_generic_node():
    source = """
def my_function(a,b):
    for i in range(b):
        a = a+b
    return a
"""
    tree = ast.parse(source)
    tree_as_concept = core.ast.nodes.transform(tree)
    sheerka = get_sheerka()

    assert tree_as_concept.node_type == "Module"
    assert sheerka.isinstance(tree_as_concept.get_prop("body"), BuiltinConcepts.LIST)

    def_func = tree_as_concept.get_prop("body")[0]
    assert sheerka.isinstance(def_func, BuiltinConcepts.GENERIC_NODE)
    assert def_func.node_type == "FunctionDef"
    assert def_func.parent == NodeParent(tree_as_concept, "body")
    assert def_func.get_prop("name") == "my_function"

    def_func_args = def_func.get_prop("args")
    assert sheerka.isinstance(def_func_args, BuiltinConcepts.GENERIC_NODE)
    assert def_func_args.node_type == "arguments"

    def_func_args_real_args = def_func_args.get_prop("args")
    assert sheerka.isinstance(def_func_args_real_args, BuiltinConcepts.LIST)
    assert len(def_func_args_real_args) == 2

    assert sheerka.isinstance(def_func_args_real_args[0], BuiltinConcepts.GENERIC_NODE)
    assert def_func_args_real_args[0].node_type == "arg"
    assert def_func_args_real_args[0].parent == NodeParent(def_func_args, "args")
    assert def_func_args_real_args[0].get_prop("arg") == "a"
    assert sheerka.isinstance(def_func_args_real_args[1], BuiltinConcepts.GENERIC_NODE)
    assert def_func_args_real_args[1].node_type == "arg"
    assert def_func_args_real_args[1].parent == NodeParent(def_func_args, "args")
    assert def_func_args_real_args[1].get_prop("arg") == "b"

    def_fun_body = def_func.get_prop("body")
    assert sheerka.isinstance(def_fun_body, BuiltinConcepts.LIST)
    assert len(def_fun_body) == 2

    def_fun_body_for = def_fun_body[0]
    assert sheerka.isinstance(def_fun_body_for, BuiltinConcepts.GENERIC_NODE)
    assert def_fun_body_for.node_type == "For"
    assert def_fun_body_for.parent == NodeParent(def_func, "body")

    def_fun_body_return = def_fun_body[1]
    assert sheerka.isinstance(def_fun_body_return, BuiltinConcepts.GENERIC_NODE)
    assert def_fun_body_return.node_type == "Return"
    assert def_fun_body_return.parent == NodeParent(def_func, "body")


def test_i_can_visit_concept_node():
    source = """
def my_function(a,b):
    for i in range(b):
        a = a+b
    return a
    """

    node = ast.parse(source)
    concept_node = core.ast.nodes.transform(node)

    visitor = TestNameVisitor()
    visitor.visit(concept_node)

    sheerka = get_sheerka()
    assert sheerka.value(visitor.names[0]) == "i"
    assert sheerka.value(visitor.names[1]) == "range"
    assert sheerka.value(visitor.names[2]) == "b"
    assert sheerka.value(visitor.names[3]) == "a"
    assert sheerka.value(visitor.names[4]) == "a"
    assert sheerka.value(visitor.names[5]) == "b"
    assert sheerka.value(visitor.names[6]) == "a"


def test_i_can_get_non_referenced_variables():
    source = """
def my_function(a,b):
    for i in range(b):
        a = a+b
    return a

my_function(x,y)
"""

    sheerka = get_sheerka()

    node = ast.parse(source)
    concept_node = core.ast.nodes.transform(node)

    visitor = UnreferencedNamesVisitor(sheerka)
    visitor.visit(concept_node)
    values = visitor.names

    assert len(visitor.names) == 2
    assert "x" in values
    assert "y" in values


def test_i_can_compare_NodeParent_with_tuple():
    node_parent = NodeParent(GenericNodeConcept("For", None), "target")
    assert node_parent == ("For", "target")