import ast
import inspect
import linecache
import os
import sys
import dis
from time import sleep

import asttokens
from executing._pytest_utils import is_pytest_compatible
import pytest
from littleutils import SimpleNamespace

import executing.executing
from executing import Source, NotOneValueFound
from executing._exceptions import KnownIssue
from executing.executing import is_ipython_cell_code, is_rewritten_by_pytest
from executing._utils import get_instructions, mangled_name

from textwrap import indent

sys.path.append(os.path.dirname(os.path.dirname(__file__)))


def test_pytest():
    from tests.utils import tester

    lst = [1, 2, 3]
    lst2 = tester(lst)
    assert lst == lst2
    lst3 = tester(lst + [4])
    assert (
            [1, 2, 3, 4]
            == lst3
    ), 'message'
    x = tester.x
    assert x is tester


def test_ipython_cell_code():
    assert is_ipython_cell_code(
        SimpleNamespace(
            co_name="<cell line: 1>",
            co_filename="tmp/ipykernel_3/foo",
        )
    )

    assert not is_ipython_cell_code(
        SimpleNamespace(
            co_name="<cell line: 1",
            co_filename="tmp/ipykernel_3/foo",
        )
    )

    assert not is_ipython_cell_code(
        SimpleNamespace(
            co_name="<cell line: 1>",
            co_filename="tmp/ipykernel_3",
        )
    )


def test_source_file_text_change(tmpdir):
    # Check that Source.for_filename notices changes in file contents
    # (assuming that linecache can notice)

    path = str(tmpdir.join('foo.py'))
    with open(path, "w") as f:
        f.write("1\n")

    # Initial sanity check.
    source = Source.for_filename(path)
    assert source.text == "1\n"

    # Wait a little before changing the file so that the mtime is different
    # so that linecache.checkcache() notices.
    sleep(0.01)
    with open(path, "w") as f:
        f.write("2\n")
    source = Source.for_filename(path)
    assert source.text == "2\n"


def test_manual_linecache():
    # Test that manually putting lines in linecache
    # under fake filenames works, and the linecache entries aren't removed.
    check_manual_linecache(os.path.join("fake", "path", "to", "foo.py"))
    check_manual_linecache("<my_custom_filename>")


def check_manual_linecache(filename):
    text = "foo\nbar\n"
    lines = text.splitlines(True)
    assert lines == ["foo\n", "bar\n"]

    entry = (len(text), 0, lines, filename)
    linecache.cache[filename] = entry

    # sanity check
    assert linecache.cache[filename] == entry
    assert linecache.getlines(filename) == lines

    # checkcache normally removes the entry because the filename doesn't exist
    linecache.checkcache(filename)
    assert filename not in linecache.cache
    assert linecache.getlines(filename) == []

    # Source.for_filename uses checkcache but makes sure the entry isn't removed
    linecache.cache[filename] = entry
    source = Source.for_filename(filename)
    assert linecache.cache[filename] == entry
    assert source.text == text


def test_exception_catching():
    frame = inspect.currentframe()

    if is_pytest_compatible():
        assert isinstance(Source.executing(frame).node,ast.Call)
        return 

    executing.executing.TESTING = True  # this is already the case in all other tests
    # Sanity check that this operation usually raises an exception.
    # This actually depends on executing not working in the presence of pytest.
    with pytest.raises((NotOneValueFound, KnownIssue)):
        assert Source.executing(frame).node is None

    # By contrast, TESTING is usually false when executing is used in real code.
    # In that case, the exception is caught and the result is None.
    executing.executing.TESTING = False
    try:
        assert Source.executing(frame).node is None
    finally:
        executing.executing.TESTING = True


def test_bad_linecache():
    # Test graceful failure when linecache contains source lines that don't match
    # the real code being executed.
    fake_text = "foo bar baz"  # invalid syntax, so source.tree is None
    text = """
frame = inspect.currentframe()
ex = Source.executing(frame)
"""
    filename = "<test_bad_linecache>"
    code = compile(text, filename, "exec")
    linecache.cache[filename] = (len(fake_text), 0, fake_text.splitlines(True), filename)
    globs = dict(globals())
    exec(code, globs)
    ex = globs["ex"]
    frame = globs["frame"]
    assert ex.node is None
    assert ex.statements is None
    assert ex.decorator is None
    assert ex.frame is frame
    assert ex.source.tree is None
    assert ex.source.text == fake_text



def test_mangled_name():
        def result(*code_levels):
            code = ""
            for i, level in enumerate(code_levels):
                code += indent(level, "    " * i) + "\n"

            tree = ast.parse(code)

            for parent in ast.walk(tree):
                for child in ast.iter_child_nodes(parent):
                    child.parent = parent


            ast_types=(
                ast.Name,
                ast.Attribute,
                ast.alias,
                ast.FunctionDef,
                ast.ClassDef,
                ast.ExceptHandler,
                ast.AsyncFunctionDef,
            )

            tree_names = {
                mangled_name(n)
                for n in ast.walk(tree)
                if isinstance(
                    n,
                ast_types
                    ,
                )
            }

            def collect_names(code):
                for instruction in get_instructions(code):
                    if instruction.opname in (
                        "STORE_NAME",
                        "LOAD_NAME",
                        "LOAD_GLOBAL",
                        "STORE_FAST",
                        "LOAD_FAST",
                        "LOAD_FAST_BORROW",
                        "LOAD_ATTR",
                        "STORE_ATTR",
                    ):
                        # TODO: "IMPORT_FROM" gets also mangled but is currently not handled by executing
                        #
                        # class Test:
                        #     from __mangle11c.__suc11c import __submodule11c as __subc11
                        # IMPORT_FROM(_Test__submodule11c)
                        # STORE_NAME(_Test__subc11)

                        name = instruction.argval
                        if name in ("__module__", "__qualname__", "__name__","__static_attributes__","__firstlineno__","__classdict__","__classdictcell__"):
                            continue

                        yield name

                for const in code.co_consts:
                    if isinstance(const, type(code)):
                        for name in collect_names(const):
                            yield name

            code_names = set(collect_names(compile(tree, "<code>", "exec")))

            assert code_names == tree_names

            return tree_names

        code = "from __mangle11c.__suc11c import __submodule11c as __subc11"

        assert result(code) == {"__subc11"}

        assert result("class Test:", code) == {"Test", "_Test__subc11"}

        assert result("class Test:", "def func():", code) == {
            "Test",
            "func",
            "_Test__subc11",
        }

        code = """
import __mangled1.submodule1
import __mangled2.__submodule2
import __mangled3.submodule3 as __sub3
import __mangled4.__submodule4 as __sub4
import __mangled5.__submodule5 as sub5
from __mangled6 import submodule6
from __mangle7.sub7 import submodule7
from __mangle8.__sub8 import submodule8
from __mangle9 import submodule9
from __mangle10.sub10 import submodule10
from __mangle11.__sub11 import submodule11
from __mangled6b import __submodule6b
from __mangle7b.sub7b import __submodule7b
from __mangle8b.__sub8b import __submodule8b
from __mangle9b import __submodule9b
from __mangle10b.sub10b import __submodule10b
from __mangle11b.__sub11b import __submodule11b
from __mangled6c import __submodule6c as __subc6
from __mangle7c.suc7c import __submodule7c as __subc7
from __mangle8c.__suc8c import __submodule8c as __subc8
from __mangle9c import __submodule9c as __subc9
from __mangle10c.suc10c import __submodule10c as __subc10
from __mangle11c.__suc11c import __submodule11c as __subc11
"""

        assert result("class Test:", "def func():", code) == {
            "Test",
            "_Test__mangled1",
            "_Test__mangled2",
            "_Test__sub3",
            "_Test__sub4",
            "_Test__subc10",
            "_Test__subc11",
            "_Test__subc6",
            "_Test__subc7",
            "_Test__subc8",
            "_Test__subc9",
            "_Test__submodule10b",
            "_Test__submodule11b",
            "_Test__submodule6b",
            "_Test__submodule7b",
            "_Test__submodule8b",
            "_Test__submodule9b",
            "func",
            "sub5",
            "submodule10",
            "submodule11",
            "submodule6",
            "submodule7",
            "submodule8",
            "submodule9",
        }

        code = """
__mangled_var=3
__not_mangled__=5
normal_var=6

q.__attribute

try:
    pass
except TypeError as __exception:
    pass

for __var in [1]:
    pass
"""
        assert result("class Test:", "def func():", code) == {
            "Test",
            "TypeError",
            "_Test__attribute",
            "_Test__exception",
            "_Test__mangled_var",
            "_Test__var",
            "__not_mangled__",
            "func",
            "normal_var",
            "q",
        }

        # different context

        assert result("class Test:", "def func():", "e.__a=5") == {
            "Test",
            "func",
            "_Test__a",
            "e",
        }

        assert result("class __Test:", "def func():", "e.__a=5") == {
            "__Test",
            "func",
            "_Test__a",
            "e",
        }

        assert result("class __Test:", "e.__a=5") == {
            "__Test",
            "_Test__a",
            "e",
        }

        assert result("class __Test_:", "def func():", "e.__a=5") == {
            "__Test_",
            "func",
            "_Test___a",
            "e",
        }

        assert result("class ___Test_:", "def func():", "e.__a=5") == {
            "___Test_",
            "func",
            "_Test___a",
            "e",
        }


        assert result("class __Testa:","class __Testb:" ,"e.__a=5") == {
            "__Testa",
            "_Testa__Testb",
            "_Testb__a",
            "e",
        }

        assert result(
            "class Test:",
            "def foo(self):",
            "class Patched(self.__attr):",
            "pass",
        ) == {"Patched", "foo", "self", "Test", "_Test__attr"}

        assert result(
            "class _:",
            "def a(self):",
            "self.__thing",
        ) == {"_","a", "self", "__thing"}

        assert result(
            "class __:",
            "def a(self):",
            "self.__thing",
        ) == {"__","a", "self", "__thing"}

        assert result(
            "class Test:",
            "class _:",
            "def a(self):",
            "self.__thing",
        ) == {"Test","_","a", "self", "__thing"}


        assert result(
        "@__thing\n"
        "class Test:\n"
            "    pass"
        )== {"Test","__thing"}
    


def test_pytest_rewrite():
    frame = inspect.currentframe()

    # check for assert statements rewrite caused by this assert
    assert is_rewritten_by_pytest(frame.f_code)


def test_no_pytest_rewrite():
    frame=inspect.currentframe()

    # no assert -> no rewrite
    if is_rewritten_by_pytest(frame.f_code):
        raise AssertionError("unexpected pytest assert rewrite")


def test_no_pytest_rewrite_with_consts():
    frame = inspect.currentframe()

    # LOAD_CONST "@py_assert..." should not trigger a false positive
    a = "@py_assert..."

    # no assert -> no rewrite
    if is_rewritten_by_pytest(frame.f_code):
        raise AssertionError("unexpected pytest assert rewrite")


def test_asttext():
    source = Source("file.py", ["a", "b"])
    assert source._asttext is None
    assert source._asttokens is None
    atext = source.asttext()
    assert atext is source.asttext() is source._asttext is not None
    assert source._asttokens is None
    atokens = source.asttokens()
    assert atext.asttokens is atokens is source.asttokens() is source._asttokens is not None
