import re
from typing import Any, Callable, Dict, List, Union

from pytest import mark, param, raises

from omegaconf import DictConfig, ListConfig, OmegaConf, ReadonlyConfigError


@mark.parametrize(
    "src, func, expectation",
    [
        param(
            {},
            lambda c: c.__setitem__("a", 1),
            raises(ReadonlyConfigError, match="a"),
            id="dict_setitem",
        ),
        param(
            {"a": None},
            lambda c: c.__setitem__("a", {"b": 10}),
            raises(ReadonlyConfigError, match="a"),
            id="dict_setitem",
        ),
        param(
            {"a": {"b": {"c": 1}}},
            lambda c: c.__getattr__("a").__getattr__("b").__setitem__("c", 1),
            raises(ReadonlyConfigError, match="a.b.c"),
            id="dict_nested_setitem",
        ),
        param(
            {},
            lambda c: OmegaConf.update(c, "a.b", 10),
            raises(ReadonlyConfigError, match="a"),
            id="dict_update",
        ),
        param(
            {"a": 10},
            lambda c: c.__setattr__("a", 1),
            raises(ReadonlyConfigError, match="a"),
            id="dict_setattr",
        ),
        param(
            {"a": 10},
            lambda c: c.pop("a"),
            raises(ReadonlyConfigError, match="a"),
            id="dict_pop",
        ),
        param(
            {"a": 10},
            lambda c: c.__delitem__("a"),
            raises(ReadonlyConfigError, match="a"),
            id="dict_delitem",
        ),
        param(
            {"a": 10},
            lambda c: c.__delattr__("a"),
            raises(ReadonlyConfigError, match="a"),
            id="dict_delattr",
        ),
        # list
        param(
            [],
            lambda c: c.__setitem__(0, 1),
            raises(ReadonlyConfigError, match="0"),
            id="list_setitem",
        ),
        param(
            [],
            lambda c: OmegaConf.update(c, "0.b", 10),
            raises(ReadonlyConfigError, match="[0]"),
            id="list_update",
        ),
        param([10], lambda c: c.pop(), raises(ReadonlyConfigError), id="list_pop"),
        param(
            [0],
            lambda c: c.__delitem__(0),
            raises(ReadonlyConfigError, match="[0]"),
            id="list_delitem",
        ),
    ],
)
def test_readonly(
    src: Union[Dict[str, Any], List[Any]], func: Callable[[Any], Any], expectation: Any
) -> None:
    c = OmegaConf.create(src)
    OmegaConf.set_readonly(c, True)
    with expectation:
        func(c)
    assert c == src


@mark.parametrize("src", [{}, []])
def test_readonly_flag(src: Union[Dict[str, Any], List[Any]]) -> None:
    c = OmegaConf.create(src)
    assert not OmegaConf.is_readonly(c)
    OmegaConf.set_readonly(c, True)
    assert OmegaConf.is_readonly(c)
    OmegaConf.set_readonly(c, False)
    assert not OmegaConf.is_readonly(c)
    OmegaConf.set_readonly(c, None)
    assert not OmegaConf.is_readonly(c)


def test_readonly_nested_list() -> None:
    c = OmegaConf.create([[1]])
    assert isinstance(c, ListConfig)
    assert not OmegaConf.is_readonly(c)
    assert not OmegaConf.is_readonly(c[0])
    OmegaConf.set_readonly(c, True)
    assert OmegaConf.is_readonly(c)
    assert OmegaConf.is_readonly(c[0])
    OmegaConf.set_readonly(c, False)
    assert not OmegaConf.is_readonly(c)
    assert not OmegaConf.is_readonly(c[0])
    OmegaConf.set_readonly(c, None)
    assert not OmegaConf.is_readonly(c)
    assert not OmegaConf.is_readonly(c[0])
    OmegaConf.set_readonly(c[0], True)
    assert not OmegaConf.is_readonly(c)
    assert OmegaConf.is_readonly(c[0])


def test_readonly_list_insert() -> None:
    c = OmegaConf.create([])
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError, match="[0]"):
        c.insert(0, 10)
    assert c == []


def test_readonly_list_insert_deep() -> None:
    src: List[Dict[str, Any]] = [dict(a=[dict(b=[])])]
    c = OmegaConf.create(src)
    assert isinstance(c, ListConfig)
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError, match=re.escape("[0].a[0].b[0]")):
        c[0].a[0].b.insert(0, 10)
    assert c == src


def test_readonly_list_append() -> None:
    c = OmegaConf.create([])
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError, match="[0]"):
        c.append(10)
    assert c == []


def test_readonly_list_change_item() -> None:
    c = OmegaConf.create([1, 2, 3])
    assert isinstance(c, ListConfig)
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError, match="[1]"):
        c[1] = 10
    assert c == [1, 2, 3]


def test_readonly_list_pop() -> None:
    c = OmegaConf.create([1, 2, 3])
    assert isinstance(c, ListConfig)
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError, match="[1]"):
        c.pop(1)
    assert c == [1, 2, 3]


def test_readonly_list_del() -> None:
    c = OmegaConf.create([1, 2, 3])
    assert isinstance(c, ListConfig)
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError, match="[1]"):
        del c[1]
    assert c == [1, 2, 3]


def test_readonly_list_sort() -> None:
    c = OmegaConf.create([3, 1, 2])
    assert isinstance(c, ListConfig)
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError):
        c.sort()
    assert c == [3, 1, 2]


def test_readonly_from_cli() -> None:
    c = OmegaConf.create({"foo": {"bar": [1]}})
    assert isinstance(c, DictConfig)
    OmegaConf.set_readonly(c, True)
    cli = OmegaConf.from_dotlist(["foo.bar=[2]"])
    cfg2 = OmegaConf.merge(c, cli)
    assert OmegaConf.is_readonly(c)
    assert OmegaConf.is_readonly(cfg2)


@mark.parametrize(
    "cfg1, cfg2",
    [
        param({"foo": {"bar": 10}}, {"foo": {"bar": 20}}, id="override_value"),
        param({"foo": {"bar": 10}}, {"foo": {"yup": 20}}, id="adding_key"),
        param({"a": 1}, {"b": 2}, id="adding_key"),
        param({"a": 1}, OmegaConf.create({"b": 2}), id="adding_key"),
    ],
)
def test_merge_with_readonly(cfg1: Dict[str, Any], cfg2: Dict[str, Any]) -> None:
    c = OmegaConf.create(cfg1)
    OmegaConf.set_readonly(c, True)
    with raises(ReadonlyConfigError):
        c.merge_with(cfg2)


@mark.parametrize(
    "readonly_key, cfg1, cfg2, expected",
    [
        param(
            "",
            {"foo": {"bar": 10}},
            {"foo": {}},
            {"foo": {"bar": 10}},
            id="merge_empty_dict",
        ),
        param(
            "foo",
            {"foo": {"bar": 10}},
            {"xyz": 10},
            {"foo": {"bar": 10}, "xyz": 10},
            id="merge_different_node",
        ),
    ],
)
def test_merge_with_readonly_nop(
    readonly_key: str,
    cfg1: Dict[str, Any],
    cfg2: Dict[str, Any],
    expected: Dict[str, Any],
) -> None:
    c = OmegaConf.create(cfg1)
    OmegaConf.set_readonly(OmegaConf.select(c, readonly_key), True)
    c.merge_with(cfg2)
    assert c == OmegaConf.create(expected)