import pytest
from cpl.core.abc.registry_abc import RegistryABC


class StringRegistry(RegistryABC[str]):
    def __init__(self):
        super().__init__()

    def extend(self, items: list[str]) -> None:
        for item in items:
            self.add(item)

    def add(self, item: str) -> None:
        self._items[item] = item

    def get(self, key: str) -> str | None:
        return self._items.get(key)

    def all(self) -> list[str]:
        return list(self._items.values())


def test_add_and_get():
    reg = StringRegistry()
    reg.add("hello")
    assert reg.get("hello") == "hello"


def test_get_missing_returns_none():
    reg = StringRegistry()
    assert reg.get("nonexistent") is None


def test_all_empty():
    reg = StringRegistry()
    assert reg.all() == []


def test_all_returns_all_items():
    reg = StringRegistry()
    reg.add("a")
    reg.add("b")
    reg.add("c")
    items = reg.all()
    assert set(items) == {"a", "b", "c"}


def test_extend():
    reg = StringRegistry()
    reg.extend(["x", "y", "z"])
    assert reg.get("x") == "x"
    assert reg.get("y") == "y"
    assert reg.get("z") == "z"
    assert len(reg.all()) == 3


def test_overwrite_key():
    reg = StringRegistry()
    reg.add("key")
    reg.add("key")
    assert len(reg.all()) == 1


def test_cannot_instantiate_abc_directly():
    with pytest.raises(TypeError):
        RegistryABC()