"""Tests for ComponentRegistry."""

# pylint: disable=missing-function-docstring,missing-class-docstring,protected-access,unused-argument

import pytest

from reme.components.base_component import BaseComponent
from reme.components.component_registry import ComponentRegistry, R, create_application_registry
from reme.enumeration import ComponentEnum


class _DummyComponent(BaseComponent):
    component_type = ComponentEnum.FILE_CHUNKER


class _AnotherComponent(BaseComponent):
    component_type = ComponentEnum.KEYWORD_INDEX


class _NoComponentType:
    pass


class _BaseComponentType(BaseComponent):
    component_type = ComponentEnum.BASE


# -- register & get -----------------------------------------------------------


def test_register_direct_with_explicit_name():
    reg = ComponentRegistry()
    reg.register(_DummyComponent, "my_parser")
    assert reg.get(ComponentEnum.FILE_CHUNKER, "my_parser") is _DummyComponent


def test_register_direct_defaults_to_class_name():
    reg = ComponentRegistry()
    reg.register(_DummyComponent)
    assert reg.get(ComponentEnum.FILE_CHUNKER, "_DummyComponent") is _DummyComponent


def test_register_decorator():
    reg = ComponentRegistry()

    @reg.register("alias")
    class MyParser(BaseComponent):
        component_type = ComponentEnum.FILE_CHUNKER

    assert reg.get(ComponentEnum.FILE_CHUNKER, "alias") is MyParser


def test_register_rejects_missing_component_type():
    reg = ComponentRegistry()
    with pytest.raises(TypeError, match="component_type"):
        reg.register(_NoComponentType, "bad")


def test_register_plugin_defined_component_type():
    reg = ComponentRegistry()

    class PluginComponent(BaseComponent):
        component_type = "example.reranker"

    reg.register(PluginComponent, "cross_encoder")

    assert reg.get("example.reranker", "cross_encoder") is PluginComponent
    assert reg.get_all("example.reranker") == {"cross_encoder": PluginComponent}


def test_register_rejects_unsafe_plugin_component_type():
    reg = ComponentRegistry()

    class UnsafePluginComponent(BaseComponent):
        component_type = "../outside"

    with pytest.raises(TypeError, match="component_type"):
        reg.register(UnsafePluginComponent, "unsafe")


def test_register_rejects_empty_name():
    reg = ComponentRegistry()
    with pytest.raises(ValueError, match="empty"):
        reg._do_register(_DummyComponent, "")


def test_register_rejects_non_class_non_string():
    reg = ComponentRegistry()
    with pytest.raises(TypeError, match="Expected a class or string"):
        reg.register(42)


# -- get_all ------------------------------------------------------------------


def test_get_all_returns_copy():
    reg = ComponentRegistry()
    reg.register(_DummyComponent, "a")
    reg.register(_AnotherComponent, "b")

    parsers = reg.get_all(ComponentEnum.FILE_CHUNKER)
    assert parsers == {"a": _DummyComponent}

    indexes = reg.get_all(ComponentEnum.KEYWORD_INDEX)
    assert indexes == {"b": _AnotherComponent}

    # Mutating the copy doesn't affect the registry.
    parsers["hacked"] = _DummyComponent
    assert "hacked" not in reg.get_all(ComponentEnum.FILE_CHUNKER)


def test_get_all_unknown_type_returns_empty():
    reg = ComponentRegistry()
    assert not reg.get_all(ComponentEnum.AS_LLM)


# -- get (miss) ---------------------------------------------------------------


def test_get_nonexistent_returns_none():
    reg = ComponentRegistry()
    assert reg.get(ComponentEnum.FILE_CHUNKER, "nope") is None


# -- unregister ---------------------------------------------------------------


def test_unregister_existing():
    reg = ComponentRegistry()
    reg.register(_DummyComponent, "x")
    assert reg.unregister(ComponentEnum.FILE_CHUNKER, "x") is True
    assert reg.get(ComponentEnum.FILE_CHUNKER, "x") is None


def test_unregister_missing_returns_false():
    reg = ComponentRegistry()
    assert reg.unregister(ComponentEnum.FILE_CHUNKER, "nope") is False


# -- clear --------------------------------------------------------------------


def test_clear():
    reg = ComponentRegistry()
    reg.register(_DummyComponent, "a")
    reg.register(_AnotherComponent, "b")
    reg.clear()
    assert not reg.get_all(ComponentEnum.FILE_CHUNKER)
    assert not reg.get_all(ComponentEnum.KEYWORD_INDEX)


def test_builtin_registry_is_frozen_after_package_bootstrap():
    assert R.frozen is True
    with pytest.raises(RuntimeError, match="frozen"):
        R.register(_DummyComponent, "runtime-mutation")


def test_application_registry_copy_remains_mutable():
    reg = create_application_registry()

    assert reg.frozen is False
    reg.register(_DummyComponent, "runtime-component")
    assert reg.get(ComponentEnum.FILE_CHUNKER, "runtime-component") is _DummyComponent
    assert R.get(ComponentEnum.FILE_CHUNKER, "runtime-component") is None


if __name__ == "__main__":
    print("\n=== ComponentRegistry Tests ===")
    test_register_direct_with_explicit_name()
    test_register_direct_defaults_to_class_name()
    test_register_decorator()
    test_register_rejects_missing_component_type()
    test_register_rejects_empty_name()
    test_register_rejects_non_class_non_string()
    test_get_all_returns_copy()
    test_get_all_unknown_type_returns_empty()
    test_get_nonexistent_returns_none()
    test_unregister_existing()
    test_unregister_missing_returns_false()
    test_clear()
    print("\n所有测试通过!")