"""Tests for providers_hook bridge — 验证 Bridge 正确从 fileLoc 加载，不 fallback。"""

import importlib
import inspect
import io
import sys

import pytest

from loguru import logger


@pytest.fixture(autouse=True)
def _clean_providers_hook_cache():
    """每个用例前清除 providers_hook 缓存，避免交叉污染。"""
    for mod in list(sys.modules.keys()):
        if "providers_hook" in mod:
            del sys.modules[mod]


class TestBridgeLoadsFromFileLoc:
    """Bridge 应成功从 fileLoc 加载，不触发 WARNING。"""

    def test_no_warning_on_import(self):
        """导入 providers_hook 不应产生 WARNING 日志。"""
        # 捕获 loguru 输出
        logger.remove()
        buf = io.StringIO()
        logger.add(buf, format="{level} | {message}", level="DEBUG")

        import ocr_utils.hooks.providers_hook  # noqa: F811
        importlib.reload(ocr_utils.hooks.providers_hook)

        log_output = buf.getvalue()
        hook_lines = [l for l in log_output.split("\n") if "providers_hook" in l and l.strip()]

        warnings = [l for l in hook_lines if "WARNING" in l]
        assert not warnings, f"providers_hook 不应输出 WARNING: {warnings}"

        debugs = [l for l in hook_lines if "DEBUG" in l]
        assert any("loaded from fileLoc" in l for l in debugs), \
            f"应产生 'loaded from fileLoc' DEBUG 日志, 实际: {debugs}"

    def test_symbols_from_fileloc(self):
        """resolve_providers 和 apply_providers_to_session 应来自 fileLoc device_and_provider 模块。"""
        import ocr_utils.hooks.providers_hook
        importlib.reload(ocr_utils.hooks.providers_hook)

        hook = ocr_utils.hooks.providers_hook

        assert "device_and_provider" in hook.resolve_providers.__module__, \
            f"resolve_providers 来自 {hook.resolve_providers.__module__}, 期望 device_and_provider"
        assert "device_and_provider" in hook.apply_providers_to_session.__module__, \
            f"apply_providers_to_session 来自 {hook.apply_providers_to_session.__module__}, 期望 device_and_provider"

    def test_apply_providers_wrapper_signature(self):
        """apply_providers 包装函数签名应为 (model, config, session_paths)。"""
        import ocr_utils.hooks.providers_hook
        importlib.reload(ocr_utils.hooks.providers_hook)

        hook = ocr_utils.hooks.providers_hook

        sig = inspect.signature(hook.apply_providers)
        param_names = list(sig.parameters.keys())
        assert param_names == ["model", "config", "session_paths"], \
            f"期望签名 (model, config, session_paths), 实际: {param_names}"

    def test_default_providers_constants(self):
        """DEFAULT_CPU_PROVIDERS 和 DEFAULT_GPU_PROVIDERS 应正确导出。"""
        import ocr_utils.hooks.providers_hook
        importlib.reload(ocr_utils.hooks.providers_hook)

        hook = ocr_utils.hooks.providers_hook

        assert hook.DEFAULT_CPU_PROVIDERS == ["CPUExecutionProvider"]
        assert hook.DEFAULT_GPU_PROVIDERS == ["CUDAExecutionProvider", "CPUExecutionProvider"]