"""Test alpha_lab module - AlphaLab session management."""
import sys
import os
_VNPY_SRC = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "vnpy_v4.4.0"))
sys.path.insert(0, _VNPY_SRC)

from unittest.mock import Mock, patch
import tempfile


def test_builtin_factors_registered_on_import():
    """Test that importing sanguo_factor registers built-in factors (Root cause A fix)."""
    # Reimport to ensure registration runs
    import importlib
    import sanguo_factor
    importlib.reload(sanguo_factor)

    from sanguo_factor.registry import get_factor

    # Verify built-in factors are registered
    ma5_factor = get_factor("ma5")
    assert ma5_factor is not None, "ma5 factor not registered after import"
    assert ma5_factor["expression"] == "ts_mean(close, 5)"
    assert ma5_factor["category"] == "builtin"

    # Verify other built-in factors
    assert get_factor("ma10") is not None, "ma10 factor not registered"
    assert get_factor("ma20") is not None, "ma20 factor not registered"
    assert get_factor("vol_ma5") is not None, "vol_ma5 factor not registered"


def test_alpha_lab_session_init():
    """Test AlphaLabSession initialization without calling real __init__."""
    from pathlib import Path
    from sanguo_factor.alpha_lab import AlphaLabSession

    with tempfile.TemporaryDirectory() as tmpdir:
        lab_path = str(Path(tmpdir) / "alpha_lab")
        # Patch __init__ to skip AlphaLab import
        with patch.object(AlphaLabSession, "__init__", lambda self, lab_path: None):
            session = AlphaLabSession(lab_path=lab_path)
            session.lab_path = lab_path
            assert session.lab_path == lab_path


def test_load_symbols_calls_read_db_daily():
    """Test that load_symbols method exists on AlphaLabSession."""
    from pathlib import Path
    from sanguo_factor.alpha_lab import AlphaLabSession

    with tempfile.TemporaryDirectory() as tmpdir:
        lab_path = str(Path(tmpdir) / "alpha_lab")
        # Patch __init__ to skip AlphaLab import
        with patch.object(AlphaLabSession, "__init__", lambda self, lab_path: setattr(self, "lab_path", lab_path)), \
             patch.object(AlphaLabSession, "load_symbols"):
            session = AlphaLabSession(lab_path=lab_path)
            # Verify load_symbols method exists
            assert hasattr(session, "load_symbols")


def test_compute_factors_calls_prepare_and_fetch(tmp_path):
    """Test compute_factors calls AlphaDataset methods correctly.

    Requires polars - runs in container, skips locally.
    """
    import pytest
    pytest.importorskip("polars")
    # vnpy.alpha 仅 vnpy_v4.4.0 源码提供（容器内 sys.path 引用）；本地 pip 装的 vnpy 无此子模块
    try:
        import vnpy.alpha  # noqa: F401
    except ImportError:
        pytest.skip("vnpy.alpha 仅容器内可用（vnpy_v4.4.0 源码）")

    from pathlib import Path
    from datetime import datetime
    from unittest.mock import MagicMock
    from sanguo_factor.alpha_lab import AlphaLabSession
    import polars as pl

    # Create mock bar data
    mock_bar = MagicMock()
    mock_bar.vt_symbol = "600000.SSE"
    mock_bar.datetime = datetime(2024, 1, 1)
    mock_bar.open_price = 1.0
    mock_bar.high_price = 1.0
    mock_bar.low_price = 1.0
    mock_bar.close_price = 1.0
    mock_bar.volume = 1
    mock_bar.turnover = 0
    mock_bar.open_interest = 0

    # Mock AlphaLab session initialization
    with patch("vnpy.alpha.lab.AlphaLab"), \
         patch("sanguo_data.datareader.read_db_daily") as mock_read, \
         patch("sanguo_factor.data_adapter.save_alpha_lab_data"), \
         patch("sanguo_factor.data_adapter.convert_bars_to_alpha_df") as mock_convert, \
         patch("sanguo_factor.registry.get_factor") as mock_get_factor, \
         patch("vnpy.alpha.dataset.AlphaDataset") as mock_dataset_class:

        # Setup mock returns
        mock_read.return_value = [mock_bar]
        mock_get_factor.return_value = {"expression": "ts_mean(close,5)"}

        # Create mock AlphaDataset instance
        mock_dataset = MagicMock()
        mock_dataset.fetch_raw.return_value = pl.DataFrame({
            "datetime": [],
            "vt_symbol": [],
            "ma5": []
        })
        mock_dataset_class.return_value = mock_dataset

        # Create DataFrame for convert_bars_to_alpha_df
        # The code will localize the datetime column to Asia/Shanghai, so the mock needs to return a DataFrame with naive datetime
        initial_df = pl.DataFrame({
            "vt_symbol": ["600000.SSE"],
            "datetime": [datetime(2024, 1, 1)],
            "open": [1.0],
            "high": [1.0],
            "low": [1.0],
            "close": [1.0],
            "volume": [1.0],
            "turnover": [0.0],
            "open_interest": [0.0]
        })
        mock_convert.return_value = initial_df

        # Create session and load symbols
        lab_path = str(tmp_path / "alpha_lab")
        session = AlphaLabSession(lab_path=lab_path)
        session.load_symbols(["600000"], "2024-01-01", "2024-06-30", cfg=MagicMock())

        # Compute factors
        df = session.compute_factors(
            ["ma5"],
            ("2024-01-01", "2024-04-30"),
            ("2024-05-01", "2024-05-15"),
            ("2024-05-16", "2024-06-30")
        )

        # Verify AlphaDataset was created with Asia/Shanghai-aware periods
        from zoneinfo import ZoneInfo
        _SH = ZoneInfo("Asia/Shanghai")

        # The fix: compute_factors should convert period strings to Asia/Shanghai-aware datetimes
        expected_train_period = (datetime(2024, 1, 1, tzinfo=_SH), datetime(2024, 4, 30, tzinfo=_SH))
        expected_valid_period = (datetime(2024, 5, 1, tzinfo=_SH), datetime(2024, 5, 15, tzinfo=_SH))
        expected_test_period = (datetime(2024, 5, 16, tzinfo=_SH), datetime(2024, 6, 30, tzinfo=_SH))

        # Check that AlphaDataset was called once (don't compare DataFrames to avoid polars comparison issues)
        assert mock_dataset_class.call_count == 1
        call_args = mock_dataset_class.call_args
        # Verify the periods are correct
        assert call_args[0][1] == expected_train_period
        assert call_args[0][2] == expected_valid_period
        assert call_args[0][3] == expected_test_period

        # Verify add_feature was called for the factor
        mock_dataset.add_feature.assert_called_once_with("ma5", "ts_mean(close,5)")

        # Verify prepare_data was called
        mock_dataset.prepare_data.assert_called_once_with(max_workers=1)

        # Verify fetch_raw was called
        assert mock_dataset.fetch_raw.called

        # Verify return value is a DataFrame
        assert isinstance(df, pl.DataFrame)


def test_compute_factors_passes_aware_periods_to_alpha_dataset(tmp_path):
    """Test that compute_factors converts period strings to Asia/Shanghai-aware datetimes.

    This ensures vnpy.alpha's to_datetime() preserves timezone awareness,
    preventing SchemaError when comparing aware datetime column with naive literals.

    Requires polars - runs in container, skips locally.
    """
    import pytest
    pytest.importorskip("polars")
    # vnpy.alpha 仅 vnpy_v4.4.0 源码提供（容器内 sys.path 引用）；本地 pip 装的 vnpy 无此子模块
    try:
        import vnpy.alpha  # noqa: F401
    except ImportError:
        pytest.skip("vnpy.alpha 仅容器内可用（vnpy_v4.4.0 源码）")

    from pathlib import Path
    from datetime import datetime
    from unittest.mock import MagicMock, call
    from zoneinfo import ZoneInfo
    from sanguo_factor.alpha_lab import AlphaLabSession
    import polars as pl

    # Create mock bar data
    mock_bar = MagicMock()
    mock_bar.vt_symbol = "600000.SSE"
    mock_bar.datetime = datetime(2024, 1, 1)
    mock_bar.open_price = 1.0
    mock_bar.high_price = 1.0
    mock_bar.low_price = 1.0
    mock_bar.close_price = 1.0
    mock_bar.volume = 1
    mock_bar.turnover = 0
    mock_bar.open_interest = 0

    # Mock AlphaLab session initialization
    with patch("vnpy.alpha.lab.AlphaLab"), \
         patch("sanguo_data.datareader.read_db_daily") as mock_read, \
         patch("sanguo_factor.data_adapter.save_alpha_lab_data"), \
         patch("sanguo_factor.data_adapter.convert_bars_to_alpha_df") as mock_convert, \
         patch("sanguo_factor.registry.get_factor") as mock_get_factor, \
         patch("vnpy.alpha.dataset.AlphaDataset") as mock_dataset_class:

        # Setup mock returns
        mock_read.return_value = [mock_bar]
        mock_get_factor.return_value = {"expression": "ts_mean(close,5)"}

        # Create mock AlphaDataset instance
        mock_dataset = MagicMock()
        mock_dataset.fetch_raw.return_value = pl.DataFrame({
            "datetime": [],
            "vt_symbol": [],
            "ma5": []
        })
        mock_dataset_class.return_value = mock_dataset

        # Create DataFrame for convert_bars_to_alpha_df
        # The code will localize the datetime column to Asia/Shanghai, so the mock needs to return a DataFrame with naive datetime
        initial_df = pl.DataFrame({
            "vt_symbol": ["600000.SSE"],
            "datetime": [datetime(2024, 1, 1)],
            "open": [1.0],
            "high": [1.0],
            "low": [1.0],
            "close": [1.0],
            "volume": [1.0],
            "turnover": [0.0],
            "open_interest": [0.0]
        })
        mock_convert.return_value = initial_df

        # Create session and load symbols
        lab_path = str(tmp_path / "alpha_lab")
        session = AlphaLabSession(lab_path=lab_path)
        session.load_symbols(["600000"], "2024-01-01", "2024-06-30", cfg=MagicMock())

        # Test with string periods (should be converted to aware datetimes)
        session.compute_factors(
            ["ma5"],
            ("2024-01-01", "2024-04-30"),  # String periods
            ("2024-05-01", "2024-05-15"),
            ("2024-05-16", "2024-06-30")
        )

        # Verify AlphaDataset was called with Asia/Shanghai-aware datetimes
        call_args = mock_dataset_class.call_args
        _, train_period, valid_period, test_period = call_args[0]

        # Check that all period boundaries are datetime objects with Asia/Shanghai timezone
        _SH = ZoneInfo("Asia/Shanghai")
        for period_name, period in [("train", train_period), ("valid", valid_period), ("test", test_period)]:
            start, end = period
            assert isinstance(start, datetime), f"{period_name} period start should be datetime object, got {type(start)}"
            assert isinstance(end, datetime), f"{period_name} period end should be datetime object, got {type(end)}"
            assert start.tzinfo == _SH, f"{period_name} period start should be Asia/Shanghai-aware, got {start.tzinfo}"
            assert end.tzinfo == _SH, f"{period_name} period end should be Asia/Shanghai-aware, got {end.tzinfo}"


def test_loaded_bars_cache_eviction(tmp_path):
    """Test that _loaded_bars cache evicts oldest entries when exceeding cap."""
    from datetime import datetime
    from unittest.mock import MagicMock
    from sanguo_factor.alpha_lab import AlphaLabSession, _MAX_CACHED_SYMBOLS
    from collections import OrderedDict

    # Create mock bar data
    def create_mock_bar(symbol: str):
        mock_bar = MagicMock()
        mock_bar.vt_symbol = symbol
        mock_bar.datetime = datetime(2024, 1, 1)
        mock_bar.open_price = 1.0
        mock_bar.high_price = 1.0
        mock_bar.low_price = 1.0
        mock_bar.close_price = 1.0
        mock_bar.volume = 1
        mock_bar.turnover = 0
        mock_bar.open_interest = 0
        return [mock_bar]

    # Create a mock session and manually test cache eviction logic
    lab_path = str(tmp_path / "alpha_lab")

    # Manually initialize the session to avoid vnpy.alpha import
    import sanguo_factor.alpha_lab as alpha_lab_module
    original_init = AlphaLabSession.__init__

    def mock_init(self, lab_path):
        self.lab_path = lab_path
        self._loaded_symbols = []
        self._loaded_bars = OrderedDict()

    # Temporarily replace __init__ and test the cache logic
    AlphaLabSession.__init__ = mock_init

    try:
        session = AlphaLabSession(lab_path=lab_path)

        # Directly simulate the cache eviction logic from load_symbols
        symbols_to_load = [f"60000{i}.SSE" for i in range(_MAX_CACHED_SYMBOLS + 10)]

        for i, symbol in enumerate(symbols_to_load):
            # Simulate adding symbol to cache (from load_symbols logic)
            bars = create_mock_bar(symbol)

            # Add symbol to _loaded_symbols
            if symbol not in session._loaded_symbols:
                session._loaded_symbols.append(symbol)

            # Add or update symbol in cache (LRU logic)
            if symbol in session._loaded_bars:
                del session._loaded_bars[symbol]
            session._loaded_bars[symbol] = bars

            # Enforce cache cap - evict oldest symbol if exceeded
            while len(session._loaded_bars) > _MAX_CACHED_SYMBOLS:
                oldest_symbol = next(iter(session._loaded_bars))
                del session._loaded_bars[oldest_symbol]
                if oldest_symbol in session._loaded_symbols:
                    session._loaded_symbols.remove(oldest_symbol)

            # Check that cache size never exceeds cap
            assert len(session._loaded_bars) <= _MAX_CACHED_SYMBOLS, \
                f"Cache exceeded cap at iteration {i}: {len(session._loaded_bars)} > {_MAX_CACHED_SYMBOLS}"

        # Final check: cache should be exactly at cap
        assert len(session._loaded_bars) == _MAX_CACHED_SYMBOLS

        # Verify that the oldest symbols were evicted (first loaded symbols should be gone)
        oldest_symbols = symbols_to_load[:10]  # First 10 symbols should be evicted
        for symbol in oldest_symbols:
            assert symbol not in session._loaded_bars, f"Oldest symbol {symbol} should have been evicted"

        # Verify that the newest symbols are still in cache
        newest_symbols = symbols_to_load[-10:]  # Last 10 symbols should be present
        for symbol in newest_symbols:
            assert symbol in session._loaded_bars, f"Newest symbol {symbol} should be in cache"

    finally:
        # Restore original __init__
        AlphaLabSession.__init__ = original_init