"""Tests for data synchronization module.

Tests the sync module's full/incremental sync logic for daily data:
- Full sync when local data doesn't exist (from 20180101)
- Incremental sync when local data exists (from last_date + 1)
- Data integrity validation
"""

import pytest
import pandas as pd
from unittest.mock import Mock, patch, MagicMock
from datetime import datetime, timedelta

from src.data.sync import (
    DataSync,
    sync_all,
    get_today_date,
    get_next_date,
    DEFAULT_START_DATE,
)
from src.data.storage import Storage
from src.data.client import TushareClient


class TestDateUtilities:
    """Test date utility functions."""

    def test_get_today_date_format(self):
        """Test today date is in YYYYMMDD format."""
        result = get_today_date()
        assert len(result) == 8
        assert result.isdigit()

    def test_get_next_date(self):
        """Test getting next date."""
        result = get_next_date("20240101")
        assert result == "20240102"

    def test_get_next_date_year_end(self):
        """Test getting next date across year boundary."""
        result = get_next_date("20241231")
        assert result == "20250101"

    def test_get_next_date_month_end(self):
        """Test getting next date across month boundary."""
        result = get_next_date("20240131")
        assert result == "20240201"


class TestDataSync:
    """Test DataSync class functionality."""

    @pytest.fixture
    def mock_storage(self):
        """Create a mock storage instance."""
        storage = Mock(spec=Storage)
        storage.exists = Mock(return_value=False)
        storage.load = Mock(return_value=pd.DataFrame())
        storage.save = Mock(return_value={"status": "success", "rows": 0})
        return storage

    @pytest.fixture
    def mock_client(self):
        """Create a mock client instance."""
        return Mock(spec=TushareClient)

    def test_get_all_stock_codes_from_daily(self, mock_storage):
        """Test getting stock codes from daily data."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage

            mock_storage.load.return_value = pd.DataFrame(
                {
                    "ts_code": ["000001.SZ", "000001.SZ", "600000.SH"],
                }
            )

            codes = sync.get_all_stock_codes()

            assert len(codes) == 2
            assert "000001.SZ" in codes
            assert "600000.SH" in codes

    def test_get_all_stock_codes_fallback(self, mock_storage):
        """Test fallback to stock_basic when daily is empty."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage

            # First call (daily) returns empty, second call (stock_basic) returns data
            mock_storage.load.side_effect = [
                pd.DataFrame(),  # daily empty
                pd.DataFrame({"ts_code": ["000001.SZ", "600000.SH"]}),  # stock_basic
            ]

            codes = sync.get_all_stock_codes()

            assert len(codes) == 2

    def test_get_global_last_date(self, mock_storage):
        """Test getting global last date."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage

            mock_storage.load.return_value = pd.DataFrame(
                {
                    "ts_code": ["000001.SZ", "600000.SH"],
                    "trade_date": ["20240102", "20240103"],
                }
            )

            last_date = sync.get_global_last_date()
            assert last_date == "20240103"

    def test_get_global_last_date_empty(self, mock_storage):
        """Test getting last date from empty storage."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage

            mock_storage.load.return_value = pd.DataFrame()

            last_date = sync.get_global_last_date()
            assert last_date is None

    def test_sync_single_stock(self, mock_storage):
        """Test syncing a single stock."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            with patch(
                "src.data.sync.get_daily",
                return_value=pd.DataFrame(
                    {
                        "ts_code": ["000001.SZ"],
                        "trade_date": ["20240102"],
                    }
                ),
            ):
                sync = DataSync()
                sync.storage = mock_storage

                result = sync.sync_single_stock(
                    ts_code="000001.SZ",
                    start_date="20240101",
                    end_date="20240102",
                )

                assert isinstance(result, pd.DataFrame)
                assert len(result) == 1

    def test_sync_single_stock_empty(self, mock_storage):
        """Test syncing a stock with no data."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            with patch("src.data.sync.get_daily", return_value=pd.DataFrame()):
                sync = DataSync()
                sync.storage = mock_storage

                result = sync.sync_single_stock(
                    ts_code="INVALID.SZ",
                    start_date="20240101",
                    end_date="20240102",
                )

                assert result.empty


class TestSyncAll:
    """Test sync_all function."""

    def test_full_sync_mode(self, mock_storage):
        """Test full sync mode when force_full=True."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            with patch("src.data.sync.get_daily", return_value=pd.DataFrame()):
                sync = DataSync()
                sync.storage = mock_storage
                sync.sync_single_stock = Mock(return_value=pd.DataFrame())

                mock_storage.load.return_value = pd.DataFrame(
                    {
                        "ts_code": ["000001.SZ"],
                    }
                )

                result = sync.sync_all(force_full=True)

                # Verify sync_single_stock was called with default start date
                sync.sync_single_stock.assert_called_once()
                call_args = sync.sync_single_stock.call_args
                assert call_args[1]["start_date"] == DEFAULT_START_DATE

    def test_incremental_sync_mode(self, mock_storage):
        """Test incremental sync mode when data exists."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage
            sync.sync_single_stock = Mock(return_value=pd.DataFrame())

            # Mock existing data with last date
            mock_storage.load.side_effect = [
                pd.DataFrame(
                    {
                        "ts_code": ["000001.SZ"],
                        "trade_date": ["20240102"],
                    }
                ),  # get_all_stock_codes
                pd.DataFrame(
                    {
                        "ts_code": ["000001.SZ"],
                        "trade_date": ["20240102"],
                    }
                ),  # get_global_last_date
            ]

            result = sync.sync_all(force_full=False)

            # Verify sync_single_stock was called with next date
            sync.sync_single_stock.assert_called_once()
            call_args = sync.sync_single_stock.call_args
            assert call_args[1]["start_date"] == "20240103"

    def test_manual_start_date(self, mock_storage):
        """Test sync with manual start date."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage
            sync.sync_single_stock = Mock(return_value=pd.DataFrame())

            mock_storage.load.return_value = pd.DataFrame(
                {
                    "ts_code": ["000001.SZ"],
                }
            )

            result = sync.sync_all(force_full=False, start_date="20230601")

            sync.sync_single_stock.assert_called_once()
            call_args = sync.sync_single_stock.call_args
            assert call_args[1]["start_date"] == "20230601"

    def test_no_stocks_found(self, mock_storage):
        """Test sync when no stocks are found."""
        with patch("src.data.sync.Storage", return_value=mock_storage):
            sync = DataSync()
            sync.storage = mock_storage

            mock_storage.load.return_value = pd.DataFrame()

            result = sync.sync_all()

            assert result == {}


class TestSyncAllConvenienceFunction:
    """Test sync_all convenience function."""

    def test_sync_all_function(self):
        """Test sync_all convenience function."""
        with patch("src.data.sync.DataSync") as MockSync:
            mock_instance = Mock()
            mock_instance.sync_all.return_value = {}
            MockSync.return_value = mock_instance

            result = sync_all(force_full=True)

            MockSync.assert_called_once()
            mock_instance.sync_all.assert_called_once_with(
                force_full=True,
                start_date=None,
                end_date=None,
            )


if __name__ == "__main__":
    pytest.main([__file__, "-v"])