import io
import pytest
from unittest.mock import MagicMock, patch, mock_open
from src.core.file_parser import GpxParser, WorkoutData, WorkoutMetadata
from datetime import datetime, timedelta


@pytest.fixture
def mock_gpxpy_parse():
    with patch("gpxpy.parse") as mock_parse:
        mock_gpx = MagicMock()
        mock_parse.return_value = mock_gpx

        # Mock GPX data
        mock_gpx.time = datetime(2023, 1, 1, 10, 0, 0)
        mock_gpx.get_moving_data.return_value.moving_time = 3600

        mock_point1 = MagicMock()
        mock_point1.time = datetime(2023, 1, 1, 10, 0, 0)
        mock_point1.latitude = 40.0
        mock_point1.longitude = -105.0
        mock_point1.elevation = 1600.0

        mock_point2 = MagicMock()
        mock_point2.time = datetime(2023, 1, 1, 10, 1, 0)
        mock_point2.latitude = 40.1
        mock_point2.longitude = -105.1
        mock_point2.elevation = 1610.0

        mock_segment = MagicMock()
        mock_segment.points = [mock_point1, mock_point2]

        mock_track = MagicMock()
        mock_track.segments = [mock_segment]

        mock_gpx.tracks = [mock_track]

        yield mock_parse


def test_gpx_parser_parse_method_returns_workout_data(mock_gpxpy_parse):
    # Mock the open function as well, since GpxParser directly opens the file
    with patch("builtins.open", mock_open(read_data="<gpx></gpx>")):
        parser = GpxParser()
        workout_data = parser.parse(io.BytesIO(b"<gpx></gpx>"))

        mock_gpxpy_parse.assert_called_once()  # gpxpy.parse is called

        assert isinstance(workout_data, WorkoutData)
        assert isinstance(workout_data.metadata, WorkoutMetadata)
        assert workout_data.metadata.file_type == "GPX"
        assert workout_data.metadata.start_time == datetime(2023, 1, 1, 10, 0, 0)
        assert workout_data.metadata.duration == timedelta(seconds=3600)
        assert not workout_data.time_series_data.empty
        assert "latitude" in workout_data.time_series_data.columns
        assert "longitude" in workout_data.time_series_data.columns
        assert "elevation" in workout_data.time_series_data.columns