src/data/extractors/soil.py

"""
Soil properties extractor.
Single Responsibility: Extract soil-related features.
"""
import geopandas as gpd
from typing import Dict, Any
from .base import BaseFeatureExtractor


class SoilExtractor(BaseFeatureExtractor):
    """
    Extracts soil properties from spatial datasets.

    Features:
    - Soil type, texture (sand, silt, clay %)
    - Hydraulic conductivity
    - Available water capacity
    - Porosity
    - Soil depth
    """

    def extract(self, basin_gdf: gpd.GeoDataFrame) -> Dict[str, Any]:
        """
        Extract soil features from basin.

        Args:
            basin_gdf: GeoDataFrame with basin geometry

        Returns:
            Dictionary with soil features
        """
        if not self.validate_inputs(basin_gdf):
            raise ValueError("Invalid basin GeoDataFrame")

        # Placeholder for soil data extraction
        # Would involve spatial join with soil databases (e.g., SoilGrids, national datasets)
        return {
            "soil_sand_pct": None,
            "soil_silt_pct": None,
            "soil_clay_pct": None,
            "hydraulic_conductivity": None,
            "available_water_capacity": None,
            "soil_porosity": None,
            "soil_depth_cm": None
        }

    def get_feature_names(self) -> list:
        """Get list of feature names."""
        return [
            "soil_sand_pct", "soil_silt_pct", "soil_clay_pct",
            "hydraulic_conductivity", "available_water_capacity",
            "soil_porosity", "soil_depth_cm"
        ]