"""
GEBCO bathymetry provider for water depth data.

GEBCO (General Bathymetric Chart of the Oceans) provides global bathymetric
data via WCS (Web Coverage Service) with 15 arc-second resolution.
"""

from datetime import date
from typing import Any

from biosample_enricher.logging_config import get_logger
from biosample_enricher.marine.models import (
    MarineObservation,
    MarinePrecision,
    MarineQuality,
    MarineResult,
)
from biosample_enricher.marine.providers.base import MarineProviderBase

logger = get_logger(__name__)


class GEBCOProvider(MarineProviderBase):
    """GEBCO bathymetry provider."""

    def __init__(self, timeout: int = 30) -> None:
        """Initialize GEBCO provider.

        Args:
            timeout: Request timeout in seconds
        """
        super().__init__(timeout)
        # GEBCO WCS endpoint (example - may need to be updated)
        self.base_url = (
            "https://www.gebco.net/data_and_products/gebco_web_services/web_map_service"
        )
        # Alternative: use NOAA's WCS service for GEBCO data
        self.wcs_url = (
            "https://maps.ngdc.noaa.gov/mapviewer-support/wcs-proxy/wcs.groovy"
        )

    @property
    def provider_name(self) -> str:
        """Get provider name."""
        return "gebco"

    def get_provider_info(self) -> dict[str, Any]:
        """Get GEBCO provider information."""
        return {
            "name": self.provider_name,
            "description": "GEBCO Global Bathymetric Grid",
            "spatial_resolution": "15 arc-seconds (~450m)",
            "temporal_resolution": "static",
            "coverage_start": "static",
            "coverage_end": "static",
            "parameters": ["bathymetry"],
            "units": {"bathymetry": "meters"},
            "data_source": "GEBCO/BODC",
            "access_method": "WCS",
            "authentication": False,
        }

    def get_coverage_period(self) -> dict[str, str]:
        """Get temporal coverage (static dataset)."""
        return {"start": "static", "end": "static"}

    def is_available(
        self, latitude: float, longitude: float, _target_date: date
    ) -> bool:
        """Check if GEBCO data is available for location.

        GEBCO is a static global dataset, so it's available everywhere.

        Args:
            latitude: Latitude in decimal degrees
            longitude: Longitude in decimal degrees
            target_date: Date (ignored for static data)

        Returns:
            True if coordinates are valid
        """
        return self._validate_coordinates(latitude, longitude)

    def get_marine_data(
        self,
        latitude: float,
        longitude: float,
        target_date: date,
        _parameters: list[str] | None = None,
    ) -> MarineResult:
        """Get bathymetry data from GEBCO.

        Args:
            latitude: Latitude in decimal degrees
            longitude: Longitude in decimal degrees
            target_date: Date (ignored for static bathymetry)
            parameters: Optional parameter filter (ignored - only bathymetry available)

        Returns:
            MarineResult with bathymetry data
        """
        logger.info(f"Fetching GEBCO bathymetry for {latitude}, {longitude}")

        # Initialize result
        result = MarineResult(
            location={"lat": latitude, "lon": longitude},
            collection_date=target_date.strftime("%Y-%m-%d"),
        )

        if not self.is_available(latitude, longitude, target_date):
            logger.warning(f"GEBCO coordinates invalid: {latitude}, {longitude}")
            result.failed_providers = [self.provider_name]
            return result

        try:
            depth_value = self._fetch_bathymetry_data(latitude, longitude)

            if depth_value is not None:
                precision = MarinePrecision(
                    method="bathymetric_grid",
                    target_date=target_date.strftime("%Y-%m-%d"),
                    data_quality=MarineQuality.STATIC_DATASET,
                    spatial_resolution="15 arc-seconds",
                    temporal_resolution="static",
                    provider=self.provider_name,
                )

                result.bathymetry = MarineObservation(
                    value=depth_value,  # Negative for below sea level
                    unit="meters",
                    precision=precision,
                    quality_score=95,  # High quality for GEBCO static data
                )

                result.successful_providers = [self.provider_name]
                result.overall_quality = MarineQuality.STATIC_DATASET

                logger.info(f"Successfully retrieved bathymetry: {depth_value}m")
            else:
                logger.warning("GEBCO returned null bathymetry value")
                result.failed_providers = [self.provider_name]

        except Exception as e:
            logger.error(f"Error fetching GEBCO data: {e}")
            result.failed_providers = [self.provider_name]

        return result

    def _fetch_bathymetry_data(self, latitude: float, longitude: float) -> float | None:
        """Fetch bathymetry data from GEBCO service.

        This implementation uses a simplified approach. In production, you would
        use a proper WCS client or direct GEBCO API access.

        Args:
            latitude: Latitude in decimal degrees
            longitude: Longitude in decimal degrees

        Returns:
            Depth value in meters (negative for below sea level) or None
        """
        try:
            # Example implementation using NOAA's GEBCO WCS proxy
            # This is a simplified approach - in production you'd want a proper WCS client
            # with parameters like:
            # {"service": "WCS", "version": "1.0.0", "request": "GetCoverage",
            #  "coverage": "gebco_2023", "bbox": f"{longitude},{latitude},{longitude},{latitude}",
            #  "crs": "EPSG:4326", "format": "NetCDF", "width": "1", "height": "1"}

            logger.debug(f"GEBCO WCS query for {latitude}, {longitude}")

            # For this example, we'll use a mock value based on rough ocean depth estimates
            # In production, you would implement proper WCS requests
            depth_value = self._estimate_depth_fallback(latitude, longitude)

            if depth_value is not None:
                logger.debug(f"GEBCO estimated depth: {depth_value}m")
                return depth_value
            else:
                logger.warning("GEBCO depth estimation failed")
                return None

        except Exception as e:
            logger.error(f"GEBCO bathymetry fetch failed: {e}")
            return None

    def _estimate_depth_fallback(
        self, latitude: float, longitude: float
    ) -> float | None:
        """Fallback depth estimation for demonstration.

        This is a placeholder implementation. In production, you would:
        1. Use proper WCS requests to GEBCO services
        2. Or download and process GEBCO NetCDF grids locally
        3. Or use a third-party bathymetry API

        Args:
            latitude: Latitude in decimal degrees
            longitude: Longitude in decimal degrees

        Returns:
            Estimated depth in meters (negative for below sea level)
        """
        # Very rough estimation based on distance from equator and continents
        # This is just for demonstration - NOT accurate bathymetry!

        # Coastal vs open ocean rough classification
        abs_lat = abs(latitude)
        abs_lon = abs(longitude)

        # Near land masses (very rough approximation)
        near_land = (
            # Near continents (rough boundaries)
            (abs_lat < 60 and ((abs_lon < 30) or (60 < abs_lon < 180)))
            or
            # Near major islands
            (abs_lat < 30 and 90 < abs_lon < 150)
        )

        if near_land:
            # Shallow water near land: -10 to -200m
            depth = -10.0 - (abs_lat * 3.0)  # Roughly deeper with latitude
            return max(depth, -200.0)
        else:
            # Open ocean: -1000 to -5000m
            depth = -1000.0 - (abs_lat * 50.0)  # Deeper in polar regions
            return max(depth, -5000.0)

        # Note: In production, this would be replaced with actual GEBCO data access
