import { Source, Layer } from 'react-map-gl/maplibre';
import { KOREA_EEZ_BOUNDARY, KOREA_CHINA_PMZ, NLL_WEST_SEA, NLL_EAST_SEA } from '../services/koreaEez';
import type { FillLayerSpecification, LineLayerSpecification } from 'maplibre-gl';

// Convert [lat, lng][] to GeoJSON [lng, lat][] ring
function toRing(coords: [number, number][]): [number, number][] {
  return coords.map(([lat, lng]) => [lng, lat]);
}

function toLineCoords(coords: [number, number][]): [number, number][] {
  return coords.map(([lat, lng]) => [lng, lat]);
}

const eezGeoJSON: GeoJSON.FeatureCollection = {
  type: 'FeatureCollection',
  features: [
    // EEZ 경계 폴리곤
    {
      type: 'Feature',
      properties: { type: 'eez' },
      geometry: {
        type: 'Polygon',
        coordinates: [toRing(KOREA_EEZ_BOUNDARY)],
      },
    },
    // 한중 잠정조치수역
    {
      type: 'Feature',
      properties: { type: 'pmz' },
      geometry: {
        type: 'Polygon',
        coordinates: [toRing(KOREA_CHINA_PMZ)],
      },
    },
    // 서해 NLL
    {
      type: 'Feature',
      properties: { type: 'nll' },
      geometry: {
        type: 'LineString',
        coordinates: toLineCoords(NLL_WEST_SEA),
      },
    },
    // 동해 NLL
    {
      type: 'Feature',
      properties: { type: 'nll' },
      geometry: {
        type: 'LineString',
        coordinates: toLineCoords(NLL_EAST_SEA),
      },
    },
  ],
};

const eezFillStyle: FillLayerSpecification = {
  id: 'eez-fill',
  type: 'fill',
  source: 'eez-source',
  filter: ['==', ['get', 'type'], 'eez'],
  paint: {
    'fill-color': '#3b82f6',
    'fill-opacity': 0.06,
  },
};

const eezLineStyle: LineLayerSpecification = {
  id: 'eez-line',
  type: 'line',
  source: 'eez-source',
  filter: ['==', ['get', 'type'], 'eez'],
  paint: {
    'line-color': '#3b82f6',
    'line-width': 1.5,
    'line-dasharray': [4, 3],
    'line-opacity': 0.6,
  },
};

const pmzFillStyle: FillLayerSpecification = {
  id: 'pmz-fill',
  type: 'fill',
  source: 'eez-source',
  filter: ['==', ['get', 'type'], 'pmz'],
  paint: {
    'fill-color': '#eab308',
    'fill-opacity': 0.08,
  },
};

const pmzLineStyle: LineLayerSpecification = {
  id: 'pmz-line',
  type: 'line',
  source: 'eez-source',
  filter: ['==', ['get', 'type'], 'pmz'],
  paint: {
    'line-color': '#eab308',
    'line-width': 1.2,
    'line-dasharray': [3, 2],
    'line-opacity': 0.5,
  },
};

const nllLineStyle: LineLayerSpecification = {
  id: 'nll-line',
  type: 'line',
  source: 'eez-source',
  filter: ['==', ['get', 'type'], 'nll'],
  paint: {
    'line-color': '#ef4444',
    'line-width': 2,
    'line-dasharray': [6, 4],
    'line-opacity': 0.7,
  },
};

export function EezLayer() {
  return (
    <Source id="eez-source" type="geojson" data={eezGeoJSON}>
      <Layer {...eezFillStyle} />
      <Layer {...eezLineStyle} />
      <Layer {...pmzFillStyle} />
      <Layer {...pmzLineStyle} />
      <Layer {...nllLineStyle} />
    </Source>
  );
}
