import { IconLayer, TextLayer } from '@deck.gl/layers';
import type { PickingInfo, Layer } from '@deck.gl/core';
import { svgToDataUri } from '../../utils/svgToDataUri';
import { FONT_MONO } from '../../styles/fonts';
import {
  ME_ENERGY_HAZARD_FACILITIES,
  SUB_TYPE_META,
  layerKeyToSubType,
  layerKeyToCountry,
  type EnergyHazardFacility,
  type FacilitySubType,
} from '../../data/meEnergyHazardFacilities';

// LayerVisibility overseas key → countryKey mapping
const COUNTRY_KEY_TO_LAYER_KEY: Record<string, string> = {
  us: 'overseasUS',
  ir: 'overseasIran',
  ae: 'overseasUAE',
  sa: 'overseasSaudi',
  om: 'overseasOman',
  qa: 'overseasQatar',
  kw: 'overseasKuwait',
  iq: 'overseasIraq',
  bh: 'overseasBahrain',
  // il (Israel) is shown when meFacilities is true (no dedicated overseas key)
  il: 'meFacilities',
};

function isFacilityVisible(f: EnergyHazardFacility, layers: Record<string, boolean>): boolean {
  const countryLayerKey = COUNTRY_KEY_TO_LAYER_KEY[f.countryKey];
  if (!countryLayerKey || !layers[countryLayerKey]) return false;

  // Check sub-type toggle if present, otherwise fall through to country-level toggle
  // Sub-type keys: e.g. "irPower", "ilNuclear", "usOilTank"
  const subTypeKey = f.countryKey + capitalizeFirst(f.subType.replace('_', ''));
  if (subTypeKey in layers) return !!layers[subTypeKey];

  // Check category-level parent key: e.g. "irEnergy", "usHazard"
  const categoryKey = f.countryKey + capitalizeFirst(f.category);
  if (categoryKey in layers) return !!layers[categoryKey];

  // Fall back to country-level toggle
  return true;
}

function capitalizeFirst(s: string): string {
  return s.charAt(0).toUpperCase() + s.slice(1);
}

// Pre-build layer-key → subType entries from layerKeyToSubType/layerKeyToCountry
// for reference — the actual filter uses the above isFacilityVisible logic.
// Exported for re-use elsewhere if needed.
export { layerKeyToSubType, layerKeyToCountry };

export interface MELayerConfig {
  layers: Record<string, boolean>;
  sc: number;
  fs?: number;
  onPick: (facility: EnergyHazardFacility) => void;
}

function hexToRgba(hex: string, alpha = 255): [number, number, number, number] {
  const r = parseInt(hex.slice(1, 3), 16);
  const g = parseInt(hex.slice(3, 5), 16);
  const b = parseInt(hex.slice(5, 7), 16);
  return [r, g, b, alpha];
}

// ─── SVG icon functions ────────────────────────────────────────────────────────

function powerSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <path d="M13 5 L7 13 L12 13 L11 19 L17 11 L12 11 Z" fill="${color}" opacity="0.9"/>
  </svg>`;
}

function windSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <circle cx="12" cy="12" r="1.5" fill="${color}"/>
    <line x1="12" y1="10.5" x2="12" y2="5" stroke="${color}" stroke-width="1.2"/>
    <path d="M12 5 Q15 5 15 7 Q15 9 12 10.5" fill="${color}" opacity="0.7"/>
    <line x1="10.7" y1="11.25" x2="6" y2="8.5" stroke="${color}" stroke-width="1.2"/>
    <path d="M6 8.5 Q4 11 5.5 13 Q7 14.5 10.7 13" fill="${color}" opacity="0.7"/>
    <line x1="13.3" y1="12.75" x2="18" y2="15.5" stroke="${color}" stroke-width="1.2"/>
    <path d="M18 15.5 Q20 13 18.5 11 Q17 9.5 13.3 11" fill="${color}" opacity="0.7"/>
  </svg>`;
}

function nuclearSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <circle cx="12" cy="12" r="2" fill="${color}"/>
    <path d="M12 10 Q10 7 7 7 Q6 9 7 11 Q9 12 12 12" fill="${color}" opacity="0.7"/>
    <path d="M13.7 11 Q16 9 17 7 Q15 5 13 6 Q11 8 12 10" fill="${color}" opacity="0.7"/>
    <path d="M10.3 13 Q7 13 6 16 Q8 18 11 17 Q13 15 13.7 13" fill="${color}" opacity="0.7"/>
    <path d="M13.7 13 Q15 16 17 17 Q19 15 18 12 Q16 11 13.7 12" fill="${color}" opacity="0.7"/>
  </svg>`;
}

function thermalSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <rect x="5" y="11" width="14" height="7" rx="1" fill="${color}" opacity="0.6"/>
    <rect x="7" y="7" width="2" height="5" fill="${color}" opacity="0.6"/>
    <rect x="11" y="5" width="2" height="7" fill="${color}" opacity="0.6"/>
    <rect x="15" y="8" width="2" height="4" fill="${color}" opacity="0.6"/>
    <path d="M8 5 Q8.5 3.5 9 5 Q9.5 3 10 5" fill="none" stroke="${color}" stroke-width="0.8" opacity="0.8"/>
  </svg>`;
}

function petrochemSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <rect x="10" y="5" width="4" height="8" rx="1" fill="${color}" opacity="0.65"/>
    <ellipse cx="12" cy="14.5" rx="4.5" ry="2.5" fill="${color}" opacity="0.75"/>
    <line x1="7" y1="10" x2="10" y2="10" stroke="${color}" stroke-width="1"/>
    <line x1="14" y1="10" x2="17" y2="10" stroke="${color}" stroke-width="1"/>
    <path d="M7 10 Q5.5 13 8 15" fill="none" stroke="${color}" stroke-width="0.8"/>
  </svg>`;
}

function lngSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <line x1="9" y1="7" x2="9" y2="10" stroke="${color}" stroke-width="1.5"/>
    <line x1="12" y1="5" x2="12" y2="10" stroke="${color}" stroke-width="1.5"/>
    <line x1="15" y1="7" x2="15" y2="10" stroke="${color}" stroke-width="1.5"/>
    <line x1="7" y1="9" x2="17" y2="9" stroke="${color}" stroke-width="1"/>
    <ellipse cx="12" cy="15" rx="5" ry="3.5" fill="${color}" opacity="0.65"/>
    <line x1="12" y1="10" x2="12" y2="11.5" stroke="${color}" stroke-width="1"/>
  </svg>`;
}

function oilTankSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <ellipse cx="12" cy="8" rx="5" ry="2" fill="${color}" opacity="0.5"/>
    <rect x="7" y="8" width="10" height="8" fill="${color}" opacity="0.6"/>
    <ellipse cx="12" cy="16" rx="5" ry="2" fill="${color}" opacity="0.8"/>
    <line x1="9" y1="8" x2="9" y2="16" stroke="rgba(0,0,0,0.2)" stroke-width="0.5"/>
    <line x1="15" y1="8" x2="15" y2="16" stroke="rgba(0,0,0,0.2)" stroke-width="0.5"/>
  </svg>`;
}

function hazPortSvg(color: string, size: number): string {
  return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <circle cx="12" cy="12" r="10" fill="rgba(0,0,0,0.5)" stroke="${color}" stroke-width="1.2"/>
    <path d="M12 5 L20 18 L4 18 Z" fill="${color}" opacity="0.7"/>
    <line x1="12" y1="10" x2="12" y2="14" stroke="#fff" stroke-width="1.8" stroke-linecap="round"/>
    <circle cx="12" cy="16" r="1" fill="#fff"/>
  </svg>`;
}

const SUB_TYPE_SVG_FN: Record<FacilitySubType, (color: string, size: number) => string> = {
  power:     powerSvg,
  wind:      windSvg,
  nuclear:   nuclearSvg,
  thermal:   thermalSvg,
  petrochem: petrochemSvg,
  lng:       lngSvg,
  oil_tank:  oilTankSvg,
  haz_port:  hazPortSvg,
};

const iconCache = new Map<string, string>();

function getIconUrl(subType: FacilitySubType): string {
  if (!iconCache.has(subType)) {
    const color = SUB_TYPE_META[subType].color;
    iconCache.set(subType, svgToDataUri(SUB_TYPE_SVG_FN[subType](color, 64)));
  }
  return iconCache.get(subType)!;
}

export function createMEEnergyHazardLayers(config: MELayerConfig): Layer[] {
  const { layers, sc, onPick } = config;
  const fs = config.fs ?? 1;

  const visibleFacilities = ME_ENERGY_HAZARD_FACILITIES.filter(f =>
    isFacilityVisible(f, layers),
  );

  if (visibleFacilities.length === 0) return [];

  const iconLayer = new IconLayer<EnergyHazardFacility>({
    id: 'me-energy-hazard-icon',
    data: visibleFacilities,
    getPosition: (d) => [d.lng, d.lat],
    getIcon: (d) => ({ url: getIconUrl(d.subType), width: 64, height: 64, anchorX: 32, anchorY: 32 }),
    getSize: (d) => (d.category === 'hazard' ? 20 : 18) * sc,
    updateTriggers: { getSize: [sc] },
    pickable: true,
    onClick: (info: PickingInfo<EnergyHazardFacility>) => {
      if (info.object) onPick(info.object);
      return true;
    },
  });

  const labelLayer = new TextLayer<EnergyHazardFacility>({
    id: 'me-energy-hazard-label',
    data: visibleFacilities,
    getPosition: (d) => [d.lng, d.lat],
    getText: (d) => d.nameKo.length > 12 ? d.nameKo.slice(0, 12) + '..' : d.nameKo,
    getSize: 12 * sc * fs,
    updateTriggers: { getSize: [sc] },
    getColor: (d) => hexToRgba(SUB_TYPE_META[d.subType].color),
    getTextAnchor: 'middle',
    getAlignmentBaseline: 'top',
    getPixelOffset: [0, 12],
    fontFamily: FONT_MONO,
    fontWeight: 700,
    fontSettings: { sdf: true },
        outlineWidth: 3,
    outlineColor: [0, 0, 0, 255],
    billboard: false,
    characterSet: 'auto',
  });

  return [iconLayer, labelLayer];
}
