// Leaflet is loaded via CDN in index.html
// @ts-expect-error - Leaflet global
const L = window.L;

export interface MapMarker {
  id: string;
  lat: number;
  lng: number;
  label: string;
  dreadLevel: number; // 0-3
}

const LOCATIONS: Omit<MapMarker, 'dreadLevel'>[] = [
  { id: 'rosengard',  lat: 55.5894, lng: 13.0414, label: 'Källaren i Rosengård' },
  { id: 'varnhem',   lat: 55.5982, lng: 13.0058, label: 'Värnhemstorget' },
  { id: 'torso',     lat: 55.6130, lng: 12.9758, label: 'Turning Torso' },
  { id: 'oresund',   lat: 55.5789, lng: 12.9200, label: 'Øresundsbron' },
  { id: 'ribersborg',lat: 55.6063, lng: 12.9652, label: 'Ribersborgsstranden' },
  { id: 'davidshall',lat: 55.5963, lng: 13.0021, label: 'Davidshallsgatan' },
  { id: 'stortorget',lat: 55.6047, lng: 13.0038, label: 'Stortorget' },
];

type LeafletMap = ReturnType<typeof L.map>;
type LeafletMarker = ReturnType<typeof L.circleMarker>;

let map: LeafletMap | null = null;
const markers = new Map<string, LeafletMarker>();

function dreadColor(level: number): string {
  return ['#1a1a2e', '#4a1a4a', '#8b0a8b', '#cc00cc'][Math.min(level, 3)];
}

function dreadRadius(level: number): number {
  return [6, 10, 16, 24][Math.min(level, 3)];
}

export function initMap(containerId: string, onClick: (id: string) => void): void {
  if (!L) return;
  map = L.map(containerId, {
    center: [55.597, 13.002],
    zoom: 12,
    zoomControl: false,
    attributionControl: false,
  });

  L.tileLayer('https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png', {
    maxZoom: 18,
  }).addTo(map);

  for (const loc of LOCATIONS) {
    const m = L.circleMarker([loc.lat, loc.lng], {
      radius: 6,
      color: '#1a1a2e',
      fillColor: '#1a1a2e',
      fillOpacity: 0.3,
      weight: 1,
    }).addTo(map).bindTooltip(loc.label, { className: 'map-tooltip', permanent: false });
    m.on('click', () => onClick(loc.id));
    markers.set(loc.id, m);
  }
}

export function updateMap(dread: number, areas: { rosengard: boolean; varnhem: boolean; torso: boolean }): void {
  if (!map) return;

  const levels: Record<string, number> = {
    rosengard:   areas.rosengard ? Math.min(3, Math.floor(dread / 40) + 1) : Math.min(1, Math.floor(dread / 60)),
    varnhem:     areas.varnhem  ? Math.min(3, Math.floor(dread / 35) + 1) : 0,
    torso:       areas.torso    ? 3 : Math.min(1, Math.floor(dread / 80)),
    oresund:     Math.min(2, Math.floor(dread / 50)),
    ribersborg:  Math.min(2, Math.floor(dread / 45)),
    davidshall:  Math.min(1, Math.floor(dread / 70)),
    stortorget:  Math.min(2, Math.floor(dread / 55)),
  };

  for (const [id, marker] of markers) {
    const level = levels[id] ?? 0;
    marker.setStyle({
      radius: dreadRadius(level),
      color: dreadColor(level),
      fillColor: dreadColor(level),
      fillOpacity: 0.15 + level * 0.2,
      weight: level > 0 ? 2 : 1,
    });
  }
}