import { Popup } from 'leaflet';
import { registerWithParent, buildOptions, definePropAccessors } from '../core/utils.js';

import type { PropDef, PropTypesFromTable } from '../types/props.js';

const PROPS = {
  lat: { kind: 'num', attr: 'lat', default: 0 },
  lng: { kind: 'num', attr: 'lng', default: 0 },
  maxWidth: { kind: 'num', attr: 'max-width', default: 300 },
  minWidth: { kind: 'num', attr: 'min-width', default: 50 },
  maxHeight: { kind: 'num', attr: 'max-height', default: 0 },
  autoPan: { kind: 'bool-on', attr: 'auto-pan' },
  closeButton: { kind: 'bool-on', attr: 'close-button' },
  autoClose: { kind: 'bool-on', attr: 'auto-close' },
} satisfies Record<string, PropDef>;

type PropTypes = PropTypesFromTable<typeof PROPS>;
const TypedBase = HTMLElement as unknown as new () => HTMLElement & PropTypes;

export class LeafletPopup extends TypedBase {
  #obj?: Popup;
  #observer?: MutationObserver;

  static get observedAttributes() {
    return Object.values(PROPS).map((s) => s.attr);
  }

  static {
    definePropAccessors(LeafletPopup.prototype, PROPS);
  }

  connectedCallback() {
    this.#obj = new Popup({
      ...buildOptions(this, PROPS, ['lat', 'lng']),
      content: this.innerHTML,
    });
    if (this.hasAttribute('lat') && this.hasAttribute('lng')) {
      this.#obj.setLatLng([this.#num('lat'), this.#num('lng')]);
    }
    registerWithParent(this, this.#obj);

    this.#observer = new MutationObserver(() => {
      this.#obj?.setContent(this.innerHTML);
    });
    this.#observer.observe(this, {
      childList: true,
      characterData: true,
      subtree: true,
    });
  }

  disconnectedCallback() {
    this.#observer?.disconnect();
    this.#observer = undefined;
    this.#obj?.remove();
    this.#obj = undefined;
  }

  attributeChangedCallback(name: string) {
    if (!this.#obj) return;
    if (name === 'lat' || name === 'lng') {
      this.#obj.setLatLng([this.#num('lat'), this.#num('lng')]);
    }
  }

  #num(name: string): number {
    const v = this.getAttribute(name);
    return v !== null
      ? Number(v)
      : (PROPS[name as keyof typeof PROPS] as { default: number }).default;
  }
}

customElements.define('leaflet-popup', LeafletPopup);