import { VideoOverlay, LatLngBounds, LatLngBoundsExpression, LatLngExpression } from 'leaflet';
import {
  registerWithParent,
  buildOptions,
  parseAttributeValue,
  definePropAccessors,
} from '../core/utils.js';

import {
  createChildRegisterHandler,
  type ChildEntry,
  LeafletRegisterEvent,
} from '../core/register.js';
import type { PropDef, PropTypesFromTable } from '../types/props.js';

const PROPS = {
  url: { kind: 'str', attr: 'url', default: '' },
  bounds: { kind: 'str', attr: 'bounds', default: '' },
  opacity: { kind: 'num', attr: 'opacity', default: 1.0 },
  alt: { kind: 'str', attr: 'alt', default: '' },
  interactive: { kind: 'bool-on', attr: 'interactive' },
  crossOrigin: { kind: 'str', attr: 'cross-origin', default: '' },
  loop: { kind: 'bool-on', attr: 'loop' },
  autoplay: { kind: 'bool-on', attr: 'autoplay' },
  muted: { kind: 'bool-on', attr: 'muted' },
  playsInline: { kind: 'bool-on', attr: 'playsinline' },
} satisfies Record<string, PropDef>;

const PROP_BY_ATTR = new Map<string, string>(
  Object.entries(PROPS).map(([name, spec]) => [spec.attr, name]),
);

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

export class LeafletVideoOverlay extends TypedBase {
  #obj?: VideoOverlay;
  #children = new Map<HTMLElement, ChildEntry>();
  #childHandler?: (e: LeafletRegisterEvent) => void;

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

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

  connectedCallback() {
    const url = this.getAttribute('url') || '';
    this.#obj = new VideoOverlay(
      url,
      this.#parsedBounds(),
      buildOptions(this, PROPS, ['url', 'bounds']),
    );
    this.#childHandler = createChildRegisterHandler(this.#obj, this.#children);
    this.addEventListener('leaflet-register', this.#childHandler as EventListener);
    registerWithParent(this, this.#obj);
  }

  disconnectedCallback() {
    if (this.#childHandler)
      this.removeEventListener('leaflet-register', this.#childHandler as EventListener);
    this.#children.clear();
    this.#obj?.remove();
    this.#obj = undefined;
  }

  attributeChangedCallback(name: string, _old: string | null, val: string | null) {
    if (!this.#obj) return;
    if (name === 'url') {
      if (val) this.#obj.setUrl(val);
    } else if (name === 'bounds') {
      this.#obj.setBounds(new LatLngBounds(this.#parsedBounds() as LatLngExpression[]));
    } else {
      const propName = PROP_BY_ATTR.get(name);
      if (!propName) return;
      const setter =
        `set${propName.charAt(0).toUpperCase()}${propName.slice(1)}` as keyof VideoOverlay;
      if (typeof this.#obj[setter] === 'function') {
        (this.#obj[setter] as (v: unknown) => void)(parseAttributeValue(val));
      }
    }
  }

  #parsedBounds(): LatLngBoundsExpression {
    const raw = this.getAttribute('bounds');
    return raw ? (JSON.parse(raw) as LatLngBoundsExpression) : [];
  }

  getElement(): HTMLVideoElement | undefined {
    return this.#obj?.getElement();
  }
}

customElements.define('leaflet-video-overlay', LeafletVideoOverlay);