import {
  createCommentVNode,
  getCurrentInstance,
  inject,
  warn,
  watch,
} from "vue";
import {
  componentIdSymbol,
  isLoadedSymbol,
  mapSymbol,
  sourceIdSymbol,
} from "@/lib/types";
import { useDisposableLayer } from "@/lib/composable/useDisposableLayer";
import {
  genLayerOpts,
  registerLayerEvents,
  type LayersWithSource,
  type LayerProps,
} from "@/lib/lib/layer.lib";
import { SourceLib } from "@/lib/lib/source.lib";

export function useLayer<T extends LayersWithSource>(
  name: string,
  props: LayerProps,
) {
  const sourceId = inject(sourceIdSymbol);

  if (!sourceId && !props.source) {
    warn(
      `${name} Layer: layer must be used inside source tag or source prop must be set`,
    );
    return;
  }

  const ci = getCurrentInstance()!,
    map = inject(mapSymbol)!,
    isLoaded = inject(isLoadedSymbol)!,
    cid = inject(componentIdSymbol)!,
    sourceRef = SourceLib.getSourceRef(cid, props.source || sourceId);
  useDisposableLayer(props.layerId!, ci);

  watch(
    () => props.minzoom,
    () =>
      map.value!.setLayerZoomRange(
        props.layerId!,
        props.minzoom || 0,
        props.maxzoom || 24,
      ),
  );
  watch(
    () => props.maxzoom,
    () =>
      map.value!.setLayerZoomRange(
        props.layerId!,
        props.minzoom || 0,
        props.maxzoom || 24,
      ),
  );
  watch(
    () => props.layout,
    (layout) => {
      if (layout) {
        for (const [property, value] of Object.entries(layout)) {
          map.value!.setLayoutProperty(props.layerId!, property, value);
        }
      }
    },
    { deep: true },
  );
  watch(
    () => props.paint,
    (paint) => {
      if (paint) {
        for (const [property, value] of Object.entries(paint)) {
          map.value!.setPaintProperty(props.layerId!, property, value);
        }
      }
    },
    { deep: true },
  );
  watch(
    () => props.filter,
    (f) => map.value!.setFilter(props.layerId!, f),
    { deep: true },
  );

  watch(
    [isLoaded, sourceRef],
    ([il, src]) => {
      if (il && (src || src === undefined)) {
        map.value!.addLayer(
          genLayerOpts<T>(props.layerId!, name, props, sourceId),
          props.before || undefined,
        );
        registerLayerEvents(map.value!, props.layerId!, ci.vnode);
      }
    },
    { immediate: true },
  );

  return () => createCommentVNode(`${name} Layer`);
}