import { TerrainState } from "./terrain-state.js";
import { loadLightProperties } from "./light-properties.js";

const state = loadLightProperties().then(properties => new TerrainState(properties));
let timer = null;
const send = message => {
  const buffers = message.type === "light"
    ? [message.field.data.buffer, message.field.blockLevels.buffer, message.field.skyLevels.buffer]
    : message.vertices ? [message.vertices.buffer, message.transparent.buffer] : [];
  self.postMessage(message, buffers);
};
self.onmessage = ({ data }) => {
  state.then(terrain => {
    if (data.type === "sync") {
      if (!terrain.sync(data)) return;
      clearTimeout(timer);
      timer = setTimeout(() => {
        timer = null;
        try { send(terrain.light({dirty:!data.independentMeshes})); }
        catch (error) { send({ type: "error", epoch: terrain.epoch, version: terrain.version, error: error.message }); }
      }, data.independentMeshes ? 225 : 0);
    } else if (data.type === "mesh") {
      try { send(terrain.mesh(data)); }
      catch (error) { send({ ...data, error: error.message }); }
    }
  }).catch(error => send({ type: "error", epoch: data.epoch, version: data.version, error: error.message }));
};