'use strict';
importScripts('build-meta.js');
importScripts('puzzle-patterns.js');
importScripts(`puzzle-core.js?v=${BendBuildMeta.APP_VERSION}-${BendBuildMeta.GENERATOR_VERSION}`);

const uniquenessCache = new Map();
self.onmessage = ({data}) => {
  const {id, action='generate', chunks, seed, level, originX, originY, generationOptions, generatorVersion} = data;
  try {
    if (generatorVersion !== BendPuzzle.GENERATOR_VERSION) throw new Error('Generator version mismatch');
    if (action === 'verify') {
      const signature = BendPuzzle.puzzleSignature(data.puzzle);
      const cacheKey = JSON.stringify([signature, data.limits || null]);
      let result = uniquenessCache.get(cacheKey);
      if (!result) {
        result = BendPuzzle.verifyPuzzleUniqueness(data.puzzle, data.limits || null);
        uniquenessCache.set(cacheKey, result);
        if (uniquenessCache.size > 256) uniquenessCache.delete(uniquenessCache.keys().next().value);
      }
      self.postMessage({id, result, generatorVersion: BendPuzzle.GENERATOR_VERSION});
      return;
    }
    const puzzle = BendPuzzle.generatePuzzle(chunks, seed, level, originX, originY, generationOptions || null);
    self.postMessage({id, puzzle, generatorVersion: BendPuzzle.GENERATOR_VERSION});
  } catch (error) {
    self.postMessage({id, error: error?.message || String(error), generatorVersion: BendPuzzle.GENERATOR_VERSION});
  }
};