'use strict';
const fs=require('fs');
const path=require('path');

const root=path.resolve(__dirname,'..');
const corePath=path.join(root,'puzzle-core.js');
const patternsPath=path.join(root,'puzzle-patterns.js');
const source=fs.readFileSync(corePath,'utf8');
const loader="const PuzzlePatterns=root.BendPuzzlePatterns||(typeof module==='object'&&module.exports?require('./puzzle-patterns'):null);\nif(!PuzzlePatterns)throw new Error('BendPuzzlePatterns is not loaded');\nconst MICRO_PATTERN_SETS=PuzzlePatterns.MICRO_PATTERN_SETS;\n";

if(source.includes("require('./puzzle-patterns')")){
  if(!fs.existsSync(patternsPath))throw new Error('puzzle-core.js is split but puzzle-patterns.js is missing');
  process.exit(0);
}
const start=source.indexOf('const MICRO_PATTERN_SETS='),end=source.indexOf('\nconst H_PORT_PROFILES=',start);
if(start<0||end<0)throw new Error('Could not locate the generated micro-pattern table');
const declaration=source.slice(start,end),expression=declaration.slice('const MICRO_PATTERN_SETS='.length,-1);
const patternModule=`'use strict';\n// Generated puzzle routing patterns, split from puzzle-core.js. Do not edit by hand.\n(function(root,factory){const api=factory();if(typeof module==='object'&&module.exports)module.exports=api;if(root)root.BendPuzzlePatterns=api})(typeof globalThis!=='undefined'?globalThis:this,()=>Object.freeze({MICRO_PATTERN_SETS:Object.freeze(${expression})}));\n`;
fs.writeFileSync(patternsPath,patternModule);
fs.writeFileSync(corePath,source.slice(0,start)+loader+source.slice(end+1));