'use strict';
const fs=require('fs');
const path=require('path');
const vm=require('vm');
const root=path.resolve(__dirname,'../..');
const read=name=>fs.readFileSync(path.join(root,name),'utf8');
const app=read('app.js'),html=read('index.html'),css=`${read('style.css')}\n${read('client/styles/tokens.css')}\n${read('client/styles/base.css')}\n${read('client/ui/cursor.css')}\n${read('client/styles/accessibility.css')}`,worker=read('puzzle-worker.js'),appLogicSource=read('app-logic.js'),buildMetaSource=read('build-meta.js');
const buildMeta=require(path.join(root,'build-meta.js'));
function assert(value,message){if(!value)throw new Error(message)}
function functionSource(name,source=app){
  let start=source.indexOf(`async function ${name}(`);if(start<0)start=source.indexOf(`function* ${name}(`);if(start<0)start=source.indexOf(`function ${name}(`);
  assert(start>=0,`Missing ${name}`);
  let paren=source.indexOf('(',start),parenDepth=0,body=-1;
  for(let i=paren;i<source.length;i++){
    if(source[i]==='(')parenDepth++;
    else if(source[i]===')'&&--parenDepth===0){body=source.indexOf('{',i);break}
  }
  assert(body>=0,`Missing body for ${name}`);let depth=0;
  for(let i=body;i<source.length;i++){
    if(source[i]==='{')depth++;
    else if(source[i]==='}'&&--depth===0)return source.slice(start,i+1);
  }
  throw new Error(`Unclosed ${name}`);
}
function createContext(context={}){vm.createContext(context);return context}
function runFunctions(names,context,expose=names){
  createContext(context);
  const sources=names.map(name=>functionSource(name)).join('\n');
  vm.runInContext(`${sources}\nthis.logic={${expose.join(',')}};`,context);
  return context.logic;
}
function loadBendPuzzle(){
  delete global.BendPuzzle;
  delete require.cache[require.resolve(path.join(root,'puzzle-core.js'))];
  require(path.join(root,'puzzle-core.js'));
  return global.BendPuzzle;
}
function loadAppLogic(){
  delete require.cache[require.resolve(path.join(root,'app-logic.js'))];
  return require(path.join(root,'app-logic.js'));
}
function starterPuzzle(){
  const match=app.match(/const STARTER_PUZZLE=Object\.freeze\((\{.*\})\);\nconst SCORE_VERSION/s);
  assert(match,'Bundled origin puzzle missing');
  return JSON.parse(match[1]);
}
module.exports={root,read,app,html,css,worker,appLogicSource,buildMetaSource,buildMeta,assert,functionSource,createContext,runFunctions,loadBendPuzzle,loadAppLogic,starterPuzzle,vm,path,fs};