const fs=require('fs'), acorn=require('./.tmp/analysis/node_modules/acorn'), scope=require('./.tmp/analysis/node_modules/eslint-scope');
const {execFileSync}=require('node:child_process');
const commit=process.argv[2];
const read=file=>commit?execFileSync('git',['show',commit+':'+file],{encoding:'utf8',maxBuffer:2000000}):fs.readFileSync(file,'utf8');
const src=read('frontend/app.js');
function parse(s){return acorn.parse(s,{ecmaVersion:2024,sourceType:'script',locations:true,ranges:true});}
const ast=parse(src), mgr=scope.analyze(ast,{ecmaVersion:2024,sourceType:'script',optimistic:true,ignoreEval:true});
const vars=mgr.globalScope.variables, names=new Set(vars.map(v=>v.name));
const rows=vars.map(v=>{const decl=v.defs[0].parent||v.defs[0].node;const stmt=ast.body.find(n=>n.start<=decl.start&&n.end>=decl.end);return {name:v.name,start:stmt.start,end:stmt.end,line:stmt.loc.start.line,bytes:Buffer.byteLength(src.slice(stmt.start,stmt.end)),outside:v.references.filter(r=>r.identifier.start<stmt.start||r.identifier.start>=stmt.end).map(r=>r.identifier.loc.start.line),imports:[]};});
for(const row of rows){const deps=new Set();for(const v of vars)if(v.name!==row.name&&v.references.some(r=>r.identifier.start>=row.start&&r.identifier.start<row.end))deps.add(v.name);row.imports=[...deps];}
for(const file of (commit?execFileSync('git',['ls-tree','--name-only',commit+':frontend'],{encoding:'utf8'}).trim().split('\n'):fs.readdirSync('frontend')).filter(f=>f.endsWith('.js')&&!f.endsWith('.test.js')&&f!=='app.js')){try{const other=scope.analyze(parse(read('frontend/'+file)),{ecmaVersion:2024,sourceType:'script',optimistic:true,ignoreEval:true});for(const r of other.globalScope.through){if(names.has(r.identifier.name))rows.find(x=>x.name===r.identifier.name).outside.push(file+':'+r.identifier.loc.start.line);}}catch(e){if(!file.includes('entry'))console.error(file,e.message);}}
fs.writeFileSync('perf/.tmp/analysis/declarations.json',JSON.stringify(rows,null,2));
const candidates={shell:['Recommendations','renderSidebar','renderHomePlaylists','updateHomeGridScrollState','updateBottomChrome','setHomeOverPlayer','showMiniBar','updateMiniBar','hideMiniBar','setTile','updateNowPlayingActions','renderSmartSidebar'],presenter:['Presenter'],remote:['Remote'],party:['Party'],share:['Share','External'],stats:['renderStats'],notes:['Notes'],settings:['renderSettings'],service:['ServiceVisual','enterServiceMode','exitServiceMode'],editor:['openVideoEditor'],export:['exportToDevice'],sectionRail:['SectionRail'],gestures:['Gestures']};
const summary=Object.entries(candidates).map(([name,list])=>{const chosen=rows.filter(r=>list.includes(r.name));const coupling=new Set(chosen.flatMap(r=>r.imports).filter(n=>!list.includes(n)));return {name,bytes:chosen.reduce((s,r)=>s+r.bytes,0),coupling:coupling.size,ratio:Math.round(chosen.reduce((s,r)=>s+r.bytes,0)/Math.max(1,coupling.size)),imports:[...coupling],outside:chosen.flatMap(r=>r.outside),list};}).sort((a,b)=>b.ratio-a.ratio);fs.writeFileSync('perf/.tmp/analysis/candidates.json',JSON.stringify(summary,null,2));console.log(summary.map(r=>[r.name,r.bytes,r.coupling,r.ratio].join(' ')).join('\n'));