const fs = require('node:fs');
const vm = require('node:vm');
const assert = require('node:assert/strict');
const ux = fs.readFileSync('src/pages/index/index.ux', 'utf8');
const script = ux.match(/<script>([\s\S]*?)<\/script>/)[1];
function page() {
  const spec = vm.runInNewContext(script.replace('export default', 'globalThis.spec =') + '\nspec');
  return Object.assign({}, spec.private, spec);
}
const p = page();
assert.equal(typeof p.press, 'function', 'Keypress handler must exist');
['2','+','3','='].forEach(k => p.press(k));
assert.equal(p.display, '5');
console.log('PASS addition through page keypress handler');
const cases = [
 ['subtract',['9','-','4','='],'5'],
 ['multiply',['6','x','7','='],'42'],
 ['divide',['8','/','2','='],'4'],
 ['decimals',['0','.','1','+','0','.','2','='],'0.3'],
 ['duplicate dot',['1','.','.','2'],'1.2'],
 ['sign',['5','+/-','x','2','='],'-10'],
 ['percent',['5','0','%'],'0.5'],
 ['percent add',['2','0','0','+','1','0','%','='],'220'],
 ['percent multiply',['2','0','0','x','1','0','%','='],'20'],
 ['clear',['9','+','AC','2','='],'2'],
 ['zero division',['8','/','0','='],'Error'],
 ['recover',['8','/','0','=','3'],'3'],
 ['chain',['2','+','3','x','4','='],'20'],
 ['replace operator',['2','+','x','3','='],'6'],
 ['repeat equals',['2','+','3','=','=', '='],'11'],
 ['fresh entry',['2','+','3','=','7'],'7'],
 ['input cap',Array(20).fill('9'),'999999999'],
 ['leading zero',['0','0','2'],'2']
];
for(const [name,keys,expected] of cases) {
 const c=page(); keys.forEach(k=>c.press(k)); assert.equal(c.display,expected,name);
}
assert.match(ux, /\{\{ display \}\}/);
const keys=[...ux.matchAll(/<text[^>]*onclick="press\('([^']+)'\)"/g)].map(m=>m[1]);
assert.equal(keys.length,19,'every button must have handler');
assert.equal(new Set(keys).size,19);
console.log('PASS',cases.length,'edge cases and all 19 button bindings');