export const frameworks = [
  ['react','React'],['vue','Vue'],['svelte','Svelte'],['solid','Solid'],
  ['preact','Preact'],['qwik','Qwik'],['lit','Lit'],['vanilla','Vanilla'],
  ['angular','Angular'],['alpine','Alpine.js'],['stencil','Stencil'],['htmx','HTMX'],['stimulus','Stimulus'],
].map(([value,label])=>({value,label}));
export const shells=[{value:'astro',label:'Astro'},{value:'next',label:'Next.js'},...frameworks];

// A conservative preview contract. No user text is evaluated or executed.
export function buildCommand({operation,name,framework,shell,noInstall}) {
  if(!/^[a-z][a-z0-9]*(?:-[a-z0-9]+)*$/.test(name)||name.length>48) return {command:'',error:'Usa entre 1 y 48 caracteres: letras minúsculas, números y guiones simples.'};
  if(/^(con|prn|aux|nul|com[1-9]|lpt[1-9])$/.test(name)) return {command:'',error:'Elige un nombre que no esté reservado por Windows.'};
  if(!frameworks.some(f=>f.value===framework)) return {command:'',error:'Selecciona un framework compatible.'};
  if(operation==='add') return {command:`wu add ${framework} ${name}${noInstall?' --no-install':''}`,error:''};
  if(operation!=='create'||!shells.some(f=>f.value===shell)) return {command:'',error:'Selecciona una operación y un shell compatibles.'};
  return {command:`wu create ${name} --template ${framework} --shell ${shell}`,error:''};
}