/* Use a plain object with keys re and im for a complex */
export function isComplex(z) {
   return z && typeof z === 'object' && 're' in z && 'im' in z
}

export function anyComplex(args) {
   for (let i = 0; i < args.length; ++i) {
      if (isComplex(args[i])) return true
   }
   return false
}

export default function create(pmath) {
   const number = pmath('number')
   return pmath('complex', [
      [args => args.length == 2, (x,y) => ({re: number(x), im: number(y)})],
      [args => args.length == 1 && isComplex(args[0]), z => z],
      [args => args.length == 1, x => ({re: number(x), im: 0})]
   ])
}