import {configDependency} from '../core/Config.js'
import {Dependency} from '../core/Dispatcher.js'

export const add = (a: number, b: number) => a + b
export const unaryMinus = (a: number) => -a
export const subtract = (a: number, b: number) => a - b
export const multiply = (a: number, b: number) => a * b
export const divide = (a: number, b: number) => a / b
export const sqrt =
   (dep: configDependency
    & Dependency<'complex', [number, number]>) => {
       if (dep.config.predictable || !dep.complex) {
          return (a: number) => isNaN(a) ? NaN : Math.sqrt(a)
       }
       return (a: number) => {
          if (isNaN(a)) return NaN
          if (a >= 0) return Math.sqrt(a)
          return dep.complex(0, Math.sqrt(unaryMinus(a)))
       }
    }