import curry from '../fp/curry'

/**
 * @desc first fn & second fn
 * @memberOf conditional
 * @since  4.0.1
 *
 * @param  {Function} left first fn
 * @param  {Function} right second fn
 * @return {Function | boolean} both functions return truthy @curried
 *
 * @curried
 * @name and
 * @alias both
 * @func
 *
 * @example
 *
 *    const both = and(x => typeof x === 'boolean', x => x === true)
 *
 *    both([true])
 *    //=> true
 *
 *    both([false])
 *    //=> false
 *
 *    both([1])
 *    //=> false
 *
 */
export interface Return<Value> {
  (...args: any[]): Value
  (): Value
}

export interface And<Value = any> {
  // (left: Return<false>, right: Return<true>): (x: Value) => boolean
  // (left: Return<true>, right: Return<true>): (x: Value) => boolean
  (left: Return<true | false>, right: Return<true | false>): (x: Value) => boolean
}
const and = <Value = any>(left: Return<boolean>, right: Return<boolean>) => (x: Value) => left(x) && right(x)

export default curry(2, and)