import { Predicate } from '../types'
import { isArray } from '../predicates/isArray'

export const tuple = <T extends ReadonlyArray<any>>(...predicates: { [K in keyof T]: Predicate<T[K]> }) => {
  const length = predicates.length
  return (value: unknown): value is { [K in keyof T]: T[K] } => {
    const isTupleOfLength = isArray(value) && value.length === length
    if (isTupleOfLength) {
      for (let i = 0; i < length; ++i) {
        if (!predicates[i]((value as any)[i])) {
          return false
        }
      }
    }
    return isTupleOfLength
  }
}