/**
 # Tuple-to-array for Swift
 
 By Ethan McTague - January 28, 2020
 This source code is in the public domain.
 
 ## Example
 
 To convert a tuple of Ints into an array of ints:
 
 ```
 let ints = (10, 20, 30)
 let result = [Int].fromTuple(ints)
 print(result!) // prints Optional([10, 20, 30])
 ```
    
 */

import Cocoa

extension Array {
    
    /**
     Attempt to convert a tuple into an Array.
     
     - Parameter tuple: The tuple to try and convert. All members must be of the same type.
     - Returns: An array of the tuple's values, or `nil` if any tuple members do not match the `Element` type of this array.
     */
    static func fromTuple<Tuple> (_ tuple: Tuple) -> [Element]? {
        let val = Array<Element>.fromTupleOptional(tuple)
        return val.allSatisfy({ $0 != nil }) ? val.map { $0! } : nil
    }
    
    /**
     Convert a tuple into an array.
     
     - Parameter tuple: The tuple to try and convert.
     - Returns: An array of the tuple's values, with `nil` for any values that could not be cast to the `Element` type of this array.
     */
    static func fromTupleOptional<Tuple> (_ tuple: Tuple) -> [Element?] {
        return Mirror(reflecting: tuple)
            .children
            .filter { child in
                (child.label ?? "x").allSatisfy { char in ".1234567890".contains(char) }
            }.map { $0.value as? Element }
    }
}