//
//  AnyEquatable.swift
//  VDS
//
//  Created by Matt Bruce on 9/15/22.
//

import Foundation

public protocol AnyEquatable {
    func isEqual(_ equatable: Self) -> Bool
}

extension AnyEquatable {
    public func isEqual(_ anyEquatable: any AnyEquatable) -> Bool {
        guard let equatable = anyEquatable as? Self else {
            return false
        }
        return isEqual(equatable)
    }
}

func == (lhs: (any AnyEquatable)?, rhs: (any AnyEquatable)?) -> Bool {
    switch (lhs, rhs) {
    case (.some(let lhs), .some(let rhs)):
        return lhs.isEqual(rhs)
    case (.none, .none):
        return true
    default:
        return false
    }
}

func != (lhs: (any AnyEquatable)?, rhs: (any AnyEquatable)?) -> Bool {
    return !(lhs == rhs)
}

func == (lhs: [any AnyEquatable]?, rhs: [any AnyEquatable]?) -> Bool {
    switch (lhs, rhs) {
    case (.some(let lhs), .some(let rhs)):
        return lhs == rhs
    case (.none, .none):
        return true
    default:
        return false
    }
}

func != (lhs: [any AnyEquatable]?, rhs: [any AnyEquatable]?) -> Bool {
    return !(lhs == rhs)
}

func == (lhs: [any AnyEquatable], rhs: [any AnyEquatable]) -> Bool {
    return lhs.elementsEqual(rhs, by: { (lhsElement, rhsElement) -> Bool in
        return lhsElement == rhsElement
    })
}

func != (lhs: [any AnyEquatable], rhs: [any AnyEquatable]) -> Bool {
    return !(lhs == rhs)
}