//
//  UserDefaultsCodableExtension.swift
//  GradientTest
//
//  Created by Ahmed Khattak on 16/07/2018.
//  Copyright © 2018 Ahmed Khattak. All rights reserved.
//

import Foundation

extension UserDefaults {

    func setCodable<Value: Codable>(codable: Value,  forKey: String)  {



        if isSwiftCodableType(Value.self) || isFoundationCodableType(Value.self) {
            self.set(codable, forKey: forKey)
            return
        }

        do {
            let encoder = JSONEncoder()
            let encoded = try encoder.encode(codable)
            self.set(encoded, forKey: forKey)
            self.synchronize()
        } catch {
            print(error)
        }

    }


    func getCodable<Value: Codable>(ofType: Value.Type ,forKey: String) -> Value?  {

        if isSwiftCodableType(Value.self) || isFoundationCodableType(Value.self) {
            return self.value(forKey: forKey) as? Value
        }

        guard let data = data(forKey: forKey) else {
            return nil
        }

        do {
            let decoder = JSONDecoder()
            let decoded = try decoder.decode(Value.self, from: data)
            return decoded
        } catch {
            print(error)
        }

        return nil

    }


    func clearCodable(forKey: String) {
        self.set(nil, forKey: forKey)
        self.synchronize()
    }


    public func hasCodable(forKey: String) -> Bool {
        return self.value(forKey: forKey) != nil
    }


    /// Checks if the specified type is a Codable from the Swift standard library.
    ///
    /// - Parameter type: The type.
    /// - Returns: A boolean value.
    private func isSwiftCodableType<Value>(_ type: Value.Type) -> Bool {
        switch type {
        case is String.Type, is Bool.Type, is Int.Type, is Float.Type, is Double.Type:
            return true
        default:
            return false
        }
    }

    /// Checks if the specified type is a Codable, from the Swift's core libraries
    /// Foundation framework.
    ///
    /// - Parameter type: The type.
    /// - Returns: A boolean value.
    private func isFoundationCodableType<Value>(_ type: Value.Type) -> Bool {
        switch type {
        case is Date.Type:
            return true
        default:
            return false
        }
    }
}