unknownTypeDecoding.swift

//
//  ListItem.swift
//  FetchRewardsAssignment
//
//  Created by Strohanov, Yevhen (Chicago) on 1/14/20.
//  Copyright © 2020 Organization. All rights reserved.
//

import Foundation

class ListItem: Decodable {
    var id: Int?
    var listId: Int?
    var name: String? {
        if let string = _name?.string {
            return string
        } else if let integer = _name?.int {
            return String(describing: integer)
        }
        return nil
    }

    var _name: JSONValue?

    enum CodingKeys: String, CodingKey {
        case id = "id"
        case listId = "listId"
        case _name = "name"
    }
//    required init(from decoder: Decoder) {
//    }
}

enum JSONValue: Decodable {
    case int(Int)
    case string(String)

    init(from decoder: Decoder) throws {
        let singleValueContainer = try decoder.singleValueContainer()

        if let value = try? singleValueContainer.decode(Int.self) {
            self = .int(value)
            return
        } else if let value = try? singleValueContainer.decode(String.self) {
            self = .string(value)
            return
        }
        throw DecodingError.dataCorrupted(DecodingError.Context(codingPath: decoder.codingPath, debugDescription: "Could not find reasonable type to map to JSONValue"))
    }
}

extension JSONValue {
    public var string: String? {
        switch self {
        case .string(let value):
            return value
        default:
            return nil
        }
    }

    public var int: Int? {
        switch self {
        case .int(let value):
            return value
        default:
            return nil
        }
    }
}