//
//  Deserializable.swift
//  MapperDemo
//
//  Created by 默司 on 2016/12/1.
//  Copyright © 2016年 默司. All rights reserved.
//

import Foundation
import SwiftyJSON
import SWXMLHash

protocol NodeAccessable {
    func child(index: Int) -> NodeAccessable
    func child(key: String) -> NodeAccessable

    var string: String? { get }
    var bool: Bool? { get }
    var number: NSNumber? { get }
}

extension JSON : NodeAccessable {
    func child(index: Int) -> NodeAccessable {
        return self[index]
    }

    func child(key: String) -> NodeAccessable {

        return self[key]
    }
}

extension XMLIndexer : NodeAccessable {
    func child(index: Int) -> NodeAccessable {
        return self[index]
    }

    func child(key: String) -> NodeAccessable {
        return self[key]
    }

    var string: String? {
        if let text = self.element?.text {
            return text
        }
        return nil
    }

    var bool: Bool? {
        if let text = self.element?.text {
            return NSString(string: text).boolValue
        }
        return nil
    }

    var number: NSNumber? {
        if let text = self.element?.text {
            if let n = Int(text) {
                return NSNumber(value: n)
            }

            if let n = Float(text) {
                return NSNumber(value: n)
            }

            if let n = Double(text) {
                return NSNumber(value: n)
            }
        }

        return nil
    }
}

protocol Deserializable {
    static func deserialize(input: NodeAccessable) -> Self
}

struct User: Deserializable {
    var username: String?
    var password: String?

    static func deserialize(input: NodeAccessable) -> User {
        var user = User()
        user.username = input.child(key: "username").string
        user.password = input.child(key: "password").string
        return user
    }
}