//
//  PKPaymentToken+Serializable.swift
//  PSCB-OOS-iOS
//
//  Created by OA on 17.10.2020.
//

import Foundation
import PassKit

// MARK: - Comfront to serializable
extension PKPaymentToken: Serializable {
    
    // Serializes token to a JSONLike dictionary
    public func serializeToJSON() -> JSONDict {
        let paymentJson: JSONDict? = try? JSONSerialization.jsonObject(
            with: self.paymentData, options: .mutableContainers
        ) as? JSONDict

        var paymentType: String = "debit"
        var methodAndNetwork: JSONDict = [
            "network": "",
            "type": paymentType,
            "displayName": ""
        ]

        if #available(iOS 9.0, *) {
            methodAndNetwork = [
                "network": self.paymentMethod.network?.rawValue ?? "",
                "type": paymentType,
                "displayName": self.paymentMethod.displayName ?? ""
            ]

            switch self.paymentMethod.type {
                case .debit:
                    paymentType = "debit"
                case .credit:
                    paymentType = "credit"
                case .store:
                    paymentType = "store"
                case .prepaid:
                    paymentType = "prepaid"
                default:
                    paymentType = "unknown"
                }
        }

        return [
            "paymentData": paymentJson,
            "transactionIdentifier": self.transactionIdentifier,
            "paymentMethod": methodAndNetwork
        ] as JSONDict
    }
    
}

// MARK: - To string cryptogram
extension PKPaymentToken {
    
    private func paymentJSONData() -> JSONDict? {
        let json = self.serializeToJSON()
        let data = json["paymentData"] as! JSONDict?
        
        return data
    }
    
    /// Creates a Base64 encoded cryptogram string accepted by PSCB OOS protocol
    /// May throw JSON serialization errors if token could not be converted to JSON string before writing a cryptogram.
    ///
    /// - Returns: Base64 encoded string
    public func toCryptogramString() throws -> String {
        let json = self.paymentJSONData()
        let data = try JSONSerialization.data(withJSONObject: json!, options: [])
        // let string = String(data: data, encoding: .utf8)!
        
        return data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))
    }
    
}