//
//  Response.swift
//  PSCB-OOS-iOS
//
//  Created by Antonov Ilia on 23.10.2020.
//

import Foundation

// MARK: - PSCB OOS Response status
public enum ResponseStatus: String, Decodable {
    case success = "STATUS_SUCCESS"
    case failure = "STATUS_FAILURE"
}

// MARK: - Acquiring data
public struct AcquiringResponseData: Decodable {
    public let paReq: String?
    public let order: String?
    public let termUrl: String?
    public let url: String?
    public let md: String?
    
    private enum CodingKeys: String, CodingKey {
        case order, termUrl = "TermUrl", url = "URL", md = "MD", paReq = "PaReq"
    }
}

// MARK: - OOS Error

/// An error structure for OOS errors returned in flat JSON
/// `errorCode` and `errorDescription`
public struct ResponseError: Decodable {
    
    public let code: String
    public let description: String?
    
    private enum CodingKeys: String, CodingKey {
        case code = "errorCode"
        case description = "errorDescription"
    }
    
}

// MARK: - OOS Response

/// JSON Response from OOS API
public struct Response: Decodable {
    
    public let status: ResponseStatus
    public let requestId: String
    public let error: ResponseError?
    public let payment: ResponsePayment?
    public let acquiringData: AcquiringResponseData?
    public let description: String?
    
    private enum CodingKeys: String, CodingKey {
        case status, requestId, payment, acquiringData, description
    }
    
    public init(from decoder: Decoder) throws {
        let container  = try decoder.container(keyedBy: CodingKeys.self)
        self.status    = try container.decode(ResponseStatus.self, forKey: .status)
        self.requestId = try container.decode(String.self, forKey: .requestId)
        self.description = try? container.decode(String.self, forKey: .description)
        
        // Decode flat and nested data into nested structs
        self.payment       = try? container.decode(ResponsePayment.self, forKey: .payment)
        self.acquiringData = try? AcquiringResponseData(from: decoder)
        self.error         = try? ResponseError(from: decoder)
    }
    
}

// MARK: - Payment status
/// Payment stats
/// see: https://docs.pscb.ru/oos/index.html#obshaya-informaciya-spravochniki-statusy-platezhej
public enum PaymentState: String, Decodable {
    case sent = "sent"
    case new = "new"
    case end = "end"
    case refunded = "ref"
    case hold = "hold"
    case expired = "exp"
    case canceled = "canceled"
    case error = "error"
    case rejected = "rej"
    case undefined = "undef"
}

// MARK: - Payment response struct
public struct ResponsePayment: Decodable {
    public let orderId: String
    public let showOrderId: String
    public let paymentId: String
    public let amount: Decimal
    public let state: PaymentState
    public let marketPlace: UInt16
    public let stateDate: Date
}