//
//  KissConsole+WebSocket.swift
//  KissMeConsole
//
//  Created by ened-book-m1 on 2023/09/04.
//

import Foundation
import KissMe


extension KissConsole {
}


public protocol KissAuctionPriceDelegate: AnyObject {
    func auction(_ auction: KissAuction, contactPrice: Domestic.ContractPrice)
    func auction(_ auction: KissAuction, askingPrice: Domestic.AskingPrice)
}


public protocol KissAutionNoticeDelegate: AnyObject {
    func auction(_ auction: KissAuction, contactNotice: Domestic.ContractNotice)
}


public class KissAuction: NSObject {
    
    public class Slot {
        var contractPrice: Domestic.ContractPriceWebSocket!
        var askingPrice: Domestic.AskingPriceWebSocket!
        weak var delegate: KissAuctionPriceDelegate?
        
        var contractPriceReceiver: ContractPriceReceiver!
        var askingPriceReceiver: AskingPriceReceiver!
        
        init(delegate: KissAuctionPriceDelegate?) {
            self.delegate = delegate
        }
        
        func setup(contractPrice: Domestic.ContractPriceWebSocket, askingPrice: Domestic.AskingPriceWebSocket) {
            self.contractPrice = contractPrice
            self.askingPrice = askingPrice
        }
        
        func cleanup() {
            contractPriceReceiver.slot = nil
            contractPriceReceiver.owner = nil
            askingPriceReceiver.slot = nil
            askingPriceReceiver.owner = nil
        }
    }
    
    class ContractPriceReceiver {
        var slot: Slot?
        weak var owner: KissAuction?
        
        init(slot: Slot?, owner: KissAuction) {
            self.slot = slot
            self.owner = owner
        }
    }
    
    class AskingPriceReceiver {
        var slot: Slot?
        weak var owner: KissAuction?
        
        init(slot: Slot?, owner: KissAuction) {
            self.slot = slot
            self.owner = owner
        }
    }
    
    class ContractNoticeReceiver {
        weak var delegate: KissAutionNoticeDelegate?
        weak var owner: KissAuction?

        init(delegate: KissAutionNoticeDelegate?, owner: KissAuction) {
            self.delegate = delegate
            self.owner = owner
        }
    }
    
    
    // TODO: ensure thread-safe
    var slots: [Slot]
    
    let loggable: Bool
    let account: KissAccount
    var contractNotice: Domestic.ContractNoticeWebSocket?
    var contractNoticeReceiver: ContractNoticeReceiver?
    
    public init(account: KissAccount, loggable: Bool) {
        self.slots = [Slot]()
        self.loggable = loggable
        self.account = account
        self.contractNotice = nil
        self.contractNoticeReceiver = nil
    }
    
    
    public func startNotice(delegate: KissAutionNoticeDelegate?) async throws -> Bool {
        //account.approvalKeys.
        guard let isMock = account.isMock else {
            throw GeneralError.invalidAccessToken
        }
        let approvalKey = try await account.getApprovalKey()
        print("notice price key: \(approvalKey)")
        let credential = KissWebSocketCredential(isMock: isMock, accountNo: account.accountNo, approvalKey: approvalKey)
        
        contractNotice = Domestic.ContractNoticeWebSocket(credential: credential, htsID: account.accountNo)
        contractNoticeReceiver = ContractNoticeReceiver(delegate: delegate, owner: self)
        
        try await contractNotice!.connect()
        let result = try await contractNotice!.subscribe()
        return result
    }
    
    
    public func stopNotice() async throws -> Bool {
        guard var contractNotice = contractNotice else {
            return false
        }
        
        let result = try await contractNotice.unsubscribe()
        contractNotice.disconnect()
        contractNoticeReceiver?.delegate = nil
        return result
    }
    
    
    public func addSlot(productNo: String, delegate: KissAuctionPriceDelegate?) async throws -> Slot {
        guard let isMock = account.isMock else {
            throw GeneralError.invalidAccessToken
        }
        
        func createContractPrice() async throws -> Domestic.ContractPriceWebSocket {
            let approvalKey = try await account.getApprovalKey()
            print("contract price key: \(approvalKey)")
            let credential = KissWebSocketCredential(isMock: isMock, accountNo: account.accountNo, approvalKey: approvalKey)
            
            let contractPrice = Domestic.ContractPriceWebSocket(credential: credential, productCode: productNo)
            return contractPrice
        }

        func createAskingPrice() async throws -> Domestic.AskingPriceWebSocket {
            let approvalKey = try await account.getApprovalKey()
            print("asking price key: \(approvalKey)")
            let credential = KissWebSocketCredential(isMock: isMock, accountNo: account.accountNo, approvalKey: approvalKey)
            
            let askingPrice = Domestic.AskingPriceWebSocket(credential: credential, productCode: productNo)
            return askingPrice
        }
        
        let slot = Slot(delegate: delegate)
        slot.askingPriceReceiver = AskingPriceReceiver(slot: slot, owner: self)
        slot.contractPriceReceiver = ContractPriceReceiver(slot: slot, owner: self)
        
        var contractPrice = try await createContractPrice()
        try await contractPrice.connect()
        let result = try await contractPrice.subscribe()
        guard result else {
            throw GeneralError.cannotSubscribeWebSocket
        }
        
        var askingPrice = try await createAskingPrice()
        try await askingPrice.connect()
        let result2 = try await askingPrice.subscribe()
        guard result2 else {
            throw GeneralError.cannotSubscribeWebSocket
        }
        
        slot.setup(contractPrice: contractPrice, askingPrice: askingPrice)
        slots.append(slot)
        return slot
    }
    
    
    public func getSlot(productNo: String) -> Slot? {
        guard let slot = slots.first(where: { $0.contractPrice.productCode == productNo }) else {
            return nil
        }
        return slot
    }
    
    
    public func removeSlot(productNo: String) async throws -> Bool {
        guard let slotIndex = slots.firstIndex(where: { $0.contractPrice.productCode == productNo }) else {
            return false
        }
        let slot = slots.remove(at: slotIndex)
        slot.cleanup()
        return true
    }
    
    private func getWebSocketKey() async throws -> KissWebSocketCredential {
        guard let isMock = account.isMock else {
            throw GeneralError.invalidAccessToken
        }
        
        if try await account.login() {
            let approvalKey = try await account.getApprovalKey()
            return KissWebSocketCredential(isMock: isMock, accountNo: account.accountNo, approvalKey: approvalKey)
        }
        throw GeneralError.cannotIssueApprovalKey
    }
}


extension KissAuction.ContractPriceReceiver: WebSocketDelegate {
    
    func webSocket(_ webSocket: WebSocket, didPingpong dateTime: String) {
    }
    
    func webSocket(_ webSocket: WebSocket, didReceive data: Any) {
        guard let owner = owner else { return }
        guard let data = data as? Domestic.WebSocketData else { return }
        
        switch data {
        case .contractPrice(let price):
            slot?.delegate?.auction(owner, contactPrice: price)
        default:
            break
        }
    }
}


extension KissAuction.AskingPriceReceiver: WebSocketDelegate {
    
    func webSocket(_ webSocket: WebSocket, didPingpong dateTime: String) {
    }
    
    func webSocket(_ webSocket: WebSocket, didReceive data: Any) {
        guard let owner = owner else { return }
        guard let data = data as? Domestic.WebSocketData else { return }
        
        switch data {
        case .askingPrice(let price):
            slot?.delegate?.auction(owner, askingPrice: price)
        default:
            break
        }
    }
}


extension KissAuction.ContractNoticeReceiver: WebSocketDelegate {
    
    func webSocket(_ webSocket: WebSocket, didPingpong dateTime: String) {
    }
    
    func webSocket(_ webSocket: WebSocket, didReceive data: Any) {
        guard let owner = owner else { return }
        guard let data = data as? Domestic.WebSocketData else { return }
        
        switch data {
        case .contractNotice(let notice):
            delegate?.auction(owner, contactNotice: notice)
        default:
            break
        }
    }
}