//
//  CCCPControllerCreateExchangeRequest.swift
//  PayCash
//
//  Created by Saveliy Stavitsky on 7/30/20.
//  Copyright © 2020 List. All rights reserved.
//

import UIKit

private typealias Contract = Network.Model.Contract
private typealias BlockchainAction = Network.Model.Blockchain.Action

class CCCPControllerCreateExchangeRequest: UIViewController {

    @IBOutlet private var mainStackView: UIStackView!
    @IBOutlet private weak var tokeGiveView: CommonViewCard!
    @IBOutlet private var labelsStackView: UIStackView!
    @IBOutlet private weak var youSendInfoLbl: CommonViewInfoLabel!
    @IBOutlet private weak var youGiveInfoLbl: CommonViewInfoLabel!
    @IBOutlet private weak var youGetInfoLbl: CommonViewInfoLabel!

    @IBOutlet var youGiveTokenSelectorView: CCCPViewTokenSelector!
    @IBOutlet var warning1Label: UILabel!
    @IBOutlet var youGetTokenSelectorView: CCCPViewTokenSelector!
    @IBOutlet var warning2Label: UILabel!

    @IBOutlet var createRequestButton: CommonButtonAction!

    var cashTokens: [Network.Model.Token] { Wallet.Service.Tokens.shared.cashTokens }
    var tokens: [Network.Model.Token] { Wallet.Service.Tokens.shared.balances.collection }

    var selectedTokens: (Network.Model.Token, Network.Model.Token)? {
        guard let tokenGive = youGiveTokenSelectorView.selectedToken,
            let cashTokenGive = cashTokens.first(where: { $0.symbol == tokenGive.symbol }) else {
            return nil
        }
        return (tokenGive, cashTokenGive)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.title = L10n.Cccp.CreateExchangeRequest.title
        navigationItem.leftBarButtonItem = .pop(self)

        youGiveTokenSelectorView.titleLabel.text = L10n.Cccp.DestroyTokens.youGiveTitle
        youGiveTokenSelectorView.secondTitleLabel.isHidden = true
        youGiveTokenSelectorView.notesTitleLabel.text = L10n.Cccp.DestroyTokens.youGiveYouGiveTitle
        youGiveTokenSelectorView.countSectionStackView.isHidden = true
        youGiveTokenSelectorView.balanceStackView.isHidden = false
        youGiveTokenSelectorView.parentViewController = self

        youGetTokenSelectorView.secondTitleLabel.isHidden = true
        youGetTokenSelectorView.countSectionStackView.isHidden = true
        youGetTokenSelectorView.currencyPickerSectionStackView.isHidden = true
        youGetTokenSelectorView.currencySectionImageView.isHidden = true
        youGetTokenSelectorView.notesTitleLabel.text = L10n.Cccp.DestroyTokens.youGetYouGetTitle
        youGetTokenSelectorView.parentViewController = self

        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineSpacing = 4.0
        warning1Label.attributedText = L10n.Cccp.OutgoingExchangeRequest.warning1.attributed
            .applying(attribute: .paragraphStyle, value: paragraphStyle)
        warning2Label.attributedText = L10n.Cccp.OutgoingExchangeRequest.warning2.attributed
            .applying(attribute: .paragraphStyle, value: paragraphStyle)

        observers.append(contentsOf: [
            Notification.subscribe(name: .didChangeAccount) { _ in Loader.show() },
            Notification.subscribe(name: .didUpdateBalances) { [weak self] _ in self?.setupView() }
        ])
        setupView()
    }

    var observers: [AnyObject] = []
    deinit { observers.forEach({ Notification.unsubscribe(observer: $0) }) }

    func setupView() {
        youGiveTokenSelectorView.tokens = tokens
            .filter { cashTokens.contains($0) }

        tokeGiveView.action = .cards(
            tokens: youGiveTokenSelectorView.tokens,
            selected: youGiveTokenSelectorView.selectedToken,
            empty: .menu(
                image: Asset.commonToken.image.tinted(with: Asset.deepWater.color),
                title: L10n.Cccp.CreateExchangeRequest.titleCard
            )
        ) { [weak self] in
            self?.youGiveTokenSelectorView.index = self?.youGiveTokenSelectorView.tokens.index(of: $0.uuid) ?? -1
        }

        Loader.hide()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        Accounts().isLocked = true
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        Accounts().isLocked = false
    }

    @IBAction func createRequestPressed(_ sender: Any) {
        guard let username = Accounts().current?.username,
            let (_, cashTokenGive) = selectedTokens else { return }

        let amount = cashTokenGive.certCoef
            .toCanonicalString(precision: cashTokenGive.precision, symbol: cashTokenGive.symbol)
        let data = ["creator": username, "volume": amount]
        let actions: [(Contract, BlockchainAction, Codable)] = [(.cash, .cashCreatereq, data)]

        Popup.show(title: navigationItem.title, views: [labelsStackView], submit: L10n.Common.Button.confirm, in: self, { [unowned self] ctrl in
            AccountViewAuthorize.showGetPrivateKey(in: self) {
                Loader.show(in: ctrl)
                Network.Service.Blockchain.execute(actions: actions, privateKeys: [$0]) { result in
                    Loader.hide(in: ctrl)
                    ctrl.dismiss(animated: true)
                    switch result {
                    case .success(let trxId):
                        Account.Service.History.shared.current?.fetchUntil(trxId: trxId)
                        delayed(0.5) { //needed because labelsStackView will free inly after previous popup hde
                            Popup.show(title: L10n.Cccp.CreateExchangeRequest.createdTitle,
                                       views: [labelsStackView], in: self)
                        }
                    case let .failure(error):
                        Alert.notify(error, pop: self)
                    }
                }
            }
        }, { [weak self] in
            guard let self = self else { return }
            self.mainStackView.addArrangedSubview(self.labelsStackView)
        })
    }
}

extension CCCPControllerCreateExchangeRequest: CCCPViewTokenSelectorDelegate {

    func stateChanged() {
        //Reset appearance
        youGiveTokenSelectorView.notesSectionSubStackView.arrangedSubviews
            .forEach({ $0.removeFromSuperview() })
        youGetTokenSelectorView.notesSectionSubStackView.arrangedSubviews
            .forEach({ $0.removeFromSuperview() })
        youGiveInfoLbl.clearErrors()
        createRequestButton.isEnabled = false

        guard let (tokenGive, cashTokenGive) = selectedTokens else { return }
        labelsStackView.isHidden = false

        //Cash token select section view appearance
        let labelCashTokens = CCCPLabelAddMoneyColored(sign: "-", amount: cashTokenGive.certCoef, symbol: tokenGive.symbol)
        youGiveTokenSelectorView.notesSectionSubStackView.addArrangedSubview(labelCashTokens)

        let sendCount = "0.9975".toDecimal() * cashTokenGive.certCoef
        let cashCount = "0.97".toDecimal() * cashTokenGive.certCoef
        let cashSymbol = tokenGive.symbol.uppercased().replacingOccurrences(of: "CASH", with: "")
        let labelListTokens = CCCPLabelAddMoneyColored(amount: cashCount, symbol: cashSymbol)
        youGetTokenSelectorView.notesSectionSubStackView.addArrangedSubview(labelListTokens)

        youSendInfoLbl.updateText("\(cashTokenGive.certCoef.toString(max: 5)) \(tokenGive.symbol)")
        youGiveInfoLbl.updateText("\(cashTokenGive.certCoef.toString(max: 5)) \(tokenGive.symbol)")
        youGetInfoLbl.updateText("\(cashCount.toString(max: 5)) \(cashSymbol)")

        if let amountHave = tokens.first(where: { $0.symbol == cashTokenGive.symbol })?.amount {
            if amountHave >= cashTokenGive.certCoef.toString(max: 5, group: false).toDecimal() {
                createRequestButton.isEnabled = true
            } else {
                youGiveInfoLbl.addError(L10n.Cccp.CreateExchangeRequest.youGiveAmountError(cashTokenGive.symbol))
            }
        }
    }
}