//
//  CoinsRechargeSheet.swift
//  Crush
//
//  Created by Leon on 2025/9/16.
//

import UIKit
import Combine

class CoinsRechargeSheet: EGPopBaseView {
    var titleLabel: UILabel!
    var descLabel: CLLabel!
    var closeButton: EPIconTertiaryButton!

    var bottomView: UIView!
    var balanceLabel: CLIconLabel!
    var rechargeButton: StyleButton!

    var layout = UICollectionViewFlowLayout()
    var cv: UICollectionView!
    
    // MARK: - 数据源和状态管理
    private var cancellables = Set<AnyCancellable>()
    @Published private var datas = [IAPProducts]()
    @Published private var selectIndex = 0
    @Published private var selectProduct: IAPProducts?
    private let viewModel = CoinsRechargeViewModel()

    init() {
        super.init(direction: .bottom)

        contentView.backgroundColor = .c.csbn
        contentLength = 549 + UIWindow.safeAreaBottom

        setupViews()
        setupDatas()
        setupEvents()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupViews() {
        contentView.backgroundColor = .c.csbn
        
        closeButton = {
            let v = EPIconTertiaryButton(radius: .round, iconSize: .small, iconCode: .delete)
            v.addTarget(self, action: #selector(bgButtonPressed), for: .touchUpInside)
            contentView.addSubview(v)
            v.snp.makeConstraints { make in
                make.top.equalToSuperview().offset(20)
                make.size.equalTo(v.bgImageSize())
                make.trailing.equalToSuperview().offset(-16)
            }
            return v
        }()

        titleLabel = {
            let v = UILabel()
            v.font = .t.ttm
            v.textColor = .text
            v.textAlignment = .center
            contentView.addSubview(v)
            v.snp.makeConstraints { make in
                make.leading.equalToSuperview().offset(24)
                make.trailing.equalToSuperview().offset(-24)
                make.top.equalToSuperview().offset(32)
            }
            return v
        }()

        descLabel = {
            let v = CLLabel()
            v.font = .t.tbs
            v.numberOfLines = 2
            contentView.addSubview(v)
            v.snp.makeConstraints { make in
                make.leading.equalToSuperview().offset(CGFloat.lrs)
                make.trailing.equalToSuperview().offset(-CGFloat.lrs)
                // make.top.equalTo(titleLabel.snp.bottom).offset(24)
                // make.top.equalToSuperview().offset(80)
                make.centerY.equalTo(contentView.snp.top).offset(80 + 10)
            }
            return v
        }()

        bottomView = {
            let v = UIView()
            contentView.addSubview(v)
            v.snp.makeConstraints { make in
                make.leading.trailing.equalToSuperview()
                make.bottom.equalToSuperview().offset(-UIWindow.safeAreaBottom)
                make.height.equalTo(80)
            }
            return v
        }()

        balanceLabel = {
            let v = CLIconLabel()
            v.spacing = 8
            v.iconSize = CGSize(width: 24, height: 24)
            v.iconImageView.image = UIImage.icon32Diamond
            v.contentLabel.textColor = .text
            v.contentLabel.font = .t.tndm
            v.contentLabel.text = "0"
            bottomView.addSubview(v)
            v.snp.makeConstraints { make in
                make.leading.equalToSuperview().offset(24)
                make.centerY.equalToSuperview()
            }
            return v
        }()
        
        rechargeButton = {
            let v = StyleButton()
            v.primary(size: .large)
            v.addTarget(self, action: #selector(rechargeButtonAction), for: .touchUpInside)
            bottomView.addSubview(v)
            v.snp.makeConstraints { make in
                make.centerY.equalToSuperview()
                make.trailing.equalToSuperview().offset(-24)
                //make.leading.equalToSuperview().offset(<#T##amount: any ConstraintOffsetTarget##any ConstraintOffsetTarget#>)
                make.leading.greaterThanOrEqualTo(balanceLabel.snp.trailing).offset(16)
            }
            return v
        }()

        do {
            let width = floor((UIScreen.width - 24 * 2 - 16) * 0.5)
            let height = 96.0

            layout.scrollDirection = .vertical
            layout.itemSize = CGSize(width: width, height: height)
            layout.minimumLineSpacing = 16
            layout.minimumInteritemSpacing = 16
            layout.sectionInset = UIEdgeInsets(top: 0, left: 24, bottom: 0, right: 24)

            cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
            cv.backgroundColor = .clear
            cv.showsHorizontalScrollIndicator = false
            cv.delegate = self
            cv.dataSource = self
            cv.contentInsetAdjustmentBehavior = .never
            cv.register(CoinsRechargeGridCell.self, forCellWithReuseIdentifier: "CoinsRechargeGridCell")

            
            contentView.addSubview(cv)
            cv.snp.makeConstraints { make in
                make.leading.trailing.equalToSuperview()
                make.top.equalToSuperview().offset(136)
                //make.bottom.equalToSuperview()
                make.bottom.equalTo(bottomView.snp.top)
            }
        }
        
        titleLabel.text = "Crush Coin insufficient"
        descLabel.text = "The Crush coin is insufficient and cannot continue, please recharge"
        rechargeButton.setTitle("Recharge", for: .normal)
    }
    
    // MARK: - 事件设置
    private func setupEvents() {
        // 监听选择索引变化
        $selectIndex.sink { [weak self] index in
            guard let self = self else { return }
            if index < self.datas.count {
                self.selectProduct = self.datas[index]
            }
        }.store(in: &cancellables)
        
        $datas.sink {[weak self] products in
            self?.selectIndex = self?.selectIndex ?? 0
        }.store(in: &cancellables)
        
        // 监听钱包余额变化
        WalletCore.shared.$balance.sink { [weak self] wallet in
            self?.balanceLabel.contentLabel.text = wallet.displayBalance()
//            DispatchQueue.main.asyncAfter(deadline: .now() + 0.35) {
//                self?.dismiss()
//            }
        }.store(in: &cancellables)
        
        NotificationCenter.default.addObserver(self, selector: #selector(notifyChargeDone), name: AppNotificationName.chargeDonePushTradeId.notificationName, object: nil)
    }
    
    @objc private func notifyChargeDone(){
        dismiss()
    }
    
    // MARK: - 数据加载
    private func setupDatas() {
        loadBalance()
        loadCoinsTiers()
    }
    
    private func loadBalance() {
        WalletCore.shared.refreshWallet()
    }
    
    private func loadCoinsTiers() {
        CLPurchase.shared.loadCoinTiersProducts { [weak self] response in
            self?.handleValidProductsInEpalServer(products: response?.productList)
        }
    }
    
    // MARK: - 处理有效产品
    private func handleValidProductsInEpalServer(products: [IAPProducts]?) {
        guard let items = products else {
            return
        }

        datas = items
        cv.reloadData()
        
        // 显示加载指示器
        Hud.showIndicator()
        IAPCore.shared.requestProducts(items) { [weak self] iapIds in
            Hud.hideIndicator()
            var validProducts: [IAPProducts] = []
            for id in iapIds {
                for per in items {
                    if id == per.productId {
                        validProducts.append(per)
                        continue
                    }
                }
            }
            self?.datas = validProducts
            self?.cv.reloadData()
        }
    }
    
    // MARK: - 充值按钮点击
    @objc private func rechargeButtonAction() {
        guard let selectedProduct = selectProduct else {
            Hud.toast(str: "Please select a recharge option")
            return
        }
        
        // 开始购买流程
        viewModel.purchase(product: selectedProduct) { [weak self] success, tradeNo in
            if success, let tradeId = tradeNo {
                selectedProduct.tradeId = tradeId
                IAPCore.shared.addPayProductId(productId: selectedProduct.productId ?? "", tradeId: tradeId)
            } else {
                Hud.toast(str: "Purchase failed, please try again")
            }
        }
    }
}

extension CoinsRechargeSheet: UICollectionViewDelegate, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return datas.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CoinsRechargeGridCell", for: indexPath) as! CoinsRechargeGridCell
        let data = datas[indexPath.item]
        cell.block.backgroundColor = .c.csnn
        cell.config(data)
        cell.setupSelected(selected: indexPath.item == selectIndex)
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        selectIndex = indexPath.item
        collectionView.reloadData()
    }
}