//
//  FAPayRetainAlert.swift
//  Fableon
//
//  Created by 湖北秦九 on 2026/1/13.
//

import UIKit
import SnapKit
import YYText

class FAPayRetainAlert: FABaseAlert {

    var model: FAPayDateModel? {
        didSet {
            self.collectionView.reloadData()
            self.titleLabel.text = model?.retrieve_lang?.title
            self.countdownView.model = model

            bonusTagView.update(text: model?.retrieve_lang?.subtitle ?? "")
        }
    }

    private var selectedIndex = FAPayRetainAlertData.defaultSelectedIndex

    private lazy var bgView: UIImageView = {
        let imageView = UIImageView(image: UIImage(named: FAPayRetainAlertData.Assets.background))
        imageView.contentMode = .scaleToFill
        imageView.isUserInteractionEnabled = true
        return imageView
    }()

    private lazy var titleLabel: FALabel = {
        let label = FALabel()
        label.borderLineWidth = 6
        label.borderColor = ._9_ED_0_FF
        label.text = FAPayRetainAlertData.titleText
        label.font = .font(ofSize: 44, weight: .init(900)).withBoldItalic()
        label.textStartPoint = .init(x: 0, y: 0.5)
        label.textEndPoint = .init(x: 1, y: 0.5)
        label.textColors = [
            UIColor.fa_hex(0x0178FF).cgColor,
            UIColor.fa_hex(0x0D8AFF).cgColor
        ]
        return label
    }()

    private lazy var countdownView: PayRetainCountdownView = {
        let view = PayRetainCountdownView()
        view.update(prefix: FAPayRetainAlertData.countdownPrefix,
                    countdown: FAPayRetainAlertData.countdown,
                    suffix: FAPayRetainAlertData.countdownSuffix)
        return view
    }()

    private lazy var bonusTagView: PayRetainBonusTagView = {
        let view = PayRetainBonusTagView()
        return view
    }()

    private lazy var collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .vertical
        layout.minimumLineSpacing = FAPayRetainAlertData.Layout.packItemSpacing
        layout.minimumInteritemSpacing = 0
        layout.itemSize = FAPayRetainAlertData.Layout.packItemSize

        let view = UICollectionView(frame: .zero, collectionViewLayout: layout)
        view.backgroundColor = .clear
        view.isScrollEnabled = false
        view.showsVerticalScrollIndicator = false
        view.dataSource = self
        view.delegate = self
        view.register(FAPayRetainPackCell.self, forCellWithReuseIdentifier: FAPayRetainPackCell.reuseIdentifier)
        return view
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)

        fa_setupLayout()
        collectionView.reloadData()
    }

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

}

extension FAPayRetainAlert {

    private func fa_setupLayout() {
        contentWidth = FAPayRetainAlertData.Layout.contentWidth
        contentView.backgroundColor = .clear
        contentView.layer.cornerRadius = 0
        contentView.layer.masksToBounds = true

        contentView.addSubview(bgView)
        contentView.addSubview(titleLabel)
        contentView.addSubview(countdownView)
        contentView.addSubview(bonusTagView)
        contentView.addSubview(collectionView)


        bgView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }

        titleLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(143)
            make.centerX.equalToSuperview()
            make.right.lessThanOrEqualToSuperview().offset(0)
        }

        countdownView.snp.makeConstraints { make in
            make.left.equalToSuperview().offset(FAPayRetainAlertData.Layout.countdownLeft)
            make.top.equalTo(titleLabel.snp.bottom).offset(2)
        }

        bonusTagView.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(35)
            make.centerX.equalToSuperview()
            make.right.lessThanOrEqualToSuperview().offset(-10)
            make.height.equalTo(FAPayRetainAlertData.Layout.bonusTagHeight)
        }

        collectionView.snp.makeConstraints { make in
            make.left.equalToSuperview().offset(10)
            make.right.equalToSuperview().offset(-10)
            make.top.equalTo(bonusTagView.snp.bottom).offset(15)
            make.bottom.equalToSuperview().offset(-10)
        }

    }

}

// MARK: - UICollectionViewDataSource & Delegate
extension FAPayRetainAlert: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.model?.list_coins?.count ?? 0
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: FAPayRetainPackCell.reuseIdentifier, for: indexPath) as! FAPayRetainPackCell
        let item = self.model?.list_coins?[indexPath.row]
        cell.configure(with: item, isSelected: indexPath.item == selectedIndex)
        return cell
    }

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

// MARK: - Subviews
extension FAPayRetainAlert {
    final class PayRetainCountdownView: UIView {
        var model: FAPayDateModel? {
            didSet {
                prefixLabel.text = model?.retrieve_lang?.remaining_time
                suffixLabel.text = model?.retrieve_lang?.miss_out
            }
        }

        private static let defaultCountdownSeconds = 4 * 60 * 60
        private var countdownTimer: Timer?
        private var remainingSeconds: Int = 0

        private let prefixLabel = UILabel()
        private let suffixLabel = UILabel()
        private let timeStackView = UIStackView()
        private let hourView = TimeBoxView()
        private let minuteView = TimeBoxView()
        private let secondView = TimeBoxView()
        private let colonLabel1 = UILabel()
        private let colonLabel2 = UILabel()

        override init(frame: CGRect) {
            super.init(frame: frame)
            setupView()
        }

        deinit {
            stopCountdown()
        }

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

        // 更新倒计时显示内容
        func update(prefix: String, countdown: FAPayRetainAlertData.Countdown, suffix: String) {
            prefixLabel.text = prefix
            suffixLabel.text = suffix
            hourView.setText(countdown.hours)
            minuteView.setText(countdown.minutes)
            secondView.setText(countdown.seconds)
        }

        override func didMoveToWindow() {
            super.didMoveToWindow()
            if window != nil {
                startCountdown()
            } else {
                stopCountdown()
            }
        }

        private func setupView() {
            let mainStack = UIStackView()
            mainStack.axis = .horizontal
            mainStack.alignment = .center
            mainStack.spacing = 5

            prefixLabel.font = .font(ofSize: 12, weight: .medium)
            prefixLabel.textColor = UIColor.fa_hex(0x0F0F0F)

            suffixLabel.font = .font(ofSize: 12, weight: .medium)
            suffixLabel.textColor = UIColor.fa_hex(0x0F0F0F)

            timeStackView.axis = .horizontal
            timeStackView.alignment = .center
            timeStackView.spacing = 3

            colonLabel1.font = .font(ofSize: 12, weight: .medium)
            colonLabel1.textColor = UIColor.fa_hex(0x0F0F0F)
            colonLabel1.text = ":"

            colonLabel2.font = .font(ofSize: 12, weight: .medium)
            colonLabel2.textColor = UIColor.fa_hex(0x0F0F0F)
            colonLabel2.text = ":"

            timeStackView.addArrangedSubview(hourView)
            timeStackView.addArrangedSubview(colonLabel1)
            timeStackView.addArrangedSubview(minuteView)
            timeStackView.addArrangedSubview(colonLabel2)
            timeStackView.addArrangedSubview(secondView)

            addSubview(mainStack)
            mainStack.addArrangedSubview(prefixLabel)
            mainStack.addArrangedSubview(timeStackView)
            mainStack.addArrangedSubview(suffixLabel)

            mainStack.snp.makeConstraints { make in
                make.edges.equalToSuperview()
            }
        }

        // 每次展示时从 4 小时开始倒计时
        private func startCountdown() {
            stopCountdown()
            remainingSeconds = Self.defaultCountdownSeconds
            updateTimeLabels()
            countdownTimer = Timer.scheduledTimer(timeInterval: 1,
                                                  target: YYTextWeakProxy(target: self),
                                                  selector: #selector(handleCountdownTimer),
                                                  userInfo: nil,
                                                  repeats: true)
        }

        private func stopCountdown() {
            countdownTimer?.invalidate()
            countdownTimer = nil
        }

        @objc private func handleCountdownTimer() {
            guard remainingSeconds > 0 else {
                updateTimeLabels()
                stopCountdown()
                return
            }
            remainingSeconds -= 1
            updateTimeLabels()
        }

        private func updateTimeLabels() {
            let hours = remainingSeconds / 3600
            let minutes = (remainingSeconds % 3600) / 60
            let seconds = remainingSeconds % 60
            hourView.setText(String(format: "%02d", hours))
            minuteView.setText(String(format: "%02d", minutes))
            secondView.setText(String(format: "%02d", seconds))
        }

        private final class TimeBoxView: UIView {
            private let label = UILabel()

            override init(frame: CGRect) {
                super.init(frame: frame)
                setupView()
            }

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

            func setText(_ text: String) {
                label.text = text
            }

            private func setupView() {
                backgroundColor = UIColor.fa_hex(0x0F0F0F)
                layer.cornerRadius = 4
                layer.masksToBounds = true

                label.font = .font(ofSize: 12, weight: .medium)
                label.textColor = .FFFFFF
                label.textAlignment = .center

                addSubview(label)
                label.snp.makeConstraints { make in
                    make.center.equalToSuperview()
                }

                snp.makeConstraints { make in
                    make.width.height.equalTo(18)
                }
            }
        }
    }

    final class PayRetainBonusTagView: UIView {
        private let leftStar = UIImageView(image: UIImage(named: FAPayRetainAlertData.Assets.starIcon))
        private let rightStar = UIImageView(image: UIImage(named: FAPayRetainAlertData.Assets.starIcon))
        private let titleLabel = UILabel()

        override init(frame: CGRect) {
            super.init(frame: frame)
            setupView()
        }

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

        // 更新标签文案
        func update(text: String) {
            titleLabel.text = text
        }

        private func setupView() {
            backgroundColor = UIColor.fa_hex(0x20A1FF)
            layer.cornerRadius = 10
            layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMaxYCorner]

            titleLabel.font = .font(ofSize: 20, weight: .bold).withBoldItalic()
            titleLabel.textColor = .FFFFFF

            addSubview(leftStar)
            addSubview(rightStar)
            addSubview(titleLabel)

            leftStar.snp.makeConstraints { make in
                make.centerY.equalToSuperview()
                make.left.equalToSuperview().offset(8)
            }

            titleLabel.snp.makeConstraints { make in
                make.centerY.equalToSuperview()
                make.left.equalTo(leftStar.snp.right).offset(5)
            }

            rightStar.snp.makeConstraints { make in
                make.centerY.equalToSuperview()
                make.left.equalTo(titleLabel.snp.right).offset(5)
                make.right.equalToSuperview().offset(-8)
            }
        }
    }
}

// MARK: - Pack Cell
final class FAPayRetainPackCell: UICollectionViewCell {
    static let reuseIdentifier = "FAPayRetainPackCell"

    private lazy var bgView: UIImageView = {
        let imageView = UIImageView(image: UIImage(named: FAPayRetainAlertData.Assets.cellBackground))
        return imageView
    }()
    private let selectedBorderView = UIView()
    private let coinIconView = UIImageView(image: UIImage(named: FAPayRetainAlertData.Assets.coinIcon))
    private let coinLabel = UILabel()
    private let bonusLabel = UILabel()
    private lazy var priceView: FAGradientView = {
        let view = FAGradientView()
        view.fa_colors = [
            UIColor.fa_hex(0x3071FF).cgColor,
            UIColor.fa_hex(0x6DB6FF).cgColor
        ]
        view.fa_locations = [0, 1]
        view.fa_startPoint = .init(x: 0, y: 0.5)
        view.fa_endPoint = .init(x: 1, y: 0.5)
        view.layer.cornerRadius = FAPayRetainAlertData.Layout.priceSize.height / 2
        view.layer.masksToBounds = true
        view.layer.borderWidth = 1
        view.layer.borderColor = UIColor.fa_hex(0xFFFFFF).cgColor
        return view
    }()
    private let priceLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupView()
    }

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

    // 绑定套餐数据和选中状态
    func configure(with item: FAPayItem?, isSelected: Bool) {
        selectedBorderView.isHidden = !isSelected
        guard let item = item else { return }

        coinLabel.text = "\(item.coins ?? 0)"
        bonusLabel.text = "+\((item.ext_info?.max_total_coins_pop ?? 0) - (item.ext_info?.max_total_coins ?? 0)) " + "fableon_free_coins".localized
        priceLabel.text = "\(item.currency ?? "")\(item.price ?? "")"
    }

    private func setupView() {
        contentView.backgroundColor = .clear


        bgView.layer.cornerRadius = 15
        bgView.layer.masksToBounds = true

        selectedBorderView.layer.cornerRadius = 15
        selectedBorderView.layer.borderWidth = 2
        selectedBorderView.layer.borderColor = UIColor.fa_hex(0x1F8FFF).cgColor
        selectedBorderView.isHidden = true


        coinIconView.contentMode = .scaleAspectFit

        coinLabel.font = .font(ofSize: 22, weight: .bold)
        coinLabel.textColor = UIColor.fa_hex(0x276CFF)

        bonusLabel.font = .font(ofSize: 12, weight: .medium)
        bonusLabel.textColor = .FFFFFF



        priceLabel.font = .font(ofSize: 22, weight: .bold)
        priceLabel.textColor = .FFFFFF

        let coinStack = UIStackView(arrangedSubviews: [coinIconView, coinLabel])
        coinStack.axis = .horizontal
        coinStack.alignment = .center
        coinStack.spacing = 2

        contentView.addSubview(bgView)
        contentView.addSubview(selectedBorderView)

        bgView.addSubview(coinStack)
        bgView.addSubview(bonusLabel)
        bgView.addSubview(priceView)
        priceView.addSubview(priceLabel)

        bgView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }

        selectedBorderView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }

        coinStack.snp.makeConstraints { make in
            make.left.equalToSuperview().offset(FAPayRetainAlertData.Layout.coinStackLeft)
            make.top.equalToSuperview().offset(FAPayRetainAlertData.Layout.coinStackTop)
        }

        coinIconView.snp.makeConstraints { make in
            make.width.height.equalTo(22)
        }

        bonusLabel.snp.makeConstraints { make in
            make.left.equalTo(coinStack)
            make.top.equalTo(coinStack.snp.bottom).offset(FAPayRetainAlertData.Layout.bonusTopSpacing)
        }

        priceView.snp.makeConstraints { make in
            make.right.equalToSuperview().offset(-14)
            make.top.equalToSuperview().offset(FAPayRetainAlertData.Layout.priceTop)
            make.size.equalTo(FAPayRetainAlertData.Layout.priceSize)
        }

        priceLabel.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
    }
}

private extension UIColor {
    // 统一十六进制色值转换，便于对齐设计稿
    static func fa_hex(_ hex: UInt32, alpha: CGFloat = 1) -> UIColor {
        let red = CGFloat((hex >> 16) & 0xFF) / 255.0
        let green = CGFloat((hex >> 8) & 0xFF) / 255.0
        let blue = CGFloat(hex & 0xFF) / 255.0
        return UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }
}