//
//  PaymentCollectionDetailsViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 收款详情页，展示收款二维码、设金额、保存二维码与语音开关。
final class PaymentCollectionDetailsViewController: BaseViewController {

    private let viewModel = PaymentCollectionDetailsViewModel()
    private let paymentAPI = NetworkServices.shared.paymentAPI

    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()

    private let qrCardView = UIView()
    private let scenicNameLabel = UILabel()
    private let qrImageView = UIImageView()
    private let qrPlaceholderView = UIView()
    private let qrErrorLabel = UILabel()
    private let refreshButton = UIButton(type: .system)
    private let setAmountButton = UIButton(type: .system)
    private let saveQRButton = UIButton(type: .system)
    private let actionRow = UIStackView()

    private let infoCardView = UIView()
    private let scenicRow = PaymentInfoRowView(title: "景区名称")
    private let merchantRow = PaymentInfoRowView(title: "收款方")
    private let staffRow = PaymentInfoRowView(title: "员工 ID")

    private let recordRow = PaymentNavigationRowView(title: "收款记录")

    private let voiceCardView = UIView()
    private let voiceTitleLabel = UILabel()
    private let voiceSwitch = UISwitch()

    private var amountDialog: PaymentSetAmountDialogView?

    override func setupNavigationBar() {
        title = "收款详情"
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackground

        contentStack.axis = .vertical
        contentStack.spacing = AppSpacing.md

        qrCardView.backgroundColor = .white
        qrCardView.layer.cornerRadius = AppRadius.lg

        scenicNameLabel.font = .systemFont(ofSize: 16, weight: .medium)
        scenicNameLabel.textColor = AppColor.textPrimary
        scenicNameLabel.textAlignment = .center

        qrImageView.contentMode = .scaleAspectFit
        qrImageView.isHidden = true

        qrPlaceholderView.backgroundColor = AppColor.inputBackground
        qrPlaceholderView.layer.cornerRadius = 24
        qrPlaceholderView.isHidden = true

        qrErrorLabel.text = "未选景区或网络问题"
        qrErrorLabel.font = .systemFont(ofSize: 14)
        qrErrorLabel.textColor = AppColor.danger
        qrErrorLabel.textAlignment = .center

        refreshButton.setTitle("点击刷新", for: .normal)
        refreshButton.setTitleColor(AppColor.primary, for: .normal)
        refreshButton.titleLabel?.font = .systemFont(ofSize: 14)

        actionRow.axis = .horizontal
        actionRow.alignment = .center
        actionRow.spacing = AppSpacing.xl

        configureLinkButton(setAmountButton, title: "设置金额")
        configureLinkButton(saveQRButton, title: "保存二维码")

        infoCardView.backgroundColor = .white
        infoCardView.layer.cornerRadius = AppRadius.lg

        recordRow.backgroundColor = .white
        recordRow.layer.cornerRadius = AppRadius.lg

        voiceCardView.backgroundColor = .white
        voiceCardView.layer.cornerRadius = AppRadius.lg

        voiceTitleLabel.text = "收款到账语音提醒"
        voiceTitleLabel.font = .systemFont(ofSize: 14)
        voiceTitleLabel.textColor = UIColor(hex: 0x4B5563)

        voiceSwitch.onTintColor = AppColor.primary

        view.addSubview(scrollView)
        scrollView.addSubview(contentStack)

        contentStack.addArrangedSubview(qrCardView)
        contentStack.addArrangedSubview(infoCardView)
        contentStack.addArrangedSubview(recordRow)
        contentStack.addArrangedSubview(voiceCardView)

        let qrContentStack = UIStackView(arrangedSubviews: [
            scenicNameLabel,
            qrImageView,
            qrPlaceholderView,
            actionRow,
        ])
        qrContentStack.axis = .vertical
        qrContentStack.alignment = .center
        qrContentStack.spacing = AppSpacing.lg
        qrCardView.addSubview(qrContentStack)

        qrPlaceholderView.addSubview(qrErrorLabel)
        qrPlaceholderView.addSubview(refreshButton)

        actionRow.addArrangedSubview(setAmountButton)
        actionRow.addArrangedSubview(saveQRButton)

        let infoStack = UIStackView(arrangedSubviews: [scenicRow, merchantRow, staffRow])
        infoStack.axis = .vertical
        infoCardView.addSubview(infoStack)

        voiceCardView.addSubview(voiceTitleLabel)
        voiceCardView.addSubview(voiceSwitch)

        qrContentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 32, left: 16, bottom: 32, right: 16))
        }
        scenicNameLabel.snp.makeConstraints { make in
            make.leading.trailing.equalToSuperview()
        }
        qrImageView.snp.makeConstraints { make in
            make.width.height.equalTo(182)
        }
        qrPlaceholderView.snp.makeConstraints { make in
            make.width.height.equalTo(182)
        }
        qrErrorLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(56)
            make.leading.trailing.equalToSuperview().inset(AppSpacing.sm)
        }
        refreshButton.snp.makeConstraints { make in
            make.top.equalTo(qrErrorLabel.snp.bottom).offset(AppSpacing.xs)
            make.centerX.equalToSuperview()
        }
        infoStack.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        voiceTitleLabel.snp.makeConstraints { make in
            make.leading.equalToSuperview().inset(AppSpacing.md)
            make.centerY.equalToSuperview()
        }
        voiceSwitch.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(AppSpacing.md)
            make.centerY.equalToSuperview()
        }
        voiceCardView.snp.makeConstraints { make in
            make.height.equalTo(AppSpacing.formRowHeight)
        }
    }

    override func setupConstraints() {
        scrollView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        contentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(AppSpacing.screenHorizontalInset)
            make.width.equalTo(scrollView.snp.width).offset(-AppSpacing.screenHorizontalInset * 2)
        }
    }

    override func bindActions() {
        viewModel.onStateChange = { [weak self] in
            Task { @MainActor in self?.applyViewModel() }
        }
        viewModel.onShowMessage = { [weak self] message in
            Task { @MainActor in self?.showToast(message) }
        }

        setAmountButton.addTarget(self, action: #selector(setAmountTapped), for: .touchUpInside)
        saveQRButton.addTarget(self, action: #selector(saveQRTapped), for: .touchUpInside)
        refreshButton.addTarget(self, action: #selector(refreshTapped), for: .touchUpInside)
        recordRow.addTarget(self, action: #selector(recordTapped), for: .touchUpInside)
        voiceSwitch.addTarget(self, action: #selector(voiceSwitchChanged), for: .valueChanged)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        Task { await loadData() }
    }

    private func loadData() async {
        showLoading()
        await viewModel.loadPayCode(api: paymentAPI)
        hideLoading()
    }

    @MainActor
    private func applyViewModel() {
        scenicNameLabel.text = viewModel.displayScenicName
        scenicRow.setValue(viewModel.displayScenicName)
        merchantRow.setValue(viewModel.merchantInfo.company)
        staffRow.setValue(viewModel.staffId.isEmpty ? "-" : viewModel.staffId)
        voiceSwitch.isOn = viewModel.isVoiceBroadcastOpen

        if let image = viewModel.qrImage {
            qrImageView.image = image
            qrImageView.isHidden = false
            qrPlaceholderView.isHidden = true
            actionRow.isHidden = false
        } else {
            qrImageView.isHidden = true
            qrPlaceholderView.isHidden = false
            actionRow.isHidden = true
        }

        if viewModel.showAmountDialog {
            presentAmountDialogIfNeeded()
        } else {
            amountDialog?.dismiss()
            amountDialog = nil
        }
    }

    private func presentAmountDialogIfNeeded() {
        guard amountDialog == nil else {
            amountDialog?.apply(amount: viewModel.amount, remark: viewModel.remark)
            return
        }

        let dialog = PaymentSetAmountDialogView()
        dialog.onAmountChange = { [weak self] value in
            self?.viewModel.updateAmount(value)
        }
        dialog.onRemarkChange = { [weak self] value in
            self?.viewModel.updateRemark(value)
        }
        dialog.onConfirm = { [weak self] in
            self?.viewModel.confirmAmount()
        }
        dialog.onCancel = { [weak self] in
            self?.viewModel.hideAmountDialog()
        }
        dialog.apply(amount: viewModel.amount, remark: viewModel.remark)
        dialog.show(in: view)
        amountDialog = dialog
    }

    private func configureLinkButton(_ button: UIButton, title: String) {
        button.setTitle(title, for: .normal)
        button.setTitleColor(AppColor.primary, for: .normal)
        button.titleLabel?.font = .systemFont(ofSize: 14)
    }

    @objc private func setAmountTapped() {
        viewModel.showSetAmountDialog()
    }

    @objc private func saveQRTapped() {
        Task {
            await viewModel.saveQRCode()
        }
    }

    @objc private func refreshTapped() {
        Task {
            showLoading()
            await viewModel.refresh(api: paymentAPI)
            hideLoading()
        }
    }

    @objc private func recordTapped() {
        navigationController?.pushViewController(PaymentCollectionRecordViewController(), animated: true)
    }

    @objc private func voiceSwitchChanged() {
        viewModel.toggleReceiveVoice()
    }
}

/// 收款详情信息行。
private final class PaymentInfoRowView: UIView {

    private let titleLabel = UILabel()
    private let valueLabel = UILabel()
    private let divider = UIView()

    init(title: String) {
        super.init(frame: .zero)
        titleLabel.text = title
        setupUI()
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setValue(_ value: String) {
        valueLabel.text = value
    }

    private func setupUI() {
        titleLabel.font = .systemFont(ofSize: 14)
        titleLabel.textColor = UIColor(hex: 0x4B5563)

        valueLabel.font = .systemFont(ofSize: 14)
        valueLabel.textColor = AppColor.textPrimary
        valueLabel.textAlignment = .right
        valueLabel.numberOfLines = 2

        divider.backgroundColor = UIColor(hex: 0xE5E7EB)

        addSubview(titleLabel)
        addSubview(valueLabel)
        addSubview(divider)

        snp.makeConstraints { make in
            make.height.greaterThanOrEqualTo(AppSpacing.formRowHeight)
        }
        titleLabel.snp.makeConstraints { make in
            make.leading.equalToSuperview().inset(AppSpacing.md)
            make.centerY.equalToSuperview()
            make.width.equalTo(102)
        }
        valueLabel.snp.makeConstraints { make in
            make.leading.equalTo(titleLabel.snp.trailing).offset(AppSpacing.xs)
            make.trailing.equalToSuperview().inset(AppSpacing.md)
            make.top.bottom.equalToSuperview().inset(AppSpacing.sm)
        }
        divider.snp.makeConstraints { make in
            make.leading.trailing.bottom.equalToSuperview()
            make.height.equalTo(0.5)
        }
    }
}

/// 可点击导航行。
private final class PaymentNavigationRowView: UIControl {

    private let titleLabel = UILabel()
    private let chevronView = UIImageView()

    init(title: String) {
        super.init(frame: .zero)
        titleLabel.text = title
        setupUI()
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupUI() {
        titleLabel.font = .systemFont(ofSize: 14)
        titleLabel.textColor = UIColor(hex: 0x4B5563)

        chevronView.image = UIImage(systemName: "chevron.right")
        chevronView.tintColor = AppColor.textSecondary
        chevronView.contentMode = .scaleAspectFit

        addSubview(titleLabel)
        addSubview(chevronView)

        snp.makeConstraints { make in
            make.height.equalTo(AppSpacing.formRowHeight)
        }
        titleLabel.snp.makeConstraints { make in
            make.leading.equalToSuperview().inset(AppSpacing.md)
            make.centerY.equalToSuperview()
        }
        chevronView.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(AppSpacing.md)
            make.centerY.equalToSuperview()
            make.width.height.equalTo(16)
        }
    }
}