import IQKeyboardCore
import IQKeyboardManagerSwift
import SnapKit
import UIKit

/// 简洁两步注销页面；一次确认两项资产，短信和实际申请仍由用户主动操作。
@MainActor
final class StoreAccountDeregistrationViewController: BaseViewController {
    private typealias Style = StoreAccountDeregistrationStyle
    private let viewModel: StoreAccountDeregistrationViewModel
    private let api: any StoreAccountDeregistrationServing
    private let identityName: String
    private let readOnly: Bool
    private let onUnresolvedSubmission: (() -> Void)?
    private let onSubmissionAccepted: (String?) -> Void
    private var didHandleAcceptedSubmission = false
    private let scrollView = UIScrollView()
    private let refreshControl = UIRefreshControl()
    private let content = UIStackView()
    private let bottomBar = UIView()
    private let steps = UIStackView()
    private let firstStepNumber = Style.label("1", size: 11, weight: .semibold)
    private let secondStepNumber = Style.label("2", size: 11, weight: .semibold)
    private let firstStep = Style.label("确认资产", size: 13, weight: .semibold)
    private let secondStep = Style.label("手机验证", size: 13, weight: .semibold)
    private let firstStepView = UIView()
    private let secondStepView = UIView()
    private let heading = Style.label(size: 24, weight: .semibold)
    private let subtitle = Style.label(size: 14, color: Style.textSecondary)
    private let conditionStack = UIStackView()
    private let verificationStack = UIStackView()
    private let walletAmount = Style.label("—", size: 28, weight: .semibold)
    private let pointsAmount = Style.label("—", size: 28, weight: .semibold)
    private let walletState = Style.label(size: 12, color: Style.textSecondary)
    private let pointsState = Style.label(size: 12, color: Style.textSecondary)
    private let assetHint = Style.label(size: 13, color: Style.textSecondary)
    private let blockersLabel = Style.label(size: 14, color: Style.textSecondary)
    private let riskLabel = Style.label(size: 13, color: AppColor.warning)
    private let statusLabel = Style.label(size: 13, color: Style.textSecondary)
    private let errorLabel = Style.label(size: 14, color: Style.danger)
    private let codeField = UITextField()
    private let reasonField = UITextView()
    private let reasonTitle = Style.label(size: 16, weight: .semibold)
    private let reasonPlaceholder = Style.label("请填写注销原因", size: 14, color: Style.textSecondary)
    private let reasonCount = Style.label("0/50", size: 12, color: Style.textSecondary)
    private let reasonValidationLabel = Style.label("请填写注销原因", size: 12, color: Style.danger)
    private let reasonContainer = UIView()
    private let smsButton = UIButton(type: .system)
    private let continueButton = Style.button("确认资产并继续", id: "deregister.continue")
    private let submitButton = Style.button("提交注销申请", id: "deregister.submit")
    private var identityCard = UIView()
    private var blockersCard = UIView()
    private var errorCard = UIView()
    private var actionTask: Task<Void, Never>?
    private var previousPopGestureEnabled: Bool?
    private var previousViewportHeight: CGFloat = 0
    private var reasonWasBlurred = false

    /// 注入当前身份及旧接口，不读取任意手机号，也不自动确认资产。
    init(identityName: String, viewModel: StoreAccountDeregistrationViewModel,
         api: any StoreAccountDeregistrationServing, readOnly: Bool = false,
         onUnresolvedSubmission: (() -> Void)? = nil,
         onSubmissionAccepted: ((String?) -> Void)? = nil) {
        let frozenIdentityName = identityName
        self.onSubmissionAccepted = onSubmissionAccepted ?? { coolingUntil in
            var userInfo = [NotificationUserInfoKey.deregistrationIdentityName: frozenIdentityName]
            if let coolingUntil { userInfo[NotificationUserInfoKey.deregistrationCoolingUntil] = coolingUntil }
            NotificationCenter.default.post(
                name: NotificationName.storeAccountDeregistrationSubmitted,
                object: nil,
                userInfo: userInfo
            )
        }
        self.identityName = identityName
        self.viewModel = viewModel
        self.api = api
        self.readOnly = readOnly
        self.onUnresolvedSubmission = onUnresolvedSubmission
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = readOnly ? "注销条件" : "注销账号"
    }

    override func setupUI() {
        view.backgroundColor = Style.pageBackground
        view.addSubview(scrollView)
        refreshControl.accessibilityIdentifier = "deregister.refresh"
        refreshControl.accessibilityLabel = "下拉刷新"
        refreshControl.tintColor = .clear
        refreshControl.addTarget(self, action: #selector(refreshTapped), for: .valueChanged)
        scrollView.refreshControl = refreshControl
        scrollView.addSubview(content)
        content.axis = .vertical
        content.spacing = 16
        content.addArrangedSubview(steps)
        steps.axis = .horizontal
        steps.alignment = .fill
        steps.distribution = .fillEqually
        steps.spacing = 12
        configureStep(firstStepView, number: firstStepNumber, title: firstStep,
                      identifier: "deregister.step.assets", accessibilityLabel: "第 1 步，确认资产")
        configureStep(secondStepView, number: secondStepNumber, title: secondStep,
                      identifier: "deregister.step.verification", accessibilityLabel: "第 2 步，手机验证")
        steps.addArrangedSubview(firstStepView)
        steps.addArrangedSubview(secondStepView)
        steps.snp.makeConstraints { $0.height.equalTo(46) }
        steps.isHidden = readOnly
        content.addArrangedSubview(Style.stack([heading, subtitle], spacing: 8))
        let identityText = Style.stack([
            Style.label("当前门店身份", size: 12, color: Style.textSecondary),
            Style.label(identityName, size: 17, weight: .semibold)
        ], spacing: 5)
        let identityRow = UIStackView(arrangedSubviews: [Style.icon("person.crop.circle"), identityText])
        identityRow.axis = .horizontal
        identityRow.alignment = .center
        identityRow.spacing = 12
        identityCard = Style.card(identityRow)
        content.addArrangedSubview(identityCard)
        conditionStack.axis = .vertical
        conditionStack.spacing = 16
        verificationStack.axis = .vertical
        verificationStack.spacing = 16
        buildConditions()
        buildVerification()
        content.addArrangedSubview(conditionStack)
        content.addArrangedSubview(verificationStack)
        errorCard = Style.card(errorLabel)
        errorCard.backgroundColor = UIColor(hex: 0xFFF1F1)
        content.addArrangedSubview(errorCard)
        content.addArrangedSubview(statusLabel)
        statusLabel.accessibilityIdentifier = "deregister.status"
        errorLabel.accessibilityIdentifier = "deregister.error"

        view.addSubview(bottomBar)
        bottomBar.backgroundColor = .white
        let actions = Style.stack([continueButton, submitButton], spacing: 10)
        bottomBar.addSubview(actions)
        actions.snp.makeConstraints { $0.edges.equalToSuperview().inset(UIEdgeInsets(top: 12, left: 16, bottom: 12, right: 16)) }
        bottomBar.isHidden = readOnly
        continueButton.addTarget(self, action: #selector(continueTapped), for: .touchUpInside)
        submitButton.addTarget(self, action: #selector(submitTapped), for: .touchUpInside)
        scrollView.keyboardDismissMode = .onDrag
        scrollView.alwaysBounceVertical = true
    }

    private func configureStep(_ container: UIView, number: UILabel, title: UILabel,
                               identifier: String, accessibilityLabel: String) {
        number.numberOfLines = 1
        title.numberOfLines = 1
        number.textAlignment = .center
        number.layer.cornerRadius = 10
        number.clipsToBounds = true
        number.snp.makeConstraints { $0.width.height.equalTo(20) }
        let row = UIStackView(arrangedSubviews: [number, title])
        row.axis = .horizontal
        row.alignment = .center
        row.spacing = 7
        title.setContentCompressionResistancePriority(.required, for: .horizontal)
        container.layer.cornerRadius = 12
        container.accessibilityIdentifier = identifier
        container.isAccessibilityElement = true
        container.accessibilityLabel = accessibilityLabel
        container.addSubview(row)
        row.snp.makeConstraints { $0.center.equalToSuperview() }
    }

    private func buildConditions() {
        let columns = UIStackView()
        columns.axis = .horizontal
        columns.distribution = .fill
        columns.spacing = 16
        let walletColumn = Style.stack([
            Style.label("现金余额", size: 13, color: Style.textSecondary), walletAmount, walletState
        ], spacing: 8)
        columns.addArrangedSubview(walletColumn)
        let divider = UIView()
        divider.backgroundColor = Style.border
        divider.snp.makeConstraints { $0.width.equalTo(1) }
        columns.addArrangedSubview(divider)
        let pointsColumn = Style.stack([
            Style.label("积分", size: 13, color: Style.textSecondary), pointsAmount, pointsState
        ], spacing: 8)
        columns.addArrangedSubview(pointsColumn)
        walletColumn.snp.makeConstraints { $0.width.equalTo(pointsColumn) }
        walletAmount.adjustsFontSizeToFitWidth = true
        walletAmount.minimumScaleFactor = 0.6
        walletAmount.numberOfLines = 1
        pointsAmount.adjustsFontSizeToFitWidth = true
        pointsAmount.minimumScaleFactor = 0.6
        pointsAmount.numberOfLines = 1
        walletState.accessibilityIdentifier = "deregister.wallet.state"
        pointsState.accessibilityIdentifier = "deregister.points.state"
        let assets = Style.card(Style.stack([
            Style.label("账号资产", size: 16, weight: .semibold), columns, assetHint
        ], spacing: 16))
        assets.accessibilityIdentifier = "deregister.assets"
        conditionStack.addArrangedSubview(assets)
        blockersLabel.accessibilityIdentifier = "deregister.blockers"
        blockersCard = Style.card(Style.stack([
            Style.label("待处理事项", size: 16, weight: .semibold), blockersLabel, riskLabel
        ]))
        conditionStack.addArrangedSubview(blockersCard)
        let notices = Style.stack([
            notice("person.crop.circle", title: "仅注销当前身份"),
            notice("clock", title: "7 天冷静期"),
            notice("exclamationmark.shield", title: "正式完成后不可恢复")
        ], spacing: 16)
        conditionStack.addArrangedSubview(Style.card(notices, background: Style.infoBackground))
    }

    private func notice(_ icon: String, title: String) -> UIView {
        let image = Style.icon(icon, size: 18)
        image.snp.makeConstraints { $0.width.equalTo(22) }
        let row = UIStackView(arrangedSubviews: [image, Style.label(title, size: 14, weight: .medium)])
        row.axis = .horizontal
        row.alignment = .center
        row.spacing = 10
        return row
    }

    private func buildVerification() {
        codeField.placeholder = "请输入短信验证码"
        codeField.keyboardType = .numberPad
        codeField.textContentType = .oneTimeCode
        codeField.accessibilityIdentifier = "deregister.code"
        codeField.accessibilityLabel = "短信验证码"
        reasonField.accessibilityIdentifier = "deregister.reason"
        reasonField.accessibilityLabel = "注销原因，必填"
        codeField.font = .systemFont(ofSize: 16)
        codeField.autocorrectionType = .no
        codeField.iq.enableMode = .disabled
        codeField.addTarget(self, action: #selector(inputChanged), for: .editingChanged)
        codeField.addTarget(self, action: #selector(revealFocusedInput), for: .editingDidBegin)
        reasonField.font = .systemFont(ofSize: 15)
        reasonField.textColor = Style.textPrimary
        reasonField.backgroundColor = .clear
        reasonField.delegate = self
        reasonField.autocorrectionType = .no
        reasonField.iq.enableMode = .disabled
        reasonField.textContainerInset = .init(top: 12, left: 12, bottom: 24, right: 12)
        codeField.snp.makeConstraints { $0.height.equalTo(50) }
        reasonField.snp.makeConstraints { $0.height.equalTo(96) }
        smsButton.setTitle("获取验证码", for: .normal)
        smsButton.titleLabel?.font = .systemFont(ofSize: 14, weight: .medium)
        smsButton.accessibilityIdentifier = "deregister.sms"
        smsButton.setContentHuggingPriority(.required, for: .horizontal)
        smsButton.setContentCompressionResistancePriority(.required, for: .horizontal)
        smsButton.addTarget(self, action: #selector(smsTapped), for: .touchUpInside)
        smsButton.snp.makeConstraints { $0.height.greaterThanOrEqualTo(44) }
        let codeRow = UIStackView(arrangedSubviews: [codeField, smsButton])
        codeRow.axis = .horizontal
        codeRow.alignment = .center
        codeRow.spacing = 12
        codeRow.layoutMargins = .init(top: 0, left: 14, bottom: 0, right: 8)
        codeRow.isLayoutMarginsRelativeArrangement = true
        codeRow.layer.cornerRadius = 10
        codeRow.layer.borderWidth = 1
        codeRow.layer.borderColor = Style.border.cgColor
        let smsTitle = Style.label("短信验证码", size: 16, weight: .semibold)
        reasonContainer.layer.cornerRadius = 10
        reasonContainer.layer.borderWidth = 1
        reasonContainer.layer.borderColor = Style.border.cgColor
        reasonContainer.addSubview(reasonField)
        reasonContainer.addSubview(reasonPlaceholder)
        reasonContainer.addSubview(reasonCount)
        reasonField.snp.makeConstraints { $0.edges.equalToSuperview() }
        reasonPlaceholder.snp.makeConstraints { $0.top.leading.equalToSuperview().inset(16) }
        reasonCount.snp.makeConstraints { $0.trailing.bottom.equalToSuperview().inset(12) }
        let titleText = NSMutableAttributedString(
            string: "注销原因 ",
            attributes: [.font: UIFont.systemFont(ofSize: 16, weight: .semibold), .foregroundColor: Style.textPrimary]
        )
        titleText.append(NSAttributedString(
            string: "*",
            attributes: [.font: UIFont.systemFont(ofSize: 16, weight: .semibold), .foregroundColor: Style.danger]
        ))
        reasonTitle.attributedText = titleText
        reasonTitle.accessibilityLabel = "注销原因，必填"
        reasonTitle.accessibilityIdentifier = "deregister.reason.title"
        reasonValidationLabel.isHidden = true
        reasonValidationLabel.accessibilityIdentifier = "deregister.reason.error"
        let form = Style.stack([smsTitle, codeRow, reasonTitle, reasonContainer, reasonValidationLabel], spacing: 12)
        form.setCustomSpacing(18, after: codeRow)
        verificationStack.addArrangedSubview(Style.card(form))
        let helperIcon = Style.icon("shield", size: 16)
        helperIcon.tintColor = Style.textSecondary
        helperIcon.snp.makeConstraints { $0.width.equalTo(22) }
        let helper = UIStackView(arrangedSubviews: [
            helperIcon,
            Style.label("验证码将发送至当前身份绑定的手机号。", size: 13, color: Style.textSecondary)
        ])
        helper.axis = .horizontal
        helper.alignment = .center
        helper.spacing = 8
        verificationStack.addArrangedSubview(helper)
    }

    override func setupConstraints() {
        bottomBar.snp.makeConstraints {
            $0.leading.trailing.equalToSuperview()
            $0.bottom.equalTo(view.keyboardLayoutGuide.snp.top)
        }
        scrollView.snp.makeConstraints {
            $0.top.leading.trailing.equalTo(view.safeAreaLayoutGuide)
            if readOnly { $0.bottom.equalTo(view.safeAreaLayoutGuide) }
            else { $0.bottom.equalTo(bottomBar.snp.top) }
        }
        content.snp.makeConstraints {
            $0.edges.equalTo(scrollView.contentLayoutGuide).inset(16)
            $0.width.equalTo(scrollView.frameLayoutGuide).offset(-32)
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        applyViewModel()
        refreshTapped()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        previousPopGestureEnabled = navigationController?.interactivePopGestureRecognizer?.isEnabled
        applyViewModel()
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        if let previousPopGestureEnabled {
            navigationController?.interactivePopGestureRecognizer?.isEnabled = previousPopGestureEnabled
        }
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        guard scrollView.bounds.height != previousViewportHeight else { return }
        previousViewportHeight = scrollView.bounds.height
        revealFocusedInput()
    }

    @objc private func revealFocusedInput() {
        guard let field = ([codeField, reasonField] as [UIView]).first(where: \.isFirstResponder) else { return }
        let rect = field.convert(field.bounds, to: scrollView).insetBy(dx: 0, dy: -12)
        scrollView.scrollRectToVisible(rect, animated: false)
    }

    private func applyViewModel() {
        let busy = actionTask != nil || viewModel.isBusy
        let verifying = viewModel.step == .verification && !readOnly
        let unresolved = viewModel.step == .unresolvedRequest && !readOnly
        heading.text = readOnly ? "当前注销条件" : (verifying ? "验证绑定手机号" : "注销前，请确认")
        subtitle.text = verifying ? "完成验证后，即可提交注销申请。" : "仅注销此身份，其他身份不受影响。"
        applyStepStyle(firstStepView, number: firstStepNumber, title: firstStep, selected: !verifying)
        applyStepStyle(secondStepView, number: secondStepNumber, title: secondStep, selected: verifying)
        identityCard.isHidden = verifying || unresolved
        conditionStack.isHidden = verifying || unresolved
        verificationStack.isHidden = !verifying
        continueButton.isHidden = verifying || readOnly
        submitButton.isHidden = !verifying
        continueButton.configuration?.title = viewModel.requiresAssetConfirmation ? "确认资产并继续" : "下一步"
        continueButton.isEnabled = !busy && viewModel.canConfirmAssetsAndContinue
        submitButton.isEnabled = !busy && viewModel.canContinue && hasVerificationInput
        smsButton.isEnabled = !busy && viewModel.canContinue
        codeField.isEnabled = !busy
        reasonField.isEditable = !busy
        applyReasonInputStyle()
        refreshControl.isEnabled = !busy
        errorLabel.text = viewModel.errorMessage
        errorCard.isHidden = viewModel.errorMessage == nil

        if let value = viewModel.eligibility {
            walletAmount.text = "¥\(value.walletBalance)"
            pointsAmount.text = "\(value.pointsBalance)"
            walletState.text = value.walletWaived ? "已确认放弃" : "待确认放弃"
            pointsState.text = value.pointsWaived ? "已确认放弃" : "待确认放弃"
            walletState.textColor = value.walletWaived ? Style.primary : Style.textSecondary
            pointsState.textColor = value.pointsWaived ? Style.primary : Style.textSecondary
            let assetIssues = value.blockers.filter(\.isAssetConfirmation)
            let needsAssetHint = readOnly || assetIssues.contains { $0.code == "WAIVER_STALE" }
            assetHint.isHidden = !needsAssetHint
            assetHint.text = readOnly ? "以当前查询结果为准，冷静期内不能再次确认资产。"
                : "资产已变化，请按最新金额重新确认。"
            blockersCard.isHidden = value.businessBlockers.isEmpty
            blockersLabel.text = value.businessBlockers.map { "• \($0.message)\n  \($0.guidance)" }.joined(separator: "\n\n")
            riskLabel.text = value.eligibleAt.map { "业务风险期预计结束：\($0)" }
            riskLabel.isHidden = value.eligibleAt == nil
        } else {
            walletAmount.text = "—"
            pointsAmount.text = "—"
            walletState.text = "待查询"
            pointsState.text = "待查询"
            assetHint.isHidden = false
            assetHint.text = busy ? "正在查询资产与注销条件…" : "暂未获取到资产，请刷新重试。"
            blockersCard.isHidden = true
        }
        statusLabel.text = unresolved ? "申请状态待确认，请刷新后重试，暂勿重复提交。"
            : (viewModel.status?.isCancelled == true ? "上次申请已撤销，可重新申请。" : nil)
        statusLabel.isHidden = statusLabel.text == nil
        let preventsBack = busy || unresolved || (!readOnly && viewModel.submissionAttempted)
        navigationItem.hidesBackButton = preventsBack
        if view.window != nil {
            navigationController?.interactivePopGestureRecognizer?.isEnabled = !preventsBack && (previousPopGestureEnabled ?? true)
        }
    }

    private func applyStepStyle(_ container: UIView, number: UILabel, title: UILabel, selected: Bool) {
        container.backgroundColor = selected ? Style.primary : UIColor(hex: 0xE9EEF5)
        container.accessibilityTraits = selected ? [.selected] : []
        number.backgroundColor = selected ? UIColor.white.withAlphaComponent(0.2) : UIColor(hex: 0xDCE3EC)
        number.textColor = selected ? .white : Style.textSecondary
        title.textColor = selected ? .white : Style.textSecondary
    }

    private var hasVerificationInput: Bool {
        let code = (codeField.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
        let reason = (reasonField.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
        return !code.isEmpty && !reason.isEmpty && reason.count <= 50
    }

    private func applyReasonInputStyle() {
        let missing = (reasonField.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
        let invalid = reasonWasBlurred && missing
        reasonContainer.layer.borderColor = reasonField.isFirstResponder
            ? Style.primary.cgColor
            : (invalid ? Style.danger.cgColor : Style.border.cgColor)
        reasonValidationLabel.isHidden = !invalid
    }

    private func run(_ operation: @escaping @MainActor () async -> Void) {
        guard actionTask == nil, !didHandleAcceptedSubmission else {
            refreshControl.endRefreshing()
            return
        }
        actionTask = Task { @MainActor [weak self] in
            guard let self else { return }
            self.showLoading()
            await operation()
            self.hideLoading()
            self.refreshControl.endRefreshing()
            self.actionTask = nil
            if !self.readOnly, self.viewModel.submissionAccepted {
                self.didHandleAcceptedSubmission = true
                self.onSubmissionAccepted(self.viewModel.submittedCoolingUntil)
                return
            }
            self.applyViewModel()
            if !self.readOnly, self.viewModel.submissionAttempted || self.viewModel.status?.isCooling == true {
                self.onUnresolvedSubmission?()
            }
        }
        applyViewModel()
    }

    @objc private func inputChanged() { applyViewModel() }
    @objc private func refreshTapped() { run { [self] in await self.viewModel.refresh(api: self.api) } }

    @objc private func continueTapped() {
        guard !readOnly, viewModel.canConfirmAssetsAndContinue, let snapshot = viewModel.eligibility else { return }
        if !viewModel.requiresAssetConfirmation {
            run { [self] in await self.viewModel.confirmAssetsAndContinue(snapshot: snapshot, api: self.api) }
            return
        }
        let sheet = StoreAccountDeregistrationConfirmationSheetViewController(
            title: "确认放弃账号资产",
            summaries: [
                .init(icon: "person.crop.circle", title: "当前身份", value: identityName),
                .init(icon: "banknote", title: "现金余额", value: "¥\(snapshot.walletBalance)"),
                .init(icon: "star.circle", title: "积分", value: "\(snapshot.pointsBalance)")
            ],
            notices: [],
            cancelTitle: "暂不确认", confirmTitle: "确认放弃"
        ) { [weak self] in
            guard let self else { return }
            self.run { [self] in await self.viewModel.confirmAssetsAndContinue(snapshot: snapshot, api: self.api) }
        }
        present(sheet, animated: true)
    }

    @objc private func smsTapped() {
        guard !readOnly else { return }
        run { [self] in
            if await self.viewModel.sendSMS(api: self.api) { showToast("验证码已发送至当前身份绑定手机号") }
        }
    }

    @objc private func submitTapped() {
        guard !readOnly, viewModel.canContinue, hasVerificationInput else { return }
        let code = codeField.text ?? ""
        let reason = (reasonField.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
        view.endEditing(true)
        let sheet = StoreAccountDeregistrationConfirmationSheetViewController(
            title: "确认提交注销申请？",
            summaries: [
                .init(icon: "person.crop.circle", title: "当前身份", value: identityName),
                .init(icon: "clock", title: "冷静期", value: "7 天"),
                .init(icon: "text.bubble", title: "注销原因", value: reason)
            ],
            notices: [
                ("info.circle", "注销后当前身份将无法使用", false),
                ("checkmark.shield", "冷静期内可撤销，重新登录该身份自动撤销申请", false),
                ("exclamationmark.circle.fill", "正式完成后不可恢复，历史记录保留", true)
            ],
            cancelTitle: "我再想想", confirmTitle: "确认提交"
        ) { [weak self] in
            self?.submitConfirmedApplication(smsCode: code, reason: reason)
        }
        present(sheet, animated: true)
    }

    /// 用户确认最终弹窗后提交；仅明确成功触发一次退出态结果页，未知结果仍进入核验流程。
    func submitConfirmedApplication(smsCode: String, reason: String) {
        guard !readOnly, viewModel.validateSubmissionInput(smsCode: smsCode, reason: reason) else {
            applyViewModel()
            return
        }
        run { [self] in await viewModel.submit(smsCode: smsCode, reason: reason, api: api) }
    }
}

extension StoreAccountDeregistrationViewController: UITextViewDelegate {
    /// 注销原因必填；限制长度并同步必填状态、占位和计数展示。
    func textViewDidChange(_ textView: UITextView) {
        if textView.text.count > 50 {
            textView.text = String(textView.text.prefix(50))
        }
        reasonPlaceholder.isHidden = !textView.text.isEmpty
        reasonCount.text = "\(textView.text.count)/50"
        if !textView.text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
            reasonWasBlurred = false
        }
        applyViewModel()
    }

    func textViewDidBeginEditing(_ textView: UITextView) {
        applyReasonInputStyle()
        revealFocusedInput()
    }

    func textViewDidEndEditing(_ textView: UITextView) {
        reasonWasBlurred = true
        applyReasonInputStyle()
    }
}