import Kingfisher
import SnapKit
import UIKit

/// AI 修图任务详情页，按设计稿展示状态总览、相册信息、任务内容与逐输出处理明细。
final class TravelAlbumAIJobDetailViewController: BaseViewController {
    private let viewModel: TravelAlbumAIJobDetailViewModel
    private let api: any TravelAlbumServing
    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let refreshControl = UIRefreshControl()
    private let emptyView = AIJobDetailEmptyView()
    private var pollingTask: Task<Void, Never>?
    private var isVisible = false
    private var isPresentingLoading = false

    /// 创建指定批次的任务详情。
    init(batchId: Int, api: (any TravelAlbumServing)? = nil) {
        viewModel = TravelAlbumAIJobDetailViewModel(batchId: batchId)
        self.api = api ?? NetworkServices.shared.travelAlbumAPI
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        let titleLabel = UILabel()
        titleLabel.text = "任务详情"
        titleLabel.textColor = AIJobDetailStyle.textPrimary
        titleLabel.font = .systemFont(ofSize: 20, weight: .semibold)
        navigationItem.titleView = titleLabel
        navigationItem.backButtonDisplayMode = .minimal
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            image: UIImage(systemName: "arrow.clockwise"),
            style: .plain,
            target: self,
            action: #selector(manualRefresh)
        )
        navigationItem.rightBarButtonItem?.tintColor = AIJobDetailStyle.textPrimary
        navigationItem.rightBarButtonItem?.accessibilityLabel = "刷新任务详情"
        let appearance = UINavigationBarAppearance()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = .white
        appearance.shadowColor = .clear
        navigationItem.standardAppearance = appearance
        navigationItem.scrollEdgeAppearance = appearance
        navigationItem.compactAppearance = appearance
        navigationController?.setNavigationBarHidden(false, animated: false)
    }

    override func setupUI() {
        view.backgroundColor = AIJobDetailStyle.pageBackground
        scrollView.backgroundColor = .clear
        scrollView.alwaysBounceVertical = true
        scrollView.refreshControl = refreshControl
        contentStack.axis = .vertical
        contentStack.spacing = 14
        emptyView.onRetry = { [weak self] in self?.reload() }
        view.addSubview(scrollView)
        scrollView.addSubview(contentStack)
        view.addSubview(emptyView)
    }

    override func setupConstraints() {
        scrollView.snp.makeConstraints { $0.edges.equalToSuperview() }
        contentStack.snp.makeConstraints { make in
            make.top.equalTo(scrollView.contentLayoutGuide).offset(12)
            make.leading.trailing.equalTo(scrollView.frameLayoutGuide).inset(18)
            make.bottom.equalTo(scrollView.contentLayoutGuide).inset(24)
        }
        emptyView.snp.makeConstraints { $0.edges.equalToSuperview() }
    }

    override func bindActions() {
        refreshControl.addTarget(self, action: #selector(refreshTriggered), for: .valueChanged)
        viewModel.onStateChange = { [weak self] in Task { @MainActor in self?.applyState() } }
        viewModel.onShowMessage = { [weak self] message in Task { @MainActor in self?.showToast(message) } }
        viewModel.onNotFound = { [weak self] in Task { @MainActor in self?.presentNotFound() } }
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(applicationBecameActive),
            name: UIApplication.didBecomeActiveNotification,
            object: nil
        )
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(applicationEnteredBackground),
            name: UIApplication.didEnterBackgroundNotification,
            object: nil
        )
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        Task { await viewModel.load(api: api) }
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        isVisible = true
        updateLoadingPresentation()
        updatePolling()
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        isVisible = false
        setLoadingPresented(false)
        stopPolling()
    }

    deinit {
        pollingTask?.cancel()
        NotificationCenter.default.removeObserver(self)
    }

    @MainActor
    private func applyState() {
        refreshControl.endRefreshing()
        let unavailable = viewModel.detail == nil && !viewModel.isLoading
        emptyView.isHidden = !unavailable
        emptyView.apply(
            title: "任务详情加载失败",
            message: viewModel.errorMessage ?? "暂时无法获取任务信息，请稍后重试。"
        )
        scrollView.isHidden = viewModel.detail == nil
        if let detail = viewModel.detail { rebuildContent(detail) }
        updateLoadingPresentation()
        updatePolling()
    }

    @MainActor
    private func rebuildContent(_ detail: TravelAlbumAIJobDetail) {
        contentStack.arrangedSubviews.forEach {
            contentStack.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }

        let statusCard = AIJobDetailStatusCard()
        statusCard.apply(detail)
        contentStack.addArrangedSubview(statusCard)

        let albumCard = AIJobDetailAlbumCard()
        albumCard.apply(detail)
        contentStack.addArrangedSubview(albumCard)

        let contentCard = AIJobDetailContentCard()
        contentCard.apply(detail)
        contentStack.addArrangedSubview(contentCard)

        let processingCard = AIJobDetailProcessingCard()
        processingCard.apply(
            detail.targets,
            onViewResult: { [weak self] target in self?.openResult(target) }
        )
        contentStack.addArrangedSubview(processingCard)

        let albumButton = AIJobDetailAlbumButton()
        albumButton.addTarget(self, action: #selector(openAlbumTapped), for: .touchUpInside)
        contentStack.addArrangedSubview(albumButton)
        albumButton.snp.makeConstraints { $0.height.equalTo(56) }
    }

    @MainActor
    private func updateLoadingPresentation() {
        setLoadingPresented(isVisible && viewModel.isLoading && viewModel.detail == nil)
    }

    @MainActor
    private func setLoadingPresented(_ presented: Bool) {
        guard isPresentingLoading != presented else { return }
        isPresentingLoading = presented
        presented ? showLoading() : hideLoading()
    }

    private func reload() { Task { await viewModel.load(api: api) } }

    @objc private func refreshTriggered() { Task { await viewModel.load(api: api, refreshing: true) } }
    @objc private func manualRefresh() { Task { await viewModel.load(api: api, refreshing: true) } }
    @objc private func applicationBecameActive() { updatePolling() }
    @objc private func applicationEnteredBackground() { stopPolling() }
    @objc private func openAlbumTapped() { openAlbum() }

    private func updatePolling() {
        guard isVisible,
              UIApplication.shared.applicationState == .active,
              viewModel.shouldPoll,
              pollingTask == nil
        else {
            if !viewModel.shouldPoll { stopPolling() }
            return
        }
        pollingTask = Task { [weak self] in
            while !Task.isCancelled {
                try? await Task.sleep(for: .seconds(8))
                guard !Task.isCancelled, let self else { break }
                await self.viewModel.load(api: self.api, silent: true)
            }
        }
    }

    private func stopPolling() {
        pollingTask?.cancel()
        pollingTask = nil
    }

    @MainActor
    private func presentNotFound() {
        guard presentedViewController == nil else { return }
        let alert = UIAlertController(title: nil, message: "任务不存在或已失效", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "知道了", style: .default) { [weak self] _ in
            self?.replaceWithTaskList()
        })
        present(alert, animated: true)
    }

    private func replaceWithTaskList() {
        guard let navigationController else { return }
        if let existing = navigationController.viewControllers.first(where: { $0 is TravelAlbumAIJobListViewController }) {
            navigationController.popToViewController(existing, animated: true)
            return
        }
        var stack = navigationController.viewControllers.filter { $0 !== self }
        stack.append(TravelAlbumAIJobListViewController(api: api))
        navigationController.setViewControllers(stack, animated: true)
    }

    private func openAlbum() {
        guard let id = viewModel.detail?.userEquityTravelId, id > 0 else { return }
        navigationController?.pushViewController(TravelAlbumDetailViewController(albumId: id, api: api), animated: true)
    }

    private func openResult(_ target: TravelAlbumAIJobTarget) {
        guard let kind = target.outputType.previewKind,
              let asset = target.resultAsset,
              !asset.url.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
        else {
            showToast("结果资源已失效")
            return
        }
        Task {
            var project: TravelAlbumPreviewProject
            if kind == .cover {
                project = TravelAlbumPreviewProject(
                    originalMaterialId: asset.materialId,
                    aiRetouchBatchId: viewModel.batchId,
                    assets: [TravelAlbumPreviewAsset(
                        id: "cover-\(asset.id)",
                        kind: .cover,
                        fileURL: asset.url,
                        coverURL: asset.thumbnailURL,
                        fileName: "AI封面",
                        fileSize: 0
                    )]
                )
            } else if let materialId = target.sourceMaterial?.id {
                do {
                    let material = try await api.materialInfo(
                        userEquityTravelId: viewModel.detail?.userEquityTravelId ?? 0,
                        materialId: materialId
                    )
                    let current = TravelAlbumPreviewProject(material: material)
                    let result = TravelAlbumPreviewAsset(
                        id: "job-result-\(asset.id)",
                        kind: kind,
                        fileURL: asset.url,
                        coverURL: asset.thumbnailURL,
                        fileName: material.fileName,
                        fileSize: material.fileSize
                    )
                    project = TravelAlbumPreviewProject(
                        originalMaterialId: material.id,
                        aiRetouchBatchId: viewModel.batchId,
                        assets: current.assets + [result]
                    )
                } catch {
                    await MainActor.run { self.showToast("结果资源加载失败，请前往相册查看") }
                    return
                }
            } else {
                await MainActor.run { self.showToast("结果资源已失效") }
                return
            }
            await MainActor.run {
                self.present(
                    TravelAlbumPhotoPreviewViewController(
                        projects: [project],
                        totalCount: 1,
                        startProjectIndex: 0,
                        startKind: kind,
                        allowsActions: false
                    ),
                    animated: true
                )
            }
        }
    }
}

/// AI 修图详情页专用视觉常量。
private enum AIJobDetailStyle {
    static let pageBackground = UIColor(hex: 0xF5F7FB)
    static let textPrimary = UIColor(hex: 0x111827)
    static let textSecondary = UIColor(hex: 0x64748B)
    static let border = UIColor(hex: 0xE4EAF3)

    static func styleCard(_ view: UIView) {
        view.backgroundColor = .white
        view.layer.cornerRadius = 14
        view.layer.borderWidth = 1
        view.layer.borderColor = border.cgColor
        view.layer.shadowColor = UIColor(hex: 0x315B94).withAlphaComponent(0.08).cgColor
        view.layer.shadowOpacity = 1
        view.layer.shadowRadius = 8
        view.layer.shadowOffset = CGSize(width: 0, height: 3)
    }
}

/// 任务状态总览卡，包含环形状态、完成进度、ETA 和通知说明。
private final class AIJobDetailStatusCard: UIView {
    private let ringView = AIJobCircularProgressView()
    private let statusLabel = UILabel()
    private let completedLabel = UILabel()
    private let progressView = UIProgressView(progressViewStyle: .default)
    private let percentLabel = UILabel()
    private let timeIcon = UIImageView(image: UIImage(systemName: "clock"))
    private let timeLabel = UILabel()
    private let notificationIcon = UIImageView(image: UIImage(systemName: "bell"))
    private let notificationLabel = UILabel()
    private let timeRow = UIStackView()
    private let notificationRow = UIStackView()

    override init(frame: CGRect) {
        super.init(frame: frame)
        AIJobDetailStyle.styleCard(self)
        accessibilityIdentifier = "aiRetouchJob.detail.statusCard"
        statusLabel.font = .systemFont(ofSize: 23, weight: .semibold)
        completedLabel.font = .systemFont(ofSize: 15)
        completedLabel.textColor = AIJobDetailStyle.textSecondary
        progressView.trackTintColor = UIColor(hex: 0xE5EAF2)
        progressView.layer.cornerRadius = 3
        progressView.clipsToBounds = true
        percentLabel.font = .systemFont(ofSize: 14, weight: .medium)
        percentLabel.textColor = AIJobDetailStyle.textSecondary
        percentLabel.textAlignment = .right
        [timeIcon, notificationIcon].forEach {
            $0.tintColor = AppColor.primary
            $0.contentMode = .scaleAspectFit
            $0.snp.makeConstraints { $0.size.equalTo(17) }
        }
        timeLabel.font = .systemFont(ofSize: 14)
        timeLabel.textColor = AIJobDetailStyle.textSecondary
        notificationLabel.font = .systemFont(ofSize: 14)
        notificationLabel.textColor = AIJobDetailStyle.textSecondary
        timeRow.axis = .horizontal
        timeRow.spacing = 8
        timeRow.alignment = .center
        timeRow.addArrangedSubview(timeIcon)
        timeRow.addArrangedSubview(timeLabel)
        notificationRow.axis = .horizontal
        notificationRow.spacing = 8
        notificationRow.alignment = .center
        notificationRow.addArrangedSubview(notificationIcon)
        notificationRow.addArrangedSubview(notificationLabel)

        let progressRow = UIStackView(arrangedSubviews: [progressView, percentLabel])
        progressRow.axis = .horizontal
        progressRow.spacing = 10
        progressRow.alignment = .center
        progressView.snp.makeConstraints { $0.height.equalTo(7) }
        percentLabel.snp.makeConstraints { $0.width.greaterThanOrEqualTo(38) }
        let rightStack = UIStackView(arrangedSubviews: [statusLabel, completedLabel, progressRow, timeRow, notificationRow])
        rightStack.axis = .vertical
        rightStack.spacing = 7
        addSubview(ringView)
        addSubview(rightStack)
        ringView.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(16)
            make.centerY.equalToSuperview()
            make.size.equalTo(92)
        }
        rightStack.snp.makeConstraints { make in
            make.top.bottom.equalToSuperview().inset(16)
            make.leading.equalTo(ringView.snp.trailing).offset(20)
            make.trailing.equalToSuperview().inset(18)
        }
    }

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

    func apply(_ detail: TravelAlbumAIJobDetail) {
        let color = detail.status.semanticColor
        statusLabel.text = detail.status.title
        statusLabel.textColor = color
        completedLabel.text = "已完成 \(detail.progress.completed) / \(detail.progress.total)"
        progressView.progressTintColor = color
        progressView.progress = Float(detail.progress.fraction)
        percentLabel.text = "\(Int((detail.progress.fraction * 100).rounded()))%"
        ringView.apply(progress: detail.progress.fraction, color: color, status: detail.status)
        if detail.status.isInProgress {
            timeLabel.text = detail.estimatedFinishAt.map {
                "预计 \(TravelAlbumAIJobDateFormatter.time($0)) 前完成"
            } ?? "完成时间暂无法预估"
            notificationLabel.text = "完成后将通过消息通知你"
            notificationRow.isHidden = false
        } else {
            timeLabel.text = "完成时间 \(TravelAlbumAIJobDateFormatter.display(detail.finishedAt))"
            notificationRow.isHidden = true
        }
        accessibilityLabel = [statusLabel.text, completedLabel.text, percentLabel.text, timeLabel.text, notificationLabel.text]
            .compactMap { $0 }.joined(separator: "，")
    }
}

/// 环形进度组件，使用图形、文字与颜色共同表达任务状态。
private final class AIJobCircularProgressView: UIView {
    private let trackLayer = CAShapeLayer()
    private let progressLayer = CAShapeLayer()
    private let iconView = UIImageView(image: UIImage(systemName: "sparkles"))

    override init(frame: CGRect) {
        super.init(frame: frame)
        layer.addSublayer(trackLayer)
        layer.addSublayer(progressLayer)
        [trackLayer, progressLayer].forEach {
            $0.fillColor = UIColor.clear.cgColor
            $0.lineWidth = 8
            $0.lineCap = .round
        }
        trackLayer.strokeColor = UIColor(hex: 0xE7F0FF).cgColor
        iconView.contentMode = .scaleAspectFit
        addSubview(iconView)
        iconView.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(37)
        }
    }

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

    override func layoutSubviews() {
        super.layoutSubviews()
        let center = CGPoint(x: bounds.midX, y: bounds.midY)
        let radius = max(0, min(bounds.width, bounds.height) / 2 - 6)
        let path = UIBezierPath(
            arcCenter: center,
            radius: radius,
            startAngle: -.pi / 2,
            endAngle: .pi * 1.5,
            clockwise: true
        ).cgPath
        trackLayer.path = path
        progressLayer.path = path
    }

    func apply(progress: Double, color: UIColor, status: TravelAlbumAIJobStatus) {
        progressLayer.strokeColor = color.cgColor
        progressLayer.strokeEnd = max(0.04, min(1, progress))
        iconView.tintColor = color
        iconView.image = UIImage(systemName: status.isInProgress ? "sparkles" : status == .succeeded ? "checkmark" : "exclamationmark")
    }
}

/// 相册与任务信息卡，匹配设计稿中的封面、账号与提交信息结构。
private final class AIJobDetailAlbumCard: UIView {
    private let coverView = UIImageView()
    private let albumLabel = UILabel()
    private let phoneLabel = UILabel()
    private let taskLabel = UILabel()
    private let submitLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        AIJobDetailStyle.styleCard(self)
        accessibilityIdentifier = "aiRetouchJob.detail.albumCard"
        coverView.contentMode = .scaleAspectFill
        coverView.clipsToBounds = true
        coverView.layer.cornerRadius = 12
        coverView.backgroundColor = AppColor.pageBackground
        coverView.tintColor = AppColor.textTertiary
        albumLabel.font = .systemFont(ofSize: 19, weight: .semibold)
        albumLabel.textColor = AIJobDetailStyle.textPrimary
        phoneLabel.font = .systemFont(ofSize: 14)
        phoneLabel.textColor = AIJobDetailStyle.textSecondary
        taskLabel.font = .systemFont(ofSize: 14)
        taskLabel.textColor = AIJobDetailStyle.textSecondary
        submitLabel.font = .systemFont(ofSize: 14)
        submitLabel.textColor = AIJobDetailStyle.textSecondary
        addSubview(coverView)
        addSubview(albumLabel)
        addSubview(phoneLabel)
        addSubview(taskLabel)
        addSubview(submitLabel)
        coverView.snp.makeConstraints { make in
            make.leading.top.bottom.equalToSuperview().inset(16)
            make.size.equalTo(84)
        }
        albumLabel.snp.makeConstraints { make in
            make.leading.equalTo(coverView.snp.trailing).offset(14)
            make.top.equalToSuperview().offset(19)
            make.trailing.equalToSuperview().inset(16)
        }
        phoneLabel.snp.makeConstraints { make in
            make.leading.equalTo(albumLabel)
            make.top.equalTo(albumLabel.snp.bottom).offset(7)
        }
        taskLabel.snp.makeConstraints { make in
            make.leading.equalTo(albumLabel)
            make.bottom.equalToSuperview().inset(19)
        }
        submitLabel.snp.makeConstraints { make in
            make.leading.greaterThanOrEqualTo(taskLabel.snp.trailing).offset(12)
            make.trailing.equalToSuperview().inset(16)
            make.centerY.equalTo(taskLabel)
        }
    }

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

    func apply(_ detail: TravelAlbumAIJobDetail) {
        coverView.kf.setImage(with: URL(string: detail.album.coverURL), placeholder: UIImage(systemName: "photo"))
        albumLabel.text = detail.album.name.isEmpty ? "未命名相册" : detail.album.name
        let phone = TravelAlbumDisplayFormatter.maskPhone(detail.album.userPhone)
        phoneLabel.text = phone.isEmpty ? "未提供手机号" : phone
        taskLabel.text = "任务 #\(detail.aiRetouchBatchId)"
        submitLabel.text = "\(TravelAlbumAIJobDateFormatter.display(detail.createdAt)) 提交"
        accessibilityLabel = [albumLabel.text, phoneLabel.text, taskLabel.text, submitLabel.text]
            .compactMap { $0 }.joined(separator: "，")
    }
}

/// 任务内容卡，以浅蓝标签展示各输出目标数量并补充额度结算。
private final class AIJobDetailContentCard: UIView {
    private let outputStack = UIStackView()
    private let quotaLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        AIJobDetailStyle.styleCard(self)
        accessibilityIdentifier = "aiRetouchJob.detail.contentCard"
        let titleLabel = UILabel()
        titleLabel.text = "任务内容"
        titleLabel.font = .systemFont(ofSize: 18, weight: .semibold)
        titleLabel.textColor = AIJobDetailStyle.textPrimary
        outputStack.axis = .horizontal
        outputStack.spacing = 10
        outputStack.distribution = .fillEqually
        quotaLabel.font = .systemFont(ofSize: 12)
        quotaLabel.textColor = AIJobDetailStyle.textSecondary
        quotaLabel.numberOfLines = 0
        let stack = UIStackView(arrangedSubviews: [titleLabel, outputStack, quotaLabel])
        stack.axis = .vertical
        stack.spacing = 14
        addSubview(stack)
        stack.snp.makeConstraints { $0.edges.equalToSuperview().inset(16) }
    }

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

    func apply(_ detail: TravelAlbumAIJobDetail) {
        outputStack.arrangedSubviews.forEach { $0.removeFromSuperview() }
        detail.outputs.forEach { outputStack.addArrangedSubview(makeChip($0)) }
        outputStack.isHidden = detail.outputs.isEmpty
        let quota = detail.quotaSettlement
        quotaLabel.text = "额度：预占 \(quota.reservedUnits) · 消耗 \(quota.consumedUnits) · 释放 \(quota.releasedUnits)"
        accessibilityLabel = ["任务内容", detail.outputs.map { "\($0.type.title) \($0.count)张" }.joined(separator: "，"), quotaLabel.text]
            .compactMap { $0 }.joined(separator: "，")
    }

    private func makeChip(_ output: TravelAlbumAIJobOutput) -> UIView {
        let container = UIView()
        container.backgroundColor = AppColor.primaryLight
        container.layer.cornerRadius = 9
        let iconView = UIImageView(image: UIImage(systemName: output.type.symbolName))
        iconView.tintColor = AppColor.primary
        iconView.contentMode = .scaleAspectFit
        let label = UILabel()
        label.text = "\(output.type.shortTitle) \(output.count) 张"
        label.font = .systemFont(ofSize: 14, weight: .medium)
        label.textColor = AIJobDetailStyle.textPrimary
        label.adjustsFontSizeToFitWidth = true
        label.minimumScaleFactor = 0.75
        container.addSubview(iconView)
        container.addSubview(label)
        iconView.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(10)
            make.centerY.equalToSuperview()
            make.size.equalTo(18)
        }
        label.snp.makeConstraints { make in
            make.leading.equalTo(iconView.snp.trailing).offset(6)
            make.trailing.equalToSuperview().inset(8)
            make.centerY.equalToSuperview()
        }
        container.snp.makeConstraints { $0.height.equalTo(44) }
        return container
    }
}

/// 处理明细卡，将逐照片、逐输出状态及失败原因放在同一卡片中展示。
private final class AIJobDetailProcessingCard: UIView {
    private let rowsStack = UIStackView()

    override init(frame: CGRect) {
        super.init(frame: frame)
        AIJobDetailStyle.styleCard(self)
        accessibilityIdentifier = "aiRetouchJob.detail.processingCard"
        let titleLabel = UILabel()
        titleLabel.text = "处理明细"
        titleLabel.font = .systemFont(ofSize: 18, weight: .semibold)
        titleLabel.textColor = AIJobDetailStyle.textPrimary
        rowsStack.axis = .vertical
        rowsStack.spacing = 0
        let stack = UIStackView(arrangedSubviews: [titleLabel, rowsStack])
        stack.axis = .vertical
        stack.spacing = 12
        addSubview(stack)
        stack.snp.makeConstraints { $0.edges.equalToSuperview().inset(16) }
    }

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

    func apply(
        _ targets: [TravelAlbumAIJobTarget],
        onViewResult: @escaping (TravelAlbumAIJobTarget) -> Void
    ) {
        rowsStack.arrangedSubviews.forEach { $0.removeFromSuperview() }
        if targets.isEmpty {
            let label = UILabel()
            label.text = "暂无处理明细"
            label.font = .systemFont(ofSize: 14)
            label.textColor = AIJobDetailStyle.textSecondary
            label.textAlignment = .center
            label.snp.makeConstraints { $0.height.equalTo(52) }
            rowsStack.addArrangedSubview(label)
            return
        }
        for (index, target) in targets.enumerated() {
            let row = AIJobDetailTargetRow()
            row.apply(target)
            row.onViewResult = { onViewResult(target) }
            rowsStack.addArrangedSubview(row)
            if index < targets.count - 1 {
                let separator = UIView()
                separator.backgroundColor = AIJobDetailStyle.border
                separator.snp.makeConstraints { $0.height.equalTo(1) }
                rowsStack.addArrangedSubview(separator)
            }
        }
    }
}

/// 单个输出明细行，内联展示结果操作或后端返回的失败原因。
private final class AIJobDetailTargetRow: UIView {
    private let thumbnailView = UIImageView()
    private let titleLabel = UILabel()
    private let templateLabel = UILabel()
    private let statusIconView = UIImageView()
    private let statusLabel = UILabel()
    private let resultButton = UIButton(type: .system)
    private let errorContainer = UIView()
    private let errorIconView = UIImageView(image: UIImage(systemName: "exclamationmark.circle.fill"))
    private let errorLabel = UILabel()
    var onViewResult: (() -> Void)?

    override init(frame: CGRect) {
        super.init(frame: frame)
        thumbnailView.contentMode = .scaleAspectFill
        thumbnailView.clipsToBounds = true
        thumbnailView.layer.cornerRadius = 10
        thumbnailView.backgroundColor = AppColor.pageBackground
        thumbnailView.tintColor = AppColor.textTertiary
        titleLabel.font = .systemFont(ofSize: 15, weight: .medium)
        titleLabel.textColor = AIJobDetailStyle.textPrimary
        titleLabel.lineBreakMode = .byTruncatingMiddle
        templateLabel.font = .systemFont(ofSize: 13)
        templateLabel.textColor = AIJobDetailStyle.textSecondary
        statusIconView.contentMode = .scaleAspectFit
        statusLabel.font = .systemFont(ofSize: 14, weight: .medium)
        resultButton.setTitle("查看结果", for: .normal)
        resultButton.titleLabel?.font = .systemFont(ofSize: 13, weight: .medium)
        resultButton.addTarget(self, action: #selector(viewResultTapped), for: .touchUpInside)
        errorContainer.backgroundColor = AppColor.dangerBackground
        errorContainer.layer.cornerRadius = 8
        errorIconView.tintColor = AppColor.danger
        errorLabel.font = .systemFont(ofSize: 13)
        errorLabel.textColor = AppColor.danger
        errorLabel.numberOfLines = 0

        let statusStack = UIStackView(arrangedSubviews: [statusIconView, statusLabel])
        statusStack.axis = .horizontal
        statusStack.spacing = 6
        statusStack.alignment = .center
        statusIconView.snp.makeConstraints { $0.size.equalTo(18) }
        addSubview(thumbnailView)
        addSubview(titleLabel)
        addSubview(templateLabel)
        addSubview(statusStack)
        addSubview(resultButton)
        addSubview(errorContainer)
        errorContainer.addSubview(errorIconView)
        errorContainer.addSubview(errorLabel)

        thumbnailView.snp.makeConstraints { make in
            make.leading.top.equalToSuperview().offset(4)
            make.size.equalTo(80)
        }
        titleLabel.snp.makeConstraints { make in
            make.leading.equalTo(thumbnailView.snp.trailing).offset(14)
            make.top.equalTo(thumbnailView).offset(18)
            make.trailing.lessThanOrEqualTo(statusStack.snp.leading).offset(-8)
        }
        templateLabel.snp.makeConstraints { make in
            make.leading.equalTo(titleLabel)
            make.top.equalTo(titleLabel.snp.bottom).offset(7)
            make.trailing.lessThanOrEqualTo(statusStack.snp.leading).offset(-8)
        }
        statusStack.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(4)
            make.centerY.equalTo(thumbnailView).offset(-7)
        }
        resultButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(4)
            make.top.equalTo(statusStack.snp.bottom).offset(4)
            make.height.equalTo(28)
        }
        errorContainer.snp.makeConstraints { make in
            make.top.equalTo(thumbnailView.snp.bottom).offset(10)
            make.leading.equalTo(titleLabel)
            make.trailing.equalToSuperview().inset(4)
            make.bottom.equalToSuperview().inset(12)
            make.height.greaterThanOrEqualTo(38)
        }
        errorIconView.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(10)
            make.top.equalToSuperview().offset(11)
            make.size.equalTo(16)
        }
        errorLabel.snp.makeConstraints { make in
            make.leading.equalTo(errorIconView.snp.trailing).offset(7)
            make.top.bottom.equalToSuperview().inset(9)
            make.trailing.equalToSuperview().inset(10)
        }
    }

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

    func apply(_ target: TravelAlbumAIJobTarget) {
        let thumbnail = target.sourceMaterial?.thumbnailURL ?? target.resultAsset?.thumbnailURL ?? ""
        thumbnailView.kf.setImage(with: URL(string: thumbnail), placeholder: UIImage(systemName: "photo"))
        titleLabel.text = target.outputType == .cover
            ? "相册封面"
            : (target.sourceMaterial?.fileName.isEmpty == false ? target.sourceMaterial?.fileName : "照片 \(target.sourceMaterial?.id ?? 0)")
        templateLabel.text = target.template?.name ?? target.outputType.title
        let color = target.status.semanticColor
        statusIconView.tintColor = color
        statusLabel.textColor = color
        statusIconView.image = UIImage(systemName: target.status.symbolName)
        switch target.status {
        case .succeeded:
            statusLabel.text = "\(target.outputType.shortTitle)完成"
        case .processing:
            statusLabel.text = "正在生成"
        case .queued:
            statusLabel.text = "等待处理"
        case .failed:
            statusLabel.text = "生成失败"
        default:
            statusLabel.text = target.status.title
        }
        let hasResult = target.status == .succeeded && target.resultAsset?.url.isEmpty == false
        resultButton.isHidden = !hasResult
        errorLabel.text = target.displayFailureMessage.map { "失败原因：\($0)" }
        let showsError = target.displayFailureMessage != nil
        errorContainer.isHidden = !showsError
        errorContainer.snp.remakeConstraints { make in
            make.top.equalTo(thumbnailView.snp.bottom).offset(showsError ? 10 : 0)
            make.leading.equalTo(titleLabel)
            make.trailing.equalToSuperview().inset(4)
            make.bottom.equalToSuperview().inset(12)
            if showsError {
                make.height.greaterThanOrEqualTo(38)
            } else {
                make.height.equalTo(0)
            }
        }
        accessibilityLabel = [titleLabel.text, templateLabel.text, statusLabel.text, errorLabel.text]
            .compactMap { $0 }.joined(separator: "，")
    }

    @objc private func viewResultTapped() { onViewResult?() }
}

/// 页面底部的查看相册主操作按钮。
private final class AIJobDetailAlbumButton: UIButton {
    override init(frame: CGRect) {
        super.init(frame: frame)
        var configuration = UIButton.Configuration.plain()
        configuration.title = "查看相册"
        configuration.image = UIImage(systemName: "photo")
        configuration.imagePadding = 10
        configuration.baseForegroundColor = AppColor.primary
        configuration.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { incoming in
            var outgoing = incoming
            outgoing.font = .systemFont(ofSize: 18, weight: .medium)
            return outgoing
        }
        self.configuration = configuration
        layer.cornerRadius = 10
        layer.borderWidth = 1.5
        layer.borderColor = AppColor.primary.cgColor
        backgroundColor = .white
        accessibilityIdentifier = "aiRetouchJob.detail.albumButton"
    }

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

/// 任务详情加载失败时的空态。
private final class AIJobDetailEmptyView: UIView {
    private let titleLabel = UILabel()
    private let messageLabel = UILabel()
    private let button = UIButton(type: .system)
    var onRetry: (() -> Void)?

    override init(frame: CGRect) {
        super.init(frame: frame)
        titleLabel.font = .systemFont(ofSize: 17, weight: .semibold)
        titleLabel.textAlignment = .center
        messageLabel.font = .systemFont(ofSize: 14)
        messageLabel.textColor = AppColor.textSecondary
        messageLabel.textAlignment = .center
        messageLabel.numberOfLines = 0
        button.setTitle("重新加载", for: .normal)
        button.addTarget(self, action: #selector(retry), for: .touchUpInside)
        let stack = UIStackView(arrangedSubviews: [titleLabel, messageLabel, button])
        stack.axis = .vertical
        stack.spacing = 12
        stack.alignment = .center
        addSubview(stack)
        stack.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.leading.trailing.equalToSuperview().inset(40)
        }
    }

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

    func apply(title: String, message: String) { titleLabel.text = title; messageLabel.text = message }
    @objc private func retry() { onRetry?() }
}

private extension TravelAlbumAIJobStatus {
    var semanticColor: UIColor {
        switch self {
        case .queued, .processing: AppColor.primary
        case .succeeded: AppColor.success
        case .partiallySucceeded: AppColor.warning
        case .failed: AppColor.danger
        case .canceled, .unknown: AppColor.textSecondary
        }
    }

    var symbolName: String {
        switch self {
        case .queued: "clock"
        case .processing: "arrow.triangle.2.circlepath"
        case .succeeded: "checkmark.circle.fill"
        case .partiallySucceeded: "exclamationmark.circle.fill"
        case .failed: "exclamationmark.circle"
        case .canceled, .unknown: "minus.circle"
        }
    }
}

private extension TravelAlbumAIJobOutputType {
    var shortTitle: String {
        switch self {
        case .refined: "精修"
        case .atmosphere: "氛围感"
        case .cover: "封面"
        case .unknown: "其他"
        }
    }

    var symbolName: String {
        switch self {
        case .refined: "wand.and.stars"
        case .atmosphere: "sun.max"
        case .cover: "bookmark"
        case .unknown: "sparkles"
        }
    }
}