//
//  PunchPointDetailViewController.swift
//  suixinkan
//

import Kingfisher
import Photos
import SnapKit
import UIKit

/// 打卡点详情页，对齐 Android `PunchPointDetailScreen`。
final class PunchPointDetailViewController: BaseViewController {
    private let viewModel: PunchPointDetailViewModel
    private let api: any PunchPointAPIProtocol

    private let mapView = PunchPointMapView()
    private let zoomStack = UIStackView()
    private let zoomInButton = PunchPointMapControlButton(symbol: "plus")
    private let zoomOutButton = PunchPointMapControlButton(symbol: "minus")
    private let locateButton = PunchPointMapControlButton(symbol: "location.fill")
    private let cardView = UIView()
    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let bottomBar = UIView()
    private let editButton = UIButton(type: .system)
    private let emptyContainer = UIStackView()
    private let emptyLabel = UILabel()
    private let retryButton = UIButton(type: .system)

    var onChanged: (() -> Void)?

    /// 初始化打卡点详情页。
    init(
        punchPointId: Int64,
        viewModel: PunchPointDetailViewModel? = nil,
        api: (any PunchPointAPIProtocol)? = nil
    ) {
        self.viewModel = viewModel ?? PunchPointDetailViewModel(punchPointId: punchPointId)
        self.api = api ?? NetworkServices.shared.punchPointAPI
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = "打卡点详情"
    }

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

        zoomStack.axis = .vertical
        zoomStack.spacing = 0
        zoomStack.addArrangedSubview(zoomInButton)
        zoomStack.addArrangedSubview(zoomOutButton)
        cardView.backgroundColor = .white
        cardView.layer.cornerRadius = 12
        cardView.clipsToBounds = true
        scrollView.showsVerticalScrollIndicator = false
        contentStack.axis = .vertical
        contentStack.spacing = 12
        bottomBar.backgroundColor = .white
        editButton.setTitle("去编辑", for: .normal)
        editButton.setTitleColor(.white, for: .normal)
        editButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        editButton.backgroundColor = AppColor.primary
        editButton.layer.cornerRadius = 12

        emptyContainer.axis = .vertical
        emptyContainer.alignment = .center
        emptyContainer.spacing = 12
        emptyLabel.text = "暂未获取到打卡点信息"
        emptyLabel.textColor = AppColor.textSecondary
        emptyLabel.font = .systemFont(ofSize: 15)
        retryButton.setTitle("重新加载", for: .normal)
        retryButton.setTitleColor(.white, for: .normal)
        retryButton.backgroundColor = AppColor.primary
        retryButton.layer.cornerRadius = 8
        emptyContainer.addArrangedSubview(emptyLabel)
        emptyContainer.addArrangedSubview(retryButton)
        emptyContainer.isHidden = true

        view.addSubview(mapView)
        view.addSubview(zoomStack)
        view.addSubview(locateButton)
        view.addSubview(cardView)
        cardView.addSubview(scrollView)
        scrollView.addSubview(contentStack)
        view.addSubview(bottomBar)
        bottomBar.addSubview(editButton)
        view.addSubview(emptyContainer)
    }

    override func setupConstraints() {
        mapView.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide)
            make.leading.trailing.equalToSuperview()
            make.height.equalToSuperview().multipliedBy(0.5)
        }
        zoomStack.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(16)
            make.bottom.equalTo(cardView.snp.top).offset(-16)
        }
        locateButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(16)
            make.bottom.equalTo(zoomStack.snp.top).offset(-12)
            make.size.equalTo(40)
        }
        zoomInButton.snp.makeConstraints { make in
            make.size.equalTo(40)
        }
        zoomOutButton.snp.makeConstraints { make in
            make.size.equalTo(40)
        }
        bottomBar.snp.makeConstraints { make in
            make.leading.trailing.bottom.equalToSuperview()
        }
        editButton.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(16)
            make.leading.trailing.equalToSuperview().inset(16)
            make.height.equalTo(48)
            make.bottom.equalTo(view.safeAreaLayoutGuide).offset(-20)
        }
        cardView.snp.makeConstraints { make in
            make.leading.trailing.equalToSuperview().inset(16)
            make.bottom.equalTo(bottomBar.snp.top)
            make.height.lessThanOrEqualToSuperview().multipliedBy(0.45)
            make.top.greaterThanOrEqualTo(mapView.snp.top).offset(60)
        }
        scrollView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        contentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 16, left: 12, bottom: 12, right: 12))
            make.width.equalTo(scrollView.snp.width).offset(-24)
        }
        emptyContainer.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
        retryButton.snp.makeConstraints { make in
            make.width.equalTo(118)
            make.height.equalTo(40)
        }
    }

    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) }
        }
        zoomInButton.addTarget(self, action: #selector(zoomInTapped), for: .touchUpInside)
        zoomOutButton.addTarget(self, action: #selector(zoomOutTapped), for: .touchUpInside)
        locateButton.addTarget(self, action: #selector(locateTapped), for: .touchUpInside)
        retryButton.addTarget(self, action: #selector(retryTapped), for: .touchUpInside)
        editButton.addTarget(self, action: #selector(editTapped), for: .touchUpInside)
    }

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

    @MainActor
    private func applyViewModel() {
        viewModel.isLoading && viewModel.detail == nil ? showLoading() : hideLoading()
        emptyContainer.isHidden = viewModel.detail != nil || viewModel.isLoading
        guard let detail = viewModel.detail else {
            cardView.isHidden = true
            bottomBar.isHidden = true
            return
        }
        cardView.isHidden = false
        bottomBar.isHidden = false
        if let region = detail.region {
            let coordinate = CLLocationCoordinate2D(latitude: region.lat, longitude: region.lot)
            mapView.updateMarker(coordinate: coordinate)
            mapView.setCenter(coordinate, zoomLevel: 16)
        }
        rebuildContent(detail)
    }

    private func rebuildContent(_ detail: PunchPointDetail) {
        contentStack.arrangedSubviews.forEach { $0.removeFromSuperview() }
        contentStack.addArrangedSubview(PunchPointReadOnlyField(title: "*打卡点名称", value: detail.name))
        let coordinateText = detail.region.map { "\($0.lat),\($0.lot)" } ?? "--"
        contentStack.addArrangedSubview(PunchPointReadOnlyField(title: "*打卡点坐标", value: coordinateText))
        contentStack.addArrangedSubview(PunchPointReadOnlyField(title: "*打卡点地址", value: detail.displayAddress.nonEmptyTrimmed ?? "--"))
        if let description = detail.description?.nonEmptyTrimmed {
            contentStack.addArrangedSubview(PunchPointReadOnlyField(title: "打卡点描述", value: description, multiline: true))
        }
        contentStack.addArrangedSubview(makeImageSection(detail.guideImages))
        contentStack.addArrangedSubview(PunchPointRowField(title: "负责人", value: detail.creator?.nonEmptyTrimmed ?? "--"))
        contentStack.addArrangedSubview(PunchPointDivider())
        contentStack.addArrangedSubview(PunchPointRowField(title: "负责人手机号", value: PunchPointDisplayFormatter.maskedPhone(detail.creatorPhone)))
        contentStack.addArrangedSubview(PunchPointDivider())
        contentStack.addArrangedSubview(makeStatusRow(detail))
        contentStack.addArrangedSubview(PunchPointDivider())
        contentStack.addArrangedSubview(PunchPointRowField(title: "审核人", value: detail.auditor?.nonEmptyTrimmed ?? "--"))
        contentStack.addArrangedSubview(PunchPointDivider())
        contentStack.addArrangedSubview(PunchPointRowField(title: "审核时间", value: detail.auditTime?.nonEmptyTrimmed ?? "--"))
        contentStack.addArrangedSubview(PunchPointDivider())
        contentStack.addArrangedSubview(PunchPointRowField(title: "审核备注", value: detail.auditRemark?.nonEmptyTrimmed ?? "--"))
        contentStack.addArrangedSubview(makeQRSection(detail.mpQrcode))
    }

    private func makeImageSection(_ urls: [String]) -> UIView {
        let section = UIStackView()
        section.axis = .vertical
        section.spacing = 8
        let title = UILabel()
        title.attributedText = requiredTitle("*上传图片 (最多9张)")
        section.addArrangedSubview(title)
        guard !urls.isEmpty else {
            let empty = UILabel()
            empty.text = "暂无图片"
            empty.font = .systemFont(ofSize: 12)
            empty.textColor = AppColor.textSecondary
            section.addArrangedSubview(empty)
            return section
        }
        let scroll = UIScrollView()
        scroll.showsHorizontalScrollIndicator = false
        let row = UIStackView()
        row.axis = .horizontal
        row.spacing = 12
        scroll.addSubview(row)
        row.snp.makeConstraints { make in
            make.edges.equalToSuperview()
            make.height.equalTo(90)
        }
        urls.enumerated().forEach { index, urlText in
            let imageView = UIImageView()
            imageView.contentMode = .scaleAspectFill
            imageView.clipsToBounds = true
            imageView.layer.cornerRadius = 10
            imageView.isUserInteractionEnabled = true
            imageView.tag = index
            if let url = URL(string: urlText) {
                imageView.kf.setImage(with: url)
            }
            imageView.snp.makeConstraints { make in
                make.width.equalTo(120)
            }
            imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(imageTapped(_:))))
            row.addArrangedSubview(imageView)
        }
        scroll.snp.makeConstraints { make in
            make.height.equalTo(90)
        }
        section.addArrangedSubview(scroll)
        return section
    }

    private func makeStatusRow(_ detail: PunchPointDetail) -> UIView {
        let row = UIStackView()
        row.axis = .horizontal
        row.alignment = .center
        row.distribution = .equalSpacing
        let label = UILabel()
        label.text = "审核状态"
        label.font = .systemFont(ofSize: 14)
        label.textColor = UIColor(hex: 0x2E3746)
        let chip = PunchPointStatusChip()
        chip.apply(text: detail.statusLabel.nonEmptyTrimmed ?? "--", status: detail.status)
        row.addArrangedSubview(label)
        row.addArrangedSubview(chip)
        row.isLayoutMarginsRelativeArrangement = true
        row.layoutMargins = UIEdgeInsets(top: 12, left: 0, bottom: 12, right: 0)
        return row
    }

    private func makeQRSection(_ qrCode: String?) -> UIView {
        let section = UIStackView()
        section.axis = .vertical
        section.alignment = .center
        section.spacing = 12
        let title = UILabel()
        title.text = "打卡点二维码"
        title.font = .systemFont(ofSize: 14)
        title.textColor = UIColor(hex: 0x2E3746)
        title.textAlignment = .left
        section.addArrangedSubview(title)
        title.snp.makeConstraints { make in
            make.width.equalTo(section.snp.width)
        }
        guard let qrCode = qrCode?.nonEmptyTrimmed else {
            let empty = UILabel()
            empty.text = "暂无二维码"
            empty.font = .systemFont(ofSize: 12)
            empty.textColor = AppColor.textSecondary
            section.addArrangedSubview(empty)
            return section
        }
        let imageView = UIImageView()
        imageView.contentMode = .scaleAspectFill
        imageView.clipsToBounds = true
        imageView.layer.cornerRadius = 16
        if let url = URL(string: qrCode) {
            imageView.kf.setImage(with: url)
        }
        imageView.snp.makeConstraints { make in
            make.size.equalTo(180)
        }
        let download = UIButton(type: .system)
        download.setTitle("下载二维码", for: .normal)
        download.setTitleColor(AppColor.primary, for: .normal)
        download.titleLabel?.font = .systemFont(ofSize: 14)
        download.backgroundColor = AppColor.primaryLight
        download.layer.cornerRadius = 8
        download.snp.makeConstraints { make in
            make.height.equalTo(38)
            make.width.equalTo(128)
        }
        download.addAction(UIAction { [weak self] _ in
            self?.downloadQRCode(qrCode)
        }, for: .touchUpInside)
        section.addArrangedSubview(imageView)
        section.addArrangedSubview(download)
        return section
    }

    private func downloadQRCode(_ urlText: String) {
        guard let url = URL(string: urlText) else {
            showToast("二维码地址无效")
            return
        }
        Task {
            do {
                let (data, _) = try await URLSession.shared.data(from: url)
                guard let image = UIImage(data: data) else { throw APIError.decodeFailed("二维码图片无效") }
                try await PHPhotoLibrary.shared().performChanges {
                    PHAssetChangeRequest.creationRequestForAsset(from: image)
                }
                await MainActor.run { self.showToast("已保存到相册") }
            } catch {
                await MainActor.run { self.showToast(error.localizedDescription.isEmpty ? "保存失败" : error.localizedDescription) }
            }
        }
    }

    private func requiredTitle(_ text: String) -> NSAttributedString {
        let mutable = NSMutableAttributedString(string: text, attributes: [
            .font: UIFont.systemFont(ofSize: 14, weight: .medium),
            .foregroundColor: UIColor(hex: 0x2E3746),
        ])
        if text.hasPrefix("*") {
            mutable.addAttribute(.foregroundColor, value: AppColor.danger, range: NSRange(location: 0, length: 1))
        }
        return mutable
    }

    @objc private func imageTapped(_ gesture: UITapGestureRecognizer) {
        guard let imageView = gesture.view, let urls = viewModel.detail?.guideImages else { return }
        presentImagePreview(imageURLs: urls, startIndex: imageView.tag)
    }

    @objc private func zoomInTapped() {
        mapView.zoomIn()
    }

    @objc private func zoomOutTapped() {
        mapView.zoomOut()
    }

    @objc private func locateTapped() {
        mapView.centerOnUserLocation()
    }

    @objc private func retryTapped() {
        Task { await viewModel.load(api: api) }
    }

    @objc private func editTapped() {
        guard let detail = viewModel.detail else { return }
        let controller = PunchPointFormViewController(mode: .edit(id: detail.id), initialDetail: detail)
        controller.onSubmitSuccess = { [weak self] in
            guard let self else { return }
            self.onChanged?()
            Task { await self.viewModel.load(api: self.api) }
        }
        navigationController?.pushViewController(controller, animated: true)
    }
}

/// 高德地图容器，供打卡点详情与表单复用。
/// 打卡点地图视图，封装高德地图 marker、缩放、定位与点击选点行为。
final class PunchPointMapView: UIView, MAMapViewDelegate {
    var onMapTap: ((CLLocationCoordinate2D) -> Void)?

    private let mapView: MAMapView
    private var markerAnnotation: MAPointAnnotation?

    override init(frame: CGRect) {
        _ = AMapBootstrap.configureIfNeeded()
        mapView = MAMapView(frame: .zero)
        super.init(frame: frame)
        mapView.delegate = self
        mapView.showsUserLocation = true
        mapView.showsCompass = false
        mapView.showsScale = false
        mapView.zoomLevel = 15
        addSubview(mapView)
        mapView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }

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

    /// 更新打卡点标记。
    func updateMarker(coordinate: CLLocationCoordinate2D?) {
        if let markerAnnotation {
            mapView.removeAnnotation(markerAnnotation)
            self.markerAnnotation = nil
        }
        guard let coordinate, CLLocationCoordinate2DIsValid(coordinate) else { return }
        let annotation = MAPointAnnotation()
        annotation.coordinate = coordinate
        annotation.title = "打卡点位置"
        markerAnnotation = annotation
        mapView.addAnnotation(annotation)
    }

    /// 设置地图中心点。
    func setCenter(_ coordinate: CLLocationCoordinate2D, zoomLevel: Double = 15, animated: Bool = true) {
        mapView.setCenter(coordinate, animated: animated)
        mapView.setZoomLevel(zoomLevel, animated: animated)
    }

    /// 放大地图。
    func zoomIn() {
        mapView.setZoomLevel(mapView.zoomLevel + 1, animated: true)
    }

    /// 缩小地图。
    func zoomOut() {
        mapView.setZoomLevel(mapView.zoomLevel - 1, animated: true)
    }

    /// 居中到用户当前位置。
    func centerOnUserLocation() {
        guard let coordinate = mapView.userLocation.location?.coordinate,
              CLLocationCoordinate2DIsValid(coordinate),
              coordinate.latitude != 0 || coordinate.longitude != 0 else { return }
        setCenter(coordinate)
    }

    func mapView(_ mapView: MAMapView!, didSingleTappedAt coordinate: CLLocationCoordinate2D) {
        onMapTap?(coordinate)
    }
}

/// 打卡点地图控制按钮。
/// 地图悬浮控制按钮。
final class PunchPointMapControlButton: UIButton {
    init(symbol: String) {
        super.init(frame: .zero)
        setImage(UIImage(systemName: symbol), for: .normal)
        tintColor = AppColor.textPrimary
        backgroundColor = .white
        layer.cornerRadius = 12
        clipsToBounds = true
    }

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

/// 打卡点只读字段。
/// 详情页只读字段块。
final class PunchPointReadOnlyField: UIView {
    init(title: String, value: String, multiline: Bool = false) {
        super.init(frame: .zero)
        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 8
        let titleLabel = UILabel()
        titleLabel.attributedText = Self.requiredTitle(title)
        let valueLabel = UILabel()
        valueLabel.text = value.nonEmptyTrimmed ?? "--"
        valueLabel.font = .systemFont(ofSize: 14, weight: .medium)
        valueLabel.textColor = AppColor.textPrimary
        valueLabel.numberOfLines = multiline ? 0 : 2
        stack.addArrangedSubview(titleLabel)
        stack.addArrangedSubview(valueLabel)
        addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }

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

    private static func requiredTitle(_ text: String) -> NSAttributedString {
        let mutable = NSMutableAttributedString(string: text, attributes: [
            .font: UIFont.systemFont(ofSize: 14, weight: .medium),
            .foregroundColor: UIColor(hex: 0x2E3746),
        ])
        if text.hasPrefix("*") {
            mutable.addAttribute(.foregroundColor, value: AppColor.danger, range: NSRange(location: 0, length: 1))
        }
        return mutable
    }
}

/// 打卡点左右字段。
/// 详情页横向键值字段。
final class PunchPointRowField: UIView {
    init(title: String, value: String) {
        super.init(frame: .zero)
        let titleLabel = UILabel()
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 14)
        titleLabel.textColor = UIColor(hex: 0x2E3746)
        let valueLabel = UILabel()
        valueLabel.text = value.nonEmptyTrimmed ?? "--"
        valueLabel.font = .systemFont(ofSize: 14, weight: .medium)
        valueLabel.textColor = .black
        valueLabel.textAlignment = .right
        valueLabel.numberOfLines = 2
        addSubview(titleLabel)
        addSubview(valueLabel)
        titleLabel.snp.makeConstraints { make in
            make.leading.top.bottom.equalToSuperview().inset(UIEdgeInsets(top: 12, left: 0, bottom: 12, right: 0))
        }
        valueLabel.snp.makeConstraints { make in
            make.leading.greaterThanOrEqualTo(titleLabel.snp.trailing).offset(12)
            make.trailing.centerY.equalToSuperview()
        }
    }

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

/// 打卡点详情分割线。
/// 详情卡片内分割线。
final class PunchPointDivider: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = UIColor(hex: 0xF0F0F0)
        snp.makeConstraints { make in
            make.height.equalTo(1)
        }
    }

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

private extension String {
    var nonEmptyTrimmed: String? {
        let text = trimmingCharacters(in: .whitespacesAndNewlines)
        return text.isEmpty ? nil : text
    }
}