//
//  PunchPointViewControllers.swift
//  suixinkan
//
//  Created by Codex on 2026/6/26.
//

import CoreLocation
import SnapKit
import UIKit

private extension PunchPointItem {
    var displayAddress: String {
        region?.address ?? scenicSpotStr
    }
}

/// 打卡点列表页。
final class PunchPointListViewController: ModuleTableViewController {
    private let viewModel = PunchPointListViewModel()

    /// 视图加载完成后的 UI 初始化与数据绑定。
    override func viewDidLoad() {
        title = "打卡点"
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "新建",
            style: .plain,
            target: self,
            action: #selector(createPunchPoint)
        )
        super.viewDidLoad()
        wireViewModel(viewModel) { }
    }

    /// table行Count相关逻辑。
    override func tableRowCount() -> Int { viewModel.items.count }

    /// 配置Cell展示内容。
    override func configureCell(_ cell: TitleSubtitleTableViewCell, at indexPath: IndexPath) {
        let item = viewModel.items[indexPath.row]
        cell.configure(title: item.name, subtitle: item.displayAddress, detail: item.statusLabel)
    }

    /// didSelectTableRow 回调处理。
    override func didSelectTableRow(at indexPath: IndexPath) {
        let item = viewModel.items[indexPath.row]
        navigationController?.pushViewController(
            PunchPointDetailViewController(punchPointId: item.id, summary: item),
            animated: true
        )
    }

    /// 刷新Content。
    override func reloadContent() async {
        await viewModel.reload(scenicId: services.currentScenicId, api: services.punchPointAPI)
    }

    /// 创建打卡Point。
    @objc private func createPunchPoint() {
        navigationController?.pushViewController(PunchPointEditorViewController(punchPointId: nil), animated: true)
    }
}

extension PunchPointListViewModel: ViewModelBindable {}

/// 打卡点详情页。
final class PunchPointDetailViewController: ModuleTableViewController {
    private let punchPointId: Int
    private let summary: PunchPointItem?
    private let viewModel = PunchPointListViewModel()

    /// 初始化实例。
    init(punchPointId: Int, summary: PunchPointItem?) {
        self.punchPointId = punchPointId
        self.summary = summary
        super.init(nibName: nil, bundle: nil)
    }

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

    /// 视图加载完成后的 UI 初始化与数据绑定。
    override func viewDidLoad() {
        title = summary?.name ?? "打卡点详情"
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "二维码",
            style: .plain,
            target: self,
            action: #selector(showQR)
        )
        super.viewDidLoad()
        viewModel.onChange = { [weak self] in
            self?.title = self?.viewModel.selectedDetail?.name ?? self?.summary?.name
            self?.reloadTable()
        }
    }

    /// table行Count相关逻辑。
    override func tableRowCount() -> Int {
        guard viewModel.selectedDetail != nil || summary != nil else { return 0 }
        return 4
    }

    /// 配置Cell展示内容。
    override func configureCell(_ cell: TitleSubtitleTableViewCell, at indexPath: IndexPath) {
        let detail = viewModel.selectedDetail ?? summary
        guard let detail else { return }
        switch indexPath.row {
        case 0: cell.configure(title: "名称", subtitle: detail.name)
        case 1: cell.configure(title: "地址", subtitle: detail.displayAddress)
        case 2: cell.configure(title: "状态", subtitle: detail.statusLabel)
        default: cell.configure(title: "创建时间", subtitle: detail.createdAt)
        }
    }

    /// 刷新Content。
    override func reloadContent() async {
        await viewModel.loadDetail(id: punchPointId, api: services.punchPointAPI)
    }

    /// 展示QR。
    @objc private func showQR() {
        guard let detail = viewModel.selectedDetail ?? summary else { return }
        navigationController?.pushViewController(
            PunchPointQRViewController(title: detail.name, qrURL: detail.mpQrcode),
            animated: true
        )
    }
}

/// 打卡点编辑页。
final class PunchPointEditorViewController: UIViewController {
    private let viewModel = PunchPointEditorViewModel()
    private let punchPointId: Int?
    private let nameField = UITextField()
    private let addressField = UITextField()
    private let latitudeField = UITextField()
    private let longitudeField = UITextField()
    private let mapPicker = PunchPointMapPickerView()
    private let locationProvider = ForegroundLocationProvider()

    private var services: AppServices { AppServices.shared }

    init(punchPointId: Int?) {
        self.punchPointId = punchPointId
        super.init(nibName: nil, bundle: nil)
    }

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

    override func viewDidLoad() {
        super.viewDidLoad()
        title = punchPointId == nil ? "新建打卡点" : "编辑打卡点"
        view.backgroundColor = UIColor(hex: 0xF5F7FA)
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "保存",
            style: .done,
            target: self,
            action: #selector(save)
        )

        configureFields()
        layoutForm()
        wireViewModel()

        mapPicker.onLocationPicked = { [weak self] lat, lng, address in
            self?.viewModel.applyLocation(latitude: lat, longitude: lng, address: address)
            self?.syncFieldsFromViewModel()
        }

        Task {
            guard let punchPointId else { return }
            if let detail = try? await services.punchPointAPI.punchPointInfo(id: punchPointId) {
                viewModel.apply(detail)
                syncFieldsFromViewModel()
            }
        }
    }

    private func configureFields() {
        [nameField, addressField, latitudeField, longitudeField].forEach {
            $0.borderStyle = .roundedRect
            $0.font = .systemFont(ofSize: AppMetrics.FontSize.body)
        }
        nameField.placeholder = "打卡点名称"
        addressField.placeholder = "地址"
        latitudeField.placeholder = "纬度"
        longitudeField.placeholder = "经度"
        latitudeField.keyboardType = .decimalPad
        longitudeField.keyboardType = .decimalPad
    }

    private func layoutForm() {
        let locateButton = UIButton(type: .system)
        locateButton.setTitle("使用当前位置", for: .normal)
        locateButton.addTarget(self, action: #selector(useCurrentLocation), for: .touchUpInside)

        let stack = UIStackView(arrangedSubviews: [
            nameField,
            mapPicker,
            addressField,
            latitudeField,
            longitudeField,
            locateButton
        ])
        stack.axis = .vertical
        stack.spacing = AppMetrics.Spacing.small

        view.addSubview(stack)
        nameField.snp.makeConstraints { make in make.height.equalTo(44) }
        mapPicker.snp.makeConstraints { make in make.height.equalTo(220) }
        addressField.snp.makeConstraints { make in make.height.equalTo(44) }
        latitudeField.snp.makeConstraints { make in make.height.equalTo(44) }
        longitudeField.snp.makeConstraints { make in make.height.equalTo(44) }
        locateButton.snp.makeConstraints { make in make.height.equalTo(44) }

        stack.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide).offset(AppMetrics.Spacing.medium)
            make.leading.trailing.equalToSuperview().inset(AppMetrics.Spacing.pageHorizontal)
        }
    }

    private func wireViewModel() {
        viewModel.onChange = { [weak self] in
            self?.syncFieldsFromViewModel()
        }
    }

    private func syncFieldsFromViewModel() {
        if nameField.text?.isEmpty != false { nameField.text = viewModel.name }
        addressField.text = viewModel.address
        latitudeField.text = viewModel.latitudeText
        longitudeField.text = viewModel.longitudeText
        if let lat = Double(viewModel.latitudeText), let lng = Double(viewModel.longitudeText) {
            mapPicker.setCoordinate(latitude: lat, longitude: lng)
        }
    }

    @objc private func useCurrentLocation() {
        Task {
            do {
                let result = try await locationProvider.requestCurrentLocation()
                viewModel.applyLocation(
                    latitude: result.latitude,
                    longitude: result.longitude,
                    address: result.address
                )
                syncFieldsFromViewModel()
            } catch {
                services.toastCenter.show("定位失败：\(error.localizedDescription)")
            }
        }
    }

    @objc private func save() {
        viewModel.name = nameField.text ?? ""
        viewModel.address = addressField.text ?? ""
        viewModel.latitudeText = latitudeField.text ?? ""
        viewModel.longitudeText = longitudeField.text ?? ""
        Task {
            let success = await viewModel.submit(
                scenicId: services.currentScenicId,
                api: services.punchPointAPI,
                uploadService: services.ossUploadService
            )
            if success {
                services.toastCenter.show("保存成功")
                navigationController?.popViewController(animated: true)
            } else if let message = viewModel.errorMessage {
                services.toastCenter.show(message)
            }
        }
    }
}

extension PunchPointEditorViewModel: ViewModelBindable {}

/// 打卡点二维码页。
final class PunchPointQRViewController: UIViewController {
    private let pageTitle: String
    private let qrURL: String

    /// 初始化实例。
    init(title: String, qrURL: String) {
        pageTitle = title
        self.qrURL = qrURL
        super.init(nibName: nil, bundle: nil)
    }

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

    /// 视图加载完成后的 UI 初始化与数据绑定。
    override func viewDidLoad() {
        super.viewDidLoad()
        title = pageTitle
        view.backgroundColor = UIColor(hex: 0xF5F7FA)

        let urlLabel = UILabel()
        urlLabel.text = qrURL
        urlLabel.numberOfLines = 0
        urlLabel.textAlignment = .center
        urlLabel.textColor = AppDesign.textSecondary
        view.addSubview(urlLabel)
        urlLabel.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.leading.trailing.equalToSuperview().inset(24)
        }
    }
}