//
//  WiredCameraTransferViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 有线相机传输页，仅同步 Android 断开空态 UI，不接入 OTG 或上传业务。
final class WiredCameraTransferViewController: BaseViewController {
    private let viewModel: WiredCameraTransferViewModel

    private let headerView = UIView()
    private let backButton = UIButton(type: .system)
    private let titleLabel = UILabel()
    private let phoneLabel = UILabel()
    private let statusCard = UIView()
    private let storagePanel = UIView()
    private let storageTitleLabel = UILabel()
    private let storageValueLabel = UILabel()
    private let statusLabel = UILabel()
    private let refreshButton = UIButton(type: .system)
    private let helpLabel = UILabel()
    private let chipsStack = UIStackView()
    private let statsCard = UIStackView()
    private let emptyLabel = UILabel()
    private let bottomBar = UIView()
    private let batchButton = UIButton(type: .system)
    private let specifyButton = UIButton(type: .system)

    init(viewModel: WiredCameraTransferViewModel) {
        self.viewModel = viewModel
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        navigationController?.setNavigationBarHidden(true, animated: false)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        navigationController?.setNavigationBarHidden(false, animated: animated)
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackground
        headerView.backgroundColor = AppColor.primary
        backButton.setImage(UIImage(systemName: "chevron.left"), for: .normal)
        backButton.tintColor = .white
        titleLabel.text = viewModel.albumTitle
        titleLabel.font = .systemFont(ofSize: 20, weight: .bold)
        titleLabel.textColor = .white
        phoneLabel.text = viewModel.headerPhone
        phoneLabel.font = .systemFont(ofSize: 13)
        phoneLabel.textColor = UIColor.white.withAlphaComponent(0.92)

        statusCard.backgroundColor = .white
        statusCard.layer.cornerRadius = 12
        statusCard.layer.shadowColor = UIColor.black.withAlphaComponent(0.10).cgColor
        statusCard.layer.shadowOpacity = 1
        statusCard.layer.shadowRadius = 8
        statusCard.layer.shadowOffset = CGSize(width: 0, height: 3)

        storagePanel.layer.cornerRadius = 12
        storagePanel.layer.borderColor = AppColor.border.cgColor
        storagePanel.layer.borderWidth = 3
        storageTitleLabel.text = viewModel.deviceModelName
        storageTitleLabel.font = .systemFont(ofSize: 11, weight: .medium)
        storageTitleLabel.textColor = AppColor.textPrimary
        storageTitleLabel.textAlignment = .center
        storageValueLabel.text = viewModel.availableStorageText
        storageValueLabel.font = .systemFont(ofSize: 10)
        storageValueLabel.textColor = AppColor.primary
        storageValueLabel.textAlignment = .center

        statusLabel.text = viewModel.cameraStatusText
        statusLabel.font = .systemFont(ofSize: 11, weight: .medium)
        statusLabel.textColor = AppColor.danger
        statusLabel.backgroundColor = AppColor.danger.withAlphaComponent(0.10)
        statusLabel.layer.cornerRadius = 4
        statusLabel.clipsToBounds = true
        statusLabel.textAlignment = .center
        refreshButton.setTitle(viewModel.actionButtonText, for: .normal)
        refreshButton.setTitleColor(.white, for: .normal)
        refreshButton.titleLabel?.font = .systemFont(ofSize: 12)
        refreshButton.backgroundColor = AppColor.danger
        refreshButton.layer.cornerRadius = 8
        helpLabel.attributedText = helpText()
        helpLabel.font = .systemFont(ofSize: 10)
        helpLabel.numberOfLines = 2

        chipsStack.axis = .horizontal
        chipsStack.spacing = 6
        [viewModel.retouchOption, viewModel.photoFormatOption, viewModel.transferModeOption].forEach {
            chipsStack.addArrangedSubview(makeChip($0))
        }

        statsCard.axis = .horizontal
        statsCard.distribution = .fillEqually
        ["全部", "已上传", "失败"].enumerated().forEach { index, title in
            statsCard.addArrangedSubview(makeStat(title: title, count: viewModel.tabCounts[index], selected: index == 0, danger: index == 2))
        }

        emptyLabel.text = "暂无照片"
        emptyLabel.font = .systemFont(ofSize: 14)
        emptyLabel.textColor = AppColor.textTertiary
        emptyLabel.textAlignment = .center

        bottomBar.backgroundColor = .white
        configureBottomButton(batchButton, title: "批量上传", filled: true)
        configureBottomButton(specifyButton, title: "指定上传", filled: false)

        view.addSubview(headerView)
        headerView.addSubview(backButton)
        headerView.addSubview(titleLabel)
        headerView.addSubview(phoneLabel)
        view.addSubview(statusCard)
        statusCard.addSubview(storagePanel)
        storagePanel.addSubview(storageTitleLabel)
        storagePanel.addSubview(storageValueLabel)
        statusCard.addSubview(statusLabel)
        statusCard.addSubview(refreshButton)
        statusCard.addSubview(helpLabel)
        statusCard.addSubview(chipsStack)
        statusCard.addSubview(statsCard)
        view.addSubview(emptyLabel)
        view.addSubview(bottomBar)
        bottomBar.addSubview(batchButton)
        bottomBar.addSubview(specifyButton)
    }

    override func setupConstraints() {
        headerView.snp.makeConstraints { make in
            make.top.leading.trailing.equalToSuperview()
            make.height.equalTo(118)
        }
        backButton.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(8)
            make.bottom.equalToSuperview().offset(-28)
            make.size.equalTo(44)
        }
        titleLabel.snp.makeConstraints { make in
            make.leading.equalTo(backButton.snp.trailing).offset(4)
            make.trailing.equalToSuperview().offset(-16)
            make.top.equalTo(backButton).offset(4)
        }
        phoneLabel.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(2)
            make.leading.trailing.equalTo(titleLabel)
        }
        statusCard.snp.makeConstraints { make in
            make.top.equalTo(headerView.snp.bottom).offset(-10)
            make.leading.trailing.equalToSuperview().inset(16)
        }
        storagePanel.snp.makeConstraints { make in
            make.top.leading.equalToSuperview().offset(14)
            make.width.greaterThanOrEqualTo(76)
            make.height.equalTo(76)
        }
        storageTitleLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(10)
            make.leading.trailing.equalToSuperview().inset(8)
        }
        storageValueLabel.snp.makeConstraints { make in
            make.top.equalTo(storageTitleLabel.snp.bottom).offset(6)
            make.leading.trailing.equalTo(storageTitleLabel)
        }
        statusLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(16)
            make.leading.equalTo(storagePanel.snp.trailing).offset(10)
            make.height.equalTo(22)
            make.width.greaterThanOrEqualTo(84)
        }
        refreshButton.snp.makeConstraints { make in
            make.centerY.equalTo(statusLabel)
            make.trailing.equalToSuperview().offset(-14)
            make.height.equalTo(34)
            make.width.greaterThanOrEqualTo(72)
        }
        helpLabel.snp.makeConstraints { make in
            make.top.equalTo(statusLabel.snp.bottom).offset(4)
            make.leading.equalTo(statusLabel)
            make.trailing.equalTo(refreshButton)
        }
        chipsStack.snp.makeConstraints { make in
            make.top.equalTo(storagePanel.snp.bottom).offset(12)
            make.leading.trailing.equalToSuperview().inset(14)
            make.height.equalTo(34)
        }
        statsCard.snp.makeConstraints { make in
            make.top.equalTo(chipsStack.snp.bottom).offset(14)
            make.leading.trailing.bottom.equalToSuperview()
            make.height.equalTo(68)
        }
        bottomBar.snp.makeConstraints { make in
            make.leading.trailing.bottom.equalToSuperview()
        }
        batchButton.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(12)
            make.leading.equalToSuperview().offset(16)
            make.height.equalTo(44)
            make.bottom.equalTo(view.safeAreaLayoutGuide).offset(-12)
        }
        specifyButton.snp.makeConstraints { make in
            make.top.height.width.equalTo(batchButton)
            make.leading.equalTo(batchButton.snp.trailing).offset(12)
            make.trailing.equalToSuperview().offset(-16)
        }
        emptyLabel.snp.makeConstraints { make in
            make.top.equalTo(statusCard.snp.bottom)
            make.leading.trailing.equalToSuperview()
            make.bottom.equalTo(bottomBar.snp.top)
        }
    }

    override func bindActions() {
        viewModel.onShowMessage = { [weak self] message in
            Task { @MainActor in self?.showToast(message) }
        }
        backButton.addTarget(self, action: #selector(backTapped), for: .touchUpInside)
        refreshButton.addTarget(self, action: #selector(uiOnlyTapped), for: .touchUpInside)
        batchButton.addTarget(self, action: #selector(uiOnlyTapped), for: .touchUpInside)
        specifyButton.addTarget(self, action: #selector(uiOnlyTapped), for: .touchUpInside)
    }

    private func makeChip(_ text: String) -> UIView {
        let label = UILabel()
        label.text = text
        label.font = .systemFont(ofSize: 11)
        label.textColor = AppColor.textTertiary
        label.backgroundColor = AppColor.pageBackground
        label.layer.cornerRadius = 8
        label.layer.borderWidth = 1
        label.layer.borderColor = AppColor.border.cgColor
        label.clipsToBounds = true
        label.textAlignment = .center
        return label
    }

    private func makeStat(title: String, count: Int, selected: Bool, danger: Bool) -> UIView {
        let container = UIView()
        let countLabel = UILabel()
        let titleLabel = UILabel()
        let underline = UIView()
        countLabel.text = "\(count)"
        countLabel.font = .systemFont(ofSize: 18, weight: .semibold)
        countLabel.textColor = selected ? AppColor.primary : (danger ? AppColor.danger : AppColor.textPrimary)
        countLabel.textAlignment = .center
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 13)
        titleLabel.textColor = selected ? AppColor.primary : AppColor.textSecondary
        titleLabel.textAlignment = .center
        underline.backgroundColor = selected ? AppColor.primary : .clear
        underline.layer.cornerRadius = 1
        container.addSubview(countLabel)
        container.addSubview(titleLabel)
        container.addSubview(underline)
        countLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(8)
            make.leading.trailing.equalToSuperview()
        }
        titleLabel.snp.makeConstraints { make in
            make.top.equalTo(countLabel.snp.bottom).offset(2)
            make.leading.trailing.equalToSuperview()
        }
        underline.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(4)
            make.centerX.equalToSuperview()
            make.width.equalTo(24)
            make.height.equalTo(2)
        }
        return container
    }

    private func configureBottomButton(_ button: UIButton, title: String, filled: Bool) {
        button.setTitle(title, for: .normal)
        button.titleLabel?.font = .systemFont(ofSize: 15)
        button.layer.cornerRadius = 10
        if filled {
            button.backgroundColor = AppColor.primary
            button.setTitleColor(.white, for: .normal)
        } else {
            button.backgroundColor = .white
            button.setTitleColor(AppColor.primary, for: .normal)
            button.layer.borderWidth = 1
            button.layer.borderColor = AppColor.primary.cgColor
        }
    }

    private func helpText() -> NSAttributedString {
        let text = NSMutableAttributedString(
            string: "未连接，查看",
            attributes: [.foregroundColor: AppColor.textSecondary]
        )
        text.append(NSAttributedString(string: "《帮助文档》", attributes: [.foregroundColor: AppColor.primary]))
        return text
    }

    @objc private func backTapped() {
        navigationController?.popViewController(animated: true)
    }

    @objc private func uiOnlyTapped() {
        viewModel.showUIOnlyMessage()
    }
}