import SnapKit
import UIKit

/// 相册管理上传入口的传输模式选择 Sheet。
final class TravelAlbumTransferModeSheetViewController: UIViewController {
    var onModeSelected: ((TravelAlbumOTGTransferMode) -> Void)?

    private let titleLabel = UILabel()
    private let subtitleLabel = UILabel()
    private let optionsStack = UIStackView()
    private let cancelButton = UIButton(type: .system)

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        modalPresentationStyle = .pageSheet
        if let sheetPresentationController {
            let identifier = UISheetPresentationController.Detent.Identifier("travelAlbumTransferMode")
            sheetPresentationController.detents = [
                .custom(identifier: identifier) { min(356, $0.maximumDetentValue) },
            ]
            sheetPresentationController.selectedDetentIdentifier = identifier
            sheetPresentationController.prefersGrabberVisible = true
            sheetPresentationController.preferredCornerRadius = 22
        }
    }

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

    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        setupConstraints()
    }

    private func setupUI() {
        view.backgroundColor = .white
        titleLabel.text = "选择传输模式"
        titleLabel.font = .systemFont(ofSize: 20, weight: .semibold)
        titleLabel.textColor = AppColor.textPrimary
        titleLabel.textAlignment = .center
        subtitleLabel.text = "选择后进入对应的照片传输页面"
        subtitleLabel.font = .systemFont(ofSize: 13)
        subtitleLabel.textColor = AppColor.textSecondary
        subtitleLabel.textAlignment = .center
        optionsStack.axis = .vertical
        optionsStack.spacing = 12
        TravelAlbumOTGTransferMode.allCases.enumerated().forEach { index, mode in
            optionsStack.addArrangedSubview(makeOption(mode: mode, index: index))
        }
        cancelButton.setTitle("取消", for: .normal)
        cancelButton.setTitleColor(AppColor.textSecondary, for: .normal)
        cancelButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .semibold)
        cancelButton.backgroundColor = UIColor(hex: 0xF4F5F7)
        cancelButton.layer.cornerRadius = 12
        cancelButton.addTarget(self, action: #selector(cancelTapped), for: .touchUpInside)
        view.addSubview(titleLabel)
        view.addSubview(subtitleLabel)
        view.addSubview(optionsStack)
        view.addSubview(cancelButton)
    }

    private func setupConstraints() {
        titleLabel.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide).offset(12)
            make.leading.trailing.equalToSuperview().inset(20)
        }
        subtitleLabel.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(7)
            make.leading.trailing.equalToSuperview().inset(20)
        }
        optionsStack.snp.makeConstraints { make in
            make.top.equalTo(subtitleLabel.snp.bottom).offset(18)
            make.leading.trailing.equalToSuperview().inset(16)
        }
        cancelButton.snp.makeConstraints { make in
            make.top.equalTo(optionsStack.snp.bottom).offset(14)
            make.leading.trailing.equalTo(optionsStack)
            make.height.equalTo(48)
            make.bottom.lessThanOrEqualTo(view.safeAreaLayoutGuide).offset(-10)
        }
    }

    private func makeOption(mode: TravelAlbumOTGTransferMode, index: Int) -> UIView {
        let container = UIView()
        container.backgroundColor = UIColor(hex: 0xF7F9FC)
        container.layer.cornerRadius = 12
        container.layer.borderWidth = 1
        container.layer.borderColor = UIColor(hex: 0xE6ECF5).cgColor
        let title = UILabel()
        title.text = mode.title
        title.font = .systemFont(ofSize: 16, weight: .semibold)
        title.textColor = AppColor.textPrimary
        let detail = UILabel()
        detail.text = mode.detailText
        detail.font = .systemFont(ofSize: 12)
        detail.textColor = AppColor.textSecondary
        detail.numberOfLines = 2
        let enter = UILabel()
        enter.text = "进入"
        enter.font = .systemFont(ofSize: 13, weight: .semibold)
        enter.textColor = AppColor.primary
        let button = UIButton(type: .custom)
        button.tag = index
        button.accessibilityLabel = "\(mode.title)，\(mode.detailText)"
        button.addTarget(self, action: #selector(modeTapped(_:)), for: .touchUpInside)
        container.addSubview(title)
        container.addSubview(detail)
        container.addSubview(enter)
        container.addSubview(button)
        title.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(13)
            make.leading.equalToSuperview().offset(16)
            make.trailing.lessThanOrEqualTo(enter.snp.leading).offset(-12)
        }
        detail.snp.makeConstraints { make in
            make.top.equalTo(title.snp.bottom).offset(5)
            make.leading.equalTo(title)
            make.trailing.lessThanOrEqualTo(enter.snp.leading).offset(-12)
        }
        enter.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-16)
            make.centerY.equalToSuperview()
        }
        button.snp.makeConstraints { $0.edges.equalToSuperview() }
        container.snp.makeConstraints { $0.height.equalTo(78) }
        return container
    }

    @objc private func modeTapped(_ sender: UIButton) {
        guard TravelAlbumOTGTransferMode.allCases.indices.contains(sender.tag) else { return }
        let mode = TravelAlbumOTGTransferMode.allCases[sender.tag]
        let completion = onModeSelected
        dismiss(animated: true) { completion?(mode) }
    }

    @objc private func cancelTapped() { dismiss(animated: true) }
}