//
//  TravelAlbumTransferModeSheetViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 相册管理上传入口的传输模式选择弹窗。
final class TravelAlbumTransferModeSheetViewController: UIViewController {
    /// 用户选择传输模式后的回调；弹窗关闭后触发。
    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("transferMode")
            sheetPresentationController.detents = [
                .custom(identifier: identifier) { context in
                    min(356, context.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: 19, 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(makeOptionView(mode: mode, index: index))
        }

        cancelButton.setTitle("取消", for: .normal)
        cancelButton.setTitleColor(AppColor.textSecondary, for: .normal)
        cancelButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        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(14)
            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)
        }
    }

    /// 创建无需二次确认的模式选项，点击后直接进入下一页。
    private func makeOptionView(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 titleLabel = UILabel()
        titleLabel.text = mode.title
        titleLabel.font = .systemFont(ofSize: 16, weight: .semibold)
        titleLabel.textColor = AppColor.textPrimary

        let detailLabel = UILabel()
        detailLabel.text = mode.detailText
        detailLabel.font = .systemFont(ofSize: 12)
        detailLabel.textColor = AppColor.textSecondary
        detailLabel.numberOfLines = 2

        let enterLabel = UILabel()
        enterLabel.text = "进入"
        enterLabel.font = .systemFont(ofSize: 13, weight: .medium)
        enterLabel.textColor = AppColor.primary
        enterLabel.textAlignment = .right

        let button = UIButton(type: .custom)
        button.tag = index
        button.accessibilityLabel = "\(mode.title)，\(mode.detailText)"
        button.addTarget(self, action: #selector(modeTapped(_:)), for: .touchUpInside)

        container.addSubview(titleLabel)
        container.addSubview(detailLabel)
        container.addSubview(enterLabel)
        container.addSubview(button)
        titleLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(13)
            make.leading.equalToSuperview().offset(16)
            make.trailing.lessThanOrEqualTo(enterLabel.snp.leading).offset(-12)
        }
        detailLabel.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(5)
            make.leading.equalTo(titleLabel)
            make.trailing.lessThanOrEqualTo(enterLabel.snp.leading).offset(-12)
            make.bottom.lessThanOrEqualToSuperview().offset(-12)
        }
        enterLabel.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-16)
            make.centerY.equalToSuperview()
            make.width.equalTo(34)
        }
        button.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        container.snp.makeConstraints { make in
            make.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]
        // 先保留回调，避免弹窗关闭释放后无法进入对应模式页面。
        let completion = onModeSelected
        dismiss(animated: true) {
            completion?(mode)
        }
    }

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