//
//  WiredTransferSettingChipButton.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 有线传输页设置 chip 按钮，通过子视图展示标题与可选下拉箭头，不依赖 `UIButton` 原生 title 样式。
final class WiredTransferSettingChipButton: UIButton {
    private let titleLabelView = UILabel()
    private let chevronView = UIImageView()
    private var titleTrailingToSuperviewConstraint: Constraint?
    private var titleTrailingToChevronConstraint: Constraint?

    /// 是否展示右侧下拉箭头。
    var showsChevron: Bool {
        didSet { updateChevronLayout() }
    }

    /// 当前展示的标题文案。
    private(set) var titleText: String = ""

    /// 创建设置 chip 按钮。
    /// - Parameter showsChevron: 是否展示下拉箭头，默认不展示。
    init(showsChevron: Bool = false) {
        self.showsChevron = showsChevron
        super.init(frame: .zero)
        setupUI()
        updateChevronLayout()
    }

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

    /// 更新 chip 标题文案。
    func apply(title: String) {
        titleText = title
        titleLabelView.text = title
        accessibilityLabel = title
    }

    private func setupUI() {
        backgroundColor = AppColor.pageBackground
        layer.cornerRadius = 8
        layer.borderWidth = 1
        layer.borderColor = AppColor.border.cgColor

        titleLabelView.font = .systemFont(ofSize: 11)
        titleLabelView.textColor = AppColor.textTertiary
        titleLabelView.lineBreakMode = .byTruncatingTail
        titleLabelView.isUserInteractionEnabled = false

        chevronView.image = UIImage(systemName: "chevron.down")?
            .withConfiguration(UIImage.SymbolConfiguration(pointSize: 13, weight: .semibold))
        chevronView.tintColor = AppColor.textTertiary
        chevronView.contentMode = .scaleAspectFit
        chevronView.isUserInteractionEnabled = false

        addSubview(titleLabelView)
        addSubview(chevronView)

        titleLabelView.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(10)
            make.centerY.equalToSuperview()
            titleTrailingToSuperviewConstraint = make.trailing.lessThanOrEqualToSuperview().offset(-10).constraint
            titleTrailingToChevronConstraint = make.trailing.lessThanOrEqualTo(chevronView.snp.leading).offset(-4).constraint
        }
        chevronView.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-10)
            make.centerY.equalToSuperview()
            make.size.equalTo(16)
        }
    }

    private func updateChevronLayout() {
        chevronView.isHidden = !showsChevron
        if showsChevron {
            titleTrailingToSuperviewConstraint?.deactivate()
            titleTrailingToChevronConstraint?.activate()
        } else {
            titleTrailingToChevronConstraint?.deactivate()
            titleTrailingToSuperviewConstraint?.activate()
        }
    }
}