import SnapKit
import UIKit

/// 注销页面共用的轻量视觉组件，仅负责颜色、字号和布局，不包含业务状态。
@MainActor
enum StoreAccountDeregistrationStyle {
    /// 创建支持多行的系统字体标签。
    static func label(_ text: String = "", size: CGFloat = 15, weight: UIFont.Weight = .regular,
                      color: UIColor = AppColor.textPrimary) -> UILabel {
        let label = UILabel()
        label.text = text
        label.font = .systemFont(ofSize: size, weight: weight)
        label.textColor = color
        label.numberOfLines = 0
        return label
    }

    /// 创建统一间距的纵向内容组。
    static func stack(_ views: [UIView], spacing: CGFloat = 12) -> UIStackView {
        let stack = UIStackView(arrangedSubviews: views)
        stack.axis = .vertical
        stack.spacing = spacing
        return stack
    }

    /// 白色圆角卡片，内容由页面提供。
    static func card(_ content: UIView) -> UIView {
        let card = UIView()
        card.backgroundColor = .white
        card.layer.cornerRadius = 16
        card.addSubview(content)
        content.snp.makeConstraints { $0.edges.equalToSuperview().inset(16) }
        return card
    }

    /// 统一主次按钮；禁用态及加载期间不依赖系统默认的灰底样式。
    static func button(_ title: String, id: String, primary: Bool = true) -> UIButton {
        let button = UIButton(type: .system)
        button.accessibilityIdentifier = id
        configure(button, title: title, primary: primary)
        button.snp.makeConstraints { $0.height.greaterThanOrEqualTo(50) }
        return button
    }

    /// 更新按钮角色和文案，保留清晰的主次关系。
    static func configure(_ button: UIButton, title: String, primary: Bool = true) {
        var config = primary ? UIButton.Configuration.filled() : .plain()
        config.title = title
        config.baseBackgroundColor = AppColor.primary
        config.baseForegroundColor = primary ? .white : AppColor.primary
        config.background.cornerRadius = 12
        config.contentInsets = .init(top: 14, leading: 16, bottom: 14, trailing: 16)
        config.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { attributes in
            var attributes = attributes
            attributes.font = UIFont.systemFont(ofSize: 16, weight: .semibold)
            return attributes
        }
        button.configuration = config
        button.configurationUpdateHandler = { button in
            let enabled = button.isEnabled
            var updated = button.configuration
            updated?.background.backgroundColorTransformer = UIConfigurationColorTransformer { _ in
                primary ? (enabled ? AppColor.primary : AppColor.primary.withAlphaComponent(0.12)) : .clear
            }
            updated?.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { attributes in
                var attributes = attributes
                attributes.font = UIFont.systemFont(ofSize: 16, weight: .semibold)
                attributes.foregroundColor = enabled ? (primary ? .white : AppColor.primary) : AppColor.textSecondary
                return attributes
            }
            button.configuration = updated
        }
    }

    /// 以统一的SF Symbol展示提示图标，不加载额外图片资源。
    static func icon(_ name: String, size: CGFloat = 22) -> UIImageView {
        let image = UIImageView(image: UIImage(systemName: name,
                                              withConfiguration: UIImage.SymbolConfiguration(pointSize: size, weight: .medium)))
        image.tintColor = AppColor.primary
        image.contentMode = .scaleAspectFit
        image.setContentHuggingPriority(.required, for: .horizontal)
        return image
    }
}