import Foundation

// MARK: - API Loading State

/// API 加载状态枚举
enum APILoadingState: Equatable {
    case loading                    // 正在加载
    case error(message: String)     // 加载失败，包含错误信息
    case success                    // 加载成功
}

// MARK: - API Loading Item

/// 单个 API 加载项
struct APILoadingItem: Identifiable, Equatable {
    let id: UUID
    let state: APILoadingState
    let shouldShowError: Bool       // 是否显示错误信息
    let shouldShowLoading: Bool     // 是否显示loading动画
    let createdAt: Date
    
    init(id: UUID = UUID(), state: APILoadingState, shouldShowError: Bool = true, shouldShowLoading: Bool = true) {
        self.id = id
        self.state = state
        self.shouldShowError = shouldShowError
        self.shouldShowLoading = shouldShowLoading
        self.createdAt = Date()
    }
    
    /// 是否应该显示此项目
    var shouldDisplay: Bool {
        switch state {
        case .loading:
            return shouldShowLoading
        case .error:
            return shouldShowError
        case .success:
            return false
        }
    }
    
    /// 是否是错误状态
    var isError: Bool {
        if case .error = state {
            return true
        }
        return false
    }
    
    /// 获取错误信息
    var errorMessage: String? {
        if case .error(let message) = state {
            return message
        }
        return nil
    }
}

// MARK: - API Loading Configuration

/// API Loading 配置
struct APILoadingConfiguration {
    /// Loading 视图大小
    static let loadingSize: CGFloat = 88
    /// 背景透明度
    static let backgroundAlpha: CGFloat = 0.6
    /// 圆角大小
    static let cornerRadius: CGFloat = 12
    /// 错误信息显示时长（秒）
    static let errorDisplayDuration: TimeInterval = 2.0
    /// 动画时长
    static let animationDuration: Double = 0.3
}