import Foundation
import SwiftUI
import os.log
import Combine

/// 日志级别枚举
enum LogLevel: String, CaseIterable {
    case debug = "🔍"
    case info = "ℹ️"
    case warning = "⚠️"
    case error = "❌"
    case success = "✅"
    
    var localizedName: String {
        switch self {
        case .debug: return "调试"
        case .info: return "信息"
        case .warning: return "警告"
        case .error: return "错误"
        case .success: return "成功"
        }
    }
}

/// 日志管理器
class Logger: ObservableObject {
    static let shared = Logger()
    
    @Published var isEnabled = true
    @Published var minimumLevel: LogLevel = .debug
    
    private let dateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "HH:mm:ss"
        return formatter
    }()
    
    private init() {}
    
    /// 记录日志
    /// - Parameters:
    ///   - level: 日志级别
    ///   - message: 日志消息
    ///   - file: 文件名（自动获取）
    ///   - function: 函数名（自动获取）
    ///   - line: 行号（自动获取）
    ///   - className: 类名（可选）
    func log(
        _ level: LogLevel,
        _ message: String,
        file: String = #file,
        function: String = #function,
        line: Int = #line,
        className: String? = nil
    ) {
        guard isEnabled && shouldLog(level) else { return }
        
        let timestamp = dateFormatter.string(from: Date())
        let fileName = URL(fileURLWithPath: file).lastPathComponent
        let functionName = function
        let lineNumber = line
        let classDisplayName = className ?? "Unknown"
        
        let logMessage = "[\(timestamp)] \(level.rawValue) [\(classDisplayName)] [\(fileName):\(lineNumber)] \(functionName): \(message)"
        
        // 输出到控制台
        print(logMessage)
        
        // 同时输出到系统日志（可选）
        #if DEBUG
       // os_log("%{public}@", log: .default, type: .debug, logMessage)
        #endif
    }
    
    /// 检查是否应该记录该级别的日志
    private func shouldLog(_ level: LogLevel) -> Bool {
        let levelOrder: [LogLevel] = [.debug, .info, .warning, .error, .success]
        guard let currentIndex = levelOrder.firstIndex(of: minimumLevel),
              let messageIndex = levelOrder.firstIndex(of: level) else {
            return false
        }
        return messageIndex >= currentIndex
    }
    
    // MARK: - 便捷方法
    
    func debug(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
        log(.debug, message, file: file, function: function, line: line, className: className)
    }
    
    func info(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
        log(.info, message, file: file, function: function, line: line, className: className)
    }
    
    func warning(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
        log(.warning, message, file: file, function: function, line: line, className: className)
    }
    
    func error(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
        log(.error, message, file: file, function: function, line: line, className: className)
    }
    
    func success(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
        log(.success, message, file: file, function: function, line: line, className: className)
    }
}

// MARK: - 全局日志函数

/// 全局调试日志函数
func logDebug(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
    Logger.shared.debug(message, file: file, function: function, line: line, className: className)
}

/// 全局信息日志函数
func logInfo(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
    Logger.shared.info(message, file: file, function: function, line: line, className: className)
}

/// 全局警告日志函数
func logWarning(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
    Logger.shared.warning(message, file: file, function: function, line: line, className: className)
}

/// 全局错误日志函数
func logError(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
    Logger.shared.error(message, file: file, function: function, line: line, className: className)
}

/// 全局成功日志函数
func logSuccess(_ message: String, file: String = #file, function: String = #function, line: Int = #line, className: String? = nil) {
    Logger.shared.success(message, file: file, function: function, line: line, className: className)
}

// MARK: - 扩展：获取类名

extension NSObject {
    var className: String {
        return String(describing: type(of: self))
    }
    
    static var className: String {
        return String(describing: self)
    }
}

extension View {
    var className: String {
        return String(describing: type(of: self))
    }
}