using System;
using System.Configuration;
using System.IO;
using System.Reflection;
using XP.Common.Logging.Interfaces;

namespace XP.Hardware.RaySource.Config
{
    /// <summary>
    /// 配置加载器 | Configuration Loader
    /// 从App.config读取配置，适配.NET 8 ConfigurationManager | Load configuration from App.config, adapted for .NET 8 ConfigurationManager
    /// </summary>
    public class ConfigLoader
    {
        private const string CONFIG_SECTION = "RaySource";

        /// <summary>
        /// 加载射线源配置 | Load X-ray source configuration
        /// </summary>
        /// <param name="configFilePath">配置文件路径（可选，默认使用App.config）| Configuration file path (optional, defaults to App.config)</param>
        /// <param name="logger">日志服务（可选）| Logger service (optional)</param>
        /// <returns>配置对象 | Configuration object</returns>
        public static RaySourceConfig LoadConfig(string configFilePath = null, ILoggerService logger = null)
        {
            var config = new RaySourceConfig();

            try
            {
                // 如果指定了配置文件路径，使用自定义配置文件
                // If a configuration file path is specified, use custom configuration file
                if (!string.IsNullOrEmpty(configFilePath) && File.Exists(configFilePath))
                {
                    var fileMap = new ExeConfigurationFileMap { ExeConfigFilename = configFilePath };
                    var configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
                    LoadFromConfiguration(config, configuration.AppSettings.Settings, logger);
                }
                else
                {
                    // 使用默认App.config | Use default App.config
                    LoadFromAppSettings(config, logger);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"[配置加载警告 | Config Load Warning] 使用默认配置: {ex.Message}");
                // 加载失败时返回默认配置 | Return default configuration on load failure
            }

            return config;
        }

        /// <summary>
        /// 从AppSettings加载配置 | Load configuration from AppSettings
        /// </summary>
        private static void LoadFromAppSettings(RaySourceConfig config, ILoggerService logger = null)
        {
            // PVI通讯参数 | PVI Communication Parameters
            config.SourceType = GetAppSetting(CONFIG_SECTION + ":" + "SourceType", config.SourceType);
            config.PlcIpAddress = GetAppSetting(CONFIG_SECTION + ":" + "PlcIpAddress", config.PlcIpAddress);
            config.PlcPort = GetAppSetting(CONFIG_SECTION + ":" + "PlcPort", config.PlcPort);
            config.StationNumber = GetAppSetting(CONFIG_SECTION + ":" + "StationNumber", config.StationNumber);
            config.PortNumber = GetAppSetting(CONFIG_SECTION + ":" + "PortNumber", config.PortNumber);
            config.CpuName = GetAppSetting(CONFIG_SECTION + ":" + "CpuName", config.CpuName);
            config.ConnectionTimeout = GetAppSetting(CONFIG_SECTION + ":" + "ConnectionTimeout", config.ConnectionTimeout);

            // 硬件参数范围 | Hardware Parameter Ranges
            config.MinVoltage = GetAppSetting(CONFIG_SECTION + ":" + "MinVoltage", config.MinVoltage);
            config.MaxVoltage = GetAppSetting(CONFIG_SECTION + ":" + "MaxVoltage", config.MaxVoltage);
            config.MinCurrent = GetAppSetting(CONFIG_SECTION + ":" + "MinCurrent", config.MinCurrent);
            config.MaxCurrent = GetAppSetting(CONFIG_SECTION + ":" + "MaxCurrent", config.MaxCurrent);

            // 外部程序配置 | External Program Configuration
            config.AdvanceExePath = GetAppSetting(CONFIG_SECTION + ":" + "AdvanceExePath", config.AdvanceExePath);

            // 操作超时配置 | Operation Timeout Configuration
            config.InitializationTimeout = GetAppSetting(CONFIG_SECTION + ":" + "InitializationTimeout", config.InitializationTimeout);
            config.WarmUpTimeout = GetAppSetting(CONFIG_SECTION + ":" + "WarmUpTimeout", config.WarmUpTimeout);
            config.StartUpTimeout = GetAppSetting(CONFIG_SECTION + ":" + "StartUpTimeout", config.StartUpTimeout);
            config.AutoCenterTimeout = GetAppSetting(CONFIG_SECTION + ":" + "AutoCenterTimeout", config.AutoCenterTimeout);
            config.FilamentAdjustTimeout = GetAppSetting(CONFIG_SECTION + ":" + "FilamentAdjustTimeout", config.FilamentAdjustTimeout);
            config.GeneralOperationTimeout = GetAppSetting(CONFIG_SECTION + ":" + "GeneralOperationTimeout", config.GeneralOperationTimeout);

            // 灯丝寿命配置 | Filament Lifetime Configuration
            config.SerialNumber = GetAppSetting(CONFIG_SECTION + ":" + "SerialNumber", config.SerialNumber);
            config.TotalLifeThreshold = GetAppSetting(CONFIG_SECTION + ":" + "TotalLifeThreshold", config.TotalLifeThreshold);
        }

        /// <summary>
        /// 从Configuration对象加载配置 | Load configuration from Configuration object
        /// </summary>
        private static void LoadFromConfiguration(RaySourceConfig config, KeyValueConfigurationCollection settings, ILoggerService logger = null)
        {
            config.SourceType = GetSetting(settings, CONFIG_SECTION + ":" + "SourceType", config.SourceType);
            config.PlcIpAddress = GetSetting(settings, CONFIG_SECTION + ":" + "PlcIpAddress", config.PlcIpAddress);
            config.PlcPort = GetSetting(settings, CONFIG_SECTION + ":" + "PlcPort", config.PlcPort);
            config.StationNumber = GetSetting(settings, CONFIG_SECTION + ":" + "StationNumber", config.StationNumber);
            config.PortNumber = GetSetting(settings, CONFIG_SECTION + ":" + "PortNumber", config.PortNumber);
            config.CpuName = GetSetting(settings, CONFIG_SECTION + ":" + "CpuName", config.CpuName);
            config.ConnectionTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "ConnectionTimeout", config.ConnectionTimeout);

            config.MinVoltage = GetSetting(settings, CONFIG_SECTION + ":" + "MinVoltage", config.MinVoltage);
            config.MaxVoltage = GetSetting(settings, CONFIG_SECTION + ":" + "MaxVoltage", config.MaxVoltage);
            config.MinCurrent = GetSetting(settings, CONFIG_SECTION + ":" + "MinCurrent", config.MinCurrent);
            config.MaxCurrent = GetSetting(settings, CONFIG_SECTION + ":" + "MaxCurrent", config.MaxCurrent);

            // 外部程序配置 | External Program Configuration
            config.AdvanceExePath = GetSetting(settings, CONFIG_SECTION + ":" + "AdvanceExePath", config.AdvanceExePath);

            config.InitializationTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "InitializationTimeout", config.InitializationTimeout);
            config.WarmUpTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "WarmUpTimeout", config.WarmUpTimeout);
            config.StartUpTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "StartUpTimeout", config.StartUpTimeout);
            config.AutoCenterTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "AutoCenterTimeout", config.AutoCenterTimeout);
            config.FilamentAdjustTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "FilamentAdjustTimeout", config.FilamentAdjustTimeout);
            config.GeneralOperationTimeout = GetSetting(settings, CONFIG_SECTION + ":" + "GeneralOperationTimeout", config.GeneralOperationTimeout);

            // 灯丝寿命配置 | Filament Lifetime Configuration
            config.SerialNumber = GetSetting(settings, CONFIG_SECTION + ":" + "SerialNumber", config.SerialNumber);
            config.TotalLifeThreshold = GetSetting(settings, CONFIG_SECTION + ":" + "TotalLifeThreshold", config.TotalLifeThreshold);
        }

        /// <summary>
        /// 保存配置到AppSettings | Save configuration to AppSettings
        /// </summary>
        public static void SaveConfigToAppSettings(RaySourceConfig config)
        {
            // 获取程序默认配置文件路径（对应 ConfigurationManager.AppSettings 的文件）
            Assembly entryAssembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
            string assemblyPath = entryAssembly.Location; 
            string defaultConfigPath = Path.ChangeExtension(assemblyPath, ".config");
            // 复用原有保存逻辑
            SaveConfig(config, defaultConfigPath);
            // 刷新 ConfigurationManager，让 AppSettings 立即读取最新值
            ConfigurationManager.RefreshSection("appSettings");
        }

        /// <summary>
        /// 保存配置到文件 | Save configuration to file
        /// </summary>
        public static void SaveConfig(RaySourceConfig config, string configFilePath)
        {
            try
            {
                var fileMap = new ExeConfigurationFileMap { ExeConfigFilename = configFilePath };
                var configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);

                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "SourceType", config.SourceType);
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "PlcIpAddress", config.PlcIpAddress);
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "PlcPort", config.PlcPort.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "StationNumber", config.StationNumber.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "PortNumber", config.PortNumber.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "CpuName", config.CpuName);
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "ConnectionTimeout", config.ConnectionTimeout.ToString());

                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "MinVoltage", config.MinVoltage.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "MaxVoltage", config.MaxVoltage.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "MinCurrent", config.MinCurrent.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "MaxCurrent", config.MaxCurrent.ToString());

                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "AdvanceExePath", config.AdvanceExePath);

                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "InitializationTimeout", config.InitializationTimeout.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "WarmUpTimeout", config.WarmUpTimeout.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "StartUpTimeout", config.StartUpTimeout.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "AutoCenterTimeout", config.AutoCenterTimeout.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "FilamentAdjustTimeout", config.FilamentAdjustTimeout.ToString());
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "GeneralOperationTimeout", config.GeneralOperationTimeout.ToString());

                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "SerialNumber", config.SerialNumber);
                SetSetting(configuration.AppSettings.Settings, CONFIG_SECTION + ":" + "TotalLifeThreshold", config.TotalLifeThreshold.ToString());

                configuration.Save(ConfigurationSaveMode.Modified);
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException($"保存配置失败: {ex.Message}", ex);
            }
        }

        #region 辅助方法 | Helper Methods

        private static string GetAppSetting(string key, string defaultValue)
        {
            return ConfigurationManager.AppSettings[key] ?? defaultValue;
        }

        private static int GetAppSetting(string key, int defaultValue)
        {
            var value = ConfigurationManager.AppSettings[key];
            return int.TryParse(value, out var result) ? result : defaultValue;
        }

        private static float GetAppSetting(string key, float defaultValue)
        {
            var value = ConfigurationManager.AppSettings[key];
            return float.TryParse(value, out var result) ? result : defaultValue;
        }

        private static bool GetAppSetting(string key, bool defaultValue)
        {
            var value = ConfigurationManager.AppSettings[key];
            return bool.TryParse(value, out var result) ? result : defaultValue;
        }

        private static string GetSetting(KeyValueConfigurationCollection settings, string key, string defaultValue)
        {
            return settings[key]?.Value ?? defaultValue;
        }

        private static int GetSetting(KeyValueConfigurationCollection settings, string key, int defaultValue)
        {
            var value = settings[key]?.Value;
            return int.TryParse(value, out var result) ? result : defaultValue;
        }

        private static float GetSetting(KeyValueConfigurationCollection settings, string key, float defaultValue)
        {
            var value = settings[key]?.Value;
            return float.TryParse(value, out var result) ? result : defaultValue;
        }

        private static bool GetSetting(KeyValueConfigurationCollection settings, string key, bool defaultValue)
        {
            var value = settings[key]?.Value;
            return bool.TryParse(value, out var result) ? result : defaultValue;
        }

        private static void SetSetting(KeyValueConfigurationCollection settings, string key, string value)
        {
            if (settings[key] == null)
                settings.Add(key, value);
            else
                settings[key].Value = value;
        }

        #endregion
    }
}