using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using WingServerCommon.Config.Parameters;

namespace WingServerCommon.Config
{
    /// <summary>
    /// This class will load a glabal server configuration
    /// </summary>
    public class ConfigurationManager
    {
        private static IEnumerable<IParameter> _parameters;
        /// <summary>
        /// The listening server gateway port
        /// </summary>
        /// <value></value>
        public static string Host { get; private set; }

        /// <summary>
        /// Indicates the server will be deployed as distributed system
        /// </summary>
        /// <value></value>
        public static bool IsDistributed { get; set; }

        /// <summary>
        /// Indicates the server is master
        /// </summary>
        /// <value></value>
        public static bool IsMaster { get; set; }

        /// <summary>
        /// The master server url
        /// </summary>
        /// <value></value>
        public static string MasterUrl { get; set; }

        /// <summary>
        /// Log settings from configuration file
        /// </summary>
        /// <value></value>
        public static LogSettings? LogSettings { get; private set; }

        /// <summary>
        /// Email settings from configuration file
        /// </summary>
        /// <value></value>
        public static EmailSettings? EmailSettings { get; private set; }

        /// <summary>
        /// Storage settings is from configuration file
        /// </summary>
        /// <value></value>
        public static StorageSettings? StorageSettings { get; private set; }

        /// <summary>
        ///  Remedical settings is from configuration file
        /// </summary>
        /// <value></value>
        public static RemedicalSettings? RemedicalSettings { get; private set; }
        /// <summary>
        /// Notification Service Settings is from configuration file
        /// </summary>
        /// <value></value>
        public static NotificationSettings? NotificationSettings { get; private set; }

        static ConfigurationManager()
        {
            var configFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "appsettings.json");
            _parameters = ParameterSerializer.Deserialize(configFilePath);

            LoadConfiguration();
        }

        public static void ReloadConfig()
        {
            var configFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "appsettings.json");
            _parameters = ParameterSerializer.Deserialize(configFilePath);

            LoadConfiguration();
        }

        /// <summary>
        /// Get parameter by specifed section name and parameter name
        /// </summary>
        /// <typeparam name="T"></typeparam>
        public static T GetParammeter<T>(string sectionName, string paramName) where T : class
        {
            var parameter = _parameters.FirstOrDefault(x => x.Section == sectionName && x.Name == paramName) as T;
            if (parameter != null)
            {
                return parameter;
            }

            throw new System.ArgumentException($"{sectionName} - {paramName} not set correct");
        }

        /// <summary>
        /// Get value by section name and item key
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sectionName">The parameter section name</param>
        /// <param name="key">The parameter key</param>
        /// <param name="defaultValue">The parameter default value</param>
        /// <returns></returns>
        public static T GetValue<T>(string sectionName, string key, T defaultValue)
        {
            var t = typeof(T);
            var itemValue = _parameters.FirstOrDefault(q => q.Section == sectionName && q.Name == key);
            if (itemValue == null)
            {
                return defaultValue;
            }
            object value = null;
            var type = itemValue.GetType();
            if (type == typeof(StringParameter))
            {
                value = ((StringParameter)itemValue).Value;
            }
            if (type == typeof(IntParameter))
            {
                value = ((IntParameter)itemValue).Value.ToString();
            }
            if (type == typeof(BoolParameter))
            {
                value = ((BoolParameter)itemValue).Value.ToString();
            }
            if (type == typeof(EnumStringParameter))
            {
                value = ((EnumStringParameter)itemValue).Source;
            }
            if (t == typeof(bool) && (value?.ToString() == "0" || value?.ToString() == "1"))
            {
                return (T)(object)(value?.ToString() != "0");
            }
            return (T)Convert.ChangeType(value, t);
        }

        private static void LoadConfiguration()
        {
            Host = GetParammeter<StringParameter>("Gateway", "Host").Value;
            IsDistributed = GetParammeter<BoolParameter>("General", "IsDistributed").Value;
            IsMaster = GetParammeter<BoolParameter>("General", "IsMaster").Value;
            MasterUrl = GetParammeter<StringParameter>("General", "MasterUrl").Value;

            EmailSettings = new EmailSettings(); //TODO load from settings

            //TODO load log settings
            var debugMode = ConfigurationManager.GetParammeter<BoolParameter>("Log", "Debug").Value;
            var traceLevelString = ConfigurationManager.GetParammeter<StringParameter>("Log", "Level").Value;
            if (!Enum.TryParse(traceLevelString, true, out TraceLevel traceLevel))
            {
                traceLevel = TraceLevel.Info;
            }
            LogSettings = new LogSettings(debugMode, traceLevel);
            LoadRemedicalConfig();
            LoadStorageConfig();
            //TODO others      
        }

        /// <summary>
        /// load  remedical config
        /// </summary>
        private static void LoadRemedicalConfig()
        {
            RemedicalSettings = new RemedicalSettings()
            {
                IsUploadThumbnail = GetParammeter<BoolParameter>("Remedical", "IsUploadThumbnail").Value,
            };
        }

        /// <summary>
        /// 加载 存储服务 配置
        /// </summary>
        /// <returns></returns>
        private static void LoadStorageConfig()
        {
            StorageSettings = new StorageSettings()
            {
                DefaultStorageServer = GetParammeter<StringParameter>("Storage", "StorageServer").Value == "Vinno" ?
                StorageServerEnum.Vinno : StorageServerEnum.Tencent,
                CFSServerUrl = GetParammeter<StringParameter>("Storage", "CFSServerUrl").Value,
                CDNServerUrl = GetParammeter<StringParameter>("Storage", "CDNServerUrl").Value,
                Sercret = GetParammeter<StringParameter>("Storage", "Sercret").Value,
                AppId = GetParammeter<StringParameter>("Storage", "AppId").Value,
            };
        }

        /// <summary>
        /// 重新设置cfs地址
        /// </summary>
        /// <returns></returns>
        public static void SetStorageCFSServerUrl(string cfsUrl)
        {
            StorageSettings.CFSServerUrl = cfsUrl;
        }
    }
}