using System;
using System.IO;
using System.Xml.Serialization;

namespace KevServer
{
    public class WebConfig
    {
        /// <summary>
        /// 图件路径
        /// </summary>
        public string MapDirectory { get; set; } = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Maps");

        /// <summary>
        ///  底图路径
        /// </summary>
        public string BaseMapDirectory { get; set; } = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "BaseMaps");

        /// <summary>
        /// 监听地址
        /// </summary>
        public string ListenUrl { get; set; }
        public static string ConfigFile { get; set; }
        public static string StartupPath { get; set; }
        private static WebConfig instance = null;

        private WebConfig()
        {
            var path = StartupPath;
            if (string.IsNullOrEmpty(path))
            {
                path = System.AppDomain.CurrentDomain.BaseDirectory;
            }
            ConfigFile = Path.Combine(path, "KevWebConfig.xml");
        }

        public static WebConfig Instance
        {
            get
            {
                if (instance == null)
                {
                    instance = new WebConfig();
                    if (instance.Open() == false)
                    {
                        DirectoryInfo di = new DirectoryInfo(StartupPath);
                        string strServerPath = di.Parent.FullName;
                        instance.MapDirectory = Path.Combine(strServerPath, "Maps");
                        instance.BaseMapDirectory = Path.Combine(strServerPath, "BaseMaps");
                        instance.Save();
                    }
                }
                return instance;
            }
            set
            {
                instance = value;
            }
        }

        /// <summary>
        /// 打开配置文件.
        /// </summary>
        /// <returns>是否成功</returns>
        public bool Open()
        {
            string strFile = ConfigFile;
            if (string.IsNullOrEmpty(strFile) || !File.Exists(strFile))
            {
                return false;
            }
            try
            {
                using (StreamReader reader = new StreamReader(strFile))
                {
                    XmlSerializer xmlSerializer = new XmlSerializer(typeof(WebConfig));
                    instance = xmlSerializer.Deserialize(reader) as WebConfig;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"加载 WebConfig 配置文件失败: ${ex.Message}");
                return false;
            }
            return true;
        }

        public void Save()
        {
            string strFile = ConfigFile;
            if (!File.Exists(strFile))
            {
                File.Create(strFile).Close();
            }
            using (StreamWriter writer = new StreamWriter(strFile))
            {
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(WebConfig));
                XmlSerializerNamespaces nameSpace = new XmlSerializerNamespaces();
                nameSpace.Add(string.Empty, string.Empty);
                xmlSerializer.Serialize(writer, instance, nameSpace);
            }
        }
    }
}