using S7.Net;
using System.Xml.Linq;

namespace xicheji
{
    public class ConfigHelper
    {
        private const string configFileName = "config.xml";
        private static Config? _config;

        public static Config GetConfig()
        {
            _config ??= LoadConfig();
            return _config;
        }

        private static Config LoadConfig()
        {
            if (!File.Exists(configFileName))
            {
                return new Config();
            }

            var xdoc = XDocument.Load(configFileName);
            if (xdoc.Root == null)
            {
                return new Config();
            }

            var config = new Config
            {
                ServicePort = xdoc.Root!.Element("Service")?.Attribute("Port")?.Value ?? "9999",
                DBString = xdoc.Root!.Element("Service")?.Attribute("DBString")?.Value ?? "DataSource=xicheji.db",

                Server = xdoc.Root!.Element("Platform")?.Attribute("Server")?.Value ?? "",
                UploadInterval = int.Parse(xdoc.Root!.Element("Platform")?.Attribute("ReceiveInterval")?.Value ?? "2"),
            };

            var device = xdoc.Root!.Element("Device");
            config.PLCIP = device?.Attribute("IP")?.Value ?? "";
            config.PLCPort = device?.Attribute("Port")?.Value ?? "";
            config.PLCType = Enum.Parse<CpuType>(device?.Attribute("Type")?.Value ?? "S7200");
            config.PLCReceiveInterval = int.Parse(device?.Attribute("ReceiveInterval")?.Value ?? "2");
            config.PLCMacAddress = device?.Attribute("MacAddress")?.Value ?? "";

            var camera = xdoc.Root!.Element("Camera");
            config.CameraIP = camera?.Attribute("IP")?.Value ?? "";
            config.CameraPort = camera?.Attribute("Port")?.Value ?? "";
            config.CameraUserName = camera?.Attribute("UserName")?.Value ?? "";
            config.CameraPassword = camera?.Attribute("Password")?.Value ?? "";

            var variablesRoot = xdoc.Root!.Element("Variables");
            if (variablesRoot != null)
            {
                config.DBName = variablesRoot.Attribute("DBName")?.Value ?? "DB1";
                var variables = variablesRoot.Elements("Variable");
                foreach (XElement item in variables)
                {
                    var variable = new Variable
                    {
                        Name = item.Attribute("Name")?.Value ?? "",
                        Key = config.DBName + "." + item.Attribute("Key")?.Value ?? "",
                        Desc = item.Attribute("Desc")?.Value ?? ""
                    };
                    if (string.IsNullOrEmpty(variable.Name) || string.IsNullOrEmpty(variable.Key))
                    {
                        continue;
                    }

                    config.Variables.Add(variable);
                }
            }

            return config;
        }

        public static void SaveConfig(Config config)
        {
            var xdoc = XDocument.Load(configFileName);
            var xService = xdoc.Root!.Element("Service");
            xService?.SetAttributeValue("Port", config.ServicePort);
            xService?.SetAttributeValue("DBString", config.DBString);

            var xPlatform = xdoc.Root!.Element("Platform");
            xPlatform?.SetAttributeValue("Server", config.Server);
            xPlatform?.SetAttributeValue("UploadInterval", config.UploadInterval);

            var xDevice = xdoc.Root!.Element("Device");
            xDevice?.SetAttributeValue("IP", config.PLCIP);
            xDevice?.SetAttributeValue("Port", config.PLCPort);
            xDevice?.SetAttributeValue("Type", config.PLCType.ToString());
            xDevice?.SetAttributeValue("ReceiveInterval", config.PLCReceiveInterval);
            xDevice?.SetAttributeValue("MacAddress", config.PLCMacAddress);

            var xCamera = xdoc.Root!.Element("Camera");
            xCamera?.SetAttributeValue("IP", config.CameraIP);
            xCamera?.SetAttributeValue("Port", config.CameraPort);
            xCamera?.SetAttributeValue("UserName", config.CameraUserName);
            xCamera?.SetAttributeValue("Password", config.CameraPassword);

            xdoc.Save(configFileName);
        }

        public static Variable? FindVariable(string variableName)
        {
            var config = GetConfig();

            var variable = config.Variables.Find(x => x.Name == variableName);

            return variable;
        }
    }

    public class Config
    {
        public string ServicePort { get; set; } = string.Empty;
        public string DBString { get; set; } = string.Empty;

        public string Server { get; set; } = string.Empty;
        public int UploadInterval { get; internal set; }

        public string PLCIP { get; set; } = string.Empty;
        public string PLCPort { get; set; } = string.Empty;
        public CpuType PLCType { get; set; } = CpuType.S7200;
        public string PLCMacAddress { get; set; } = string.Empty;
        public int PLCReceiveInterval { get; set; } = 2;

        public string CameraIP { get; set; } = string.Empty;
        public string CameraPort { get; set; } = string.Empty;
        public string CameraUserName { get; set; } = string.Empty;
        public string CameraPassword { get; set; } = string.Empty;
        public string DBName { get; set; } = string.Empty;

        public List<Variable> Variables { get; set; } = new();
    }

    public class Variable
    {
        public string Name { get; set; } = string.Empty;
        public string Key { get; set; } = string.Empty;
        public string Desc { get; set; } = string.Empty;
    }
}