using System;
using System.IO;
using System.Linq;
using System.Xml.Linq;
using System.Xml.XPath;
using NLog;
using NLog.Config;
using Ninject;

namespace NzbDrone.Providers
{
    public class ConfigProvider
    {
        private readonly EnviromentProvider _enviromentProvider;
        private static readonly Logger Logger = LogManager.GetLogger("Host.ConfigProvider");

        [Inject]
        public ConfigProvider(EnviromentProvider enviromentProvider)
        {
            _enviromentProvider = enviromentProvider;
        }

        public ConfigProvider()
        {

        }

        public virtual int PortNumber
        {
            get { return GetValueInt("Port"); }
        }

        public virtual bool LaunchBrowser
        {
            get { return GetValueBoolean("LaunchBrowser"); }
        }

        public virtual string IISDirectory
        {
            get { return Path.Combine(_enviromentProvider.ApplicationPath, "IISExpress"); }
        }

        public virtual string IISExePath
        {
            get { return Path.Combine(IISDirectory, "iisexpress.exe"); }
        }

        public virtual string IISConfigPath
        {
            get { return Path.Combine(IISDirectory, "AppServer", "applicationhost.config"); }
        }

        public virtual string AppDataDirectory
        {
            get { return Path.Combine(_enviromentProvider.ApplicationPath, "NzbDrone.Web", "App_Data"); }
        }

        public virtual string ConfigFile
        {
            get { return Path.Combine(AppDataDirectory, "Config.xml"); }
        }

        public virtual string NlogConfigPath
        {
            get { return Path.Combine(_enviromentProvider.ApplicationPath, "NzbDrone.Web\\log.config"); }
        }


        public virtual void ConfigureNlog()
        {
            LogManager.Configuration = new XmlLoggingConfiguration(NlogConfigPath, false);
        }

        public virtual void UpdateIISConfig(string configPath)
        {
            Logger.Info(@"Server configuration file: {0}", configPath);
            Logger.Info(@"Configuring server to: [http://localhost:{0}]", PortNumber);

            var configXml = XDocument.Load(configPath);

            var bindings =
                configXml.XPathSelectElement("configuration/system.applicationHost/sites").Elements("site").Where(
                    d => d.Attribute("name").Value.ToLowerInvariant() == "nzbdrone").First().Element("bindings");
            bindings.Descendants().Remove();
            bindings.Add(
                new XElement("binding",
                             new XAttribute("protocol", "http"),
                             new XAttribute("bindingInformation", String.Format("*:{0}:localhost", PortNumber))
                    ));

            bindings.Add(
                new XElement("binding",
                             new XAttribute("protocol", "http"),
                             new XAttribute("bindingInformation", String.Format("*:{0}:", PortNumber))
                    ));

            configXml.Save(configPath);
        }

        public virtual void CreateDefaultConfigFile()
        {
            //Create the config file here
            Directory.CreateDirectory(AppDataDirectory);

            if (!File.Exists(ConfigFile))
            {
                WriteDefaultConfig();
            }
        }

        private void WriteDefaultConfig()
        {
            var xDoc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"));

            xDoc.Add(new XElement("Config",
                                  new XElement("Port", 8989),
                                  new XElement("LaunchBrowser", true)
                         )
                );

            xDoc.Save(ConfigFile);
        }

        private string GetValue(string key, string parent = null)
        {
            var xDoc = XDocument.Load(ConfigFile);
            var config = xDoc.Descendants("Config").Single();

            var parentContainer = config;

            if (parent != null)
                parentContainer = config.Descendants(parent).Single();

            string value = parentContainer.Descendants(key).Single().Value;

            return value;
        }

        private int GetValueInt(string key, string parent = null)
        {
            return Convert.ToInt32(GetValue(key, parent));
        }

        private bool GetValueBoolean(string key, string parent = null)
        {
            return Convert.ToBoolean(GetValue(key, parent));
        }
    }
}