/* Copyright (C) 2014-2018 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
 *
 * You can redistribute this program and/or modify it under the terms of
 * the GNU Lesser Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 */

using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using System.Xml;

namespace SMBServer
{
    public class SettingsHelper
    {
        public const string SettingsFileName = "Settings.xml";

        public static XmlDocument ReadXmlDocument(string path)
        {
            var doc = new XmlDocument();
            doc.Load(path);
            return doc;
        }

        public static XmlDocument ReadSettingsXML()
        {
            var executableDirectory = Path.GetDirectoryName(Application.ExecutablePath) + "\\";
            var document = ReadXmlDocument(executableDirectory + SettingsFileName);
            return document;
        }

        public static UserCollection ReadUserSettings()
        {
            var users = new UserCollection();
            var document = ReadSettingsXML();
            var usersNode = document.SelectSingleNode("Settings/Users");

            foreach (XmlNode userNode in usersNode.ChildNodes)
            {
                var accountName = userNode.Attributes["AccountName"].Value;
                var password = userNode.Attributes["Password"].Value;
                users.Add(accountName, password);
            }
            return users;
        }

        public static List<ShareSettings> ReadSharesSettings()
        {
            var shares = new List<ShareSettings>();
            var document = ReadSettingsXML();
            var sharesNode = document.SelectSingleNode("Settings/Shares");

            foreach (XmlNode shareNode in sharesNode.ChildNodes)
            {
                var shareName = shareNode.Attributes["Name"].Value;
                var sharePath = shareNode.Attributes["Path"].Value;

                var readAccessNode = shareNode.SelectSingleNode("ReadAccess");
                var readAccess = ReadAccessList(readAccessNode);
                var writeAccessNode = shareNode.SelectSingleNode("WriteAccess");
                var writeAccess = ReadAccessList(writeAccessNode);
                var share = new ShareSettings(shareName, sharePath, readAccess, writeAccess);
                shares.Add(share);
            }
            return shares;
        }

        private static List<string> ReadAccessList(XmlNode node)
        {
            var result = new List<string>();
            if (node != null)
            {
                var accounts = node.Attributes["Accounts"].Value;
                if (accounts == "*")
                {
                    result.Add("Users");
                }
                else
                {
                    var splitted = accounts.Split(',');
                    result.AddRange(splitted);
                }
            }
            return result;
        }

        public static Dictionary<string, string> ReadConfigs()
        {
            var document = ReadSettingsXML();
            var configs = document.SelectSingleNode("Settings/Configs");
            
            var dic = new Dictionary<string, string>();
            if (null == configs) return dic;

            foreach (XmlElement element in configs)
            {
                var key = element.Attributes["Key"]?.Value;
                var value = element.Attributes["Value"]?.Value;

                if (false == string.IsNullOrEmpty(key) && false == string.IsNullOrEmpty(value)) dic[key] = value;
            }

            return dic;
        }
    }
}