/// Version 1.0.0
/// Last modified 24.5.2014
///
/// Copyright (C) 2014 Atte Söderlund
///
/// Halyri-system is a prototype emergency call system. Its purpose is to
/// demonstrate the use of the advanced capabilities available in the current
/// generation smartphones in facilitating the emergency service dispatcher's
/// capability to determine the nature of the emergency and to dispatch help.
///
/// For more information, see the README file of this package.
///
/// The MIT License (MIT)
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to
/// deal in the Software without restriction, including without limitation the
/// rights to use, copy, modify, merge, publish, distribute, sublicense,
/// and/or sell copies of the Software, and to permit persons to whom the
/// Software is furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
/// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
/// IN THE SOFTWARE.
///

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.IsolatedStorage;
using System.Runtime.Serialization.Formatters.Binary;

namespace Hake_WPF
{
    /// <author>Atte Söderlund</author>
    /// <summary>
    /// The class is used to store a object specified with key. A user can add, update, get and remove the objects using the key.
    /// </summary>
    class Settings
    {
        private IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForAssembly();
        private BinaryFormatter formatter = new BinaryFormatter();
        private Dictionary<string, object> settings = new Dictionary<string, object>();

        // These should be used always as keys.
        /// <summary>
        /// The key for a object that contains the endpoint address.
        /// </summary>
        public const String ENDPOINTADDRESS = "endpointAddress";
        /// <summary>
        ///  The key for a object that contains the color for an assignment that is new and urgent.
        /// </summary>
        public const String NEWURGENTSTATECOLOR = "newUrgentStateColor";
        /// <summary>
        ///  The key for a object that contains the color of the graph line.
        /// </summary>
        public const String GRAPHLINECOLOR = "graphLineColor";
        /// <summary>
        /// The key for a object that contains the background color of the graph.
        /// </summary>
        public const String GRAPHBACKGROUNDCOLOR = "graphBackgroundColor";

        /// <summary>
        /// The function initializes settings by reading them from settings.cfg.
        /// </summary>
        public Settings()
        {
            try
            {
                using (var stream = store.OpenFile("settings.cfg", FileMode.OpenOrCreate, FileAccess.Read))
                {
                    settings = (Dictionary<string, object>)formatter.Deserialize(stream);
                }
            }
            catch(Exception)
            { }
        }

        /// <summary>
        /// The function adds or updates a object with the given key.
        /// </summary>
        /// <param name="key">The key that specifies the object.</param>
        /// <param name="obj">The object to store.</param>
        public void AddOrUpdate(String key, object obj)
        {
            if (settings.ContainsKey(key))
                settings.Remove(key);
            settings.Add(key,obj);
        }

        /// <summary>
        /// The function removes a object with the given key.
        /// </summary>
        /// <param name="key">The key that is used to remove a object.</param>
        public void Remove(String key)
        {
            if (settings.ContainsKey(key))
                settings.Remove(key);
        }

        /// <summary>
        /// The function returns object from settings that is stored using given key.
        /// </summary>
        /// <param name="key">Key string.</param>
        /// <returns>The stored object corresponding to the key.</returns>
        public object Get(String key)
        {
            if (settings.ContainsKey(key))
                return settings[key];
            return null;
        }

        /// <summary>
        /// The function saves the settings to the file settings.cfg if its not in use.
        /// </summary>
        /// <returns>True if no exceptions catched and false otherwise.</returns>
        public bool Save()
        {
            try
            {
                using (var stream = store.OpenFile("settings.cfg", FileMode.OpenOrCreate, FileAccess.Write))
                {
                    formatter.Serialize(stream, settings);
                }
            }
            catch(Exception)
            {
                return false;
            }
            return true;
        }
    }
}