using RhythmBullet.Zer01HD.Preferences;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Xml.Serialization;

namespace RhythmBullet.Zer01HD.Utilities.Persistence
{
    public class PreferencesManager
    {
        private readonly Dictionary<Type, Preferences> preferenceList;
        string savePath;
        XmlSerializer xmlSerializer;

        public PreferencesManager(string savePath, params Preferences[] preferences)
        {
            this.savePath = savePath;
            Directory.CreateDirectory(savePath);
            preferenceList = new Dictionary<Type, Preferences>();
            Debug.WriteLine("Preference manager setting up...");
            Type[] preferenceTypes = new Type[preferences.Length];
            for (int prefID = 0; prefID < preferences.Length; prefID++)
            {
                preferenceList.Add(preferences[prefID].GetType(), preferences[prefID]);
                preferenceTypes[prefID] = preferences[prefID].GetType();
                Debug.WriteLine(preferences[prefID] + " added to list of preferences");
            }

            xmlSerializer = new XmlSerializer(typeof(Preferences), preferenceTypes);
        }

        public T GetPreferences<T>() where T : Preferences
        {
            return (T)preferenceList[typeof(T)];
        }

        public void Load()
        {
            foreach (KeyValuePair<Type, Preferences> prefs in preferenceList)
            {
                if (!LoadSpecific(prefs.Key))
                {
                    SaveSpecific(prefs.Key);
                }
            }
        }

        public void Save()
        {
            foreach (KeyValuePair<Type, Preferences> prefs in preferenceList)
            {
                SaveSpecific(prefs.Key);
            }
        }

        private bool LoadSpecific(Type preference)
        {
            string path = savePath + "/" + preference.Name;
            if (File.Exists(path))
            {
                Stream stream = new FileStream(savePath + "/" + preference.Name + ".xml", FileMode.Open);
                preferenceList[preference] = (Preferences)xmlSerializer.Deserialize(stream);
                stream.Close();
                return true;
            }
            return false;
        }

        private void SaveSpecific(Type preference)
        {
            Stream stream = new FileStream(savePath + "/" + preference.Name + ".xml", FileMode.Create);
            xmlSerializer.Serialize(stream, preferenceList[preference]);
            stream.Close();
        }
    }
}