using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Xml.Serialization;

namespace RecrownedGTK.Persistence
{
    /// <summary>
    /// Manages a bundle of preferences.
    /// </summary>
    public class Preferences
    {
        private Dictionary<string, string> preferences;
        string savePath;
        string fileName;
        XmlSerializer xmlSerializer;

        /// <summary>
        /// Constructs the preference manager.
        /// </summary>
        /// <param name="savePath">The path of the directory in which the preferences should be saved.</param>
        /// <param name="preferences">The preferences to be serialized and unserialized in XML format.</param>
        public Preferences(string savePath, string fileName)
        {
            this.savePath = savePath;
            this.fileName = fileName;

            Directory.CreateDirectory(savePath);
            preferences = new Dictionary<string, string>();
            xmlSerializer = new XmlSerializer(typeof(PreferencesInfo));
        }

        public string GetStringValue(string key) {
            if (!preferences.ContainsKey(key)) {
                preferences.Add(key, "");
            }
            return preferences[key];
        }
        public int GetIntValue(string key) {
            return int.Parse(GetStringValue(key));
        }
        public float GetFloatValue(string key) {
            return float.Parse(GetStringValue(key));
        }
        public bool GetBoolValue(string key) {
            return bool.Parse(GetStringValue(key));
        }

        public void SetPreference(string key, string value) {
            if (preferences.ContainsKey(key)) {
                preferences[key] = value;
            } else {
                preferences.Add(key, value);
            }
        }
        public void SetPreference(string key, int value) {
            SetPreference(key, value.ToString());
        }
        public void SetPreference(string key, float value) {
            SetPreference(key, value.ToString());
        }
        public void SetPreference(string key, bool value) {
            SetPreference(key, value.ToString());
        }

        public bool DeletePreference(string key) {
            if (!preferences.ContainsKey(key)) return false;
            preferences.Remove(key);
            return true;
        }

        /// <summary>
        /// Loads preferences.
        /// </summary>
        public bool Load()
        {
            try {
                using (StreamReader stream = new StreamReader(string.Format("{0}/{1}.xml", savePath, fileName))) {
                    this.preferences = ((PreferencesInfo) xmlSerializer.Deserialize(stream)).GetPreferences();
                }
            } catch (FileNotFoundException) {
                return false;
            }
            return true;
        }

        /// <summary>
        /// Saves preferences.
        /// </summary>
        public void Save()
        {
            using (FileStream fileStream = new FileStream(string.Format("{0}/{1}.xml", savePath, fileName), FileMode.Create)) {
                PreferencesInfo preferences = new PreferencesInfo();
                preferences.SetPreferences(this.preferences);
                xmlSerializer.Serialize(fileStream, preferences);
            }
        }
    }
}