using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using MatterHackers.MatterControl;


namespace MatterHackers.MatterControl
{
	public class PrinterSettings
    {
		static PrinterSettings globalInstance = null;
		public Dictionary<string, DataStorage.PrinterSetting> settingsDictionary;
		int ActiveSettingsPrinterId = -1;

		public static PrinterSettings Instance
        {
            get
            {
                if (globalInstance == null)
                {
					globalInstance = new PrinterSettings();
                    globalInstance.LoadData();
                }

                return globalInstance;
            }
        }

		void LoadDataIfNeeded()
		{
			//Lazy load the data (rather than hook to printer change event)
			if (ActivePrinterProfile.Instance.ActivePrinter.Id != ActiveSettingsPrinterId) 
			{
				LoadData ();
			}
		}

        public string get(string key)
        {
			string result = null;
			if (ActivePrinterProfile.Instance.ActivePrinter == null) 
			{
				//No printer selected
			} 
			else 
			{

				LoadDataIfNeeded ();

				if (settingsDictionary.ContainsKey (key)) 
				{
					result = settingsDictionary [key].Value;
				}
			}
			return result;
        }

        public void set(string key, string value)
        {
			if (ActivePrinterProfile.Instance.ActivePrinter == null) 
			{
				//No printer selected
			} 
			else 
			{
				LoadDataIfNeeded ();

				DataStorage.PrinterSetting setting;
				if (settingsDictionary.ContainsKey(key))
				{
					setting = settingsDictionary[key];
				}
				else
				{
					setting = new DataStorage.PrinterSetting();
					setting.Name = key;
					setting.PrinterId = ActivePrinterProfile.Instance.ActivePrinter.Id;

					settingsDictionary[key] = setting;
				}

				setting.Value = value;
				setting.Commit();
			}
        }

        private void LoadData()
        {
			if (ActivePrinterProfile.Instance.ActivePrinter != null) {
				IEnumerable<DataStorage.PrinterSetting> settingsList = GetPrinterSettings ();
				settingsDictionary = new Dictionary<string, DataStorage.PrinterSetting> ();
				foreach (DataStorage.PrinterSetting s in settingsList) {
					settingsDictionary [s.Name] = s;
				}
				ActiveSettingsPrinterId = ActivePrinterProfile.Instance.ActivePrinter.Id;
			}

        }

		IEnumerable<DataStorage.PrinterSetting> GetPrinterSettings()
        {
            //Retrieve a list of settings from the Datastore
			string query = string.Format ("SELECT * FROM PrinterSetting WHERE PrinterId = {0};", ActivePrinterProfile.Instance.ActivePrinter.Id);
			IEnumerable<DataStorage.PrinterSetting> result = (IEnumerable<DataStorage.PrinterSetting>)DataStorage.Datastore.Instance.dbSQLite.Query<DataStorage.PrinterSetting> (query);
			return result;
        }
    }
}