//	Spludlow Software
//	Copyright © Samuel P. Ludlow 2020 All Rights Reserved
//	Distributed under the terms of the GNU General Public License version 3
//	Distributed WITHOUT ANY WARRANTY; without implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
//	https://www.spludlow.co.uk/LICENCE.TXT
//	The Spludlow logo is a registered trademark of Samuel P. Ludlow and may not be used without permission
//	v1.14

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

using System.IO;
using System.Data;
using System.Text.RegularExpressions;

namespace Spludlow.MetSat
{
	public class ProductIdentify
	{
		private static Spludlow.Data.IDAL _Database;
		private static Dictionary<string, Regex> _ProductMatches;
		private static Schema.DataProductsDataTable _DataProductsDataTable;

		/// <summary>
		/// Determine a product based on the filename
		/// </summary>
		static ProductIdentify()
		{
			_Database = Spludlow.Data.DAL.Create("@MetSat");

			_ProductMatches = new Dictionary<string, Regex>();

			_DataProductsDataTable = new Schema.DataProductsDataTable();
			_Database.Fill(_DataProductsDataTable, "SELECT * FROM DataProducts");

			foreach (Schema.DataProductsRow row in _DataProductsDataTable.Rows)
			{
				if (row.Match.Length == 0)
					continue;

				_ProductMatches.Add(row.DataProductId, new Regex(row.Match));
			}
		}

		public static string DetermineProduct(string filename)
		{
			string foundProductId = null;

			if (filename.StartsWith("L-") == true || filename.StartsWith("H-") == true)
			{
				if (filename.StartsWith("L-000-MSG3__-MSG3________") == true)   //	FTP LRIT
					return "EO_EUM_DAT_MSG_LRSEVIRI";

				filename = filename.Substring(0, 35);

				foreach (string productId in _ProductMatches.Keys)
				{
					if (_ProductMatches[productId].IsMatch(filename) == true)
					{
						if (foundProductId == null)
							foundProductId = productId;
						else
							throw new ApplicationException("Multiple match for: " + filename);
					}
				}

				if (foundProductId != null)
					return foundProductId;

				return "";
			}

			if (filename.StartsWith("IASI_SST_") == true)   //	FTP	Metop/NOAA Global Data Services	IASI Sea Surface Temperature L2PCore
			{
				return "EO_EUM_DAT_METOP_IASI_SST_";    //	Made Up
			}

			if (filename.StartsWith("S-HSAF-") == true)
			{
				return "S_HSAF_" + filename.Substring(8, 2);
			}

			foreach (string productId in _ProductMatches.Keys)
			{
				if (_ProductMatches[productId].IsMatch(filename) == true)
				{
					if (foundProductId == null)
						foundProductId = productId;
					else
						throw new ApplicationException("Multiple match for: " + filename);
				}
			}

			if (foundProductId != null)
				return foundProductId;


			return "";
		}
	}
}