//	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;

namespace Spludlow.MetSat
{
	/// <summary>
	/// Front end code for http://metsat.spludlow.co.uk/
	/// </summary>
	public class WebImagesFront
	{
		public static string _ImageRootDirectory = Spludlow.Config.Get("MetSatWeb.FilePath");
		public static string _ImageRootUrl = Spludlow.Config.Get("MetSatWeb.WebPath");

		/// <summary>
		/// Get thumb and target urls for product
		/// </summary>
		public static DataTable ProductImagesTable(string product, string targetExtention, int maxCount, int maxTargetCount)
		{
			string find = ".thumb960.jpg";

			string[] sampleFilenames = GetDescendingFilenames(product, "*" + find, maxCount);

			DataTable table = Spludlow.Data.TextTable.ReadText(new string[]
			{
				"Thumb960	Thumb480	Target	Title",
				"String		String		String	String",
			});

			foreach (string sampleFilename in sampleFilenames)
			{
				string name = sampleFilename.Substring(0, sampleFilename.Length - find.Length);

				string targetFilename = name + targetExtention;
				string thumb480Filename = name + ".thumb480.jpg";
				string thumb960Filename = name + ".thumb960.jpg";

				string thumb480Url = MapUrl(thumb480Filename);
				string thumb960Url = MapUrl(thumb960Filename);

				string targetUrl = "";
				if (table.Rows.Count < maxTargetCount)
					targetUrl = MapUrl(targetFilename);

				string title = Path.GetFileName(name).Replace("-", " - ");

				table.Rows.Add(thumb960Url, thumb480Url, targetUrl, title);
			}

			return table;
		}

		/// <summary>
		/// Map a filesystem filename into a web url
		/// </summary>
		public static string MapUrl(string filename)
		{
			string name = filename.Substring(_ImageRootDirectory.Length + 1);

			return _ImageRootUrl + name.Replace(@"\", "/");
		}

		/// <summary>
		/// List a product directory
		/// </summary>
		public static string[] GetDescendingFilenames(string product, string pattern, int count)
		{
			string directory = _ImageRootDirectory + @"\" + product;

			if (Directory.Exists(directory) == false)
				return new string[0];

			List<string> filenames = new List<string>(Directory.GetFiles(directory, pattern));
			filenames.Sort();

			List<string> descending = new List<string>();

			for (int index = filenames.Count - 1; index >= 0; --index)
			{
				descending.Add(filenames[index]);

				if (descending.Count == count)
					break;
			}

			return descending.ToArray();
		}

		/// <summary>
		/// Set the image and target url of HyperLink to latest product image and thumbnail
		/// </summary>
		public static void SetLinkImage(System.Web.UI.WebControls.HyperLink hyperLink, string product, int size)
		{
			DataTable table = ProductImagesTable(product, ".dat", 1, 1);
			if (table.Rows.Count == 0)
				return;

			DataRow row = table.Rows[0];

			hyperLink.ImageUrl = (string)row["Thumb" + size];
			hyperLink.ToolTip = (string)row["Title"];
		}


	}
}