#region ================== Namespaces

using System;
using System.Collections.Generic;
using CodeImp.DoomBuilder.Map;
using System.Windows.Forms;

#endregion

namespace CodeImp.DoomBuilder.BuilderModes
{
	[FindReplace("Sector Brightness", BrowseButton = false)]
	internal class FindSectorBrightness : BaseFindSector
	{
		#region ================== Properties

		//mxd. Prefixes usage
		public override string UsageHint { get { return "Supported prefixes:" + Environment.NewLine
													+ "\"<=\" - finds values less or equal to given value;" + Environment.NewLine
													+ "\">=\" - finds values greater or equal to given value;" + Environment.NewLine
													+ "\"<\" - finds values less than given value;" + Environment.NewLine
													+ "\">\" - finds values greater than given value."; } }

		#endregion

		#region ================== Methods

		// This is called to perform a search (and replace)
		// Returns a list of items to show in the results list
		// replacewith is null when not replacing
		public override FindReplaceObject[] Find(string value, bool withinselection, bool replace, string replacewith, bool keepselection) 
		{
			List<FindReplaceObject> objs = new List<FindReplaceObject>();

			// Interpret the replacement
			int replacebrightness = 0;
			if(replace) 
			{
				// If it cannot be interpreted, set replacewith to null (not replacing at all)
				if(!int.TryParse(replacewith, out replacebrightness)) replacewith = null;
				if(replacebrightness < 0) replacewith = null;
				if(replacebrightness > 255) replacewith = null;
				if(replacewith == null) 
				{
					MessageBox.Show("Invalid replace value for this search type!", "Find and Replace", MessageBoxButtons.OK, MessageBoxIcon.Error);
					return objs.ToArray();
				}
			}

			// Interpret the number given
			int brightness;
			string prefix = string.Empty; //mxd

			//mxd. Check prefixes
			value = value.Trim().Replace(" ", "");
			if(value.StartsWith(">=") || value.StartsWith("<=")) prefix = value.Substring(0, 2);
			else if(value.StartsWith(">") || value.StartsWith("<")) prefix = value.Substring(0, 1);
			value = value.Remove(0, prefix.Length);

			if(int.TryParse(value, out brightness)) 
			{
				// Where to search?
				ICollection<Sector> list = withinselection ? General.Map.Map.GetSelectedSectors(true) : General.Map.Map.Sectors;

				// Go for all sectors
				foreach(Sector s in list) 
				{
					// Brightness matches?
					if(BrightnessMatches(s.Brightness, brightness, prefix)) 
					{
						// Replace
						if(replace) s.Brightness = replacebrightness;

						objs.Add(new FindReplaceObject(s, "Sector " + s.Index + (!replace ? " (Brightness " + s.Brightness + ")" : "")));
					}
				}
			}

			//refresh map
			if(replace) 
			{
				General.Map.Map.Update();
				General.Map.IsChanged = true;
			}

			return objs.ToArray();
		}

		//mxd
		private static bool BrightnessMatches(int sectorbrightness, int brightness, string prefix)
		{
			switch(prefix)
			{
				case "": return sectorbrightness == brightness;
				case "<=": return sectorbrightness <= brightness;
				case ">=": return sectorbrightness >= brightness;
				case "<": return sectorbrightness < brightness;
				case ">": return sectorbrightness > brightness;
				default: throw new NotImplementedException("Unknown prefix");
			}
		}

		#endregion

	}
}