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

namespace OpenRa.Game.GameRules
{
	static class FieldLoader
	{
		public  static void Load( object self, IniSection ini )
		{
			foreach( var x in ini )
			{
				var field = self.GetType().GetField( x.Key );
				field.SetValue( self, GetValue( field.FieldType, x.Value ) );
			}
		}

		static object GetValue( Type fieldType, string x )
		{
			if( fieldType == typeof( int ) )
				return int.Parse( x );

			else if( fieldType == typeof( float ) )
				return float.Parse( x );

			else if( fieldType == typeof( string ) )
				return x;//.ToLowerInvariant();

			else if( fieldType.IsEnum )
				return Enum.Parse( fieldType, x );

			else if( fieldType == typeof( bool ) )
				return ParseYesNo( x );

			else if( fieldType.IsArray )
			{
				var parts = x.Split( new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries );

				var ret = Array.CreateInstance( fieldType.GetElementType(), parts.Length );
				for( int i = 0 ; i < parts.Length ; i++ )
					ret.SetValue( GetValue( fieldType.GetElementType(), parts[ i ].Trim() ), i );
				return ret;
			}
			else if( fieldType == typeof( int2 ) )
			{
				var parts = x.Split( new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries );
				return new int2( int.Parse( parts[ 0 ] ), int.Parse( parts[ 1 ] ) );
			}
			else
				throw new InvalidOperationException( "FieldLoader: don't know how to load field of type " + fieldType.ToString() );
		}

		static bool ParseYesNo( string p )
		{
			p = p.ToLowerInvariant();
			if( p == "yes" ) return true;
			if( p == "true" ) return true;
			if( p == "no" ) return false;
			if( p == "false" ) return false;
			throw new InvalidOperationException();
		}
	}
}