/*
 * Copyright 2007 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace com.google.zxing.client.result
{

	using BarcodeFormat = com.google.zxing.BarcodeFormat;
	using Result = com.google.zxing.Result;
	using UPCEReader = com.google.zxing.oned.UPCEReader;

	/// <summary>
	/// Parses strings of digits that represent a UPC code.
	/// 
	/// @author dswitkin@google.com (Daniel Switkin)
	/// </summary>
	public sealed class ProductResultParser : ResultParser
	{

	  // Treat all UPC and EAN variants as UPCs, in the sense that they are all product barcodes.
	  public override ParsedResult parse(Result result)
	  {
		BarcodeFormat format = result.BarcodeFormat;
		if (!(format == BarcodeFormat.UPC_A || format == BarcodeFormat.UPC_E || format == BarcodeFormat.EAN_8 || format == BarcodeFormat.EAN_13))
		{
		  return null;
		}
		string rawText = getMassagedText(result);
		int length = rawText.Length;
		for (int x = 0; x < length; x++)
		{
		  char c = rawText[x];
		  if (c < '0' || c > '9')
		  {
			return null;
		  }
		}
		// Not actually checking the checksum again here    

		string normalizedProductID;
		// Expand UPC-E for purposes of searching
		if (format == BarcodeFormat.UPC_E)
		{
		  normalizedProductID = UPCEReader.convertUPCEtoUPCA(rawText);
		}
		else
		{
		  normalizedProductID = rawText;
		}

		return new ProductParsedResult(rawText, normalizedProductID);
	  }

	}
}