/*
 * Copyright (C) 2010 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.
 */

package cn.jymf.scan.decode;

import java.util.Arrays;
import java.util.Collection;
import java.util.EnumSet;
import java.util.List;
import java.util.regex.Pattern;

import android.content.Intent;
import android.net.Uri;
import cn.jymf.scan.Intents;

import com.google.zxing.BarcodeFormat;

final class DecodeFormatManager {

	private static final Pattern COMMA_PATTERN = Pattern.compile(",");

	static final Collection<BarcodeFormat> PRODUCT_FORMATS;
	static final Collection<BarcodeFormat> ONE_D_FORMATS;
	static final Collection<BarcodeFormat> QR_CODE_FORMATS = EnumSet
			.of(BarcodeFormat.QR_CODE);
	static final Collection<BarcodeFormat> DATA_MATRIX_FORMATS = EnumSet
			.of(BarcodeFormat.DATA_MATRIX);
	static {
		PRODUCT_FORMATS = EnumSet.of(BarcodeFormat.UPC_A, BarcodeFormat.UPC_E,
				BarcodeFormat.EAN_13, BarcodeFormat.EAN_8,
				BarcodeFormat.RSS_14, BarcodeFormat.RSS_EXPANDED);
		ONE_D_FORMATS = EnumSet.of(BarcodeFormat.CODE_39,
				BarcodeFormat.CODE_93, BarcodeFormat.CODE_128,
				BarcodeFormat.ITF, BarcodeFormat.CODABAR);
		ONE_D_FORMATS.addAll(PRODUCT_FORMATS);
	}

	private DecodeFormatManager() {
	}

	static Collection<BarcodeFormat> parseDecodeFormats(Intent intent) {
		Iterable<String> scanFormats = null;
		CharSequence scanFormatsString = intent
				.getStringExtra(Intents.Scan.FORMATS);
		if (scanFormatsString != null) {
			scanFormats = Arrays.asList(COMMA_PATTERN.split(scanFormatsString));
		}
		return parseDecodeFormats(scanFormats,
				intent.getStringExtra(Intents.Scan.MODE));
	}

	static Collection<BarcodeFormat> parseDecodeFormats(Uri inputUri) {
		List<String> formats = inputUri
				.getQueryParameters(Intents.Scan.FORMATS);
		if (formats != null && formats.size() == 1 && formats.get(0) != null) {
			formats = Arrays.asList(COMMA_PATTERN.split(formats.get(0)));
		}
		return parseDecodeFormats(formats,
				inputUri.getQueryParameter(Intents.Scan.MODE));
	}

	private static Collection<BarcodeFormat> parseDecodeFormats(
			Iterable<String> scanFormats, String decodeMode) {
		if (scanFormats != null) {
			Collection<BarcodeFormat> formats = EnumSet
					.noneOf(BarcodeFormat.class);
			try {
				for (String format : scanFormats) {
					formats.add(BarcodeFormat.valueOf(format));
				}
				return formats;
			}
			catch (IllegalArgumentException iae) {
				// ignore it then
			}
		}
		if (decodeMode != null) {
			if (Intents.Scan.PRODUCT_MODE.equals(decodeMode)) {
				return PRODUCT_FORMATS;
			}
			if (Intents.Scan.QR_CODE_MODE.equals(decodeMode)) {
				return QR_CODE_FORMATS;
			}
			if (Intents.Scan.DATA_MATRIX_MODE.equals(decodeMode)) {
				return DATA_MATRIX_FORMATS;
			}
			if (Intents.Scan.ONE_D_MODE.equals(decodeMode)) {
				return ONE_D_FORMATS;
			}
		}
		return null;
	}

}
