/*
 * 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 com.google.zxing.client.android;

import android.content.Intent;

import com.google.zxing.BarcodeFormat;

import java.util.Arrays;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

public final class DecodeFormatManager {

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

    static final Set<BarcodeFormat> PRODUCT_FORMATS;
    static final Set<BarcodeFormat> INDUSTRIAL_FORMATS;
    private static final Set<BarcodeFormat> ONE_D_FORMATS;
    static final Set<BarcodeFormat> QR_CODE_FORMATS = EnumSet.of(BarcodeFormat.QR_CODE);
    static final Set<BarcodeFormat> DATA_MATRIX_FORMATS = EnumSet.of(BarcodeFormat.DATA_MATRIX);
    static final Set<BarcodeFormat> AZTEC_FORMATS = EnumSet.of(BarcodeFormat.AZTEC);
    static final Set<BarcodeFormat> PDF417_FORMATS = EnumSet.of(BarcodeFormat.PDF_417);

    static {
        PRODUCT_FORMATS = EnumSet.of(BarcodeFormat.UPC_A,
                BarcodeFormat.UPC_E,
                BarcodeFormat.EAN_13,
                BarcodeFormat.EAN_8,
                BarcodeFormat.RSS_14,
                BarcodeFormat.RSS_EXPANDED);
        INDUSTRIAL_FORMATS = EnumSet.of(BarcodeFormat.CODE_39,
                BarcodeFormat.CODE_93,
                BarcodeFormat.CODE_128,
                BarcodeFormat.ITF,
                BarcodeFormat.CODABAR);
        ONE_D_FORMATS = EnumSet.copyOf(PRODUCT_FORMATS);
        ONE_D_FORMATS.addAll(INDUSTRIAL_FORMATS);
    }

    private static final Map<String, Set<BarcodeFormat>> FORMATS_FOR_MODE;

    static {
        FORMATS_FOR_MODE = new HashMap<>();
        FORMATS_FOR_MODE.put(Intents.Scan.ONE_D_MODE, ONE_D_FORMATS);
        FORMATS_FOR_MODE.put(Intents.Scan.PRODUCT_MODE, PRODUCT_FORMATS);
        FORMATS_FOR_MODE.put(Intents.Scan.QR_CODE_MODE, QR_CODE_FORMATS);
        FORMATS_FOR_MODE.put(Intents.Scan.DATA_MATRIX_MODE, DATA_MATRIX_FORMATS);
        FORMATS_FOR_MODE.put(Intents.Scan.AZTEC_MODE, AZTEC_FORMATS);
        FORMATS_FOR_MODE.put(Intents.Scan.PDF417_MODE, PDF417_FORMATS);
    }

    private DecodeFormatManager() {
    }

    public static Set<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));
    }

    private static Set<BarcodeFormat> parseDecodeFormats(Iterable<String> scanFormats, String decodeMode) {
        if (scanFormats != null) {
            Set<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) {
            return FORMATS_FOR_MODE.get(decodeMode);
        }
        return null;
    }
}
