using System;
/*
 * 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 iTextSharp.text.pdf.qrcode {

    /**
     * <p>See ISO 18004:2006, 6.5.1. This enum encapsulates the four error correction levels
     * defined by the QR code standard.</p>
     *
     * @author Sean Owen
     */
    public sealed class ErrorCorrectionLevel {

        /**
         * L = ~7% correction
         */
        public static readonly ErrorCorrectionLevel L = new ErrorCorrectionLevel(0, 0x01, "L");
        /**
         * M = ~15% correction
         */
        public static readonly ErrorCorrectionLevel M = new ErrorCorrectionLevel(1, 0x00, "M");
        /**
         * Q = ~25% correction
         */
        public static readonly ErrorCorrectionLevel Q = new ErrorCorrectionLevel(2, 0x03, "Q");
        /**
         * H = ~30% correction
         */
        public static readonly ErrorCorrectionLevel H = new ErrorCorrectionLevel(3, 0x02, "H");

        private static readonly ErrorCorrectionLevel[] FOR_BITS = { M, L, H, Q };

        private int ordinal;
        private int bits;
        private String name;

        private ErrorCorrectionLevel(int ordinal, int bits, String name) {
            this.ordinal = ordinal;
            this.bits = bits;
            this.name = name;
        }

        public int Ordinal() {
            return ordinal;
        }

        public int GetBits() {
            return bits;
        }

        public String GetName() {
            return name;
        }

        public override String ToString() {
            return name;
        }

        /**
         * @param bits int containing the two bits encoding a QR Code's error correction level
         * @return {@link ErrorCorrectionLevel} representing the encoded error correction level
         */
        public static ErrorCorrectionLevel ForBits(int bits) {
            if (bits < 0 || bits >= FOR_BITS.Length) {
                throw new IndexOutOfRangeException();
            }
            return FOR_BITS[bits];
        }
    }
}