/*
 * Copyright 2006 Jeremias Maerki
 *
 * 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.datamatrix.encoder;

import com.google.zxing.Dimension;

/**
 * Symbol info table for DataMatrix.
 *
 * @version $Id$
 */
public class SymbolInfo {

  static final SymbolInfo[] PROD_SYMBOLS = {
    new SymbolInfo(false, 3, 5, 8, 8, 1),
    new SymbolInfo(false, 5, 7, 10, 10, 1),
      /*rect*/new SymbolInfo(true, 5, 7, 16, 6, 1),
    new SymbolInfo(false, 8, 10, 12, 12, 1),
      /*rect*/new SymbolInfo(true, 10, 11, 14, 6, 2),
    new SymbolInfo(false, 12, 12, 14, 14, 1),
      /*rect*/new SymbolInfo(true, 16, 14, 24, 10, 1),

    new SymbolInfo(false, 18, 14, 16, 16, 1),
    new SymbolInfo(false, 22, 18, 18, 18, 1),
      /*rect*/new SymbolInfo(true, 22, 18, 16, 10, 2),
    new SymbolInfo(false, 30, 20, 20, 20, 1),
      /*rect*/new SymbolInfo(true, 32, 24, 16, 14, 2),
    new SymbolInfo(false, 36, 24, 22, 22, 1),
    new SymbolInfo(false, 44, 28, 24, 24, 1),
      /*rect*/new SymbolInfo(true, 49, 28, 22, 14, 2),

    new SymbolInfo(false, 62, 36, 14, 14, 4),
    new SymbolInfo(false, 86, 42, 16, 16, 4),
    new SymbolInfo(false, 114, 48, 18, 18, 4),
    new SymbolInfo(false, 144, 56, 20, 20, 4),
    new SymbolInfo(false, 174, 68, 22, 22, 4),

    new SymbolInfo(false, 204, 84, 24, 24, 4, 102, 42),
    new SymbolInfo(false, 280, 112, 14, 14, 16, 140, 56),
    new SymbolInfo(false, 368, 144, 16, 16, 16, 92, 36),
    new SymbolInfo(false, 456, 192, 18, 18, 16, 114, 48),
    new SymbolInfo(false, 576, 224, 20, 20, 16, 144, 56),
    new SymbolInfo(false, 696, 272, 22, 22, 16, 174, 68),
    new SymbolInfo(false, 816, 336, 24, 24, 16, 136, 56),
    new SymbolInfo(false, 1050, 408, 18, 18, 36, 175, 68),
    new SymbolInfo(false, 1304, 496, 20, 20, 36, 163, 62),
    new DataMatrixSymbolInfo144(),
  };

  private static SymbolInfo[] symbols = PROD_SYMBOLS;

  private final boolean rectangular;
  private final int dataCapacity;
  private final int errorCodewords;
  public final int matrixWidth;
  public final int matrixHeight;
  private final int dataRegions;
  private final int rsBlockData;
  private final int rsBlockError;

  /**
   * Overrides the symbol info set used by this class. Used for testing purposes.
   *
   * @param override the symbol info set to use
   */
  public static void overrideSymbolSet(SymbolInfo[] override) {
    symbols = override;
  }

  public SymbolInfo(boolean rectangular, int dataCapacity, int errorCodewords,
                    int matrixWidth, int matrixHeight, int dataRegions) {
    this(rectangular, dataCapacity, errorCodewords, matrixWidth, matrixHeight, dataRegions,
         dataCapacity, errorCodewords);
  }

  SymbolInfo(boolean rectangular, int dataCapacity, int errorCodewords,
             int matrixWidth, int matrixHeight, int dataRegions,
             int rsBlockData, int rsBlockError) {
    this.rectangular = rectangular;
    this.dataCapacity = dataCapacity;
    this.errorCodewords = errorCodewords;
    this.matrixWidth = matrixWidth;
    this.matrixHeight = matrixHeight;
    this.dataRegions = dataRegions;
    this.rsBlockData = rsBlockData;
    this.rsBlockError = rsBlockError;
  }

  public static SymbolInfo lookup(int dataCodewords) {
    return lookup(dataCodewords, SymbolShapeHint.FORCE_NONE, true);
  }

  public static SymbolInfo lookup(int dataCodewords, SymbolShapeHint shape) {
    return lookup(dataCodewords, shape, true);
  }

  public static SymbolInfo lookup(int dataCodewords, boolean allowRectangular, boolean fail) {
    SymbolShapeHint shape = allowRectangular
        ? SymbolShapeHint.FORCE_NONE : SymbolShapeHint.FORCE_SQUARE;
    return lookup(dataCodewords, shape, fail);
  }

  private static SymbolInfo lookup(int dataCodewords, SymbolShapeHint shape, boolean fail) {
    return lookup(dataCodewords, shape, null, null, fail);
  }

  public static SymbolInfo lookup(int dataCodewords,
                                  SymbolShapeHint shape,
                                  Dimension minSize,
                                  Dimension maxSize,
                                  boolean fail) {
    for (SymbolInfo symbol : symbols) {
      if (shape == SymbolShapeHint.FORCE_SQUARE && symbol.rectangular) {
        continue;
      }
      if (shape == SymbolShapeHint.FORCE_RECTANGLE && !symbol.rectangular) {
        continue;
      }
      if (minSize != null
          && (symbol.getSymbolWidth() < minSize.getWidth()
          || symbol.getSymbolHeight() < minSize.getHeight())) {
        continue;
      }
      if (maxSize != null
          && (symbol.getSymbolWidth() > maxSize.getWidth()
          || symbol.getSymbolHeight() > maxSize.getHeight())) {
        continue;
      }
      if (dataCodewords <= symbol.dataCapacity) {
        return symbol;
      }
    }
    if (fail) {
      throw new IllegalArgumentException(
          "Can't find a symbol arrangement that matches the message. Data codewords: "
              + dataCodewords);
    }
    return null;
  }

  private int getHorizontalDataRegions() {
    switch (dataRegions) {
      case 1:
        return 1;
      case 2:
      case 4:
        return 2;
      case 16:
        return 4;
      case 36:
        return 6;
      default:
        throw new IllegalStateException("Cannot handle this number of data regions");
    }
  }

  private int getVerticalDataRegions() {
    switch (dataRegions) {
      case 1:
      case 2:
        return 1;
      case 4:
        return 2;
      case 16:
        return 4;
      case 36:
        return 6;
      default:
        throw new IllegalStateException("Cannot handle this number of data regions");
    }
  }

  public final int getSymbolDataWidth() {
    return getHorizontalDataRegions() * matrixWidth;
  }

  public final int getSymbolDataHeight() {
    return getVerticalDataRegions() * matrixHeight;
  }

  public final int getSymbolWidth() {
    return getSymbolDataWidth() + (getHorizontalDataRegions() * 2);
  }

  public final int getSymbolHeight() {
    return getSymbolDataHeight() + (getVerticalDataRegions() * 2);
  }

  public int getCodewordCount() {
    return dataCapacity + errorCodewords;
  }

  public int getInterleavedBlockCount() {
    return dataCapacity / rsBlockData;
  }

  public final int getDataCapacity() {
    return dataCapacity;
  }

  public final int getErrorCodewords() {
    return errorCodewords;
  }

  public int getDataLengthForInterleavedBlock(int index) {
    return rsBlockData;
  }

  public final int getErrorLengthForInterleavedBlock(int index) {
    return rsBlockError;
  }

  @Override
  public final String toString() {
    return (rectangular ? "Rectangular Symbol:" : "Square Symbol:") +
        " data region " + matrixWidth + 'x' + matrixHeight +
        ", symbol size " + getSymbolWidth() + 'x' + getSymbolHeight() +
        ", symbol data size " + getSymbolDataWidth() + 'x' + getSymbolDataHeight() +
        ", codewords " + dataCapacity + '+' + errorCodewords;
  }

}
