/*
 * $RCSfile: CBlkSizeSpec.java,v $
 * $Revision: 1.1 $
 * $Date: 2005/02/11 05:02:04 $
 * $State: Exp $
 *
 * Class:                   CBlkSizeSpec
 *
 * Description:             Specification of the code-blocks size
 *
 *
 *
 * COPYRIGHT:
 *
 * This software module was originally developed by Raphaël Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
 * Centre France S.A) in the course of development of the JPEG2000
 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
 * software module is an implementation of a part of the JPEG 2000
 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
 * Partners) agree not to assert against ISO/IEC and users of the JPEG
 * 2000 Standard (Users) any of their rights under the copyright, not
 * including other intellectual property rights, for this software module
 * with respect to the usage by ISO/IEC and Users of this software module
 * or modifications thereof for use in hardware or software products
 * claiming conformance to the JPEG 2000 Standard. Those intending to use
 * this software module in hardware or software products are advised that
 * their use may infringe existing patents. The original developers of
 * this software module, JJ2000 Partners and ISO/IEC assume no liability
 * for use of this software module or modifications thereof. No license
 * or right to this software module is granted for non JPEG 2000 Standard
 * conforming products. JJ2000 Partners have full right to use this
 * software module for his/her own purpose, assign or donate this
 * software module to any third party and to inhibit third parties from
 * using this software module for non JPEG 2000 Standard conforming
 * products. This copyright notice must be included in all copies or
 * derivative works of this software module.
 *
 * Copyright (c) 1999/2000 JJ2000 Partners.
 * */
package jj2000.j2k.entropy;

import java.util.NoSuchElementException;
import java.util.StringTokenizer;

import jj2000.j2k.ModuleSpec;
import jj2000.j2k.util.MathUtil;

import com.github.jaiimageio.jpeg2000.impl.J2KImageWriteParamJava;
/**
 * This class extends ModuleSpec class for code-blocks sizes holding purposes.
 *
 * <P>It stores the size a of code-block.
 * */
public class CBlkSizeSpec extends ModuleSpec {

    private String defaultValue = "64 64";

    /** Name of the option */
    private static final String optName = "Cblksiz";

    /** The maximum code-block width */
    private int maxCBlkWidth = 0;

    /** The maximum code-block height */
    private int maxCBlkHeight = 0;

    /**
     * Creates a new CBlkSizeSpec object for the specified number of tiles and
     * components.
     *
     * @param nt The number of tiles
     *
     * @param nc The number of components
     *
     * @param type the type of the specification module i.e. tile specific,
     * component specific or both.
     * */
    public CBlkSizeSpec(int nt, int nc, byte type) {
        super(nt, nc, type);
    }

    /**
     * Creates a new CBlkSizeSpec object for the specified number of tiles and
     * components and the ParameterList instance.
     *
     * @param nt The number of tiles
     *
     * @param nc The number of components
     *
     * @param type the type of the specification module i.e. tile specific,
     * component specific or both.
     *
     * @param imgsrc The image source (used to get the image size)
     *
     * @param pl The ParameterList instance
     * */
    public CBlkSizeSpec(int nt, int nc, byte type, J2KImageWriteParamJava wp, String values) {
        super(nt, nc, type);

        boolean firstVal = true;
        specified = values;

        String param = values; //"64 64";
        if (param == null)
            param = defaultValue;    // the default
        //pl.getParameter(optName);

        // Precinct partition is used : parse arguments
        StringTokenizer stk = new StringTokenizer(param);
        byte curSpecType = SPEC_DEF; // Specification type of the
                                     // current parameter
        boolean[] tileSpec = null; // Tiles concerned by the specification
        boolean[] compSpec = null; // Components concerned by the specification
        int i, xIdx, ci, ti;
        String word = null; // current word
        String errMsg = null;

        while( stk.hasMoreTokens() ) {
            word = stk.nextToken();

            switch(word.charAt(0)){

            case 't': // Tiles specification
                tileSpec = parseIdx(word, nTiles);
                if(curSpecType==SPEC_COMP_DEF) {
                    curSpecType = SPEC_TILE_COMP;
                }
                else {
                    curSpecType = SPEC_TILE_DEF;
                }
                break;

            case 'c': // Components specification
                compSpec = parseIdx(word, nComp);
                if(curSpecType==SPEC_TILE_DEF) {
                    curSpecType = SPEC_TILE_COMP;
                }
                else {
                    curSpecType = SPEC_COMP_DEF;
                }
                break;

            default:
                if ( !Character.isDigit(word.charAt(0)) ) {
                    errMsg = "Bad construction for parameter: "+word;
                    throw new IllegalArgumentException(errMsg);
                }
                Integer dim[] = new Integer[2];
                // Get code-block's width
                try {
                    dim[0] = new Integer(word);
                    // Check that width is not >
                    // StdEntropyCoderOptions.MAX_CB_DIM
                    if( dim[0].intValue()>StdEntropyCoderOptions.MAX_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "width cannot be greater than "+
                            StdEntropyCoderOptions.MAX_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that width is not <
                    // StdEntropyCoderOptions.MIN_CB_DIM
                    if( dim[0].intValue()<StdEntropyCoderOptions.MIN_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "width cannot be less than "+
                            StdEntropyCoderOptions.MIN_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that width is a power of 2
                    if ( dim[0].intValue() !=
                         (1<<MathUtil.log2(dim[0].intValue())) ) {
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "width must be a power of 2";
                        throw new IllegalArgumentException(errMsg);
                    }
                }
                catch( NumberFormatException e) {
                     errMsg = "'"+optName+"' option : the code-block's "+
                         "width could not be parsed.";
                    throw new IllegalArgumentException(errMsg);
                }
                // Get the next word in option
                try {
                    word = stk.nextToken();
                }
                catch (NoSuchElementException e) {
                    errMsg = "'"+optName+"' option : could not parse the "+
                        "code-block's height";
                    throw new IllegalArgumentException(errMsg);

                }
                // Get the code-block's height
                try {
                    dim[1] = new Integer(word);
                    // Check that height is not >
                    // StdEntropyCoderOptions.MAX_CB_DIM
                    if ( dim[1].intValue()>StdEntropyCoderOptions.MAX_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "height cannot be greater than "+
                            StdEntropyCoderOptions.MAX_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that height is not <
                    // StdEntropyCoderOptions.MIN_CB_DIM
                    if ( dim[1].intValue()<StdEntropyCoderOptions.MIN_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "height cannot be less than "+
                            StdEntropyCoderOptions.MIN_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that height is a power of 2
                    if ( dim[1].intValue() !=
                         (1<<MathUtil.log2(dim[1].intValue())) ) {
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "height must be a power of 2";
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that the code-block 'area' (i.e. width*height) is
                    // not greater than StdEntropyCoderOptions.MAX_CB_AREA
                    if ( dim[0].intValue()*dim[1].intValue() >
                         StdEntropyCoderOptions.MAX_CB_AREA )
                        {
                            errMsg = "'"+optName+"' option : The "+
                                "code-block's area (i.e. width*height) "+
                                "cannot be greater than "+
                                StdEntropyCoderOptions.MAX_CB_AREA;
                            throw new IllegalArgumentException(errMsg);
                        }
                }
                catch( NumberFormatException e) {
                    errMsg = "'"+optName+"' option : the code-block's height "+
                        "could not be parsed.";
                    throw new IllegalArgumentException(errMsg);
                }

                // Store the maximum dimensions if necessary
                if ( dim[0].intValue() > maxCBlkWidth ) {
                    maxCBlkWidth = dim[0].intValue();
                }

                if ( dim[1].intValue() > maxCBlkHeight ) {
                    maxCBlkHeight = dim[1].intValue();
                }

                if ( firstVal ) {
                    // This is the first time a value is given so we set it as
                    // the default one
                    setDefault(dim);
                    firstVal = false;
                }

                switch (curSpecType) {
                case  SPEC_DEF:
                    setDefault(dim);
                    break;
                case SPEC_TILE_DEF:
                    for(ti=tileSpec.length-1; ti>=0; ti--) {
                        if( tileSpec[ti] ){
                            setTileDef(ti,dim);
                        }
                    }
                    break;
                case SPEC_COMP_DEF:
                    for(ci=compSpec.length-1; ci>=0; ci--) {
                        if( compSpec[ci] ){
                            setCompDef(ci,dim);
                        }
                    }
                    break;
                default:
                    for(ti=tileSpec.length-1; ti>=0; ti--){
                        for(ci=compSpec.length-1; ci>=0 ; ci--){
                            if(tileSpec[ti] && compSpec[ci]){
                                setTileCompVal(ti,ci,dim);
                            }
                        }
                    }
                    break;
                }
            } // end switch
        }
    }

    /**
     * Returns the maximum code-block's width
     *
     */
    public int getMaxCBlkWidth() {
        return maxCBlkWidth;
    }

    /**
     * Returns the maximum code-block's height
     *
     */
    public int getMaxCBlkHeight() {
        return maxCBlkHeight;
    }

    /**
     * Returns the code-block width :
     *
     * <ul>
     * <li>for the specified tile/component</li>
     * <li>for the specified tile</li>
     * <li>for the specified component</li>
     * <li>default value</li>
     * </ul>
     *
     * The value returned depends on the value of the variable 'type' which
     * can take the following values :<br>
     *
     * <ul>
     * <li>SPEC_DEF -> Default value is returned. t and c values are
     * ignored</li>
     * <li>SPEC_COMP_DEF -> Component default value is returned. t value is
     * ignored</li>
     * <li>SPEC_TILE_DEF -> Tile default value is returned. c value is
     * ignored</li>
     * <li>SPEC_TILE_COMP -> Tile/Component value is returned.</li>
     * </ul>
     *
     * @param type The type of the value we want to be returned
     *
     * @param t The tile index
     *
     * @param c the component index
     *
     * @return The code-block width for the specified tile and component
     * */
    public int getCBlkWidth(byte type, int t, int c) {
        Integer dim[] = null;
        switch (type) {
        case SPEC_DEF:
            dim = (Integer[])getDefault();
            break;
        case SPEC_COMP_DEF:
            dim = (Integer[])getCompDef(c);
            break;
        case SPEC_TILE_DEF:
            dim = (Integer[])getTileDef(t);
            break;
        case SPEC_TILE_COMP:
            dim = (Integer[])getTileCompVal(t, c);
        }
        return dim[0].intValue();
    }

    /**
     * Returns the code-block height:
     *
     * <ul>
     * <li>for the specified tile/component</li>
     * <li>for the specified tile</li>
     * <li>for the specified component</li>
     * <li>default value</li>
     * </ul>
     *
     * The value returned depends on the value of the variable 'type' which
     * can take the following values :
     *
     * <ul>
     * <li>SPEC_DEF -> Default value is returned. t and c values are
     * ignored</li>
     * <li>SPEC_COMP_DEF -> Component default value is returned. t value is
     * ignored</li>
     * <li>SPEC_TILE_DEF -> Tile default value is returned. c value is
     * ignored</li>
     * <li>SPEC_TILE_COMP -> Tile/Component value is returned.</li>
     * </ul>
     *
     * @param type The type of the value we want to be returned
     *
     * @param t The tile index
     *
     * @param c the component index
     *
     * @return The code-block height for the specified tile and component
     * */
    public int getCBlkHeight(byte type, int t, int c) {
        Integer dim[] = null;
        switch (type) {
        case SPEC_DEF:
            dim = (Integer[])getDefault();
            break;
        case SPEC_COMP_DEF:
            dim = (Integer[])getCompDef(c);
            break;
        case SPEC_TILE_DEF:
            dim = (Integer[])getTileDef(t);
            break;
        case SPEC_TILE_COMP:
            dim = (Integer[])getTileCompVal(t, c);
        }
        return dim[1].intValue();
    }

    /**
     * Sets default value for this module
     *
     * @param value Default value
     * */
    public void setDefault(Object value){
        super.setDefault(value);

        // Store the biggest code-block dimensions
        storeHighestDims((Integer[])value);
    }

    /**
     * Sets default value for specified tile and specValType tag if allowed by
     * its priority.
     *
     * @param c Tile index.
     *
     * @param value Tile's default value
     *  */
    public void setTileDef(int t, Object value){
        super.setTileDef(t, value);

        // Store the biggest code-block dimensions
        storeHighestDims((Integer[])value);
    }

    /**
     * Sets default value for specified component and specValType tag if
     * allowed by its priority.
     *
     * @param c Component index
     *
     * @param value Component's default value
     *  */
    public void setCompDef(int c, Object value){
        super.setCompDef(c, value);

        // Store the biggest code-block dimensions
        storeHighestDims((Integer[])value);
    }

    /**
     * Sets value for specified tile-component.
     *
     * @param t Tie index
     *
     * @param c Component index
     *
     * @param value Tile-component's value
     *  */
    public void setTileCompVal(int t,int c, Object value){
        super.setTileCompVal(t, c, value);

        // Store the biggest code-block dimensions
        storeHighestDims((Integer[])value);
    }

    /**
     * Stores the highest code-block width and height
     *
     * @param dim The 2 elements array that contains the code-block width and
     * height.
     *  */
    private void storeHighestDims(Integer[] dim){
        // Store the biggest code-block dimensions
        if ( dim[0].intValue() > maxCBlkWidth ) {
            maxCBlkWidth = dim[0].intValue();
        }
        if ( dim[1].intValue() > maxCBlkHeight ) {
            maxCBlkHeight = dim[1].intValue();
        }
    }
}