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    /* ---------------------------------------------------------------------
 * Numenta Platform for Intelligent Computing (NuPIC)
 * Copyright (C) 2014, Numenta, Inc.  Unless you have an agreement
 * with Numenta, Inc., for a separate license for this software code, the
 * following terms and conditions apply:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero Public License version 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero Public License for more details.
 *
 * You should have received a copy of the GNU Affero Public License
 * along with this program.  If not, see http://www.gnu.org/licenses.
 *
 * http://numenta.org/licenses/
 * ---------------------------------------------------------------------
 */

package org.numenta.nupic.encoders;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.numenta.nupic.FieldMetaType;
import org.numenta.nupic.Parameters;
import org.numenta.nupic.util.Tuple;

import gnu.trove.map.TIntObjectMap;
import gnu.trove.map.hash.TIntObjectHashMap;

/**
 * A MultiEncoder encodes a dictionary or object with
 * multiple components. A MultiEncode contains a number
 * of sub-encoders, each of which encodes a separate component.
 *
 * @see Encoder
 * @see Encoding
 * @see Parameters
 *
 * @author wlmiller
 */
public class MultiEncoder extends Encoder {
    private static final long serialVersionUID = 1L;

    protected TIntObjectMap indexToCategory = new TIntObjectHashMap();

    protected List categoryList;

    protected int width;
    
    protected static final String CATEGORY_DELIMITER = ";";

    /**
     * Constructs a new {@code MultiEncoder}
     */
    private MultiEncoder() {}

    /**
     * Returns a builder for building MultiEncoders.
     * This builder may be reused to produce multiple builders
     *
     * @return a {@code MultiEncoder.Builder}
     */
    public static Encoder.Builder builder() {
        return new MultiEncoder.Builder();
    }

    public void init() {
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public void setFieldStats(String fieldName, Map fieldStatistics) {
        for (EncoderTuple t : getEncoders(this)) {
            String name = t.getName();
            Encoder encoder = t.getEncoder();
            encoder.setFieldStats(name, fieldStatistics);
        }
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Override
    public void encodeIntoArray(Object input, int[] output) {
        for (EncoderTuple t : getEncoders(this)) {
            String name = t.getName();
            Encoder encoder = t.getEncoder();
            int offset = t.getOffset();

            int[] tempArray = new int[encoder.getWidth()];

            try {
                Object o = getInputValue(input, name);
                encoder.encodeIntoArray(o, tempArray);
            }catch(Exception e) {
                throw new IllegalStateException(e);
            }

            System.arraycopy(tempArray, 0, output, offset, tempArray.length);
        }
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public int[] encodeField(String fieldName, Object value) {
        for (EncoderTuple t : getEncoders(this)) {
            String name = t.getName();
            Encoder encoder = t.getEncoder();

            if (name.equals(fieldName)) {
                return encoder.encode(value);
            }
        }
        return new int[]{};
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List encodeEachField(Object input) {
        List encodings = new ArrayList();

        for (EncoderTuple t : getEncoders(this)) {
            String name = t.getName();
            Encoder encoder = t.getEncoder();

            encodings.add(encoder.encode(getInputValue(input, name)));
        }

        return encodings;
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public void addEncoder(String name, Encoder child) {
        super.addEncoder(this, name, child, width);

        for (Object d : child.getDescription()) {
            Tuple dT = (Tuple) d;
            description.add(new Tuple(dT.get(0), (int)dT.get(1) + getWidth()));
        }
        width += child.getWidth();
    }

    /**
     * Configures this {@code MultiEncoder} using the specified settings map.
     * 
     * @param fieldEncodings
     * @return the assembled {@code MultiEncoder}
     */
    public MultiEncoder addMultipleEncoders(Map> fieldEncodings) {
        return MultiEncoderAssembler.assemble(this, fieldEncodings);
    }
    
    /**
     * Convenience method to return the {@code Encoder} contained within this 
     * {@link MultiEncoder}, of a specific type.
     * @param fmt   the {@link FieldMetaType} specifying the type to return.
     * @return  the Encoder of the specified type or null if one isn't found.
     */
    @SuppressWarnings("unchecked")
    public > T getEncoderOfType(FieldMetaType fmt) {
        Encoder retVal = null;
        for(Tuple t : getEncoders(this)) {
            Encoder enc = (Encoder)t.get(1);
            Set subTypes = enc.getDecoderOutputFieldTypes();
            if(subTypes.contains(fmt)) {
                retVal = enc; break;
            }
        }
        
        return (T)retVal;
    }

    /**
     * Open up for internal Network API use.
     * Returns an {@link Encoder.Builder} which corresponds to the specified name.
     * @param encoderName
     * @return
     */
    public Encoder.Builder getBuilder(String encoderName) {
        switch(encoderName) {
            case "CategoryEncoder":
                return CategoryEncoder.builder();
            case "CoordinateEncoder":
                return CoordinateEncoder.builder();
            case "GeospatialCoordinateEncoder":
                return GeospatialCoordinateEncoder.geobuilder();
            case "LogEncoder":
                return LogEncoder.builder();
            case "PassThroughEncoder":
                return PassThroughEncoder.builder();
            case "ScalarEncoder":
                return ScalarEncoder.builder();
            case "AdaptiveScalarEncoder":
                return AdaptiveScalarEncoder.builder();
            case "SparsePassThroughEncoder":
                return SparsePassThroughEncoder.sparseBuilder();
            case "SDRCategoryEncoder":
                return SDRCategoryEncoder.builder();
            case "RandomDistributedScalarEncoder":
                return RandomDistributedScalarEncoder.builder();
            case "DateEncoder":
                return DateEncoder.builder();
            case "DeltaEncoder":
                return DeltaEncoder.deltaBuilder();
            case "SDRPassThroughEncoder" :
                return SDRPassThroughEncoder.sptBuilder();
            default:
                throw new IllegalArgumentException("Invalid encoder: " + encoderName);
        }
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public void setValue(Encoder.Builder builder, String param, Object value)  {
        switch(param) {
            case "n":
                builder.n(((Number)value).intValue());
                break;
            case "w":
                builder.w(((Number)value).intValue());
                break;
            case "minVal":
                builder.minVal(((Number)value).doubleValue());
                break;
            case "maxVal":
                builder.maxVal(((Number)value).doubleValue());
                break;
            case "radius":
                builder.radius(((Number)value).doubleValue());
                break;
            case "resolution":
                builder.resolution(((Number)value).doubleValue());
                break;
            case "periodic":
                builder.periodic((boolean) value);
                break;
            case "clipInput":
                builder.clipInput((boolean) value);
                break;
            case "forced":
                builder.forced((boolean) value);
                break;
            case "name":
                builder.name((String) value);
                break;
            case "categoryList":
                if(value instanceof String) {
                    String strVal = (String)value;
                    if(strVal.indexOf(CATEGORY_DELIMITER) == -1) {
                        throw new IllegalArgumentException("Category field not delimited with '" + CATEGORY_DELIMITER + "' character.");
                    }
                    value = Arrays.asList(strVal.split("[\\s]*\\" + CATEGORY_DELIMITER + "[\\s]*"));
                }
                if(builder instanceof CategoryEncoder.Builder) {
                    ((CategoryEncoder.Builder) builder).categoryList((List) value);
                }else{
                    ((SDRCategoryEncoder.Builder) builder).categoryList((List) value);
                }
                
                break;
            default:
                throw new IllegalArgumentException("Invalid parameter: " + param);
        }
    }

    @Override
    public int getWidth() {
        return width;
    }

    @Override
    public int getN() {
        return width;
    }

    @Override
    public int getW() {
        return width;
    }

    @Override
    public String getName() {
        if (name == null) return "";
        else return name;
    }

    @Override
    public boolean isDelta() {
        return false;
    }

    @SuppressWarnings("rawtypes")
    @Override
    public void setLearning(boolean learningEnabled) {
        for (EncoderTuple t : getEncoders(this)) {
            Encoder encoder = t.getEncoder();
            encoder.setLearningEnabled(learningEnabled);
        }
    }

    @Override
    public  List getBucketValues(Class returnType) {
        return null;
    }

    /**
     * Returns a {@link EncoderBuilder} for constructing {@link MultiEncoder}s
     *
     * The base class architecture is put together in such a way where boilerplate
     * initialization can be kept to a minimum for implementing subclasses, while avoiding
     * the mistake-proneness of extremely long argument lists.
     *
     */
    public static class Builder extends Encoder.Builder {
        private Builder() {}

        @Override
        public MultiEncoder build() {
            //Must be instantiated so that super class can initialize
            //boilerplate variables.
            encoder = new MultiEncoder();

            //Call super class here
            super.build();

            ////////////////////////////////////////////////////////
            //  Implementing classes would do setting of specific //
            //  vars here together with any sanity checking       //
            ////////////////////////////////////////////////////////

            //Call init
            ((MultiEncoder)encoder).init();

            return (MultiEncoder)encoder;
        }
    }
}
    
    
    
    

    




    
    
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