package org.autoplot.metatree;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.logging.Logger;
import java.util.regex.Pattern;
import org.autoplot.datasource.LogNames;
import org.das2.qds.DataSetOps;
import org.das2.qds.DataSetUtil;
import org.das2.qds.QDataSet;
import org.autoplot.datasource.MetadataModel;
import org.das2.datum.LoggerManager;
import org.w3c.dom.Node;

/**
 *
 * @author jbf
 */
public class MetadataUtil {

    private static final Logger logger= LoggerManager.getLogger(LogNames.APDSS);
    /**
     * converts tree model node into canonical Map<String,Object>.  Branch nodes
     * are HashMap<String,Object> as well.
     * @param node
     * @return
     */
    public static Map<String,Object> toMetaTree( Node node ) {
        Map<String,Object> result= new LinkedHashMap<>();
        Node child= node.getFirstChild();
        while ( child!=null ) {
            Object value;
            if ( child.hasChildNodes() ) {
                value= toMetaTree( child );
            } else {
                value= child.getNodeValue();
            }
            result.put( child.getNodeName(), value );
            child= child.getNextSibling();
        }
        return result;
    }
    
    public static Node getNode( Node node, String[] path ) {
        int i=0;
        Node child= node.getFirstChild();
        while ( i<path.length ) {
            if ( child==null ) throw new IllegalArgumentException("couldn't find node");
            Object value;
            if ( child.getNodeName().equals( path[i] ) ) {
                node= child;
                child= node.getFirstChild();
                i++;
            } else {
                child= child.getNextSibling();
            }
        }
        return node;
    }
    
    /**
     * returns the object at the path, or null if the path position doesn't exist.
     * @param tree
     * @param path
     * @return Object at the node, if it exists.
     */
    public static Object getNode( Map<String,Object> tree, String[] path ) {
        int i=0;
        Object child= tree.get( path[0] );
        i++;
        while ( i<path.length ) {
            if ( child==null ) return null;
            if ( !(child instanceof Map) ) return null;
            Object value;
            
            child= ((Map)child).get( path[i] );
            i++;
        }
        return child;
    }

    /**
     * slice the properties to reduce rank.  TODO: This all needs review, since the QDataSet model is mature.
     * @param properties
     * @param sliceDimension
     * @see DataSetOps.sliceProperties
     * @return
     */
    public static Map<String,Object> sliceProperties(Map<String,Object> properties, int sliceDimension) {
        return org.das2.qds.DataSetOps.sliceProperties(properties, sliceDimension);
    }

    /**
     * @param properties
     * @return
     */
    public static Map<String,Object> transposeProperties(Map<String,Object> properties) {

        Map<String,Object> result = new LinkedHashMap();
        String[] ss= DataSetUtil.dimensionProperties();
        for ( String s: ss ) {
            Object val= properties.get(s);
            if ( val!=null ) result.put( s, val );
        }

        if ( properties.get("DEPEND_0")!=null ) result.put("DEPEND_1", properties.get("DEPEND_0"));
        if ( properties.get("DEPEND_1")!=null ) result.put("DEPEND_0", properties.get("DEPEND_1"));

        return result;

    }

    /**
     * run the DataSource-provided properties through sprocess.
     * TODO: this has not been implemented for most operations, and this all needs to be reconsidered
     * @param c
     * @param properties
     * @return
     */
    public static Map<String,Object> sprocess( String c, Map<String,Object> properties ) {

        int i= c.indexOf('|');
        if ( i>0 ) {
            c= c.substring(i); // TODO: look at the slice component.
        }
        
        Scanner s= new Scanner( c );
        s.useDelimiter("[\\(\\),]");

        while ( s.hasNext() ) {
            String cmd= s.next();
            if ( cmd.trim().length()==0 ) continue;
            if ( cmd.equals("|slices") ) {
                Pattern skipPattern= Pattern.compile("\\':?\\'");
                List<Object> args= new ArrayList();
                while ( s.hasNextInt() || s.hasNext( skipPattern ) ) {
                    if ( s.hasNextInt() ) {
                        args.add( s.nextInt() );
                    } else {
                        args.add( s.next() );
                    }
                }
                for ( int idim=args.size()-1; idim>=0; idim-- ) {
                    if ( args.get(idim) instanceof Integer ) {
                        properties= sliceProperties( properties, idim );
                    }
                }
            } else if ( cmd.startsWith("|slice") ) {
                int dim= cmd.charAt(6)-'0';
                s.next();
                properties= sliceProperties( properties, dim );
            } else if ( cmd.startsWith("|collapse") ) {
                int dim= cmd.charAt(9)-'0';
                properties= sliceProperties( properties, dim );
                if ( s.hasNextInt() ) {
                     int st= s.nextInt();
                     int en= s.nextInt();
                     logger.fine("not using st and en: "+st+","+en);
                }
            } else if ( cmd.startsWith("|total") && cmd.length()==7 ) {
                int dim= cmd.charAt(6)-'0';
                properties= sliceProperties( properties, dim );                 
            } else if ( cmd.startsWith("|total") && cmd.length()==6 ) {
                int dim= s.nextInt();
                properties= sliceProperties( properties, dim );
            } else if ( cmd.startsWith("|collapse") && cmd.length()==10 ) {
                int dim= cmd.charAt(9)-'0';
                properties= sliceProperties( properties, dim );      
            } else if ( cmd.equals("|autoHistogram") ) {
                Map<String,Object> newproperties= new HashMap<String,Object>();
                newproperties.put( QDataSet.DEPEND_0, properties );
                properties= newproperties;
            } else if ( cmd.equals("|transpose") ) {
                properties= transposeProperties(properties);
            } else if ( cmd.equals("|smooth") ) {
                // do nothing
            } else if ( cmd.equals("|trim") ) {
                // do nothing
            } else if ( cmd.equals("|detrend") ) {
                // do nothing
            } else if ( cmd.equals("|medianFilter") ) {
                // do nothing
            } else if ( cmd.equals("|nop") ) {
                // do nothing
            } else if ( cmd.equals("|copy") ) {
                // do nothing
            } else {
                return new HashMap();
            }
        }
        return properties;
    }

    /**
     * return the MetadataModel object for this identifier, or null.
     * @param t the id of the model, such as "ISTP-CDF", or null.
     * @return
     */
    public static MetadataModel getMetadataModel( String t ) {
        if ( t==null ) return null;
        if ( t.equals(QDataSet.VALUE_METADATA_MODEL_ISTP ) ) {
            return new IstpMetadataModel();
        } else if ( t.equals( QDataSet.VALUE_METADATA_MODEL_SPASE ) ) {
            return new SpaseMetadataModel();
        } else {
            return null;
        }
    }
}