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Copyright 2010, Google Inc.
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    * Redistributions of source code must retain the above copyright
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.importers.tree;

import java.io.Serializable;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import javax.servlet.ServletException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.refine.importers.tree.TreeReader.Token;
import com.google.refine.model.Cell;
import com.google.refine.model.Project;
import com.google.refine.model.Row;

public class XmlImportUtilities extends TreeImportUtilities {
    final static Logger logger = LoggerFactory.getLogger("XmlImportUtilities");

    static public String[] detectPathFromTag(TreeReader parser, String tag) throws TreeReaderException {
        while (parser.hasNext()) {
            Token eventType = parser.next();
            if (eventType == Token.StartEntity) {//XMLStreamConstants.START_ELEMENT) {
                List<String> path = detectRecordElement(parser, tag);
                if (path != null) {
                    String[] path2 = new String[path.size()];

                    path.toArray(path2);

                    return path2;
                }
            }
        }

        return null;
    }

    /**
     * Looks for an element with the given tag name in the Tree data being parsed, returning the path hierarchy to reach it.
     *
     * @param parser
     * @param tag
     *         The element name (can be qualified) to search for
     * @return
     *         If the tag is found, an array of strings is returned.
     *         If the tag is at the top level, the tag will be the only item in the array.
     *         If the tag is nested beneath the top level, the array is filled with the hierarchy with the tag name at the last index
     *         null if the the tag is not found.
     * @throws ServletException
     */
    static protected List<String> detectRecordElement(TreeReader parser, String tag) throws TreeReaderException {
        if(parser.current() == Token.Ignorable) {
            parser.next();
        }

        String localName = parser.getFieldName();
        String fullName = composeName(parser.getPrefix(), localName);
        if (tag.equals(parser.getFieldName()) || tag.equals(fullName)) {
            List<String> path = new LinkedList<String>();
            path.add(localName);

            return path;
        }

        while (parser.hasNext()) {
            Token eventType = parser.next();
            if (eventType == Token.EndEntity) {//XMLStreamConstants.END_ELEMENT) {
                break;
            } else if (eventType == Token.StartEntity) {//XMLStreamConstants.START_ELEMENT) {
                List<String> path = detectRecordElement(parser, tag);
                if (path != null) {
                    path.add(0, localName);
                    return path;
                }
            }
        }
        return null;
    }

    static protected String composeName(String prefix, String localName) {
        return prefix != null && prefix.length() > 0 ? (prefix + ":" + localName) : localName;
    }


    /**
     * @param parser
     * @param project
     * @param recordPath
     * @param rootColumnGroup
     * @param limit
     * @param parameters
     * @throws TreeReaderException
     * @deprecated 2020-07-23 Use {@link XmlImportUtilities#importTreeData(TreeReader, Project, String[], ImportColumnGroup, int, boolean, boolean, boolean)}
     */
    @Deprecated
    static public void importTreeData(
            TreeReader parser,
            Project project,
            String[] recordPath,
            ImportColumnGroup rootColumnGroup,
            int limit,
            ImportParameters parameters
        ) throws TreeReaderException{
        importTreeData(parser, project, recordPath, rootColumnGroup, limit, parameters.trimStrings, parameters.storeEmptyStrings, parameters.guessDataType);
    }
    
    static public void importTreeData(
        TreeReader parser,
        Project project,
        String[] recordPath,
        ImportColumnGroup rootColumnGroup,
        int limit,
        boolean trimStrings,
        boolean storeEmptyStrings,
        boolean guessDataTypes
    ) throws TreeReaderException{
        if (logger.isTraceEnabled()) {
            logger.trace("importTreeData(TreeReader, Project, String[], ImportColumnGroup)");
        }
        try {
            while (parser.hasNext()) {
                Token eventType = parser.next();
                if (eventType == Token.StartEntity) {
                    findRecord(project, parser, recordPath, 0, rootColumnGroup, limit--, trimStrings, storeEmptyStrings,
                            guessDataTypes);
                }
            }
        } catch (TreeReaderException e) {
            logger.error("Exception from XML parse",e);
            throw e;
        }
    }

    /**
     * @param project
     * @param parser
     * @param recordPath
     * @param pathIndex
     * @param rootColumnGroup
     * @param limit
     * @param parameters
     * @throws TreeReaderException
     * @deprecated Use {@link XmlImportUtilities#findRecord(Project, TreeReader, String[], int, ImportColumnGroup, int, boolean, boolean, boolean)}
     */
    @Deprecated
    static protected void findRecord(
            Project project,
            TreeReader parser,
            String[] recordPath,
            int pathIndex,
            ImportColumnGroup rootColumnGroup,
            int limit,
            ImportParameters parameters
        ) throws TreeReaderException {
            findRecord(project, parser, recordPath, pathIndex, rootColumnGroup, limit, parameters.trimStrings,
                    parameters.storeEmptyStrings, parameters.guessDataType);
        }

    /**
     * @param project
     * @param parser
     * @param recordPath
     * @param pathIndex
     * @param rootColumnGroup
     * @param limit
     * @param trimStrings trim whitespace from strings if true
     * @param storeEmptyStrings store empty strings if true
     * @param guessDataTypes guess whether strings represent numbers and convert
     * @throws TreeReaderException
     */
    static protected void findRecord(
        Project project,
        TreeReader parser,
        String[] recordPath,
        int pathIndex,
        ImportColumnGroup rootColumnGroup,
        int limit,
        boolean trimStrings,
        boolean storeEmptyStrings,
        boolean guessDataTypes
    ) throws TreeReaderException {
        if (logger.isTraceEnabled()) {
            logger.trace("findRecord(Project, TreeReader, String[], int, ImportColumnGroup - path:"+Arrays.toString(recordPath));
        }
        if(parser.current() == Token.Ignorable){//XMLStreamConstants.START_DOCUMENT){
            logger.warn("Cannot use findRecord method for START_DOCUMENT event");
            return;
        }
        
        String recordPathSegment = recordPath[pathIndex];
        
        String localName = parser.getFieldName();
        String fullName = composeName(parser.getPrefix(), localName);
        if (recordPathSegment.equals(localName) || recordPathSegment.equals(fullName)) {
            if (pathIndex < recordPath.length - 1) {
                while (parser.hasNext() && limit != 0) {
                    Token eventType = parser.next();
                    if (eventType == Token.StartEntity) {
                        findRecord(project, parser, recordPath, pathIndex + 1, rootColumnGroup, limit--,
                                trimStrings, storeEmptyStrings, guessDataTypes);
                    } else if (eventType == Token.EndEntity) {
                        break;
                    } else if (eventType == Token.Value) {
                        // This is when the user picks a specific field to import, not a whole object or element.
                        if (pathIndex == recordPath.length - 2) {
                            String desiredFieldName = recordPath[pathIndex + 1];
                            String currentFieldName = parser.getFieldName();
                            if (desiredFieldName.equals(currentFieldName)) {
                                processFieldAsRecord(project, parser, rootColumnGroup, trimStrings, storeEmptyStrings, guessDataTypes);
                            }
                        }
                    }
                }
            } else {
                processRecord(project, parser, rootColumnGroup, trimStrings, storeEmptyStrings, guessDataTypes);
            }
        } else {
            skip(parser);
        }
    }

    static protected void skip(TreeReader parser) throws TreeReaderException {
        while (parser.hasNext()) {
            Token eventType = parser.next();
            if (eventType == Token.StartEntity) {//XMLStreamConstants.START_ELEMENT) {
                skip(parser);
            } else if (eventType == Token.EndEntity) { //XMLStreamConstants.END_ELEMENT) {
                return;
            }
        }
    }

    /**
     * @param project
     * @param parser
     * @param rootColumnGroup
     * @param parameter
     * @throws TreeReaderException
     * @deprecated Use {@link XmlImportUtilities#processRecord(Project, TreeReader, ImportColumnGroup, boolean, boolean, boolean)}
     */
    @Deprecated
    static protected void processRecord(
            Project project,
            TreeReader parser,
            ImportColumnGroup rootColumnGroup,
            ImportParameters parameter
        ) throws TreeReaderException {
        processRecord(project, parser, rootColumnGroup, parameter.trimStrings, parameter.storeEmptyStrings, parameter.guessDataType);
    }
    
    /**
     * processRecord parses Tree data for a single element and it's sub-elements,
     * adding the parsed data as a row to the project
     * @param project
     * @param parser
     * @param rootColumnGroup
     * @throws ServletException
     */
    static protected void processRecord(
        Project project,
        TreeReader parser,
        ImportColumnGroup rootColumnGroup,
        boolean trimStrings,
        boolean storeEmptyStrings,
        boolean guessDataTypes
    ) throws TreeReaderException {
        if (logger.isTraceEnabled()) {
            logger.trace("processRecord(Project,TreeReader,ImportColumnGroup)");
        }
        ImportRecord record = new ImportRecord();

        processSubRecord(project, parser, rootColumnGroup, record, 0, trimStrings, storeEmptyStrings, guessDataTypes);
        addImportRecordToProject(record, project);
    }

    /**
     * processFieldAsRecord parses Tree data for a single element and it's sub-elements,
     * adding the parsed data as a row to the project
     * @param project
     * @param parser
     * @param rootColumnGroup
     * @throws TreeReaderException 
     * @throws ServletException
     */
    @Deprecated
    static protected void processFieldAsRecord(Project project, TreeReader parser, ImportColumnGroup rootColumnGroup,
            ImportParameters parameter) throws TreeReaderException {
        processFieldAsRecord(project, parser, rootColumnGroup, parameter.trimStrings, parameter.storeEmptyStrings,
                parameter.guessDataType);
    }

    /**
     * processFieldAsRecord parses Tree data for a single element and it's sub-elements,
     * adding the parsed data as a row to the project
     * @param project
     * @param parser
     * @param rootColumnGroup
     * @throws ServletException
     */
    static protected void processFieldAsRecord(
        Project project,
        TreeReader parser,
        ImportColumnGroup rootColumnGroup,
        boolean trimStrings,
        boolean storeEmptyStrings,
        boolean guessDataType
    ) throws TreeReaderException {
        if (logger.isTraceEnabled()) {
            logger.trace("processFieldAsRecord(Project,TreeReader,ImportColumnGroup)");
        }        
        Serializable value = parser.getValue();
        ImportRecord record = null;
        if (value instanceof String) {
            String text = (String) value;
            if (trimStrings) {
               text = text.trim();
            }
            if (text.length() > 0 | !storeEmptyStrings) {
                record = new ImportRecord();
                addCell(
                        project,
                        rootColumnGroup,
                        record,
                        parser.getFieldName(),
                        (String) value,
                        storeEmptyStrings,
                        guessDataType
                        );
            }
        } else {
            record = new ImportRecord();
            addCell(
                project,
                rootColumnGroup,
                record,
                parser.getFieldName(),
                value
            );
        }
        if (record != null) {
            addImportRecordToProject(record, project);
        }
    }

    @Deprecated
    static protected void addImportRecordToProject(ImportRecord record, Project project,
            boolean includeFileSources, String fileSource, boolean includeArchiveFileName, String archiveFileName) {
        addImportRecordToProject(record, project);
    }
    
    static protected void addImportRecordToProject(ImportRecord record, Project project) {
        for (List<Cell> row : record.rows) {
            if (row.size() > 0) {
                Row realRow = new Row(row.size());
                for (int c = 0; c < row.size(); c++) {
                    Cell cell = row.get(c);
                    if (cell != null) {
                        realRow.setCell(c, cell);
                    }
                }
                project.rows.add(realRow);
            }
        }
    }
    
    @Deprecated
    static protected void processSubRecord(
            Project project,
            TreeReader parser,
            ImportColumnGroup columnGroup,
            ImportRecord record,
            int level,
            ImportParameters parameter
        ) throws TreeReaderException {
            processSubRecord(project, parser, columnGroup, record, level, parameter.trimStrings,
                    parameter.storeEmptyStrings, parameter.guessDataType);
        }
    
    /**
     *
     * @param project
     * @param parser
     * @param columnGroup
     * @param record
     * @throws ServletException
     */
    static protected void processSubRecord(
        Project project,
        TreeReader parser,
        ImportColumnGroup columnGroup,
        ImportRecord record,
        int level,
        boolean trimStrings,
        boolean storeEmptyStrings,
        boolean guessDataType
    ) throws TreeReaderException {
        if (logger.isTraceEnabled()) {
            logger.trace("processSubRecord(Project,TreeReader,ImportColumnGroup,ImportRecord) lvl:"+level+" "+columnGroup);
        }
        
        if(parser.current() == Token.Ignorable) {
            return;
        }
        
        ImportColumnGroup thisColumnGroup = getColumnGroup(
                    project,
                    columnGroup,
                    composeName(parser.getPrefix(), parser.getFieldName()));
        
        thisColumnGroup.nextRowIndex = Math.max(thisColumnGroup.nextRowIndex, columnGroup.nextRowIndex);
        
        int attributeCount = parser.getAttributeCount();
        for (int i = 0; i < attributeCount; i++) {
            String text = parser.getAttributeValue(i);
            if (trimStrings) {
                text = text.trim();
            }
            if (text.length() > 0 | !storeEmptyStrings) {
                addCell(
                    project,
                    thisColumnGroup,
                    record,
                    composeName(parser.getAttributePrefix(i), parser.getAttributeLocalName(i)),
                    text,
                    storeEmptyStrings,
                    guessDataType
                );
            }
        }

        while (parser.hasNext()) {
            Token eventType = parser.next();
            if (eventType == Token.StartEntity) {
                processSubRecord(
                    project,
                    parser,
                    thisColumnGroup,
                    record,
                    level+1,
                    trimStrings,
                    storeEmptyStrings,
                    guessDataType
                );
            } else if (//eventType == XMLStreamConstants.CDATA ||
                        eventType == Token.Value) { //XMLStreamConstants.CHARACTERS) {
                Serializable value = parser.getValue();
                String colName = parser.getFieldName();
                if (value instanceof String) {
                    String text = (String) value;
                    if(trimStrings) {
                        text = text.trim();
                    }
                    addCell(project, thisColumnGroup, record, colName, text, 
                            storeEmptyStrings, guessDataType);
                } else {
                    addCell(project, thisColumnGroup, record, colName, value);
                }
            } else if (eventType == Token.EndEntity) {
                break;
            } else if (eventType == Token.Ignorable) {
                continue;
            } else {
                logger.info("unknown event type " + eventType);
            }
        }

        int nextRowIndex = thisColumnGroup.nextRowIndex;
        for (ImportColumn column2 : thisColumnGroup.columns.values()) {
            nextRowIndex = Math.max(nextRowIndex, column2.nextRowIndex);
        }
        for (ImportColumnGroup columnGroup2 : thisColumnGroup.subgroups.values()) {
            nextRowIndex = Math.max(nextRowIndex, columnGroup2.nextRowIndex);
        }
        thisColumnGroup.nextRowIndex = nextRowIndex;
    }
}
