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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.tika.parser.mat;

//JDK imports
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Set;
import java.util.Map;

import org.apache.tika.exception.TikaException;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.mime.MediaType;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

//JMatIO imports
import com.jmatio.io.MatFileHeader;
import com.jmatio.io.MatFileReader;
import com.jmatio.types.MLArray;
import com.jmatio.types.MLStructure;

import static java.nio.charset.StandardCharsets.UTF_8;


public class MatParser extends AbstractParser {

    public static final String MATLAB_MIME_TYPE =
            "application/x-matlab-data";

    private final Set SUPPORTED_TYPES =
            Collections.singleton(MediaType.application("x-matlab-data"));

    public Set getSupportedTypes(ParseContext context){
        return SUPPORTED_TYPES;
    }

    public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context)
            throws IOException, SAXException, TikaException {

        //Set MIME type as Matlab
        metadata.set(Metadata.CONTENT_TYPE, MATLAB_MIME_TYPE);

        try {
            // Use TIS so we can spool a temp file for parsing.
            TikaInputStream tis = TikaInputStream.get(stream);

            //Extract information from header file
            MatFileReader mfr = new MatFileReader(tis.getFile()); //input .mat file
            MatFileHeader hdr = mfr.getMatFileHeader(); //.mat header information

            // Example header: "MATLAB 5.0 MAT-file, Platform: MACI64, Created on: Sun Mar  2 23:41:57 2014"
            String[] parts = hdr.getDescription().split(","); // Break header information into its parts

            if (parts[2].contains("Created")) {
                int lastIndex1 = parts[2].lastIndexOf("Created on:");
                String dateCreated = parts[2].substring(lastIndex1 + "Created on:".length()).trim();
                metadata.set("createdOn", dateCreated);
            }

            if (parts[1].contains("Platform")) {
                int lastIndex2 = parts[1].lastIndexOf("Platform:");
                String platform = parts[1].substring(lastIndex2 + "Platform:".length()).trim();
                metadata.set("platform" , platform);
            }

            if (parts[0].contains("MATLAB")) {
                metadata.set("fileType", parts[0]);
            }

            // Get endian indicator from header file
            String endianBytes = new String(hdr.getEndianIndicator(), UTF_8); // Retrieve endian bytes and convert to string
            String endianCode = String.valueOf(endianBytes.toCharArray()); // Convert bytes to characters to string
            metadata.set("endian", endianCode);

            //Text output	
            XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
            xhtml.startDocument();
            xhtml.newline();
            //Loop through each variable
            for (Map.Entry entry : mfr.getContent().entrySet()) {
                String varName = entry.getKey();
                MLArray varData = entry.getValue();

                xhtml.element("p", varName + ":" + String.valueOf(varData));

                // If the variable is a structure, extract variable info from structure
                if (varData.isStruct()){
                    MLStructure mlStructure = (MLStructure) mfr.getMLArray(varName);
                    xhtml.startElement("ul");
                    xhtml.newline();
                    for (MLArray element : mlStructure.getAllFields()){
                        xhtml.startElement("li");
                        xhtml.characters(String.valueOf(element));

                        // If there is an embedded structure, extract variable info.
                        if (element.isStruct()){
                            xhtml.startElement("ul");
                            // Should this actually be a recursive call?
                            xhtml.element("li", element.contentToString());
                            xhtml.endElement("ul");
                        }

                        xhtml.endElement("li");
                    }
                    xhtml.endElement("ul");
                }
            }
            xhtml.endDocument();
        } catch (IOException e) {
            throw new TikaException("Error parsing Matlab file with MatParser", e);
        }
    }
}