/*
 * This file is part of McIDAS-V
 *
 * Copyright 2007-2016
 * Space Science and Engineering Center (SSEC)
 * University of Wisconsin - Madison
 * 1225 W. Dayton Street, Madison, WI 53706, USA
 * https://www.ssec.wisc.edu/mcidas
 * 
 * All Rights Reserved
 * 
 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
 * some McIDAS-V source code is based on IDV and VisAD source code.  
 * 
 * McIDAS-V is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * McIDAS-V 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser Public License
 * along with this program.  If not, see http://www.gnu.org/licenses.
 */

package edu.wisc.ssec.mcidasv.data.hrit;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.io.File;
import java.io.IOException;
import java.rmi.RemoteException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JPanel;

import edu.wisc.ssec.mcidas.Calibrator;

import visad.Data;
import visad.VisADException;
import visad.data.hrit.HRITAdapter;

import ucar.unidata.data.DataCategory;
import ucar.unidata.data.DataChoice;
import ucar.unidata.data.DataSelection;
import ucar.unidata.data.DataSelectionComponent;
import ucar.unidata.data.DataSourceDescriptor;
import ucar.unidata.data.DataSourceImpl;
import ucar.unidata.data.DirectDataChoice;
import ucar.unidata.util.Misc;
import ucar.unidata.util.WrapperException;

public class HRITDataSource extends DataSourceImpl  {

    /** List of sources files */
    protected List sources;

    public static String request;

    /** List of sources files */
    protected List adapters;
    
    private List categories;

    /** for unpersistence */
    protected String oldSourceFromBundles;
    
    private static final String DATA_DESCRIPTION = "HRIT Data";
    
    private static int counter = 1;

    /** children choices */
    private List myDataChoices = new ArrayList();

    /**
     * Default constructor
     */
    public HRITDataSource() {}

    /**
     * Construct a new HRIT data source.
     * @param  descriptor  descriptor for this {@code DataSource}
     * @param  fileName  name of the HRIT segment file to read
     * @param  properties  hashtable of properties
     *
     * @throws VisADException problem creating data
     */
    public HRITDataSource(DataSourceDescriptor descriptor,
                                 String fileName, Hashtable properties)
            throws VisADException {
        this(descriptor, Misc.newList(fileName), properties);
    }
    
    /**
     * Construct a new HRIT data source.
     * @param  descriptor  descriptor for this {@code DataSource}
     * @param  newSources  List of filenames
     * @param  properties  hashtable of properties
     *
     * @throws VisADException problem creating data
     */
    public HRITDataSource(DataSourceDescriptor descriptor,
                                 List newSources, Hashtable properties)
            throws VisADException {
        
        this(descriptor, newSources, DATA_DESCRIPTION, properties);
        boolean looksOk = false;
        String dataCategoryStr = "HRIT Data";
        if ((newSources != null) && (newSources.size() >= 1)) {
                String fileNameFullPath = (String) newSources.get(0);
                if ((fileNameFullPath != null) && (fileNameFullPath.length() >= 58)) {
                        if ((fileNameFullPath.contains("MSG2")) && (fileNameFullPath.endsWith("-__"))) {
                                String channelStr = fileNameFullPath.substring(fileNameFullPath.lastIndexOf("MSG2") + 13, fileNameFullPath.lastIndexOf("MSG2") + 19);
                                String timeStr = fileNameFullPath.substring(fileNameFullPath.lastIndexOf("MSG2") + 33, fileNameFullPath.lastIndexOf("MSG2") + 45);
                                dataCategoryStr = "MSG2 " + channelStr + " " + timeStr;
                                looksOk = true;
                        }
                }
        }
        if (looksOk) {
                DataCategory.createCategory(dataCategoryStr);
                categories = DataCategory.parseCategories(dataCategoryStr + ";IMAGE");
        } else {
                throw new VisADException("Not a decompressed MSG HRIT file");
        }
    }    

        /**
     * Create a HRITDataSource
     *
     * @param descriptor The datasource descriptor
     * @param newSources List of files or urls
     * @param description The long name
     * @param properties properties
     *
     * @throws VisADException  couldn't create the data
     */
    public HRITDataSource(DataSourceDescriptor descriptor, List newSources,
                           String description, Hashtable properties) 
            throws VisADException {

        super(descriptor, "HRIT" + counter, "HRIT" + counter, properties);
        counter++;
        sources = newSources;
    }


    /**
     * Can this data source save its data to local disk
     *
     * @return can save to local disk
     */
    public boolean canSaveDataToLocalDisk() {
        return !isFileBased() && (getProperty(PROP_SERVICE_HTTP) != null);
    }


    /**
     * Are we getting data from a file or from server
     * 
     * @return is the data from files
     */
    protected boolean isFileBased() {
        if (sources.size() == 0) {
            return false;
        }
        return (new File(sources.get(0).toString())).exists();
    }

    /**
     * This is called when the CacheManager detects the need ot clear memory.
     * It is intended to be overwritten by derived classes that are holding cached
     * data that is not in the normal putCache facilities provided by this class
     * since that data is actually managed by the CacheManager
     */
    public void clearCachedData() {
        super.clearCachedData();
    }
    
    /**
     * Make and insert the {@link DataChoice DataChoices} for this {@code DataSource}.
     */
    public void doMakeDataChoices() {
        DataChoice choice = null;
        
        for (int i = 0; i < sources.size(); i++) {
                String fileNameFullPath = (String) sources.get(i);
                if (fileNameFullPath.contains("MSG2")) {
                        String channelStr = fileNameFullPath.substring(fileNameFullPath.lastIndexOf("MSG2") + 13, fileNameFullPath.lastIndexOf("MSG2") + 19);
                        String timeStr = fileNameFullPath.substring(fileNameFullPath.lastIndexOf("MSG2") + 33, fileNameFullPath.lastIndexOf("MSG2") + 45);
                        String segStr = fileNameFullPath.substring(fileNameFullPath.lastIndexOf("MSG2") + 27, fileNameFullPath.lastIndexOf("MSG2") + 29);
                        try {
                                choice = doMakeDataChoice(0, "MSG2 " + channelStr + " " + timeStr + " SEGMENT " + segStr);
                        } 
                        catch (Exception e) {
                                e.printStackTrace();
                                System.out.println("doMakeDataChoice failed");
                        }

                        if (choice != null) {
                                addDataChoice(choice);
                        }
                }
        }

    }
    
    private DataChoice doMakeDataChoice(int idx, String var) throws Exception {
        String name = var;
        Hashtable ht = null;
        DirectDataChoice ddc = new DirectDataChoice(this, idx, name, name, categories, ht);
        return ddc;
    }
    
    /**
     * Create, if needed, and return the list of adapters.
     * Will return null if there are no valid adapters.
     *
     * @return List of adapters or null
     */
    protected List getAdapters() {
        if ((adapters == null) || (adapters.size() == 0)) {
            try {
                makeAdapters(sources);
            } catch (Exception exc) {
                setInError(true);
                throw new WrapperException(exc);
            }
        }
        if (adapters.size() == 0) {
            adapters = null;
        }
        return adapters;
    }

    /**
     * Make the adapters for the given list of files
     *
     * @param files Data files
     *
     * @throws Exception When bad things happen
     */
    private void makeAdapters(List files) throws Exception {
        adapters = new ArrayList();
    }


    /**
     * Create the list of times associated with this DataSource.
     * @return list of times.
     */
    protected List doMakeDateTimes() {
        List    times      = new ArrayList();
        return times;
    }

    /**
     * Get the data for the given DataChoice and selection criteria.
     * @param dataChoice         DataChoice for selection
     * @param category           DataCategory for the DataChoice (not used)
     * @param dataparams         Resolution criteria.
     * @param requestProperties  extra request properties
     * @return  the Data object for the request
     *
     * @throws RemoteException couldn't create a remote data object
     * @throws VisADException  couldn't create the data
     */
    protected Data getDataInner(DataChoice dataChoice, DataCategory category,
                                DataSelection dataparams,
                                Hashtable requestProperties)
            throws VisADException, RemoteException {

        // for now, hardcoded array of band center wave numbers, such that'
        // the array index is the band number
        String[] bandCWN = { 
                        "N/A", "006", "008", "016", "039", "062", "073",
                        "087", "097", "108", "120", "134", "___"
        };
        
        // XXX TJJ need to determine this from data type and wavelength
        int bandNum = 1;
        // default to BRIT calibration, will check if user picked something else
        int calType = Calibrator.CAL_BRIT;
        
        String newRes = (String) dataparams.getProperty("magnification");
        int magFactor = 1;
        if (newRes != null) {
                try {
                        magFactor = Integer.parseInt(newRes);
                } catch (NumberFormatException nfe) {
                        nfe.printStackTrace();
                }
        }

        // pull out source index 
        String idxStr = dataChoice.getName().substring(dataChoice.getName().length() - 2, dataChoice.getName().length());
        
        Data data = null;
        
        String [] files = new String[1];
        // initialize central wave number string
        String cwnStr = "006";
        for (int i = 0; i < sources.size(); i++) {
                String tmpStr = (String) sources.get(i);
                cwnStr = tmpStr.substring(tmpStr.lastIndexOf("MSG2") + 16, tmpStr.lastIndexOf("MSG2") + 19);
                String segStr = tmpStr.substring(tmpStr.lastIndexOf("MSG2") + 27, tmpStr.lastIndexOf("MSG2") + 29);
                if (segStr.equals(idxStr)) {
                        files[0] = (String) sources.get(i);
                }
        }
        
        // match up central wave number with band number index
        for (int i = 0; i < bandCWN.length; i++) {
                if (bandCWN[i].equals(cwnStr)) {
                        bandNum = i;
                        break;
                }
        }
        
        String newCal = (String) dataparams.getProperty("calibration");
        // do checks to only allow valid calibrations here
        if (newCal != null) {
                if ((bandNum >= 4) && (bandNum <= 11)) {
                        if (newCal.equals("RAD")) {
                                calType = Calibrator.CAL_RAD;
                        }
                        if (newCal.equals("TEMP")) {
                                calType = Calibrator.CAL_TEMP;
                        }
                        if (newCal.equals("BRIT")) {
                                calType = Calibrator.CAL_BRIT;
                        }
                } else {
                        if (newCal.equals("RAD")) {
                                calType = Calibrator.CAL_RAD;
                        }
                        if (newCal.equals("ALB")) {
                                calType = Calibrator.CAL_ALB;
                        }
                        if (newCal.equals("BRIT")) {
                                calType = Calibrator.CAL_BRIT;
                        }                       
                }
        }

        HRITAdapter ha;
                try {
                        ha = new HRITAdapter(files, magFactor, calType, bandNum);
                        data = ha.getData();
                } catch (IOException e) {
                        e.printStackTrace();
                }

                return data;
    }

    protected void initDataSelectionComponents(
                List<DataSelectionComponent> components,
                final DataChoice dataChoice) {

        try {
                components.add(new ResolutionSelection(dataChoice));
        } 
        catch (Exception e) {
                e.printStackTrace();
        }
    }


    class ResolutionSelection extends DataSelectionComponent {

        DataChoice dataChoice;
        JPanel display;
        JComboBox jcbMag = null;
        JComboBox jcbCal = null;

        ResolutionSelection(DataChoice dataChoice) throws Exception {
                super("Magnification and Calibration");
                this.dataChoice = dataChoice;
                List names = dataChoice.getCurrentNames();
                display = new JPanel(new FlowLayout());
                String[] resStrings = { "1", "2", "4", "8", "16" };
                jcbMag = new JComboBox(resStrings);
                display.add(jcbMag);
                String[] irCalStrings  = { "BRIT", "RAD", "RAW", "TEMP" };
                String[] visCalStrings = { "BRIT", "RAD", "RAW", "ALB" };
                // XXX TJJ - we need a standard mechanism to make this determination
                // this is a temporary cheap hack: grab the last file name added and 
                // do a hardcoded string match.
                String sampleFileName = names.get(names.size() - 1).toString();
                // those below are considered "visible" bands, yes even IR_016!
                if ((sampleFileName.contains("VIS")) ||
                        (sampleFileName.contains("HRV")) ||
                        (sampleFileName.contains("IR_016"))
                                ) {
                        jcbCal = new JComboBox(visCalStrings);
                } else {
                        jcbCal = new JComboBox(irCalStrings);
                }
                display.add(jcbCal);
        }

        protected JComponent doMakeContents() {
                try {
                        JPanel panel = new JPanel(new BorderLayout());
                        panel.add("Center", display);
                        return panel;
                }
                catch (Exception e) {
                        System.out.println(e);
                }
                return null;
        }

        public void applyToDataSelection(DataSelection dataSelection) {
                try {
                        dataSelection.putProperty("magnification", jcbMag.getSelectedItem());
                        dataSelection.putProperty("calibration", jcbCal.getSelectedItem());
                } catch (Exception e) {
                        e.printStackTrace();
                }
        }
    }
}