package de.intevation.flys.importer.parsers;

import java.util.ArrayList;
import java.util.Map;
import java.util.List;
import java.util.TreeMap;

import java.util.regex.Pattern;

import java.io.File;
import java.io.IOException;

import org.apache.log4j.Logger;

import de.intevation.flys.importer.XY;

import de.intevation.artifacts.common.utils.FileTools;


/**
 * To create cross-sections, generate: Map<double,list<xy>> from files
 * in da66 format.
 */
public class W80Parser extends LineParser implements CrossSectionParser
{
    /** Private logger. */
    private static Logger logger = Logger.getLogger(W80Parser.class);

    /** Regex to match lines of files in da66 format. */
    private static final Pattern LINE_PATTERN =
        Pattern.compile("[\\p{Alnum} ]{20}" + // ID
                        "[0-9 ]{10} " + // GK-right
                        "[0-9 ]{10} " + // GK-left
                        "[0-9 ]{6} " + // date
                        "[0-9 ]{1} " + // kind of exactness of measurement
                        "[0-9 ]{7} " + // height
                        "[0-9 ]{6} " + // date of height
                        "[0-9 ]{1} " + // kind of exactness of height-measurement
                        "[0-9 ]{3} " + // kind (only for NIV-points)
                        "[\\p{Alnum} ]{6} " + // date of point decline
                        "[\\p{Alnum} ]{8} " + // note for point
                        "[0-9 ]{2} "  // actuality
                        );

    // TODO define headers regex, use regex or remove it.


    /** The current line to which add points. */
    private List<XY> currentLine;


    /** Data collected so far, last element will be currentLine. */
    protected Map<Double, List<XY>> data;


    /** Trivial constructor. */
    public W80Parser() {
        data = new TreeMap<Double, List<XY>>();
    }


    /** Get the description of the cross section parsed. */
    @Override
    public String getDescription() {
        return FileTools.removeExtension(getFileName());
    }


    /** Get the year of this cross sections measurement. */
    @Override
    public Integer getYear() {
        return null;
    }


    /**
     * Return the data parsed.
     * @return map of stations (km) to list of points.
     */
    @Override
    public Map<Double, List<XY>> getData() {
        return data;
    }


    public void parseW80s(File root, final Callback callback) {

        // TODO use the removeExtension/guess description and date.
        FileTools.walkTree(root, new FileTools.FileVisitor() {
            @Override
            public boolean visit(File file) {
                if (file.isFile() && file.canRead()
                && file.getName().toLowerCase().endsWith(".w80")
                && (callback == null || callback.accept(file))) {
                    reset();
                    try {
                        parse(file);
                        logger.info("parsing done");
                        if (callback != null) {
                            callback.parsed(W80Parser.this);
                        }
                    }
                    catch (IOException ioe) {
                        logger.error("IOException while parsing file");
                        return false;
                    }
                }
                return true;
            }
        });
    }


    /** Called before consuming first line of file. */
    public void reset() {
        data.clear();
        currentLine = new ArrayList<XY>();
    }


    /**
     * Called for each line. Try to extract info from a da66 line.
     */
    @Override
    protected void handleLine(int lineNum, String line) {
        String pointId = line.substring(0,20);
        String gkRight = line.substring(20,30);
        String gkHigh  = line.substring(30,40);
        String date    = line.substring(40,46);
        String locType = line.substring(46,47);
        String height  = line.substring(47,54);
        String dateH   = line.substring(54,60);
        String typeH   = line.substring(60,61);
        String kindH   = line.substring(61,64);
        String dateDec = line.substring(64,70);
        String note    = line.substring(70,78);
        String actual  = line.substring(78);
    }


    /** Called when file is fully consumed. */
    @Override
    protected void finish() {
        logger.info("Parsed " + data.size() + " lines");
    }


    /** Parses files given as arguments. */
    public static void main(String [] args) {

        W80Parser parser = new W80Parser();

        logger.warn("Start parsing files.");
        for (String arg: args) {
            parser.parseW80s(new File(arg), null);
            logger.warn("Parsing a file.");
        }
        logger.error("Finished parsing files.");
    }
}
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