import java.io.*;
import java.util.*;

public class SHTMLReader
{

    // -------------------------------------------------------------------------
    //  Variables
    // -------------------------------------------------------------------------

    private BufferedReader shtmlReader;
    private BufferedReader includeReader;
    private File shtmlFile;
    private String line;
    private String includeLine;
    private String afterInclude;
    private String rootDir;
    private boolean inInclude;

    // -------------------------------------------------------------------------
    //  Constructor
    // -------------------------------------------------------------------------

    public SHTMLReader(File shtmlFile) throws IOException
    {
        this.shtmlFile = shtmlFile;
        inInclude = false;
        rootDir = "";
        FileReader fileReader = new FileReader(shtmlFile);
        shtmlReader = new BufferedReader(fileReader);
    }

    // -------------------------------------------------------------------------
    //  Methods
    // -------------------------------------------------------------------------

    public String readLine() throws IOException
    {
        line = "";
        if (!inInclude)
        {
            readSHTML();
        }
        else
        {
            readInclude();
        }
        if (line != null)
        {
            replaceIncludes();
            replaceLinks();
        }
        return line;
    }

    private void readSHTML() throws IOException
    {
        line = shtmlReader.readLine();
    }

    private void readInclude() throws IOException
    {
        if (includeLine == null)
        {
            includeLine = includeReader.readLine();
        }
        if (includeLine != null)
        {
            line += includeLine;
            includeLine = includeReader.readLine();
        }
        if (includeLine == null)
        {
            inInclude = false;
            includeReader.close();
            includeReader = null;
            line += afterInclude;
        }
    }

    private void replaceIncludes() throws IOException
    {
        int index = line.indexOf("<!--#include file=" + '"');
        int endIndex = line.indexOf('"' + "-->");
        if (index != -1 && endIndex > index)
        {
            int slashIndex = line.lastIndexOf("./", endIndex);
            if (slashIndex != -1)
                rootDir = line.substring(index + 19, slashIndex + 2);
            else
                rootDir = "";
        }

        while (index != -1)
        {
            inInclude = true;
            File includeFile = new File(shtmlFile.getAbsoluteFile().getParent(), line.substring(index + 19, endIndex));
            FileReader fileReader = new FileReader(includeFile);
            includeReader = new BufferedReader(fileReader);
            afterInclude = (line.substring(endIndex + 4, line.length()));
            line = (line.substring(0, index));
            readInclude();
            index = line.indexOf("<!--#include file=" + '"');
            endIndex = line.indexOf('"' + "-->");
        }

        index = line.indexOf("<!--#rootdir-->");
        while (index != -1)
        {
            line = line.substring(0, index) + rootDir + line.substring(index + 15, line.length());
            index = line.indexOf("<!--#rootdir-->");
        }

        index = line.indexOf("<!--#flastmod-->");
        while (index != -1)
        {
            line = line.substring(0, index) + new Date(shtmlFile.lastModified()) + line.substring(index + 16, line.length());
            index = line.indexOf("<!--#flastmod-->");
        }

        index = line.indexOf("<!--#fsize-->");
        while (index != -1)
        {
            line = line.substring(0, index) + (Math.round(shtmlFile.length() / 10.24) / 100.0) + " KB"+ line.substring(index + 13, line.length());
            index = line.indexOf("<!--#fsize-->");
        }
    }

    private void replaceLinks() throws IOException
    {
        int index = line.indexOf(".shtm");
        while (index != -1)
        {
            line = line.substring(0, index) + ".htm" + line.substring(index + 5, line.length());
            index = line.indexOf(".shtm");
        }
    }

    public void close() throws IOException
    {
        shtmlReader.close();
    }

}