package com.ngMAT.appl.ezfile.servlets;

import  java.io.ByteArrayOutputStream;
import  java.io.File;
import  java.io.FileInputStream;
import  java.io.IOException;
import  javax.servlet.http.HttpServletResponse;
import  com.ngMAT.Common.Log;
import  com.ngMAT.HTML.HTMLComponent;
import  com.ngMAT.HTML.HTMLTemplate;
import  com.ngMAT.HTML.ByteArrayComponent;

import com.ngMAT.appl.genericservlet.GenericServlet;
import com.ngMAT.appl.genericservlet.GenericServletConfig;
import com.ngMAT.appl.genericservlet.GenericServletContext;

public class EZFileServlet extends GenericServlet
{
    public boolean isReadyToGo(GenericServletContext context)
    {
        // This method is derived from class com.ngMAT.appl.genericservlet.GenericServlet
        // to do: code goes here
        return true;
    }

    public HTMLComponent process(GenericServletContext context)
    {
        // This method is derived from class com.ngMAT.appl.genericservlet.GenericServlet
        // to do: code goes here
        EZFileServletConfig config = (EZFileServletConfig)context.getConfig();
//        String  uri = context.getRequestURI();
        String  uri = config.path_handler.getPath (context);

        if (isDir (config, context, uri)) {
            if (! uri.endsWith (config.path_separator)) uri = uri + config.path_separator;
            uri = uri + config.default_filename;
            context.sendRedirect (uri);
            return null;
        }
        if (isHTML (config, context, uri)) {
            try {
                HTMLTemplate output = context.getTemplate (config.document_root + uri);
                return output;
            } catch (Throwable t) {
                getLog().println (t.getMessage());
                try {
                    context.sendError (HttpServletResponse.SC_NOT_FOUND);
                } catch (IOException e2) {
                    //  エラーを送れなかったらあきらめる(^^ゞ
                }
                return config.not_available_template;
            }
        }
        else {
            try {
                ByteArrayComponent bac = new ByteArrayComponent();
                FileInputStream fis = new FileInputStream (
                            config.TemplateFolder + config.path_separator + config.document_root + uri);
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024 * 64];
                int len;
                while ((len = fis.read (buffer)) >= 0) {
                    baos.write (buffer, 0, len);
                }
                fis.close();
                bac.setMimeType (findMimeType (config, context, uri));
                bac.setBuffer (baos.toByteArray());
                baos.close();
                return bac;
            } catch (java.io.FileNotFoundException e) {
                try {
                    context.sendError (HttpServletResponse.SC_NOT_FOUND);
                } catch (IOException e2) {
                    //  エラーを送れなかったらあきらめる(^^ゞ
                }
                return null;
            } catch (java.io.IOException e) {
                throw new com.ngMAT.Common.LowLevelException (e);
            }
        }
    }

    public  boolean isHTML (EZFileServletConfig config, GenericServletContext context, String path) {
        boolean res = false;
        path = path.toLowerCase();
        for (int i = 0; i < config.html_extentions.size(); i++) {
            if (path.endsWith ((String)config.html_extentions.elementAt (i))) {
                res = true;
                break;
            }
        }
        return res;
    }

    public  boolean isTextfile (EZFileServletConfig config, GenericServletContext context, String path)
    {
        int x = path.lastIndexOf (".");
        if (x < 0) return false;
        return config.textfile_extentions.indexOf ("," + path.substring (x) + ",") >= 0;
    }

    public  boolean isDir (EZFileServletConfig config, GenericServletContext context, String path)
    {
        if (path.endsWith (config.path_separator)) return true;
        File f = new File (config.document_root + path);
        return f.isDirectory();
    }

    private String  findMimeType (EZFileServletConfig config, GenericServletContext context, String path)
    {
        int x = path.lastIndexOf (".");
        if (x >= 0)
        {
            String res = config.mime_types.getProperty (path.substring (x + 1));
            if (res != null)
            {
                if (isTextfile (config, context, path))
                {
                    res += "; charset=" + config.getServletCharSet();
                }
                return res;
            }
        }
        return config.mime_types.getProperty ("*");
    }
}