// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
package org.xwt;

import java.io.*;
import java.util.*;
import java.util.zip.*;
import org.xwt.js.*;
import org.xwt.util.*;
import org.bouncycastle.util.encoders.Base64;

/** Manages access to ~/.xwt */
public class LocalStorage {

    static String xwtDirName = System.getProperty("user.home") + java.io.File.separatorChar + ".xwt";

    static java.io.File xwtDir = null;
    static java.io.File cacheDir = null;

    static {
        try {
            xwtDir = new java.io.File(xwtDirName);
            if (!xwtDir.mkdirs()) xwtDir = null;
            try {
                cacheDir = new java.io.File(xwtDirName + java.io.File.separatorChar + "cache");
                if (!cacheDir.mkdirs()) cacheDir = null;
            } catch (Exception e) {
                Log.warn(LocalStorage.class, "unable to create cache directory " +
                         xwtDirName + java.io.File.separatorChar + "cache");
            }
        } catch (Exception e) {
            Log.warn(LocalStorage.class, "unable to create xwt directory " + xwtDirName);
        }
    }

    // FEATURE: we ought to be able to do stuff like sha1-checking and date checking on cached resources    
    public static class Cache {

        private static void delTree(java.io.File f) throws IOException {
            if (f.isDirectory()) {
                String[] s = f.list();
                for(int i=0; i<s.length; i++)
                    delTree(new java.io.File(f.getPath() + java.io.File.separatorChar + s[i]));
            }
            f.delete();
        }

        public static void flush() throws IOException {
            delTree(cacheDir);
            cacheDir.mkdirs();
        }

        public static java.io.File getCacheFileForKey(String key) {
            // FEATURE: be smarter here
            return new java.io.File(cacheDir.getPath() + File.separatorChar + new String(Base64.encode(key.getBytes())));
        }

    }
}