/*
       Licensed to the Apache Software Foundation (ASF) under one
       or more contributor license agreements.  See the NOTICE file
       distributed with this work for additional information
       regarding copyright ownership.  The ASF licenses this file
       to you under the Apache License, Version 2.0 (the
       "License"); you may not use this file except in compliance
       with the License.  You may obtain a copy of the License at

         http://www.apache.org/licenses/LICENSE-2.0

       Unless required by applicable law or agreed to in writing,
       software distributed under the License is distributed on an
       "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
       KIND, either express or implied.  See the License for the
       specific language governing permissions and limitations
       under the License.
*/

package org.apache.cordova;

import java.io.IOException;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.cordova.api.LOG;

import org.xmlpull.v1.XmlPullParserException;

import android.app.Activity;

import android.content.res.XmlResourceParser;
import android.graphics.Color;

import android.util.Log;

public class Config {

    public static final String TAG = "Config";

    private ArrayList<Pattern> whiteList = new ArrayList<Pattern>();
    private HashMap<String, Boolean> whiteListCache = new HashMap<String, Boolean>();
    private String startUrl;

    private static Config self = null;

    public static void init(Activity action) {
        //Just re-initialize this! Seriously, we lose this all the time
        self = new Config(action);
    }

    // Intended to be used for testing only; creates an empty configuration.
    public static void init() {
        if (self == null) {
            self = new Config();
        }
    }

    // Intended to be used for testing only; creates an empty configuration.
    private Config() {
    }

    private Config(Activity action) {
        if (action == null) {
            LOG.i("CordovaLog", "There is no activity. Is this on the lock screen?");
            return;
        }

        int id = action.getResources().getIdentifier("config", "xml", action.getClass().getPackage().getName());
        if (id == 0) {
            id = action.getResources().getIdentifier("cordova", "xml", action.getPackageName());
            LOG.i("CordovaLog", "config.xml missing, reverting to cordova.xml");
        }
        if (id == 0) {
            LOG.i("CordovaLog", "cordova.xml missing. Ignoring...");
            return;
        }

        XmlResourceParser xml = action.getResources().getXml(id);
        int eventType = -1;
        while (eventType != XmlResourceParser.END_DOCUMENT) {
            if (eventType == XmlResourceParser.START_TAG) {
                String strNode = xml.getName();

                if (strNode.equals("access")) {
                    String origin = xml.getAttributeValue(null, "origin");
                    String subdomains = xml.getAttributeValue(null, "subdomains");
                    if (origin != null) {
                        this._addWhiteListEntry(origin, (subdomains != null) && (subdomains.compareToIgnoreCase("true") == 0));
                    }
                }
                else if (strNode.equals("log")) {
                    String level = xml.getAttributeValue(null, "level");
                    Log.d(TAG, "The <log> tags is deprecated. Use <preference name=\"loglevel\" value=\"" + level + "\"/> instead.");
                    if (level != null) {
                        LOG.setLogLevel(level);
                    }
                }
                else if (strNode.equals("preference")) {
                    String name = xml.getAttributeValue(null, "name").toLowerCase(Locale.getDefault());
                    /* Java 1.6 does not support switch-based strings
                       Java 7 does, but we're using Dalvik, which is apparently not Java.
                       Since we're reading XML, this has to be an ugly if/else.
                       
                       Also, due to cast issues, each of them has to call their separate putExtra!  
                       Wheee!!! Isn't Java FUN!?!?!?
                       
                       Note: We should probably pass in the classname for the variable splash on splashscreen!
                       */
                    if (name.equalsIgnoreCase("LogLevel")) {
                        String level = xml.getAttributeValue(null, "value");
                        LOG.setLogLevel(level);
                    } else if (name.equalsIgnoreCase("SplashScreen")) {
                        String value = xml.getAttributeValue(null, "value");
                        int resource = 0;
                        if (value == null)
                        {
                            value = "splash";
                        }
                        resource = action.getResources().getIdentifier(value, "drawable", action.getClass().getPackage().getName());
                        
                        action.getIntent().putExtra(name, resource);
                    }
                    else if(name.equalsIgnoreCase("BackgroundColor")) {
                        int value = xml.getAttributeIntValue(null, "value", Color.BLACK);
                        action.getIntent().putExtra(name, value);
                    }
                    else if(name.equalsIgnoreCase("LoadUrlTimeoutValue")) {
                        int value = xml.getAttributeIntValue(null, "value", 20000);
                        action.getIntent().putExtra(name, value);
                    }
                    else if(name.equalsIgnoreCase("KeepRunning"))
                    {
                        boolean value = xml.getAttributeValue(null, "value").equals("true");
                        action.getIntent().putExtra(name, value);
                    }
                    else if(name.equalsIgnoreCase("InAppBrowserStorageEnabled"))
                    {
                        boolean value = xml.getAttributeValue(null, "value").equals("true");
                        action.getIntent().putExtra(name, value);
                    }
                    else if(name.equalsIgnoreCase("DisallowOverscroll"))
                    {
                        boolean value = xml.getAttributeValue(null, "value").equals("true");
                        action.getIntent().putExtra(name, value);
                    }
                    else
                    {
                        String value = xml.getAttributeValue(null, "value");
                        action.getIntent().putExtra(name, value);
                    }
                    /*
                    LOG.i("CordovaLog", "Found preference for %s=%s", name, value);
                     */
                }
                else if (strNode.equals("content")) {
                    String src = xml.getAttributeValue(null, "src");

                    LOG.i("CordovaLog", "Found start page location: %s", src);

                    if (src != null) {
                        Pattern schemeRegex = Pattern.compile("^[a-z-]+://");
                        Matcher matcher = schemeRegex.matcher(src);
                        if (matcher.find()) {
                            startUrl = src;
                        } else {
                            if (src.charAt(0) == '/') {
                                src = src.substring(1);
                            }
                            startUrl = "file:///android_asset/www/" + src;
                        }
                    }
                }

            }

            try {
                eventType = xml.next();
            } catch (XmlPullParserException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * Add entry to approved list of URLs (whitelist)
     *
     * @param origin        URL regular expression to allow
     * @param subdomains    T=include all subdomains under origin
     */
    public static void addWhiteListEntry(String origin, boolean subdomains) {
        if (self == null) {
            return;
        }

        self._addWhiteListEntry(origin, subdomains);
    }

    /*
     * Trying to figure out how to match * is a pain
     * So, we don't use a regex here
     */
    
    private boolean originHasWildcard(String origin){
        //First, check for a protocol, then split it if it has one.
        if(origin.contains("//"))
        {
            origin = origin.split("//")[1];
        }
        return origin.startsWith("*");
    }

    private void _addWhiteListEntry(String origin, boolean subdomains) {
        try {
            // Unlimited access to network resources
            if (origin.compareTo("*") == 0) {
                LOG.d(TAG, "Unlimited access to network resources");
                this.whiteList.add(Pattern.compile(".*"));
            }
            else { // specific access
                // check if subdomains should be included
                if(originHasWildcard(origin))
                {
                    subdomains = true;
                    //Remove the wildcard so this works properly
                    origin = origin.replace("*.", "");
                }
                
                // TODO: we should not add more domains if * has already been added
                Pattern schemeRegex = Pattern.compile("^[a-z-]+://");
                Matcher matcher = schemeRegex.matcher(origin);
                if (subdomains) {
                    // Check for http or https protocols
                    if (origin.startsWith("http")) {
                        this.whiteList.add(Pattern.compile(origin.replaceFirst("https?://", "^https?://(.*\\.)?")));
                    }
                    // Check for other protocols
                    else if(matcher.find()){
                        this.whiteList.add(Pattern.compile("^" + origin.replaceFirst("//", "//(.*\\.)?")));
                    }
                    // XXX making it stupid friendly for people who forget to include protocol/SSL
                    else {
                        this.whiteList.add(Pattern.compile("^https?://(.*\\.)?" + origin));
                    }
                    LOG.d(TAG, "Origin to allow with subdomains: %s", origin);
                } else {
                    // Check for http or https protocols
                    if (origin.startsWith("http")) {
                        this.whiteList.add(Pattern.compile(origin.replaceFirst("https?://", "^https?://")));
                    }
                    // Check for other protocols
                    else if(matcher.find()){
                        this.whiteList.add(Pattern.compile("^" + origin));
                    }
                    // XXX making it stupid friendly for people who forget to include protocol/SSL
                    else {
                        this.whiteList.add(Pattern.compile("^https?://" + origin));
                    }
                    LOG.d(TAG, "Origin to allow: %s", origin);
                }
            }
        } catch (Exception e) {
            LOG.d(TAG, "Failed to add origin %s", origin);
        }
    }


    /**
     * Determine if URL is in approved list of URLs to load.
     *
     * @param url
     * @return
     */
    public static boolean isUrlWhiteListed(String url) {
        if (self == null) {
            return false;
        }

        // Check to see if we have matched url previously
        if (self.whiteListCache.get(url) != null) {
            return true;
        }

        // Look for match in white list
        Iterator<Pattern> pit = self.whiteList.iterator();
        while (pit.hasNext()) {
            Pattern p = pit.next();
            Matcher m = p.matcher(url);

            // If match found, then cache it to speed up subsequent comparisons
            if (m.find()) {
                self.whiteListCache.put(url, true);
                return true;
            }
        }
        return false;
    }

    public static String getStartUrl() {
        if (self == null || self.startUrl == null) {
            return "file:///android_asset/www/index.html";
        }
        return self.startUrl;
    }
}
