/*
       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.FileNotFoundException;
import java.io.IOException;

import org.apache.cordova.CordovaInterface;
import org.apache.cordova.CordovaResourceApi.OpenForReadResult;
import org.apache.cordova.LOG;

import android.annotation.TargetApi;
import android.net.Uri;
import android.os.Build;
import com.amazon.android.webkit.AmazonWebResourceResponse;
import com.amazon.android.webkit.AmazonWebView;

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class IceCreamCordovaWebViewClient extends CordovaWebViewClient {

    private static final String TAG = "IceCreamCordovaWebViewClient";
    private CordovaUriHelper helper;

    public IceCreamCordovaWebViewClient(CordovaInterface cordova) {
        super(cordova);
    }
    
    public IceCreamCordovaWebViewClient(CordovaInterface cordova, CordovaWebView view) {
        super(cordova, view);
    }

    @Override
    public AmazonWebResourceResponse shouldInterceptRequest(AmazonWebView view, String url) {
        try {
            // Check the against the whitelist and lock out access to the WebView directory
            // Changing this will cause problems for your application
            if (isUrlHarmful(url)) {
                LOG.w(TAG, "URL blocked by whitelist: " + url);
                // Results in a 404.
                return new AmazonWebResourceResponse("text/plain", "UTF-8", null);
            }

            CordovaResourceApi resourceApi = appView.getResourceApi();
            Uri origUri = Uri.parse(url);
            // Allow plugins to intercept AmazonWebView requests.
            Uri remappedUri = resourceApi.remapUri(origUri);
            
            if (!origUri.equals(remappedUri) || needsSpecialsInAssetUrlFix(origUri) || needsKitKatContentUrlFix(origUri)) {
                OpenForReadResult result = resourceApi.openForRead(remappedUri, true);
                return new AmazonWebResourceResponse(result.mimeType, "UTF-8", result.inputStream);
            }
            // If we don't need to special-case the request, let the browser load it.
            return null;
        } catch (IOException e) {
            if (!(e instanceof FileNotFoundException)) {
                LOG.e("IceCreamCordovaWebViewClient", "Error occurred while loading a file (returning a 404).", e);
            }
            // Results in a 404.
            return new AmazonWebResourceResponse("text/plain", "UTF-8", null);
        }
    }

    private boolean isUrlHarmful(String url) {
        return ((url.startsWith("http:") || url.startsWith("https:")) && !appView.getWhitelist().isUrlWhiteListed(url))
            || url.contains("app_webview");
    }

    private static boolean needsKitKatContentUrlFix(Uri uri) {
        return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && "content".equals(uri.getScheme());
    }

    private static boolean needsSpecialsInAssetUrlFix(Uri uri) {
        if (CordovaResourceApi.getUriType(uri) != CordovaResourceApi.URI_TYPE_ASSET) {
            return false;
        }
        if (uri.getQuery() != null || uri.getFragment() != null) {
            return true;
        }
        
        if (!uri.toString().contains("%")) {
            return false;
        }

        switch(android.os.Build.VERSION.SDK_INT){
            case android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH:
            case android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1:
                return true;
        }
        return false;
    }
}