/*
 * Copyright 2016 Anton Tananaev (anton@traccar.org)
 *
 * Licensed 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.traccar.manager;

import android.content.pm.ApplicationInfo;
import android.content.res.AssetManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.webkit.MimeTypeMap;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebViewFragment;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.util.HashMap;
import java.util.Map;

public class MainFragment extends WebViewFragment {

    private String version = "3.7";
    private Uri serverUri;
    private AssetManager assetManager;

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        assetManager = getActivity().getAssets();

        if ((getActivity().getApplicationInfo().flags &= ApplicationInfo.FLAG_DEBUGGABLE) != 0) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                WebView.setWebContentsDebuggingEnabled(true);
            }
        }

        getWebView().setWebViewClient(webViewClient);

        WebSettings webSettings = getWebView().getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setDatabaseEnabled(true);

        String url = PreferenceManager.getDefaultSharedPreferences(
                getActivity()).getString(MainActivity.PREFERENCE_URL, null);
        serverUri = Uri.parse(url);

        getWebView().loadUrl(url);
    }

    public String getMimeType(String url) {
        String extension = MimeTypeMap.getFileExtensionFromUrl(url);
        if (extension != null) {
            switch (extension) {
                case "js":
                    return "text/javascript";
                case "woff":
                    return "application/font-woff";
                case "woff2":
                    return "application/font-woff2";
                case "ttf":
                    return "application/x-font-ttf";
                case "eot":
                    return "application/vnd.ms-fontobject";
                case "svg":
                    return "image/svg+xml";
                default:
                    return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
            }
        }
        return null;
    }

    public WebResourceResponse loadFileFromAssets(String url, String file) throws IOException {
        String mimeType = getMimeType(url);
        String encoding = "UTF-8";
        InputStream inputStream = assetManager.open(file);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            int statusCode = HttpURLConnection.HTTP_OK;
            String reasonPhase = "OK";
            Map<String, String> responseHeaders = new HashMap<>();
            responseHeaders.put("Access-Control-Allow-Origin", "*");
            return new WebResourceResponse(mimeType, encoding, statusCode, reasonPhase, responseHeaders, inputStream);
        } else {
            return new WebResourceResponse(mimeType, encoding, inputStream);
        }
    }

    private WebViewClient webViewClient = new WebViewClient() {

        @SuppressWarnings("deprecation")
        @Override
        public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
            Uri uri = Uri.parse(url);
            if (uri.getHost().equals(serverUri.getHost())) {
                String path = uri.getPath();
                if (!path.startsWith("/api")) {
                    if (path.equals("/")) {
                        path = "/release.html";
                    }
                    try {
                        return loadFileFromAssets(url, "app/" + version + path);
                    } catch (IOException e) {
                        return null;
                    }
                }
            } else if (uri.getHost().equals("cdnjs.cloudflare.com")) {
                String path = uri.getPath().substring("/ajax/libs".length());
                try {
                    return loadFileFromAssets(url, "cdnjs" + path);
                } catch (IOException e) {
                    return null;
                }
            }
            return null;
        }

    };

}