/*
 * 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.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
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.ValueCallback;
import android.webkit.WebChromeClient;
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 final static int REQUEST_FILE_CHOOSER = 1;

    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);
        getWebView().setWebChromeClient(webChromeClient);

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

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

        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);
            String host = uri.getHost();
            if (host != null && host.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;
        }

    };

    private ValueCallback<Uri> openFileCallback;
    private ValueCallback<Uri[]> openFileCallback2;

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_FILE_CHOOSER) {
            Uri result = data == null || resultCode != Activity.RESULT_OK ? null : data.getData();
            if (openFileCallback != null) {
                openFileCallback.onReceiveValue(result);
                openFileCallback = null;
            }
            if (openFileCallback2 != null) {
                openFileCallback2.onReceiveValue(result != null ? new Uri[] { result } : new Uri[0]);
                openFileCallback2 = null;
            }
        }
    }

    private WebChromeClient webChromeClient = new WebChromeClient() {

        // Android 3.0+
        public void openFileChooser(ValueCallback uploadMessage, String acceptType) {
            openFileChooser(uploadMessage);
        }

        // Android 4.1+
        protected void openFileChooser(ValueCallback<Uri> uploadMessage, String acceptType, String capture) {
            openFileChooser(uploadMessage);
        }

        protected void openFileChooser(ValueCallback<Uri> uploadMessage) {
            MainFragment.this.openFileCallback = uploadMessage;
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            intent.setType("*/*");
            startActivityForResult(Intent.createChooser(intent, getString(R.string.file_browser)), REQUEST_FILE_CHOOSER);
        }

        // Android 5.0+
        public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
            if (openFileCallback2 != null) {
                openFileCallback2.onReceiveValue(null);
                openFileCallback2 = null;
            }

            openFileCallback2 = filePathCallback;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                Intent intent = fileChooserParams.createIntent();
                try {
                    startActivityForResult(intent, REQUEST_FILE_CHOOSER);
                } catch (ActivityNotFoundException e) {
                    openFileCallback2 = null;
                    return false;
                }
            }
            return true;
        }

    };

}