package com.xdy.hybird;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.http.SslError;
import android.os.Build;
import android.os.Looper;
import android.os.SystemClock;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.webkit.SslErrorHandler;
import android.webkit.ValueCallback;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author 蒋洪波
 * @file BridgeWebView.java
 * @brief 自定义webview可与JS互相访问的框架
 * @date 2017/7/15
 * Copyright (c) 2017, 北京球友圈网络科技有限责任公司
 * All rights reserved.
 */
@SuppressLint("SetJavaScriptEnabled")
public class BridgeWebView extends WebView implements WebViewJavascriptBridge {

    //! TAG标签
    private final String TAG = "BridgeWebView";
    String toLoadJs = "WebViewJavascriptBridge.js";
    Map<String, CallBackFunction> responseCallbacks = new HashMap<String, CallBackFunction>();
    Map<String, BridgeHandler> messageHandlers = new HashMap<String, BridgeHandler>();
    BridgeHandler defaultHandler = new DefaultHandler();

    List<Message> startupMessage = new ArrayList<Message>();
    long uniqueId = 0;
    private Context mContext;

    public BridgeWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public BridgeWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    public BridgeWebView(Context context) {
        super(context);
        init(context);
    }

    /**
     * @param handler default handler,handle messages send by js without assigned handler name,
     *                if js message has handler name, it will be handled by named handlers registered by native
     */
    public void setDefaultHandler(BridgeHandler handler) {
        this.defaultHandler = handler;
    }

    private void init(Context ctx) {
        this.mContext = ctx;
        this.setVerticalScrollBarEnabled(false);
        this.setHorizontalScrollBarEnabled(false);
        this.getSettings().setJavaScriptEnabled(true);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            WebView.setWebContentsDebuggingEnabled(false);//该false
        }

        /**
         *  Webview在安卓5.0之前默认允许其加载混合网络协议内容
         *  在安卓5.0之后，默认不允许加载http与https混合内容，需要设置webview允许其加载混合网络协议内容
         */
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
        }

        this.setWebViewClient(new BridgeWebViewClient());
    }

    /**
     * @param url
     * @brief 把数据传递回java
     */
    private void handlerReturnData(String url) {
        String functionName = BridgeUtil.getFunctionFromReturnUrl(url);
        CallBackFunction f = responseCallbacks.get(functionName);
        String data = BridgeUtil.getDataFromReturnUrl(url);
        if (f != null) {
            f.onCallBack(data);
            responseCallbacks.remove(functionName);
            return;
        }
    }

    class BridgeWebViewClient extends WebViewClient {


        //add by 张志强  为了兼容加载https的链接
        @Override
        public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
            handler.proceed();//接受所有证书
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            try {
                url = URLDecoder.decode(url, "UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

            if (url.startsWith(BridgeUtil.YY_RETURN_DATA)) { // 如果是返回数据
                handlerReturnData(url);
                return true;
            } else if (url.startsWith(BridgeUtil.YY_OVERRIDE_SCHEMA)) { //
                flushMessageQueue();
                return true;
            } else {
                return super.shouldOverrideUrlLoading(view, url);
            }
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);

            if (toLoadJs != null) {
                BridgeUtil.webViewLoadLocalJs(view, toLoadJs);
            }

            if (startupMessage != null) {
                for (Message m : startupMessage) {
                    dispatchMessage(m);
                }
                startupMessage = null;
            }

            /*后面增加的，因为4.4以上系统在onPageFinished时再恢复图片加载时,如果存在多张图片引用的是相同的src时，
            会只有一个image标签得到加载，因而对于这样的系统我们就先直接加载。
             */
            if (getSettings().getLoadsImagesAutomatically()) {
                getSettings().setLoadsImagesAutomatically(true);
            }
        }

        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            super.onReceivedError(view, errorCode, description, failingUrl);
            Log.i(TAG, errorCode + "errorcode");
            if (BridgeWebView.this.errorListener != null)
                BridgeWebView.this.errorListener.onReceivedError(errorCode, description, failingUrl);
        }

        @Override
        public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
            super.onReceivedError(view, request, error);
        }

    }

    @Override
    public void send(String data) {
        send(data, null);
    }

    @Override
    public void send(String data, CallBackFunction responseCallback) {
        doSend(null, data, responseCallback);
    }

    private void doSend(String handlerName, String data, CallBackFunction responseCallback) {
        Message m = new Message();
        if (!TextUtils.isEmpty(data)) {
            m.setData(data);
        }
        if (responseCallback != null) {
            String callbackStr = String.format(BridgeUtil.CALLBACK_ID_FORMAT, ++uniqueId + (BridgeUtil.UNDERLINE_STR + SystemClock.currentThreadTimeMillis()));
            responseCallbacks.put(callbackStr, responseCallback);
            m.setCallbackId(callbackStr);
        }
        if (!TextUtils.isEmpty(handlerName)) {
            m.setHandlerName(handlerName);
        }
        queueMessage(m);
    }

    private void queueMessage(Message m) {
        if (startupMessage != null) {
            startupMessage.add(m);
        } else {
            dispatchMessage(m);
        }
    }

    private void dispatchMessage(Message m) {
        String messageJson = m.toJson();
        //escape special characters for json string
        messageJson = messageJson.replaceAll("(\\\\)([^utrn])", "\\\\\\\\$1$2");
        messageJson = messageJson.replaceAll("(?<=[^\\\\])(\")", "\\\\\"");
        String javascriptCommand = String.format(BridgeUtil.JS_HANDLE_MESSAGE_FROM_JAVA, messageJson);
        if (Thread.currentThread() == Looper.getMainLooper().getThread()) {
            this.loadUrl(javascriptCommand);
        }
    }

    public void flushMessageQueue() {
        if (Thread.currentThread() == Looper.getMainLooper().getThread()) {
            loadUrl(BridgeUtil.JS_FETCH_QUEUE_FROM_JAVA, new CallBackFunction() {

                @Override
                public void onCallBack(String data) {
                    // deserializeMessage
                    List<Message> list = null;
                    try {
                        list = Message.toArrayList(data);
                    } catch (Exception e) {
                        e.printStackTrace();
                        return;
                    }
                    if (list == null || list.size() == 0) {
                        return;
                    }
                    for (int i = 0; i < list.size(); i++) {
                        Message m = list.get(i);
                        String responseId = m.getResponseId();
                        // 是否是response
                        if (!TextUtils.isEmpty(responseId)) {
                            CallBackFunction function = responseCallbacks.get(responseId);
                            String responseData = m.getResponseData();
                            function.onCallBack(responseData);
                            responseCallbacks.remove(responseId);
                        } else {
                            CallBackFunction responseFunction = null;
                            // if had callbackId
                            final String callbackId = m.getCallbackId();
                            if (!TextUtils.isEmpty(callbackId)) {
                                responseFunction = new CallBackFunction() {
                                    @Override
                                    public void onCallBack(String data) {
                                        Message responseMsg = new Message();
                                        responseMsg.setResponseId(callbackId);
                                        responseMsg.setResponseData(data);
                                        queueMessage(responseMsg);
                                    }
                                };
                            } else {
                                responseFunction = new CallBackFunction() {
                                    @Override
                                    public void onCallBack(String data) {
                                        // do nothing
                                    }
                                };
                            }
                            BridgeHandler handler;
                            if (!TextUtils.isEmpty(m.getHandlerName())) {
                                handler = messageHandlers.get(m.getHandlerName());
                            } else {
                                handler = defaultHandler;
                            }
                            if (handler != null)//此处判空，无方法时不执行
                                handler.handler(m.getData(), responseFunction);
                        }
                    }
                }
            });
        }
    }

    public void loadUrl(String jsUrl, CallBackFunction returnCallback) {
        this.loadUrl(jsUrl);
        responseCallbacks.put(BridgeUtil.parseFunctionName(jsUrl), returnCallback);
    }

    /**
     * 通过原生API执行JS方法,同步方法使用
     * @param jsParams       方法体内参数
     * @param returnCallback
     */
    public void loadUrlWithNativeApi(String jsParams, ValueCallback<String> returnCallback) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            evaluateJavascript(BridgeUtil.loadJs(jsParams), returnCallback);
        }
    }

    /**
     * 通过原生API执行JS方法,异步方法使用
     * @param jsParams 方法体内参数
     */
    public void loadUrlWithNativeApi(String jsParams) {
        loadUrl(BridgeUtil.loadJs(jsParams));
    }


    /**
     * register handler,so that javascript can call it
     * @param handlerName
     * @param handler
     */
    public void registerHandler(String handlerName, BridgeHandler handler) {
        if (handler != null) {
            messageHandlers.put(handlerName, handler);
        }
    }

    /**
     * @param handlerName
     * @param data
     * @param callBack
     * @brief call javascript registered handler
     */
    public void callHandler(String handlerName, String data, CallBackFunction callBack) {
        doSend(handlerName, data, callBack);
    }

    private OnReceivedErrorListener errorListener;

    public void setOnReceivedErrorListener(OnReceivedErrorListener listener) {
        this.errorListener = listener;
    }

    public interface OnReceivedErrorListener {
        public void onReceivedError(int errorCode, String description, String failingUrl);
    }
}