import android.os.Handler;
import android.os.Looper;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import
 
 okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

/**
 * Created by fan on 2016/11/9.
 * 使用時匯入依賴包：
 *  compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
 *  compile 'com.squareup.okhttp3:okhttp:3.4.2'
 */

public class OkHttp
 
 {

    /**
     * 靜態例項
     */
    private static OkHttp sOkHttpManager;

    /**
     * okhttpclient例項
     */
    private OkHttpClient mClient;

    /**
     * 因為我們請求資料一般都是子執行緒中請求，在這裡我們使用了handler
     */
    private Handler mHandler;

    /**
     * 構造方法
     */
    private OkHttp() {
        // 可以通過實現 Logger 介面更改日誌儲存位置
 

        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

//        mClient = new OkHttpClient.Builder().addInterceptor(loggingInterceptor).build();
        mClient = new OkHttpClient();
        /**
         * 在這裡直接設定連線超時.讀取超時，寫入超時
         */

        OkHttpClient.Builder builder = mClient.newBuilder();
        builder.connectTimeout(10, TimeUnit.SECONDS);
        builder.readTimeout(10, TimeUnit.SECONDS);
        builder.writeTimeout(10, TimeUnit.SECONDS);
        builder.addInterceptor(loggingInterceptor);
        mClient = builder.build();

        /**
         * 如果是用的3.0之前的版本  使用以下直接設定連線超時.讀取超時，寫入超時
         */

        //client.setConnectTimeout(10, TimeUnit.SECONDS);
        //client.setWriteTimeout(10, TimeUnit.SECONDS);
        //client.setReadTimeout(30, TimeUnit.SECONDS);


        /**
         * 初始化handler
         */
        mHandler = new Handler(Looper.getMainLooper());
    }


    /**
     * 單例模式  獲取OkHttp例項
     *
     * @return
     */
    public static OkHttp getInstance() {

        if (sOkHttpManager == null) {
            sOkHttpManager = new OkHttp();
        }
        return sOkHttpManager;
    }

    //-------------------------同步的方式請求資料--------------------------

    /**
     * 對外提供的get方法,同步的方式
     *
     * @param url 傳入的地址
     * @return
     */
    public static Response getSync(String url) {

        //通過獲取到的例項來呼叫內部方法
        return sOkHttpManager.inner_getSync(url);
    }

    /**
     * GET方式請求的內部邏輯處理方式，同步的方式
     *
     * @param url
     * @return
     */
    private Response inner_getSync(String url) {
        Request request = new Request.Builder().url(url).build();
        Response response = null;
        try {
            //同步請求返回的是response物件
            response = mClient.newCall(request).execute();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return response;
    }

    /**
     * 對外提供的同步獲取String的方法
     *
     * @param url
     * @return
     */
    public static String getSyncString(String url) {
        return sOkHttpManager.inner_getSyncString(url);
    }


    /**
     * 同步方法
     */
    private String inner_getSyncString(String url) {
        String result = null;
        try {
            /**
             * 把取得到的結果轉為字串，這裡最好用string()
             */
            result = inner_getSync(url).body().string();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    //-------------------------非同步的方式請求資料--------------------------
    public static void getAsync(String url, DataCallBack callBack) {
        getInstance().inner_getAsync(url, callBack);
    }

    /**
     * 內部邏輯請求的方法
     *
     * @param url
     * @param callBack
     * @return
     */
    private void inner_getAsync(String url, final DataCallBack callBack) {
        final Request request = new Request.Builder().url(url).build();

        mClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                deliverDataFailure(request, e, callBack);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String result = null;
                try {
                    result = response.body().string();
                } catch (IOException e) {
                    deliverDataFailure(request, e, callBack);
                }
                deliverDataSuccess(result, callBack);
            }
        });
    }


    /**
     * 分發失敗的時候呼叫
     *
     * @param request
     * @param e
     * @param callBack
     */
    private void deliverDataFailure(final Request request, final IOException e, final DataCallBack callBack) {
        /**
         * 在這裡使用非同步處理
         */
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                if (callBack != null) {
                    callBack.requestFailure(request, e);
                }
            }
        });
    }

    /**
     * 分發成功的時候呼叫
     *
     * @param result
     * @param callBack
     */
    private void deliverDataSuccess(final String result, final DataCallBack callBack) {
        /**
         * 在這裡使用非同步執行緒處理
         */
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                if (callBack != null) {
                    try {
                        callBack.requestSuccess(result);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        });
    }

    /**
     * 資料回撥介面
     */
    public interface DataCallBack {
        void requestFailure(Request request, IOException e);

        void requestSuccess(String result) throws Exception;
    }

    //-------------------------提交表單--------------------------

    public static void postAsync(String url, Map<String, String> params, DataCallBack callBack) {
        getInstance().inner_postAsync(url, params, callBack);
    }

    private void inner_postAsync(String url, Map<String, String> params, final DataCallBack callBack) {

        RequestBody requestBody = null;
        if (params == null) {
            params = new HashMap<>();
        }

        /**
         * 如果是3.0之前版本的，構建表單資料是下面的一句
         */
        //FormEncodingBuilder builder = new FormEncodingBuilder();

        /**
         * 3.0之後版本
         */
        FormBody.Builder builder = new FormBody.Builder();

        /**
         * 在這對新增的引數進行遍歷，map遍歷有四種方式，如果想要了解的可以網上查詢
         */
        for (Map.Entry<String, String> map : params.entrySet()) {
            String key = map.getKey().toString();
            String value = null;
            /**
             * 判斷值是否是空的
             */
            if (map.getValue() == null) {
                value = "";
            } else {
                value = map.getValue();
            }
            /**
             * 把key和value新增到formbody中
             */
            builder.add(key, value);
        }
        requestBody = builder.build();
        //結果返回
        // 請求物件
        final Request request = new Request.Builder().url(url).post(requestBody).build();
        mClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                deliverDataFailure(request, e, callBack);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String result = response.body().string();
                deliverDataSuccess(result, callBack);
            }


        });
    }


    //-------------------------檔案下載--------------------------
    public static void downloadAsync(String url, String desDir, DataCallBack callBack) {
        getInstance().inner_downloadAsync(url, desDir, callBack);
    }

    /**
     * 下載檔案的內部邏輯處理類
     *
     * @param url      下載地址
     * @param desDir   目標地址
     * @param callBack
     */
    private void inner_downloadAsync(final String url, final String desDir, final DataCallBack callBack) {
        final Request request = new Request.Builder().url(url).build();
        mClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                deliverDataFailure(request, e, callBack);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                /**
                 * 在這裡進行檔案的下載處理
                 */
                InputStream inputStream = null;
                FileOutputStream fileOutputStream = null;
                try {
                    //檔名和目標地址
                    File file = new File(desDir, getFileName(url));
                    //把請求回來的response物件裝換為位元組流
                    inputStream = response.body().byteStream();
                    fileOutputStream = new FileOutputStream(file);
                    int len = 0;
                    byte[] bytes = new byte[2048];
                    //迴圈讀取資料
                    while ((len = inputStream.read(bytes)) != -1) {
                        fileOutputStream.write(bytes, 0, len);
                    }
                    //關閉檔案輸出流
                    fileOutputStream.flush();
                    //呼叫分發資料成功的方法
                    deliverDataSuccess(file.getAbsolutePath(), callBack);
                } catch (IOException e) {
                    //如果失敗，呼叫此方法
                    deliverDataFailure(request, e, callBack);
                    e.printStackTrace();
                } finally {
                    if (inputStream != null) {
                        inputStream.close();
                    }
                    if (fileOutputStream != null) {
                        fileOutputStream.close();
                    }

                }
            }

        });
    }

    /**
     * 根據檔案url獲取檔案的路徑名字
     *
     * @param url
     * @return
     */
    private String getFileName(String url) {
        int separatorIndex = url.lastIndexOf("/");
        String path = (separatorIndex < 0) ? url : url.substring(separatorIndex + 1, url.length());
        return path;
    }



}