package com.example.flickrbrowser2;

import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

enum DownloadStatus {IDLE, PROCESSING, NOT_INITIALISED, FAILED_OR_EMPTY, OK}

public class GetRawData extends AsyncTask<String, Void, String> {
    private static final String TAG = "GetRawData";
    private DownloadStatus mDownloadStatus;
    private final OnDownloadComplete mCallback;

    interface OnDownloadComplete {
        void onDownloadComplete(String data, DownloadStatus status);
    }

    public GetRawData(OnDownloadComplete Callback) {
        this.mDownloadStatus = DownloadStatus.IDLE;
        mCallback = Callback;
    }

    void runInSameThread(String s) {
        Log.d(TAG, "runInSameThread: Starts");
        if(mCallback!=null)
        {
            mCallback.onDownloadComplete(doInBackground(s),mDownloadStatus);
        }
        Log.d(TAG, "runInSameThread: ends");
    }

    @Override
    protected void onPostExecute(String s) {
        Log.d(TAG, "onPostExecute: parameter is" + s);
        if (mCallback != null) {
            mCallback.onDownloadComplete(s, mDownloadStatus);
        }
        Log.d(TAG, "onPostExecute: ends");
    }

    @Override
    protected String doInBackground(String... strings) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;
        if (strings == null) {
            mDownloadStatus = DownloadStatus.NOT_INITIALISED;
            return null;
        }
        try {
            mDownloadStatus = DownloadStatus.PROCESSING;
            URL url = new URL(strings[0]);
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            int response = connection.getResponseCode();
            Log.d(TAG, "doInBackground: the response code was" + response);
            StringBuilder result = new StringBuilder();
            reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
//String line;
//while(null!=(line= reader.readLine()))
            for (String line = reader.readLine(); null != line; line = reader.readLine()) {
                result.append(line).append("\n");
            }
            mDownloadStatus = DownloadStatus.OK;
            return result.toString();
        } catch (MalformedURLException e) {
            Log.e(TAG, "doInBackground:Invalid URL" + e.getMessage());
        } catch (IOException e) {
            Log.e(TAG, "doInBackground: " + e.getMessage());
        } catch (SecurityException e) {
            Log.e(TAG, "doInBackground: Permission required" + e.getMessage());
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    Log.e(TAG, "doInBackground: error closing reader" + e.getMessage());
                }
            }
        }
        mDownloadStatus = DownloadStatus.FAILED_OR_EMPTY;
        return null;
    }
}