package utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.SocketException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;

/**
* Last Updated: 20-November-2018
* @author Tyler Wible
* @since 20-November-2018
*/
public class WebPageUtils {
    /**
     * Opens a web connection to USGS and returns the contents of a REST/url search for the specified url
     * @param searchUrl  a formatted url for requested USGS data
     * @return an ArrayList containing the results of the web service search for flow data using the above inputs
     * @throws IOException
     */
    public static ArrayList<String> downloadWebpage(String searchUrl) throws IOException {
        //Open the provided website
        URL webpage = new URL(searchUrl);
        URLConnection yc = webpage.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
            
        //Read out all of the webpage out into an ArrayList<String>
        ArrayList<String> pageData = new ArrayList<>();
        String inputLine;

        while((inputLine = in.readLine()) != null){
            pageData.add(inputLine);
        }
        in.close();
        return pageData;
    }
    
    /**
     * Opens a web connection to the specified URL and returns the contents of a REST/url search for the specified url
     * @param searchUrl  a formatted url for requested data
     * @return an ArrayList containing the results of the web service search for flow data using the above inputs
     * @throws IOException
     */
    public static ArrayList<String> downloadWebpage_slowData(String searchUrl) throws IOException {
        //Open the provided website
        URL webpage = new URL(searchUrl);
        URLConnection yc = webpage.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
        
        //Read out all of the webpage out into an ArrayList<String>
        ArrayList<String> pageData = new ArrayList<>();
        boolean moreLines = true;
        while(moreLines){
            try{
                String inputLine = in.readLine();
                if(inputLine != null){
                    pageData.add(inputLine);
                }else{
                    moreLines = false;
                }
            }catch(SocketException e){
                //There was an issue with the webpage, so quit out
                moreLines = false;
            }
        }
        in.close();
        
        return pageData;
    }
}