// TODO 1: Complete this class, look for the TODO's below.

package edu.cuny.brooklyn.web;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URISyntaxException;

import java.net.URL;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class NasaApodService {

private final static Logger LOGGER = LoggerFactory.getLogger(NasaApodService.class);

/*

* Query Parameters

* Parameter Type Default Description

* date YYYY-MM-DD today The date of the APOD image to retrieve

* hd bool False Retrieve the URL for the high resolution image

* api_key string DEMO_KEY api.nasa.gov key for expanded usage (to obtain at https://api.nasa.gov/index.html#apply-for-an-api-key)

*

* Example query

* https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY

*/

private final static String API_END_POINT = "https://api.nasa.gov/planetary/apod";

private String apiKey;

public NasaApodService(String apiKey) {

this.apiKey = apiKey;

}

public NasaApod getApod(String date, boolean highResolution) throws IOException, URISyntaxException {

// TODO 1(a): use the RequestParameterBuilder to build the query String,

// i.e. the query variable should references the value of the

// query string.

String query = "";

HttpURLConnection conn = sendHttpRequest(API_END_POINT, query);

// check the status

int status = conn.getResponseCode();

if (status != HttpURLConnection.HTTP_OK) {

logErrorMessage(conn);

throw new IllegalStateException("Server responses with " + status);

}

// get the object

NasaApod nasaApod = readNasaApod(conn);

// disconnect to release resource

conn.disconnect();

LOGGER.info("Got the NASA APOD from the service.");

return nasaApod;

}

private void logErrorMessage(HttpURLConnection conn) throws IOException {

try (BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getErrorStream()))) {

String line;

while ((line = reader.readLine()) != null) {

LOGGER.error("Line: " + line);

}

}

}

private HttpURLConnection sendHttpRequest(String apiWebResource, String query) throws IOException {

URL url = new URL(apiWebResource + "?" + query);

LOGGER.info("url: " + url.toString());

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");

return conn;

}

private NasaApod readNasaApod(HttpURLConnection conn) throws IOException, URISyntaxException {

// TODO 1(b): construct a NasaApod object from returned JSON object/array

NasaApod nasaApod = null;

return nasaApod;

}

}

// TODO 2: complete the fromJsonObject method below
	package edu.cuny.brooklyn.web;
	import java.net.URI;
	import java.net.URISyntaxException;
	import java.time.LocalDate;
	import java.time.format.DateTimeFormatter;
	import javax.json.JsonObject;
	public class NasaApod {
	/* Example:
	* {
	* "date": "2018-05-07",
	* "explanation": "Why is there a large boulder near the center of Tycho's peak? Tycho crater on the Moon is one of the easiest features to see, visible even to the unaided eye (inset, lower right). But at the center of Tycho (inset, upper left) is a something unusual -- a 120-meter boulder. This boulder was imaged at very high resolution at sunrise, over the past decade, by the Moon-circling Lunar Reconnaissance Orbiter (LRO). The leading origin hypothesis is that that the boulder was thrown during the tremendous collision that formed Tycho crater about 110 million years ago, and by chance came back down right near the center of the newly-formed central mountain. Over the next billion years meteor impacts and moonquakes should slowly degrade Tycho's center, likely causing the central boulder to tumble 2000 meters down to the crater floor and disintegrate.",
	* "hdurl": "https://apod.nasa.gov/apod/image/1805/TychoBoulder2_LRO_960.jpg",
	* "media_type": "image",
	* "service_version": "v1",
	* "title": "The Unusual Boulder at Tycho's Peak",
	* "url": "https://apod.nasa.gov/apod/image/1805/TychoBoulder2_LRO_960.jpg"
	* }
	*/
	private final static String DATE_KEY = "date";
	private final static String TITLE_KEY = "title";
	private final static String EXPLANATION_KEY = "explanation";
	private final static String MEDIA_TYPE_KEY = "media_type";
	private final static String URL_KEY = "url";
	private final static String HDURL_KEY = "hdurl";
	public final static DateTimeFormatter DATETIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
	private LocalDate date;
	private String explanantion;
	private String title;
	private URI hdPictureURI;
	private URI mediaURI;
	private String mediaType;
	public NasaApod(LocalDate date, String title, String explanation, String mediaType, URI mediaURI,
	URI hdPictureURI) {
	this.date = date;
	this.explanantion = explanation;
	this.title = title;
	this.mediaType = mediaType;
	this.mediaURI = mediaURI;
	this.hdPictureURI = hdPictureURI;
	}
	public LocalDate getDate() {
	return date;
	}
	public String getDateAsString() {
	return date.format(DATETIME_FORMATTER);
	}
	public String getExplanantion() {
	return explanantion;
	}
	public String getTitle() {
	return title;
	}
	public URI getHdPictureURI() {
	return hdPictureURI;
	}
	public URI getMediaURI() {
	return mediaURI;
	}
	public String getMediaType() {
	return mediaType;
	}
	public static NasaApod fromJsonObject(JsonObject obj) throws URISyntaxException {
	// TODO 2(a): parsing the JsonObject obj to obtain a NasaApod object. Note
	// that this method is expected to be called in the readNasaApod method
	// in the NasaApodService class
	return null;
	}
	public static String formatDate(LocalDate date) {
	return date.format(DATETIME_FORMATTER);
	}
	}