package model;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONObject;

import Classes.ApiCall;
import Classes.Event;
import Interfaces.Callback;
import Interfaces.EventObserver;
import Interfaces.Observable;
import javafx.util.Pair;

public class DictionaryModel implements Observable {
	
	private HashMap<String,EventObserver> observers;
	private static DictionaryModel instance;
	private ArrayList<Pair<WordTraductionModel,WordTraductionModel>> translations;
	private ArrayList<Pair<WordTraductionModel,WordTraductionModel>> usages;
	
	private DictionaryModel() {
		this.observers = new HashMap<String,EventObserver>();
	}

	public static DictionaryModel getInstance() {
		if(DictionaryModel.instance == null) {
			DictionaryModel.instance = new DictionaryModel();
		}

		return DictionaryModel.instance;
	}
	
	public void query(String search) {
		
		//si recherche vide
			if(search.isEmpty()) {
				this.translations = new ArrayList<Pair<WordTraductionModel,WordTraductionModel>>();
				this.usages = new ArrayList<Pair<WordTraductionModel,WordTraductionModel>>();
				this.notifyObservers(new Event("DictionaryModel","WordQuerySuccess"));
				return;
			}
		
		final String encodedQuery;
		try {
			encodedQuery = java.net.URLEncoder.encode(search,"UTF-8");
		} catch (UnsupportedEncodingException e1) {
			this.notifyObservers(new Event("DictionaryModel","WordQueryFailed"));
			return;
		}
		
		HashMap<String,String> headers = new HashMap<String,String>();
		//si on ne met pas ce header l'API refuse de répondre
		headers.put("Referer", "http://www.wordreference.com");
		
		String dic = LangModel.getInstance().getFromLang().name()+LangModel.getInstance().getToLang().name();
		
		ApiCall call = new ApiCall("http://api.wordreference.com/1/json/"+dic+"/"+encodedQuery,"GET",new Callback() {

			@Override
			public void onSuccess(JSONObject response) {
				
				try {
					
					//on reset le contenu du modele
					DictionaryModel.this.translations = new ArrayList<Pair<WordTraductionModel,WordTraductionModel>>();
					DictionaryModel.this.usages = new ArrayList<Pair<WordTraductionModel,WordTraductionModel>>();
					
					if(response.has("Error")) {
						//pas de résultat
						DictionaryModel.this.notifyObservers(new Event("DictionaryModel","WordQueryFailed"));
					}else{
						//Traitement des traductions principales
						DictionaryModel.this.translations.addAll(
								DictionaryModel.this.computeJSON(
										response.getJSONObject("term0").getJSONObject("PrincipalTranslations")
										)
								);
						//Traitement des traductions secondaires
						if(response.getJSONObject("term0").has("AdditionalTranslations")) {
							DictionaryModel.this.translations.addAll(
									DictionaryModel.this.computeJSON(
											response.getJSONObject("term0").getJSONObject("AdditionalTranslations")
											)
									);
						}
						
						//traitement des usages
						DictionaryModel.this.usages.addAll(
								DictionaryModel.this.computeJSON(
										response.getJSONObject("original").getJSONObject("Compounds")
										)
								);
						
						DictionaryModel.this.notifyObservers(new Event("DictionaryModel","WordQuerySuccess"));
						
					}
					
				}catch(Exception e) {
					e.printStackTrace();
				}

			}

			@Override
			public void onError() {
				DictionaryModel.this.notifyObservers(new Event("DictionaryModel","WordQueryFailed"));
			}
			
		});
		call.addHeaders(headers);
		call.send();
	}
	
	private ArrayList<Pair<WordTraductionModel,WordTraductionModel>> computeJSON(JSONObject container){
		ArrayList<Pair<WordTraductionModel,WordTraductionModel>> returned = new ArrayList<Pair<WordTraductionModel,WordTraductionModel>>();
		for (Object key : container.keySet()) {
			//get original term
			WordTraductionModel term = new WordTraductionModel();
			JSONObject jterm = container.getJSONObject((String)key).getJSONObject("OriginalTerm");
			term.setWord(jterm.getString("term"))
			.setPOS(jterm.getString("POS"))
			.setSense(jterm.getString("sense"))
			.setUsage(jterm.getString("term"));
			
			//get traduction
			WordTraductionModel trad = new WordTraductionModel();
			jterm = container.getJSONObject((String)key).getJSONObject("FirstTranslation");
			term.setWord(jterm.getString("term"))
			.setPOS(jterm.getString("POS"))
			.setSense(jterm.getString("sense"))
			.setUsage(jterm.getString("term"));
			
			returned.add(new Pair<WordTraductionModel,WordTraductionModel>(term,trad));
		}
		
		return returned;
	}
	
	public ArrayList<Pair<WordTraductionModel,WordTraductionModel>> getTranslations(){
		return this.translations;
	}
	
	public ArrayList<Pair<WordTraductionModel,WordTraductionModel>> getUsages(){
		return this.usages;
	}


	@Override
	public void addObserver(String key, EventObserver o) {
		this.observers.put(key, o);

	}

	@Override
	public void removeObserver(String key) {
		this.observers.remove(key);
		
	}

	@Override
	public void notifyObservers(Event e) {
		for(Object key : this.observers.keySet().toArray()) {
			this.observers.get(key).handleEvent(e);
		}
	}

	
}