/*
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Tango - Personal Media Center
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Copyright (C) 2021 Ulrich Hilger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package de.uhilger.tango.api;
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import com.google.gson.Gson;
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import com.sun.net.httpserver.HttpExchange;
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import de.uhilger.tango.App;
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import de.uhilger.tango.Server;
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import de.uhilger.tango.entity.Abspielliste;
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import de.uhilger.tango.entity.Entity;
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import de.uhilger.tango.entity.Titel;
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import de.uhilger.tango.store.FileStorage;
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import java.io.IOException;
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import java.util.logging.Logger;
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/**
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* Der ListHandler bearbeitet HTTP-Anfragen zu Abspiellisten
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*
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* GET /mz/api/alist/[pl-name] die Titel-Objekte der Liste [pl-name] liefern
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* PUT /mz/api/alist/[pl-name] den Titel im Body anfuegen an die Liste [pl-name]
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* PUT /mz/api/alist/[pl-name]/[nr] an der Position nr der Liste [pl-name] den Titel im Body einfuegen
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* Neu: PUT /mz/api/alist/[pl-name]/[nr]/up den Titel an der Position nr der Liste [pl-name] eins nach oben
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* Neu: PUT /mz/api/alist/[pl-name]/[nr]/dn den Titel an der Position nr der Liste [pl-name] eins nach unten
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* DELETE /mz/api/alist/[pl-name]/[nr] den Titel an der Position [nr] aus der Liste [pl-name] entfernen
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* DELETE /mz/api/alist/[pl-name]/alle alle Titel aus der Liste [pl-name] entfernen
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*
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* TODO (2.1.2023):
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* - Titel eins nach oben/unten
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* - Liste ab Titel spielen
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* - Ganzes Album der Liste hinzufuegen
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*
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* @author Ulrich Hilger
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* @version 1, 8.4.2021
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*/
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public class ListHandler extends AbstractHandler {
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private static final Logger logger = Logger.getLogger(ListHandler.class.getName());
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public static final String ALLE_TITEL = "alle";
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private String conf;
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public ListHandler(String conf) {
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this.conf = conf;
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}
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@Override
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protected String get(HttpExchange e) {
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String path = e.getRequestURI().toString();
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String[] elems = path.split(Server.SLASH);
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String plname = elems[elems.length - 1];
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FileStorage fs = new FileStorage(conf);
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String json = fs.readJson(FileStorage.ST_ABSPIELLISTE, plname);
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return embedInCustomType(json, FileStorage.ST_ABSPIELLISTE);
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}
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@Override
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protected String put(HttpExchange e) throws IOException {
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String path = e.getRequestURI().toString();
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String[] elems = path.split(Server.SLASH);
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String response = "ListHandler.put: ungueltiger URL";
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switch(elems.length) {
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case 5: // ohne nr am Ende
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response = addTitel(e, elems[4]);
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break;
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case 6:
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response = "Einfuegen noch nicht fertig.";
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break;
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}
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return response;
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}
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private String addTitel(HttpExchange e, String plname) throws IOException {
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FileStorage fs = new FileStorage(conf);
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Entity entity = fs.read(FileStorage.ST_ABSPIELLISTE, plname);
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String response = "Titel konnte nicht hinzugefuegt werden.";
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if(entity instanceof Abspielliste) {
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Abspielliste aliste = (Abspielliste) entity;
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String titelJson = bodyLesen(e);
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Gson gson = new Gson();
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Object o = gson.fromJson(titelJson, fs.typeFromName(Titel.class.getSimpleName()).getType());
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if(o instanceof Titel) {
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Titel titel = (Titel) o;
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aliste.addTitel(titel);
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fs.write(aliste, true);
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response = "Titel " + titel.getName() + " der Liste " + aliste.getName() + " hinzugefuegt.";
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}
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}
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return response;
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}
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@Override
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protected String post(HttpExchange e) {
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throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
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}
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// DELETE /mz/api/alist/[pl-name]/[nr] den Titel an der Position [nr] aus der Liste [pl-name] entfernen
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@Override
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protected boolean delete(HttpExchange e) {
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String path = e.getRequestURI().toString();
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String[] elems = path.split(Server.SLASH);
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String listName = elems[elems.length - 2];
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FileStorage fs = new FileStorage(conf);
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Entity entity = fs.read(Abspielliste.class.getSimpleName(), listName);
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if(entity instanceof Abspielliste) {
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Abspielliste liste = (Abspielliste) entity;
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String titelStr = elems[elems.length-1];
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if(titelStr.equalsIgnoreCase(ALLE_TITEL)) {
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liste.getTitel().clear();
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} else {
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liste.getTitel().remove(Integer.parseInt(elems[elems.length-1]));
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}
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fs.write(liste, true);
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return true;
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} else {
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return false;
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}
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}
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}
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