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package org.glassfish.jersey.examples.shortener.webapp.resource;

import java.util.Collections;

import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.UriInfo;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;

import org.glassfish.jersey.examples.shortener.webapp.domain.ShortenedLink;
import org.glassfish.jersey.examples.shortener.webapp.service.ShortenerService;
import org.glassfish.jersey.examples.shortener.webapp.validation.ShortenLink;
import org.glassfish.jersey.server.mvc.ErrorTemplate;
import org.glassfish.jersey.server.mvc.Template;
import org.glassfish.jersey.server.mvc.Viewable;

/**
 * Resource responsible of providing a form to create shortened link (see {@link #form()}) and shortening posted link
 * (see {@link #createLink(String)}). Client is shown {@code error-404} page if the provided link is
 * not valid (see {@link ErrorTemplate} and {@link ShortenLink}).
 *
 * @author Michal Gajdos
 */
@Path("/")
public class ShortenerResource {

    @NotNull
    @Context
    private UriInfo uriInfo;

    @GET
    @Produces("text/html")
    public Viewable form() {
        return new Viewable("/form",
                Collections.singletonMap("greeting", "Link Shortener"));
    }

    @POST
    @Produces("text/html")
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Template(name = "/short-link")
    @ErrorTemplate(name = "/error-form")
    @Valid
    public ShortenedLink createLink(@ShortenLink @FormParam("link") final String link) {
        return ShortenerService.shortenLink(uriInfo.getBaseUri(), link);
    }
}
