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/**
 * Copyright (c) 2014, stateful.co
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 1) Redistributions of source code must retain the above
 * copyright notice, this list of conditions and the following
 * disclaimer. 2) Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided
 * with the distribution. 3) Neither the name of the stateful.co nor
 * the names of its contributors may be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package co.stateful;

import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Loggable;
import com.jcabi.http.Request;
import com.jcabi.http.response.RestResponse;
import com.jcabi.http.response.XmlResponse;
import com.jcabi.log.Logger;
import java.io.IOException;
import java.net.HttpURLConnection;
import lombok.EqualsAndHashCode;
import lombok.ToString;

/**
 * Counters.
 *
 * @author Yegor Bugayenko ([email protected])
 * @version $Id$
 * @since 0.1
 * @checkstyle MultipleStringLiteralsCheck (500 lines)
 */
@Immutable
@Loggable(Loggable.DEBUG)
@ToString(of = { })
@EqualsAndHashCode(of = "request")
final class RtCounters implements Counters {

    /**
     * Entry request.
     */
    private final transient Request request;

    /**
     * Ctor.
     * @param req Request
     */
    RtCounters(final Request req) {
        this.request = req;
    }

    @Override
    public Iterable names() throws IOException {
        return this.request.fetch()
            .as(RestResponse.class)
            .assertStatus(HttpURLConnection.HTTP_OK)
            .as(XmlResponse.class)
            .xml()
            .xpath("/page/counters/counter/name/text()");
    }

    @Override
    public Counter create(final String name) throws IOException {
        final long start = System.currentTimeMillis();
        this.request.fetch()
            .as(RestResponse.class)
            .assertStatus(HttpURLConnection.HTTP_OK)
            .as(XmlResponse.class)
            .rel("/page/links/link[@rel='add']/@href")
            .method(Request.POST)
            .body().formParam("name", name).back()
            .fetch()
            .as(RestResponse.class)
            .assertStatus(HttpURLConnection.HTTP_SEE_OTHER);
        Logger.info(
            this, "counter \"%s\" created in %[ms]s",
            name, System.currentTimeMillis() - start
        );
        return this.get(name);
    }

    @Override
    public void delete(final String name) throws IOException {
        final long start = System.currentTimeMillis();
        this.request.fetch()
            .as(RestResponse.class)
            .assertStatus(HttpURLConnection.HTTP_OK)
            .as(XmlResponse.class)
            .rel(
                String.format(
                    // @checkstyle LineLength (1 line)
                    "/page/counters/counter[name='%s']/links/link[@rel='delete']/@href",
                    name
                )
            )
            .uri().queryParam("name", name).back()
            .fetch()
            .as(RestResponse.class)
            .assertStatus(HttpURLConnection.HTTP_SEE_OTHER);
        Logger.info(
            this, "counter \"%s\" deleted in %[ms]s",
            name, System.currentTimeMillis() - start
        );
    }

    @Override
    public Counter get(final String name) throws IOException {
        return new RtCounter(name, this.request);
    }
}