/*
 * Copyright (C) 2017 Julien Viet
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package io.vertx.pgclient.impl;

import io.vertx.core.impl.CloseFuture;
import io.vertx.core.impl.ContextInternal;
import io.vertx.core.spi.metrics.ClientMetrics;
import io.vertx.core.spi.metrics.VertxMetrics;
import io.vertx.pgclient.*;
import io.vertx.sqlclient.PoolOptions;
import io.vertx.sqlclient.impl.Connection;
import io.vertx.sqlclient.impl.PoolBase;
import io.vertx.sqlclient.impl.SqlConnectionImpl;
import io.vertx.core.*;
import io.vertx.sqlclient.impl.tracing.QueryTracer;

Todo :
- handle timeout when acquiring a connection
- for per statement pooling, have several physical connection and use the less busy one to avoid head of line blocking effect
Author:
Julien Viet, Emad Alblueshi/**
 * Todo :
 *
 * - handle timeout when acquiring a connection
 * - for per statement pooling, have several physical connection and use the less busy one to avoid head of line blocking effect
 *
 * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
 * @author <a href="mailto:emad.albloushi@gmail.com">Emad Alblueshi</a>
 */
public class PgPoolImpl extends PoolBase<PgPoolImpl> implements PgPool {

  public static PgPoolImpl create(ContextInternal context, boolean closeVertx, PgConnectOptions connectOptions, PoolOptions poolOptions) {
    QueryTracer tracer = context.tracer() == null ? null : new QueryTracer(context.tracer(), connectOptions);
    VertxMetrics vertxMetrics = context.owner().metricsSPI();
    ClientMetrics metrics = vertxMetrics != null ? vertxMetrics.createClientMetrics(connectOptions.getSocketAddress(), "sql", connectOptions.getMetricsName()) : null;
    PgPoolImpl pool = new PgPoolImpl(context, new PgConnectionFactory(context, connectOptions), tracer, metrics, poolOptions);
    CloseFuture closeFuture = pool.closeFuture();
    if (closeVertx) {
      closeFuture.onComplete(ar -> context.owner().close());
    } else {
      context.addCloseHook(closeFuture);
    }
    return pool;
  }

  private final PgConnectionFactory factory;

  private PgPoolImpl(ContextInternal context, PgConnectionFactory factory, QueryTracer tracer, ClientMetrics metrics, PoolOptions poolOptions) {
    super(context, factory, tracer, metrics, poolOptions);
    this.factory = factory;
  }

  @Override
  public int appendQueryPlaceholder(StringBuilder queryBuilder, int index, int current) {
    queryBuilder.append('$').append(1 + index);
    return index;
  }

  @Override
  public void connect(Handler<AsyncResult<Connection>> completionHandler) {
    factory.connect().onComplete(completionHandler);
  }

  @Override
  protected SqlConnectionImpl wrap(ContextInternal context, Connection conn) {
    return new PgConnectionImpl(factory, context, conn, tracer, metrics);
  }
}