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package com.hubspot.mesos.client;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.core.type.TypeReference;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
import com.hubspot.horizon.HttpClient;
import com.hubspot.horizon.HttpRequest;
import com.hubspot.horizon.HttpResponse;
import com.hubspot.mesos.JavaUtils;
import com.hubspot.mesos.json.MesosMasterStateObject;
import com.hubspot.mesos.json.MesosSlaveStateObject;
import com.hubspot.mesos.json.MesosTaskMonitorObject;

@Singleton
public class MesosClient {

  public static final String HTTP_CLIENT_NAME = "mesos.http.client";

  private static final Logger LOG = LoggerFactory.getLogger(MesosClient.class);

  private static final String MASTER_STATE_FORMAT = "http://%s/master/state";
  private static final String MESOS_SLAVE_JSON_URL = "http://%s:5051/slave(1)/state";
  private static final String MESOS_SLAVE_STATISTICS_URL = "http://%s:5051/monitor/statistics";

  private static final TypeReference> TASK_MONITOR_TYPE_REFERENCE = new TypeReference>() {};

  private final HttpClient httpClient;

  @Inject
  public MesosClient(@Named(HTTP_CLIENT_NAME) HttpClient httpClient) {
    this.httpClient = httpClient;
  }

  public String getMasterUri(String hostnameAndPort) {
    return String.format(MASTER_STATE_FORMAT, hostnameAndPort);
  }

  public static class MesosClientException extends RuntimeException {
    private static final long serialVersionUID = 1L;

    public MesosClientException(String message) {
      super(message);
    }

    public MesosClientException(String message, Throwable cause) {
      super(message, cause);
    }

  }

  private HttpResponse getFromMesos(String uri) {
    HttpResponse response = null;

    final long start = System.currentTimeMillis();

    LOG.debug("Fetching {} from mesos", uri);

    try {
      response = httpClient.execute(HttpRequest.newBuilder().setUrl(uri).build());

      LOG.debug("Response {} - {} after {}", response.getStatusCode(), uri, JavaUtils.duration(start));
    } catch (Exception e) {
      throw new MesosClientException(String.format("Exception fetching %s after %s", uri, JavaUtils.duration(start)), e);
    }

    if (!response.isSuccess()) {
      throw new MesosClientException(String.format("Invalid response code from %s : %s", uri, response.getStatusCode()));
    }

    return response;
  }

  private  T getFromMesos(String uri, Class clazz) {
    HttpResponse response = getFromMesos(uri);

    try {
      return response.getAs(clazz);
    } catch (Exception e) {
      throw new MesosClientException(String.format("Couldn't deserialize %s from %s", clazz.getSimpleName(), uri), e);
    }
  }

  public MesosMasterStateObject getMasterState(String uri) {
    return getFromMesos(uri, MesosMasterStateObject.class);
  }

  public String getSlaveUri(String hostname) {
    return String.format(MESOS_SLAVE_JSON_URL, hostname);
  }

  public MesosSlaveStateObject getSlaveState(String uri) {
    return getFromMesos(uri, MesosSlaveStateObject.class);
  }

  public List getSlaveResourceUsage(String hostname) {
    final String uri = String.format(MESOS_SLAVE_STATISTICS_URL, hostname);

    HttpResponse response = getFromMesos(uri);

    try {
      return response.getAs(TASK_MONITOR_TYPE_REFERENCE);
    } catch (Exception e) {
      throw new MesosClientException(String.format("Unable to deserialize task monitor object from %s", uri), e);
    }
  }

}