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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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.fabric8.kubernetes.client.internal;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
import io.fabric8.kubernetes.api.model.AuthInfo;
import io.fabric8.kubernetes.api.model.Cluster;
import io.fabric8.kubernetes.api.model.Config;
import io.fabric8.kubernetes.api.model.Context;
import io.fabric8.kubernetes.api.model.NamedAuthInfo;
import io.fabric8.kubernetes.api.model.NamedCluster;
import io.fabric8.kubernetes.api.model.NamedContext;

import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * Helper class for working with the YAML config file thats located in
 * ~/.kube/config which is updated when you use commands
 * like osc login and osc project myproject
 */
public class KubeConfigUtils {
  public static Config parseConfig(File file) throws IOException {
    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
    return mapper.readValue(file, Config.class);
  }

  /**
   * Returns the current context in the given config
   */
  public static Context getCurrentContext(Config config) {
    String contextName = config.getCurrentContext();
    if (contextName != null) {
      List contexts = config.getContexts();
      if (contexts != null) {
        for (NamedContext context : contexts) {
          if (contextName.equals(context.getName())) {
            return context.getContext();
          }
        }
      }
    }
    return null;
  }

  /**
   * Returns the current user token for the config and current context
   */
  public static String getUserToken(Config config, Context context) {
    AuthInfo authInfo = getUserAuthInfo(config, context);
    if (authInfo != null) {
      return authInfo.getToken();
    }
    return null;
  }

  /**
   * Returns the current {@link AuthInfo} for the current context and user
   */
  public static AuthInfo getUserAuthInfo(Config config, Context context) {
    AuthInfo authInfo = null;
    if (config != null && context != null) {
      String user = context.getUser();
      if (user != null) {
        List users = config.getUsers();
        if (users != null) {
          for (NamedAuthInfo namedAuthInfo : users) {
            if (user.equals(namedAuthInfo.getName())) {
              authInfo = namedAuthInfo.getUser();
            }
          }
        }
      }
    }
    return authInfo;
  }

  /**
   * Returns the current {@link Cluster} for the current context
   */
  public static Cluster getCluster(Config config, Context context) {
    Cluster cluster = null;
    if (config != null && context != null) {
      String clusterName = context.getCluster();
      if (clusterName != null) {
        List clusters = config.getClusters();
        if (clusters != null) {
          for (NamedCluster namedCluster : clusters) {
            if (clusterName.equals(namedCluster.getName())) {
              cluster = namedCluster.getCluster();
            }
          }
        }
      }
    }
    return cluster;
  }
}