// Copyright 2017 The Nomulus Authors. All Rights Reserved.
//
// 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 google.registry.tools;

import static com.google.common.base.Preconditions.checkState;

import com.google.common.base.Ascii;
import com.google.common.base.Strings;
import com.googlecode.objectify.Key;
import google.registry.model.EppResource;
import google.registry.model.contact.ContactResource;
import google.registry.model.domain.DomainBase;
import google.registry.model.host.HostResource;
import google.registry.model.index.ForeignKeyIndex;
import org.joda.time.DateTime;

/** Container class for static utility methods. */
class CommandUtilities {

  /** A useful parameter enum for commands that operate on {@link EppResource} objects. */
  public enum ResourceType {
    CONTACT(ContactResource.class),
    HOST(HostResource.class),
    DOMAIN(DomainBase.class);

    private final Class<? extends EppResource> clazz;

    ResourceType(Class<? extends EppResource> clazz) {
      this.clazz = clazz;
    }

    public Key<? extends EppResource> getKey(String uniqueId, DateTime now) {
      return ForeignKeyIndex.loadAndGetKey(clazz, uniqueId, now);
    }
  }

  static String addHeader(String header, String body) {
    return String.format("%s:\n%s\n%s", header, Strings.repeat("-", header.length() + 1), body);
  }

  /** Prompts for yes/no input using promptText, defaulting to no. */
  static boolean promptForYes(String promptText) {
    checkState(
        System.console() != null, "Unable to access stdin (are you running with bazel run?)");
    String input = System.console().readLine(promptText + " (y/N): ");
    // Null represents end-of-file (e.g. ^-D) so interpret that as a negative response.
    return input != null && Ascii.toUpperCase(input).startsWith("Y");
  }
}
