// 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.checkArgument;

import com.beust.jcommander.Parameter;
import com.beust.jcommander.Parameters;
import google.registry.model.EppResource;
import google.registry.tools.params.InstantParameter;
import google.registry.util.Clock;
import jakarta.inject.Inject;
import java.time.Instant;
import java.util.Optional;

/** Abstract command to print one or more resources to stdout. */
@Parameters(separators = " =")
abstract class GetEppResourceCommand implements Command {

  @Parameter(
      names = "--read_timestamp",
      description = "Timestamp to use when reading. May not be in the past.",
      converter = InstantParameter.class)
  protected Instant readTimestamp;

  @Parameter(
      names = "--expand",
      description = "Fully expand the requested resource. NOTE: Output may be lengthy.")
  boolean expand;

  @Inject Clock clock;

  /** Runs the command's own logic that calls {@link #printResource}. */
  abstract void runAndPrint();

  /**
   * Prints a possibly-absent resource to stdout, using resourceType and uniqueId to construct a
   * nice error message if the resource was null (i.e. doesn't exist).
   */
  void printResource(
      String resourceType, String uniqueId, Optional<? extends EppResource> resource) {
    System.out.println(
        resource.isPresent()
            ? String.format(
                "%s\n\nWebsafe key: %s",
                expand ? resource.get().toHydratedString() : resource.get(),
                resource.get().createVKey().stringify())
            : String.format("%s '%s' does not exist or is deleted\n", resourceType, uniqueId));
  }

  @Override
  public void run() {
    Instant now = clock.now();
    if (readTimestamp == null) {
      readTimestamp = now;
    }
    checkArgument(!readTimestamp.isBefore(now), "--read_timestamp may not be in the past");
    runAndPrint();
  }
}
