// Copyright (C) 2014 The Android Open Source Project
//
// 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 com.googlesource.gerrit.plugins.quota;

import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.project.CreateProjectArgs;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.validators.ProjectCreationValidationListener;
import com.google.gerrit.server.validators.ValidationException;
import com.google.inject.Inject;
import com.google.inject.Singleton;

@Singleton
public class MaxRepositoriesQuotaValidator implements
    ProjectCreationValidationListener {
  private final QuotaFinder quotaFinder;
  private final ProjectCache projectCache;

  @Inject
  MaxRepositoriesQuotaValidator(QuotaFinder quotaFinder,
      ProjectCache projectCache) {
    this.quotaFinder = quotaFinder;
    this.projectCache = projectCache;
  }

  @Override
  public void validateNewProject(CreateProjectArgs args) throws ValidationException {
    QuotaSection quotaSection = quotaFinder.firstMatching(args.getProject());
    if (quotaSection != null) {
      Integer maxProjects = quotaSection.getMaxProjects();
      if (maxProjects != null) {
        int count = 0;
        for (Project.NameKey p : projectCache.all()) {
          if (quotaSection.matches(p)) {
            count++;
          }
        }
        if (count >= maxProjects) {
          StringBuilder msg = new StringBuilder();
          msg.append("Project cannot be created because a quota for the namespace '");
          msg.append(quotaSection.getNamespace());
          msg.append("' allows at most ");
          msg.append(maxProjects);
          msg.append(" projects and ");
          msg.append(count);
          msg.append(" projects already exist.");
          throw new ValidationException(msg.toString());
        }
      }
    }
  }
}