// Copyright (C) 2017 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.google.gerrit.server.account;

import com.google.common.base.Strings;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.DefaultInput;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.account.PutStatus.Input;
import com.google.gwtorm.server.AtomicUpdate;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;

@Singleton
public class PutStatus implements RestModifyView<AccountResource, Input> {
  public static class Input {
    @DefaultInput String status;

    public Input(String status) {
      this.status = status;
    }

    public Input() {}
  }

  private final Provider<CurrentUser> self;
  private final Provider<ReviewDb> dbProvider;
  private final AccountCache byIdCache;

  @Inject
  PutStatus(Provider<CurrentUser> self, Provider<ReviewDb> dbProvider, AccountCache byIdCache) {
    this.self = self;
    this.dbProvider = dbProvider;
    this.byIdCache = byIdCache;
  }

  @Override
  public Response<String> apply(AccountResource rsrc, Input input)
      throws AuthException, ResourceNotFoundException, OrmException, IOException {
    if (self.get() != rsrc.getUser() && !self.get().getCapabilities().canModifyAccount()) {
      throw new AuthException("not allowed to set status");
    }
    return apply(rsrc.getUser(), input);
  }

  public Response<String> apply(IdentifiedUser user, Input input)
      throws ResourceNotFoundException, OrmException, IOException {
    if (input == null) {
      input = new Input();
    }

    String newStatus = input.status;
    Account a =
        dbProvider
            .get()
            .accounts()
            .atomicUpdate(
                user.getAccountId(),
                new AtomicUpdate<Account>() {
                  @Override
                  public Account update(Account a) {
                    a.setStatus(Strings.nullToEmpty(newStatus));
                    return a;
                  }
                });
    if (a == null) {
      throw new ResourceNotFoundException("account not found");
    }
    byIdCache.evict(a.getId());
    return Strings.isNullOrEmpty(a.getStatus()) ? Response.none() : Response.ok(a.getStatus());
  }
}