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/*
 * Copyright (C) 2015 Square, 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 keywhiz.service.daos;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import java.time.OffsetDateTime;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import javax.annotation.Nullable;
import javax.inject.Inject;
import keywhiz.api.model.SecretSeries;
import keywhiz.jooq.tables.records.SecretsRecord;
import keywhiz.service.config.Readonly;
import org.jooq.Configuration;
import org.jooq.DSLContext;
import org.jooq.impl.DSL;

import static com.google.common.base.Preconditions.checkNotNull;
import static keywhiz.jooq.tables.Accessgrants.ACCESSGRANTS;
import static keywhiz.jooq.tables.Secrets.SECRETS;
import static keywhiz.jooq.tables.SecretsContent.SECRETS_CONTENT;

/**
 * Interacts with 'secrets' table and actions on {@link SecretSeries} entities.
 */
public class SecretSeriesDAO {
  private final DSLContext dslContext;
  private final ObjectMapper mapper;
  private final SecretSeriesMapper secretSeriesMapper;

  private SecretSeriesDAO(DSLContext dslContext, ObjectMapper mapper, SecretSeriesMapper secretSeriesMapper) {
    this.dslContext = dslContext;
    this.mapper = mapper;
    this.secretSeriesMapper = secretSeriesMapper;
  }

  long createSecretSeries(String name, String creator, String description, @Nullable String type,
      @Nullable Map generationOptions) {
    SecretsRecord r =  dslContext.newRecord(SECRETS);

    long now = OffsetDateTime.now().toEpochSecond();

    r.setName(name);
    r.setDescription(description);
    r.setCreatedby(creator);
    r.setCreatedat(now);
    r.setUpdatedby(creator);
    r.setUpdatedat(now);
    r.setType(type);
    if (generationOptions != null) {
      try {
        r.setOptions(mapper.writeValueAsString(generationOptions));
      } catch (JsonProcessingException e) {
        // Serialization of a Map can never fail.
        throw Throwables.propagate(e);
      }
    } else {
      r.setOptions("{}");
    }
    r.store();

    return r.getId();
  }

  public Optional getSecretSeriesById(long id) {
    SecretsRecord r = dslContext.fetchOne(SECRETS, SECRETS.ID.eq(id));
    return Optional.ofNullable(r).map(secretSeriesMapper::map);
  }

  public Optional getSecretSeriesByName(String name) {
    SecretsRecord r = dslContext.fetchOne(SECRETS, SECRETS.NAME.eq(name));
    return Optional.ofNullable(r).map(secretSeriesMapper::map);
  }

  public ImmutableList getSecretSeries() {
    List r = dslContext
        .selectFrom(SECRETS)
        .fetch()
        .map(secretSeriesMapper);

    return ImmutableList.copyOf(r);
  }

  public void deleteSecretSeriesByName(String name) {
    dslContext.transaction(configuration -> {
      SecretsRecord r = DSL.using(configuration).fetchOne(SECRETS, SECRETS.NAME.eq(name));
      if (r != null) {
        DSL.using(configuration)
                .delete(SECRETS)
                .where(SECRETS.ID.eq(r.getId()))
                .execute();
        DSL.using(configuration)
                .delete(SECRETS_CONTENT)
                .where(SECRETS_CONTENT.SECRETID.eq(r.getId()))
                .execute();
        DSL.using(configuration)
                .delete(ACCESSGRANTS)
                .where(ACCESSGRANTS.SECRETID.eq(r.getId()))
                .execute();
      }
    });
  }

  public void deleteSecretSeriesById(long id) {
    dslContext.transaction(configuration -> {
      DSL.using(configuration)
              .delete(SECRETS)
              .where(SECRETS.ID.eq(id))
              .execute();
      DSL.using(configuration)
              .delete(SECRETS_CONTENT)
              .where(SECRETS_CONTENT.SECRETID.eq(id))
              .execute();
      DSL.using(configuration)
              .delete(ACCESSGRANTS)
              .where(ACCESSGRANTS.SECRETID.eq(id))
              .execute();
    });
  }

  public static class SecretSeriesDAOFactory implements DAOFactory {
    private final DSLContext jooq;
    private final DSLContext readonlyJooq;
    private final ObjectMapper objectMapper;
    private final SecretSeriesMapper secretSeriesMapper;

    @Inject public SecretSeriesDAOFactory(DSLContext jooq, @Readonly DSLContext readonlyJooq,
        ObjectMapper objectMapper, SecretSeriesMapper secretSeriesMapper) {
      this.jooq = jooq;
      this.readonlyJooq = readonlyJooq;
      this.objectMapper = objectMapper;
      this.secretSeriesMapper = secretSeriesMapper;
    }

    @Override public SecretSeriesDAO readwrite() {
      return new SecretSeriesDAO(jooq, objectMapper, secretSeriesMapper);
    }

    @Override public SecretSeriesDAO readonly() {
      return new SecretSeriesDAO(readonlyJooq, objectMapper, secretSeriesMapper);
    }

    @Override public SecretSeriesDAO using(Configuration configuration) {
      DSLContext dslContext = DSL.using(checkNotNull(configuration));
      return new SecretSeriesDAO(dslContext, objectMapper, secretSeriesMapper);
    }
  }
}