/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.shardingsphere.encrypt.rule;
  
  import com.cedarsoftware.util.CaseInsensitiveMap;
  import lombok.Getter;
  import org.apache.shardingsphere.encrypt.api.config.rule.EncryptColumnRuleConfiguration;
  import org.apache.shardingsphere.encrypt.api.config.rule.EncryptTableRuleConfiguration;
  import org.apache.shardingsphere.encrypt.exception.metadata.EncryptColumnNotFoundException;
  import org.apache.shardingsphere.encrypt.exception.metadata.EncryptLogicColumnNotFoundException;
  import org.apache.shardingsphere.encrypt.rule.column.EncryptColumn;
  import org.apache.shardingsphere.encrypt.rule.column.item.AssistedQueryColumnItem;
  import org.apache.shardingsphere.encrypt.rule.column.item.CipherColumnItem;
  import org.apache.shardingsphere.encrypt.rule.column.item.LikeQueryColumnItem;
  import org.apache.shardingsphere.encrypt.spi.EncryptAlgorithm;
  import org.apache.shardingsphere.infra.exception.core.ShardingSpherePreconditions;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Optional;
  
  /**
   * Encrypt table.
   */
  @Getter
  public final class EncryptTable {
      
      private final String table;
      
      private final Map<String, EncryptColumn> columns;
      
      public EncryptTable(final EncryptTableRuleConfiguration config, final Map<String, EncryptAlgorithm> encryptors) {
          table = config.getName();
          columns = createEncryptColumns(config, encryptors);
      }
      
      private Map<String, EncryptColumn> createEncryptColumns(final EncryptTableRuleConfiguration config, final Map<String, EncryptAlgorithm> encryptors) {
          Map<String, EncryptColumn> result = new CaseInsensitiveMap<>();
          for (EncryptColumnRuleConfiguration each : config.getColumns()) {
              result.put(each.getName(), createEncryptColumn(each, encryptors));
          }
          return result;
      }
      
      private EncryptColumn createEncryptColumn(final EncryptColumnRuleConfiguration config, final Map<String, EncryptAlgorithm> encryptors) {
          EncryptColumn result = new EncryptColumn(config.getName(), new CipherColumnItem(config.getCipher().getName(), encryptors.get(config.getCipher().getEncryptorName())));
          if (config.getAssistedQuery().isPresent()) {
              result.setAssistedQuery(new AssistedQueryColumnItem(config.getAssistedQuery().get().getName(), encryptors.get(config.getAssistedQuery().get().getEncryptorName())));
          }
          if (config.getLikeQuery().isPresent()) {
              result.setLikeQuery(new LikeQueryColumnItem(config.getLikeQuery().get().getName(), encryptors.get(config.getLikeQuery().get().getEncryptorName())));
          }
          return result;
      }
      
      /**
       * Find encryptor.
       *
       * @param logicColumnName logic column name
       * @return found encryptor
       */
      public Optional<EncryptAlgorithm> findEncryptor(final String logicColumnName) {
          return columns.containsKey(logicColumnName) ? Optional.of(columns.get(logicColumnName).getCipher().getEncryptor()) : Optional.empty();
      }
      
      /**
       * Get logic columns.
       *
       * @return logic column names
       */
      public Collection<String> getLogicColumns() {
          return columns.keySet();
      }
      
      /**
       * Is encrypt column or not.
       *
       * @param logicColumnName logic column name
       * @return encrypt column or not
       */
      public boolean isEncryptColumn(final String logicColumnName) {
          return columns.containsKey(logicColumnName);
      }
     
     /**
      * Get encrypt column.
      *
      * @param logicColumnName logic column name
      * @return encrypt column
      */
     public EncryptColumn getEncryptColumn(final String logicColumnName) {
         ShardingSpherePreconditions.checkState(isEncryptColumn(logicColumnName), () -> new EncryptColumnNotFoundException(table, logicColumnName));
         return columns.get(logicColumnName);
     }
     
     /**
      * Is cipher column or not.
      *
      * @param columnName column name
      * @return cipher column or not
      */
     public boolean isCipherColumn(final String columnName) {
         return columns.values().stream().anyMatch(each -> each.getCipher().getName().equalsIgnoreCase(columnName));
     }
     
     /**
      * Get logic column by cipher column.
      * 
      * @param cipherColumnName cipher column name
      * @return logic column name
      * @throws EncryptLogicColumnNotFoundException encrypt logic column not found exception
      */
     public String getLogicColumnByCipherColumn(final String cipherColumnName) {
         for (Entry<String, EncryptColumn> entry : columns.entrySet()) {
             if (entry.getValue().getCipher().getName().equalsIgnoreCase(cipherColumnName)) {
                 return entry.getValue().getName();
             }
         }
         throw new EncryptLogicColumnNotFoundException(cipherColumnName);
     }
     
     /**
      * Get logic column by assisted query column.
      *
      * @param assistQueryColumnName assisted query column name
      * @return logic column name
      * @throws EncryptLogicColumnNotFoundException encrypt logic column not found exception
      */
     public String getLogicColumnByAssistedQueryColumn(final String assistQueryColumnName) {
         for (Entry<String, EncryptColumn> entry : columns.entrySet()) {
             if (entry.getValue().getAssistedQuery().isPresent() && entry.getValue().getAssistedQuery().get().getName().equalsIgnoreCase(assistQueryColumnName)) {
                 return entry.getValue().getName();
             }
         }
         throw new EncryptLogicColumnNotFoundException(assistQueryColumnName);
     }
     
     /**
      * Is assisted query column or not.
      *
      * @param columnName column name
      * @return assisted query column or not
      */
     public boolean isAssistedQueryColumn(final String columnName) {
         return columns.values().stream().anyMatch(each -> columnName.equalsIgnoreCase(each.getAssistedQuery().map(AssistedQueryColumnItem::getName).orElse(null)));
     }
     
     /**
      * Is like query column or not.
      *
      * @param columnName column name
      * @return like query column or not
      */
     public boolean isLikeQueryColumn(final String columnName) {
         return columns.values().stream().anyMatch(each -> columnName.equalsIgnoreCase(each.getLikeQuery().map(LikeQueryColumnItem::getName).orElse(null)));
     }
 }