/*
 * 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
 *
 *   https://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.accumulo.test.constraints;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.apache.accumulo.core.data.ColumnUpdate;
import org.apache.accumulo.core.data.Mutation;
import org.apache.accumulo.core.data.constraints.Constraint;

/**
 * This class is an accumulo constraint that ensures all fields of a key are alpha numeric.
 */
public class AlphaNumKeyConstraint implements Constraint {

  static final short NON_ALPHA_NUM_ROW = 1;
  static final short NON_ALPHA_NUM_COLF = 2;
  static final short NON_ALPHA_NUM_COLQ = 3;

  static final String ROW_VIOLATION_MESSAGE = "Row was not alpha numeric";
  static final String COLF_VIOLATION_MESSAGE = "Column family was not alpha numeric";
  static final String COLQ_VIOLATION_MESSAGE = "Column qualifier was not alpha numeric";

  private boolean isAlphaNum(byte[] bytes) {
    for (byte b : bytes) {
      boolean ok = ((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || (b >= '0' && b <= '9'));
      if (!ok) {
        return false;
      }
    }

    return true;
  }

  private Set<Short> addViolation(Set<Short> violations, short violation) {
    if (violations == null) {
      violations = new LinkedHashSet<>();
      violations.add(violation);
    } else if (!violations.contains(violation)) {
      violations.add(violation);
    }
    return violations;
  }

  @Override
  public List<Short> check(Environment env, Mutation mutation) {
    Set<Short> violations = null;

    if (!isAlphaNum(mutation.getRow())) {
      violations = addViolation(violations, NON_ALPHA_NUM_ROW);
    }

    Collection<ColumnUpdate> updates = mutation.getUpdates();
    for (ColumnUpdate columnUpdate : updates) {
      if (!isAlphaNum(columnUpdate.getColumnFamily())) {
        violations = addViolation(violations, NON_ALPHA_NUM_COLF);
      }

      if (!isAlphaNum(columnUpdate.getColumnQualifier())) {
        violations = addViolation(violations, NON_ALPHA_NUM_COLQ);
      }
    }

    return violations == null ? null : new ArrayList<>(violations);
  }

  @Override
  public String getViolationDescription(short violationCode) {

    return switch (violationCode) {
      case NON_ALPHA_NUM_ROW -> ROW_VIOLATION_MESSAGE;
      case NON_ALPHA_NUM_COLF -> COLF_VIOLATION_MESSAGE;
      case NON_ALPHA_NUM_COLQ -> COLQ_VIOLATION_MESSAGE;
      default -> null;
    };

  }

}
