/*
 * 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.texera.amber.operator.ifStatement

import org.apache.texera.amber.core.executor.OperatorExecutor
import org.apache.texera.amber.core.state.State
import org.apache.texera.amber.core.tuple.{Tuple, TupleLike}
import org.apache.texera.amber.core.workflow.PortIdentity
import org.apache.texera.amber.util.JSONUtils.objectMapper

class IfOpExec(descString: String) extends OperatorExecutor {
  private val desc: IfOpDesc = objectMapper.readValue(descString, classOf[IfOpDesc])
  private var outputPort: PortIdentity = PortIdentity(1) // by default, it should be the true port.

  //This function can handle one or more states.
  //The state can have mutiple key-value pairs. Keys are not identified by conditionName will be ignored.
  //It can accept any value that can be converted to a boolean. For example, Int 1 will be converted to true.
  override def processState(state: State, port: Int): Option[State] = {
    outputPort =
      if (state.get(desc.conditionName).asInstanceOf[Boolean]) PortIdentity(1) else PortIdentity()
    Some(state)
  }

  override def processTupleMultiPort(
      tuple: Tuple,
      port: Int
  ): Iterator[(TupleLike, Option[PortIdentity])] =
    Iterator((tuple, Some(outputPort)))

  override def processTuple(tuple: Tuple, port: Int): Iterator[TupleLike] = ???
}
