/**
 * 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.tajo.plan.logical;

import com.google.common.base.Objects;
import com.google.gson.annotations.Expose;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.fs.Path;
import org.apache.tajo.catalog.TableDesc;
import org.apache.tajo.plan.PlanString;
import org.apache.tajo.plan.Target;
import org.apache.tajo.plan.expr.EvalNode;
import org.apache.tajo.util.TUtil;

import java.util.ArrayList;
import java.util.Arrays;

public class PartitionedTableScanNode extends ScanNode {
  @Expose private Path [] inputPaths;

  public PartitionedTableScanNode(int pid) {
    super(pid, NodeType.PARTITIONS_SCAN);
  }

  public void init(ScanNode scanNode, Path[] inputPaths) {
    tableDesc = scanNode.tableDesc;
    setInSchema(scanNode.getInSchema());
    setOutSchema(scanNode.getOutSchema());
    this.qual = scanNode.qual;
    this.targets = scanNode.targets;
    setInputPaths(inputPaths);

    if (scanNode.hasAlias()) {
      alias = scanNode.alias;
    }
  }

  public void clearInputPaths() {
    this.inputPaths = null;
  }

  public void setInputPaths(Path [] paths) {
    this.inputPaths = paths;
    if (this.inputPaths != null) {
      Arrays.sort(inputPaths);
    }
  }

  public Path [] getInputPaths() {
    return inputPaths;
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(this.tableDesc, this.qual, this.targets);
  }
	
  @Override
  public boolean equals(Object obj) {
    if (obj instanceof PartitionedTableScanNode) {
      PartitionedTableScanNode other = (PartitionedTableScanNode) obj;

      boolean eq = super.equals(other);
      eq = eq && TUtil.checkEquals(this.tableDesc, other.tableDesc);
      eq = eq && TUtil.checkEquals(this.qual, other.qual);
      eq = eq && TUtil.checkEquals(this.targets, other.targets);
    eq = eq && TUtil.checkEquals(this.inputPaths, other.inputPaths);

      return eq;
    }

    return false;
  }

  @Override
  public Object clone() throws CloneNotSupportedException {
    PartitionedTableScanNode unionScan = (PartitionedTableScanNode) super.clone();

    unionScan.tableDesc = (TableDesc) this.tableDesc.clone();

    if (hasQual()) {
      unionScan.qual = (EvalNode) this.qual.clone();
    }

    if (hasTargets()) {
      unionScan.targets = new ArrayList<>();
      for (Target t : targets) {
        unionScan.targets.add((Target) t.clone());
      }
    }

    unionScan.inputPaths = inputPaths;

    return unionScan;
  }
	
  @Override
  public void preOrder(LogicalNodeVisitor visitor) {
    visitor.visit(this);
  }
	
	public void postOrder(LogicalNodeVisitor visitor) {        
    visitor.visit(this);
  }

  @Override
  public PlanString getPlanString() {
    PlanString planStr = new PlanString(this).appendTitle(" on " + getTableName());
    if (hasAlias()) {
      planStr.appendTitle(" as ").appendTitle(alias);
    }

    if (hasQual()) {
      planStr.addExplan("filter: ").appendExplain(this.qual.toString());
    }

    if (hasTargets()) {
      planStr.addExplan("target list: ").appendExplain(StringUtils.join(targets, ", "));
    }

    planStr.addDetail("out schema: ").appendDetail(getOutSchema().toString());
    planStr.addDetail("in schema: ").appendDetail(getInSchema().toString());

    if (inputPaths != null) {
      planStr.addExplan("num of filtered paths: ").appendExplain(""+ inputPaths.length);
      int i = 0;
      for (Path path : inputPaths) {
        planStr.addDetail((i++) + ": ").appendDetail(path.toString());
      }
    }

    return planStr;
  }
}