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/* ====================================================================
   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.poi.ss.formula;

import org.apache.poi.ss.formula.eval.AreaEval;
import org.apache.poi.ss.formula.eval.AreaEvalBase;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.ptg.AreaI;
import org.apache.poi.ss.formula.ptg.AreaI.OffsetArea;
import org.apache.poi.ss.util.CellReference;

/**
 * Provides Lazy Evaluation to 3D Ranges
 */
final class LazyAreaEval extends AreaEvalBase {
	private final SheetRangeEvaluator _evaluator;

	LazyAreaEval(AreaI ptg, SheetRangeEvaluator evaluator) {
		super(ptg, evaluator);
		_evaluator = evaluator;
	}

	public LazyAreaEval(int firstRowIndex, int firstColumnIndex, int lastRowIndex,
			int lastColumnIndex, SheetRangeEvaluator evaluator) {
		super(evaluator, firstRowIndex, firstColumnIndex, lastRowIndex, lastColumnIndex);
		_evaluator = evaluator;
	}

    public ValueEval getRelativeValue(int relativeRowIndex, int relativeColumnIndex) {
        return getRelativeValue(getFirstSheetIndex(), relativeRowIndex, relativeColumnIndex);
    }
    public ValueEval getRelativeValue(int sheetIndex, int relativeRowIndex, int relativeColumnIndex) {
		int rowIx = (relativeRowIndex + getFirstRow() ) ;
		int colIx = (relativeColumnIndex + getFirstColumn() ) ;

		return _evaluator.getEvalForCell(sheetIndex, rowIx, colIx);
	}

	public AreaEval offset(int relFirstRowIx, int relLastRowIx, int relFirstColIx, int relLastColIx) {
		AreaI area = new OffsetArea(getFirstRow(), getFirstColumn(),
				relFirstRowIx, relLastRowIx, relFirstColIx, relLastColIx);

		return new LazyAreaEval(area, _evaluator);
	}
	public LazyAreaEval getRow(int rowIndex) {
		if (rowIndex >= getHeight()) {
			throw new IllegalArgumentException("Invalid rowIndex " + rowIndex
					+ ".  Allowable range is (0.." + getHeight() + ").");
		}
		int absRowIx = getFirstRow() + rowIndex;
		return new LazyAreaEval(absRowIx, getFirstColumn(), absRowIx, getLastColumn(), _evaluator);
	}
	public LazyAreaEval getColumn(int columnIndex) {
		if (columnIndex >= getWidth()) {
			throw new IllegalArgumentException("Invalid columnIndex " + columnIndex
					+ ".  Allowable range is (0.." + getWidth() + ").");
		}
		int absColIx = getFirstColumn() + columnIndex;
		return new LazyAreaEval(getFirstRow(), absColIx, getLastRow(), absColIx, _evaluator);
	}

	public String toString() {
		CellReference crA = new CellReference(getFirstRow(), getFirstColumn());
		CellReference crB = new CellReference(getLastRow(), getLastColumn());
		StringBuffer sb = new StringBuffer();
		sb.append(getClass().getName()).append("[");
		sb.append(_evaluator.getSheetNameRange());
		sb.append('!');
		sb.append(crA.formatAsString());
		sb.append(':');
		sb.append(crB.formatAsString());
		sb.append("]");
		return sb.toString();
	}

    /**
     * @return  whether cell at rowIndex and columnIndex is a subtotal
    */
    public boolean isSubTotal(int rowIndex, int columnIndex){
        // delegate the query to the sheet evaluator which has access to internal ptgs
        SheetRefEvaluator _sre = _evaluator.getSheetEvaluator(_evaluator.getFirstSheetIndex());
        return _sre.isSubTotal(getFirstRow() + rowIndex, getFirstColumn() + columnIndex);
    }
}