/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 *    if and wherever such third-party acknowledgments normally appear.
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 * <http://www.apache.org/>.
 */

package org.apache.poi.hssf.usermodel;

import junit.framework.TestCase;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.model.Sheet;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.BOFRecord;
import org.apache.poi.hssf.record.EOFRecord;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.util.List;
import java.util.Iterator;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * @author Andrew C. Oliver (acoliver at apache dot org)
 */

public class TestFormulas
extends TestCase {
    public TestFormulas(String s) {
        super(s);
    }
    
    /**
     * Add 1+1 -- WHoohoo!
     */
    
    public void testBasicAddIntegers()
    throws Exception {
        //System.out.println("Converted Text form is : "+fp.toFormulaString(fp.getRPNPtg()));
        
        short            rownum = 0;
        File file = File.createTempFile("testFormula",".xls");
        FileOutputStream out    = new FileOutputStream(file);
        HSSFWorkbook     wb     = new HSSFWorkbook();
        HSSFSheet        s      = wb.createSheet();
        HSSFRow          r      = null;
        HSSFCell         c      = null;
        
        //get our minimum values
        r = s.createRow((short)1);
        c = r.createCell((short)1);
        c.setCellFormula(1 + "+" + 1);
        
        wb.write(out);
        out.close();
        
        FileInputStream in = new FileInputStream(file);
        wb = new HSSFWorkbook(in);
        s  = wb.getSheetAt(0);
        r  = s.getRow((short)1);
        c  = r.getCell((short)1);
        
        assertTrue("Formula is as expected",("1+1".equals(c.getCellFormula())));
        in.close();
    }
    
    /**
     * Add various integers
     */
    
    public void testAddIntegers()
    throws Exception {
        binomialOperator("+");
    }
    
    /**
     * Multiply various integers
     */
    
    public void testMultplyIntegers()
    throws Exception {
        binomialOperator("*");
    }
    
    /**
     * Subtract various integers
     */
    public void testSubtractIntegers()
    throws Exception {
        binomialOperator("-");
    }
    
    /**
     * Subtract various integers
     */
    public void testDivideIntegers()
    throws Exception {
        binomialOperator("/");
    }
    
    /**
     * Exponentialize various integers;
     */
    public void testPowerIntegers()
    throws Exception {
        binomialOperator("^");
    }

    /**
     * Concatinate two numbers 1&2 = 12
     */
    public void testConcatIntegers() 
    throws Exception {
        binomialOperator("&");
    }
    
    /**
     * tests 1*2+3*4
     */
    public void testOrderOfOperationsMultiply() 
    throws Exception {
        orderTest("1*2+3*4");
    }
    
    /**
     * tests 1*2+3^4
     */
    public void testOrderOfOperationsPower() 
    throws Exception {
        orderTest("1*2+3^4");
    }
    
    /**
     * Tests that parenthesis are obeyed
     */
    public void testParenthesis() 
    throws Exception {
        orderTest("(1*3)+2+(1+2)*(3^4)^5");
    }

    /**
     * tests order wrting out == order writing in for a given formula
     */    
    private void orderTest(String formula) 
    throws Exception {
        File file = File.createTempFile("testFormula",".xls");
        FileOutputStream out    = new FileOutputStream(file);
        HSSFWorkbook     wb     = new HSSFWorkbook();
        HSSFSheet        s      = wb.createSheet();
        HSSFRow          r      = null;
        HSSFCell         c      = null;
        
        //get our minimum values
        r = s.createRow((short)0);
        c = r.createCell((short)1);
        c.setCellFormula(formula);
                       
        wb.write(out);
        out.close();
        assertTrue("file exists",file.exists());

        FileInputStream  in     = new FileInputStream(file);
        wb     = new HSSFWorkbook(in);
        s      = wb.getSheetAt(0);
        
        //get our minimum values
        r = s.getRow((short)0);
        c = r.getCell((short)1);
        assertTrue("minval Formula is as expected",
                   formula.equals(c.getCellFormula())
                  );
        
        in.close();
    }
    
    /**
     * All multi-binomial operator tests use this to create a worksheet with a
     * huge set of x operator y formulas.  Next we call binomialVerify and verify
     * that they are all how we expect.
     */
    private void binomialOperator(String operator)
    throws Exception {
        short            rownum = 0;
        File file = File.createTempFile("testFormula",".xls");
        FileOutputStream out    = new FileOutputStream(file);
        HSSFWorkbook     wb     = new HSSFWorkbook();
        HSSFSheet        s      = wb.createSheet();
        HSSFRow          r      = null;
        HSSFCell         c      = null;
        
        //get our minimum values
        r = s.createRow((short)0);
        c = r.createCell((short)1);
        c.setCellFormula(1 + operator + 1);
        
        for (short x = 1; x < Short.MAX_VALUE && x > 0; x=(short)(x*2)) {
            r = s.createRow((short) x);
            //System.out.println("x="+x);
            for (short y = 1; y < 256 && y > 0; y++) {
                //System.out.println("y="+y);
                c = r.createCell((short) y);
                c.setCellFormula("" + x + operator + y);
                
            }
        }
        
        //make sure we do the maximum value of the Int operator
        if (s.getLastRowNum() < Short.MAX_VALUE) {
            r = s.createRow((short)0);
            c = r.createCell((short)0);
            c.setCellFormula("" + Short.MAX_VALUE + operator + Short.MAX_VALUE);
        }
        
        wb.write(out);
        out.close();
        assertTrue("file exists",file.exists());
        
        binomialVerify(operator,file);
    }
    
    /**
     * Opens the sheet we wrote out by binomialOperator and makes sure the formulas
     * all match what we expect (x operator y)
     */
    private void binomialVerify(String operator, File file)
    throws Exception {
        short            rownum = 0;
        
        FileInputStream  in     = new FileInputStream(file);
        HSSFWorkbook     wb     = new HSSFWorkbook(in);
        HSSFSheet        s      = wb.getSheetAt(0);
        HSSFRow          r      = null;
        HSSFCell         c      = null;
        
        //get our minimum values
        r = s.getRow((short)0);
        c = r.getCell((short)1);
        assertTrue("minval Formula is as expected 1"+operator+"1 != "+c.getCellFormula(),
        ( ("1"+operator+"1").equals(c.getCellFormula())
        ));
        
        for (short x = 1; x < Short.MAX_VALUE && x > 0; x=(short)(x*2)) {
            r = s.getRow((short) x);
            //System.out.println("x="+x);
            for (short y = 1; y < 256 && y > 0; y++) {
                //System.out.println("y="+y);
                c = r.getCell((short) y);

                assertTrue("loop Formula is as expected "+x+operator+y+"!="+c.getCellFormula(),(
                (""+x+operator+y).equals(c.getCellFormula())
                                                         )
                );
                
                
            }
        }
        
        //test our maximum values
        r = s.getRow((short)0);
        c = r.getCell((short)0);
        
        
        assertTrue("maxval Formula is as expected",(
        (""+Short.MAX_VALUE+operator+Short.MAX_VALUE).equals(c.getCellFormula())
                                                   )
        );
        
        in.close();
        assertTrue("file exists",file.exists());
    }
    
    
    
    public static void main(String [] args) {
        System.out
        .println("Testing org.apache.poi.hssf.usermodel.TestFormulas");
        junit.textui.TestRunner.run(TestFormulas.class);
    }
    
}