package jxl.biff;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import jxl.Cell;
import jxl.CellType;
import jxl.LabelCell;
import jxl.Sheet;

public class CellFinder {
  private Sheet sheet;
  
  public CellFinder(Sheet s) {
    this.sheet = s;
  }
  
  public Cell findCell(String contents, int firstCol, int firstRow, int lastCol, int lastRow, boolean reverse) {
    Cell cell = null;
    boolean found = false;
    int numCols = lastCol - firstCol;
    int numRows = lastRow - firstRow;
    int row1 = reverse ? lastRow : firstRow;
    int row2 = reverse ? firstRow : lastRow;
    int col1 = reverse ? lastCol : firstCol;
    int col2 = reverse ? firstCol : lastCol;
    int inc = reverse ? -1 : 1;
    for (int i = 0; i <= numCols && !found; i++) {
      for (int j = 0; j <= numRows && !found; j++) {
        int curCol = col1 + i * inc;
        int curRow = row1 + j * inc;
        if (curCol < this.sheet.getColumns() && curRow < this.sheet.getRows()) {
          Cell c = this.sheet.getCell(curCol, curRow);
          if (c.getType() != CellType.EMPTY)
            if (c.getContents().equals(contents)) {
              cell = c;
              found = true;
            }  
        } 
      } 
    } 
    return cell;
  }
  
  public Cell findCell(String contents) {
    Cell cell = null;
    boolean found = false;
    for (int i = 0; i < this.sheet.getRows() && !found; i++) {
      Cell[] row = this.sheet.getRow(i);
      for (int j = 0; j < row.length && !found; j++) {
        if (row[j].getContents().equals(contents)) {
          cell = row[j];
          found = true;
        } 
      } 
    } 
    return cell;
  }
  
  public Cell findCell(Pattern pattern, int firstCol, int firstRow, int lastCol, int lastRow, boolean reverse) {
    Cell cell = null;
    boolean found = false;
    int numCols = lastCol - firstCol;
    int numRows = lastRow - firstRow;
    int row1 = reverse ? lastRow : firstRow;
    int row2 = reverse ? firstRow : lastRow;
    int col1 = reverse ? lastCol : firstCol;
    int col2 = reverse ? firstCol : lastCol;
    int inc = reverse ? -1 : 1;
    for (int i = 0; i <= numCols && !found; i++) {
      for (int j = 0; j <= numRows && !found; j++) {
        int curCol = col1 + i * inc;
        int curRow = row1 + j * inc;
        if (curCol < this.sheet.getColumns() && curRow < this.sheet.getRows()) {
          Cell c = this.sheet.getCell(curCol, curRow);
          if (c.getType() != CellType.EMPTY) {
            Matcher m = pattern.matcher(c.getContents());
            if (m.matches()) {
              cell = c;
              found = true;
            } 
          } 
        } 
      } 
    } 
    return cell;
  }
  
  public LabelCell findLabelCell(String contents) {
    LabelCell cell = null;
    boolean found = false;
    for (int i = 0; i < this.sheet.getRows() && !found; i++) {
      Cell[] row = this.sheet.getRow(i);
      for (int j = 0; j < row.length && !found; j++) {
        if ((row[j].getType() == CellType.LABEL || row[j].getType() == CellType.STRING_FORMULA) && row[j].getContents().equals(contents)) {
          cell = (LabelCell)row[j];
          found = true;
        } 
      } 
    } 
    return cell;
  }
}