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package com.jamonapi.utils;

/** This class builds the returned array data based on info from header and first row.
 * 
 *  If header has more columns than data then each data is padded with nulls.
 *  
If first rows data has more columns than header then the header is padded with headers named 'colN' where N is the column number.
 *  
If any rows of data have fewer columns than either the data in the first row or the header
 * they are shrunken or grown as neccesary filling any excess columns with nulls, and truncating any excess columns.
 * 
 */
public class BufferListDetailData implements DetailData {

    private String[] header;
    private Object[][] data;
    private Object[] firstRow;
    private int colsInHeader;
    private int colsInFirstRow;


    public BufferListDetailData(BufferList bufferList) {
        initalize(bufferList);
    }

    public String[] getHeader() {
        return header;
    }

    public Object[][] getData() {
        return data;
    }

    public int getRowCount() {
        if (isEmpty())
            return 0;
        else
            return data.length;
    }

    public boolean hasData() {
        return !isEmpty();
    }

    public boolean isEmpty() {
        return (data==null || data.length==0);
    }

    private void initalize(BufferList bufferList) {
        /* object is value object.
         * if header is bigger than data of first row then return header up to column width
         * if header is smaller than data then PAD HEADER with colN
         * if first row is smaller than subsequent rows then use colsize of first row and exclude other cols
         * if first row is bigger than subsequent rows then pad row with nulls
         */

        Object[] rows=getAllRows(bufferList);
        if (rows!=null) {
            firstRow=getRow(rows[0]);
            colsInFirstRow=firstRow.length;
        }

        colsInHeader=(bufferList.getHeader()==null) ? 0 : bufferList.getHeader().length;
        header=buildHeader(bufferList.getHeader());
        data=buildData(rows);
    }

    private Object[] getAllRows(BufferList bufferList) {
        Object[] bufferListArray=null;
        synchronized(bufferList) {
            if (bufferList.getRowCount()>0) {
                bufferListArray=bufferList.getCollection().toArray();
            }
        }

        return bufferListArray;
    }


    private String[] buildHeader(String[] h) {
        // if header is bigger than data of first row then return header up to column width
        // if header is smaller than data then PAD HEADER with colN

        Object[] head=resize(h, getColCount());
        if (head==null)
            return null;

        String[] headerStr=new String[head.length];
        for (int i=0;isize) ? size : originalData.length;

        for (int i=0;icolsInFirstRow) ? colsInHeader : colsInFirstRow;
    }


}