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/*
 The MIT License

 Copyright (c) 2004-2011 Paul R. Holser, Jr.

 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:

 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

package joptsimple.internal;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import static java.lang.Integer.*;
import static java.lang.System.*;
import static java.util.Collections.*;

import static joptsimple.internal.Column.*;
import static joptsimple.internal.Strings.*;


/**
 * A means to display data in a text grid.
 *
 * @author Paul Holser
 */
public class ColumnarData {
    private static final String LINE_SEPARATOR = getProperty( "line.separator" );
    private static final int TOTAL_WIDTH = 80;

    private final ColumnWidthCalculator widthCalculator;
    private final List columns;
    private final String[] headers;

    /**
     * Creates a new grid with the given column headers.
     *
     * @param headers column headers
     */
    public ColumnarData( String... headers ) {
        this.headers = headers.clone();
        widthCalculator = new ColumnWidthCalculator();
        columns = new LinkedList();

        clear();
    }

    /**
     * Adds a row to the grid.  The data will fall under the corresponding headers.
     * There can be fewer elements in the row than headers.  Any data in columns outside
     * of the number of headers will not be added to the grid.
     *
     * @param rowData row data to add
     */
    public void addRow( Object... rowData ) {
        int[] numberOfCellsAddedAt = addRowCells( rowData );
        addPaddingCells( numberOfCellsAddedAt );
    }

    /**
     * Gives a string that represents the data formatted in columns.
     *
     * @return the formatted grid
     */
    public String format() {
        StringBuilder buffer = new StringBuilder();

        writeHeadersOn( buffer );
        writeSeparatorsOn( buffer );
        writeRowsOn( buffer );

        return buffer.toString();
    }

    /**
     * Removes all data from the grid, but preserves the headers.
     */
    public final void clear() {
        columns.clear();

        int desiredColumnWidth = widthCalculator.calculate( TOTAL_WIDTH, headers.length );
        for ( String each : headers )
            columns.add( new Column( each, desiredColumnWidth ) );
    }

    private void writeHeadersOn( StringBuilder buffer ) {
        for ( Iterator iter = columns.iterator(); iter.hasNext(); )
            iter.next().writeHeaderOn( buffer, iter.hasNext() );

        buffer.append( LINE_SEPARATOR );
    }

    private void writeSeparatorsOn( StringBuilder buffer ) {
        for ( Iterator iter = columns.iterator(); iter.hasNext(); )
            iter.next().writeSeparatorOn( buffer, iter.hasNext() );

        buffer.append( LINE_SEPARATOR );
    }

    private void writeRowsOn( StringBuilder buffer ) {
        int maxHeight = max( columns, BY_HEIGHT ).height();

        for ( int i = 0; i < maxHeight; ++i )
            writeRowOn( buffer, i );
    }

    private void writeRowOn( StringBuilder buffer, int rowIndex ) {
        for ( Iterator iter = columns.iterator(); iter.hasNext(); )
            iter.next().writeCellOn( rowIndex, buffer, iter.hasNext() );

        buffer.append( LINE_SEPARATOR );
    }

    private int arrayMax( int[] numbers ) {
        int maximum = MIN_VALUE;

        for ( int each : numbers )
            maximum = Math.max( maximum, each );

        return maximum;
    }

    private int[] addRowCells( Object... rowData ) {
        int[] cellsAddedAt = new int[ rowData.length ];

        Iterator iter = columns.iterator();
        for ( int i = 0; iter.hasNext() && i < rowData.length; ++i )
            cellsAddedAt[ i ] = iter.next().addCells( rowData[ i ] );

        return cellsAddedAt;
    }

    private void addPaddingCells( int... numberOfCellsAddedAt ) {
        int maxHeight = arrayMax( numberOfCellsAddedAt );

        Iterator iter = columns.iterator();
        for ( int i = 0; iter.hasNext() && i < numberOfCellsAddedAt.length; ++i )
            addPaddingCellsForColumn( iter.next(), maxHeight, numberOfCellsAddedAt[ i ] );
    }

    private void addPaddingCellsForColumn( Column column, int maxHeight, int numberOfCellsAdded ) {
        for ( int i = 0; i < maxHeight - numberOfCellsAdded; ++i )
            column.addCell( EMPTY );
    }
}