/**

 * SQL-DK

 * Copyright © 2014 František Kučera (frantovo.cz)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

package info.globalcode.sql.dk.formatting;

import info.globalcode.sql.dk.ColorfulPrintWriter.TerminalColor;

import java.util.ArrayList;

import java.util.List;

import static info.globalcode.sql.dk.Functions.lpad;

import static info.globalcode.sql.dk.Functions.rpad;

import static info.globalcode.sql.dk.Functions.repeat;

/**

 * Longer values are line-wrapped – the cell then contains multiple lines. Marks are added to

 * signalize forced line ends (not present in original data).

 *

 * @author Ing. František Kučera (frantovo.cz)

 */

public class TabularWrappingFormatter extends TabularFormatter {

	public static final String NAME = "tabular-wrapping"; // bash-completion:formatter

	private List<String[]> currentRow;

	public TabularWrappingFormatter(FormatterContext formatterContext) {

		super(formatterContext);

	}

	@Override

	public void writeStartResultSet(ColumnsHeader header) {

		super.writeStartResultSet(header);

		currentRow = new ArrayList<>(header.getColumnCount());

	}

	@Override

	protected void writeColumnValueInternal(Object value) {

		boolean rightAlign = value instanceof Number || value instanceof Boolean;

		String valueString = String.valueOf(value);

		int columnWidth = getColumnWidth(getCurrentColumnsCount()) - 1;  // -1 = space for new line symbol

		currentRow.add(wrapLines(valueString, columnWidth, rightAlign));

	}

	@Override

	public void writeEndRow() {

		super.writeEndRow();

		int wrappedLine = 0;

		boolean hasMoreWrappedLines;

		do {

			hasMoreWrappedLines = false;

			for (int i = 0; i < currentRow.size(); i++) {

				if (i == 0) {

					printTableIndent();

					printTableBorder("│ ");

				} else {

					printTableBorder(" │ ");

				}

				String[] columnArray = currentRow.get(i);

				if (wrappedLine < columnArray.length) {

					printValueWithWhitespaceReplaced(columnArray[wrappedLine]);

					if (wrappedLine < columnArray.length - 1) {

						out.print(TerminalColor.Red, "↩");

						hasMoreWrappedLines = true;

					} else {

						out.print(" ");

					}

				} else {

					out.print(repeat(' ', getColumnWidth(i + 1)));

				}

				if (i == (currentRow.size() - 1)) {

					printTableBorder(" │");

				}

			}

			out.println();

			out.flush();

			wrappedLine++;

		} while (hasMoreWrappedLines);

		currentRow.clear();

	}

	@Override

	public void writeEndRowInternal() {

		// already done – wrapped row ends

	}

	private static String[] wrapLines(String s, int width, boolean rightAlign) {

		String[] array = new String[(s.length() - 1) / width + 1];

		for (int i = 0; i < array.length; i++) {

			if (i == array.length - 1) {

				String part = s.substring(i * width, s.length());

				array[i] = rightAlign ? lpad(part, width) : rpad(part, width);

			} else {

				array[i] = s.substring(i * width, (i + 1) * width);

			}

		}

		return array;

	}

}