package com.quantum.wizards;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

import com.quantum.Messages;
import com.quantum.adapters.DatabaseAdapter;
import com.quantum.model.Bookmark;
import com.quantum.model.Column;
import com.quantum.model.Entity;

public class DeleteRowPage extends BaseSQLPage implements SQLPage {
	String[] columnNames;
	Text[] values;
	Button[] whereValues;
	Text query;

	public DeleteRowPage(String pageName) {
		super(pageName);
	}
	
	public void createControl(Composite parent) {
		System.out.println("page create control"); //$NON-NLS-1$
		Composite container = new Composite(parent, SWT.V_SCROLL);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		layout.numColumns = 3;

		Entity entity = this.results.getEntity();
		columnNames = this.results.getColumnNames();

		values = new Text[columnNames.length];
		whereValues = new Button[columnNames.length];
		new Label(container, SWT.NULL).setText(Messages.getString("DeleteRowPage.ColumnName")); //$NON-NLS-1$
		new Label(container, SWT.NULL).setText(Messages.getString("DeleteRowPage.Value")); //$NON-NLS-1$
		new Label(container, SWT.NULL).setText(Messages.getString("DeleteRowPage.IncludeIn")); //$NON-NLS-1$
		for (int i = 0; i < columnNames.length; i++) {
			Label label = new Label(container, SWT.NULL);
			label.setText(columnNames[i]);
			values[i] = new Text(container, SWT.BORDER | SWT.SINGLE);
			Object object = this.row == null ? null : this.row.get(i+1);
			values[i].setText(object == null ? "" : object.toString());
			GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
			gridData.widthHint = 150;
			values[i].setLayoutData(gridData);
			values[i].addModifyListener(new ModifyListener() {
				public void modifyText(ModifyEvent event) {
					updateQuery();
				}
			});
			
			whereValues[i] = new Button(container, SWT.CHECK);
			whereValues[i].setText(Messages.getString("DeleteRowPage.WhereClause")); //$NON-NLS-1$
			// we check if it's a primary key to select it in the WHERE clause
			Column column = getColumn(entity, columnNames[i]);
            whereValues[i].setSelection(column == null ? false : column.isPrimaryKey());
			whereValues[i].addSelectionListener(new SelectionListener() {
				public void widgetDefaultSelected(SelectionEvent e) {
				}
				public void widgetSelected(SelectionEvent e) {
					updateQuery();
				}
			});
		}
		query = new Text(container, SWT.MULTI | SWT.READ_ONLY | SWT.WRAP);
 		GridData gridData = new GridData();
		gridData.horizontalSpan = layout.numColumns;
		gridData.verticalSpan = 3;
		gridData.horizontalAlignment = GridData.FILL;
		gridData.verticalAlignment = GridData.FILL;
		gridData.grabExcessHorizontalSpace = true;
		gridData.grabExcessVerticalSpace = true;
		query.setLayoutData(gridData);

 		setControl(container);
        updateQuery();
       
		setPageComplete(true);
	}
	public void updateQuery() {
		System.out.println(Messages.getString("DeleteRowPage.UpdatingQuery")); //$NON-NLS-1$
		StringBuffer whereClause = new StringBuffer();
		Bookmark bookmark = this.results.getBookmark();
		Entity entity = this.results.getEntity();
		DatabaseAdapter adapter = bookmark.getAdapter();
		
		int numSelected = 0;
		for (int i = 0; i < columnNames.length; i++) {
			if (whereValues[i].getSelection()) {
				if (numSelected > 0) whereClause.append(" AND "); //$NON-NLS-1$
				numSelected++;
				whereClause.append("("); //$NON-NLS-1$
				whereClause.append(columnNames[i]);
				whereClause.append(" = "); //$NON-NLS-1$
                appendColumn(whereClause, entity, columnNames[i], adapter, values[i].getText());
				whereClause.append(")"); //$NON-NLS-1$
			}
		}
		String query = "DELETE FROM " + this.results.getEntity().getQuotedTableName(); //$NON-NLS-1$
		if (numSelected > 0) {
			query += " WHERE " + whereClause.toString(); //$NON-NLS-1$
		}
		if (numSelected > 0) {
			setMessage(""); //$NON-NLS-1$
		} else {
			setMessage(Messages.getString("DeleteRowPage.WarningNoWhere")); //$NON-NLS-1$
		}
		this.query.setText(query);
	}
	
    protected String getQueryText() {
        return query.getText();
    }
}