package net.sourceforge.phpdt.sql.view;

import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Vector;

import org.eclipse.jface.action.Action;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ExtendedModifyEvent;
import org.eclipse.swt.custom.ExtendedModifyListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.part.ViewPart;

import net.sourceforge.phpdt.sql.IConstants;
import net.sourceforge.phpdt.sql.Messages;
import net.sourceforge.phpdt.sql.PHPEclipseSQLPlugin;
import net.sourceforge.phpdt.sql.actions.ExecuteAction;
import net.sourceforge.phpdt.sql.actions.ExportQueryAction;
import net.sourceforge.phpdt.sql.actions.GeneratePHPAction;
import net.sourceforge.phpdt.sql.actions.ImportQueryAction;
import net.sourceforge.phpdt.sql.sql.MultiSQLServer;
import net.sourceforge.phpdt.sql.sql.parser.SQLLexx;
import net.sourceforge.phpdt.sql.sql.parser.Token;
import net.sourceforge.phpdt.sql.view.bookmark.BookmarkNode;

public class SQLQueryView extends ViewPart implements IConstants {
	ExecuteAction executeAction;
	ImportQueryAction importQueryAction;
	ExportQueryAction exportQueryAction;
	GeneratePHPAction generatePHPAction;
	private Clipboard clip;
	private Label statusImage;
	private Label status;
	private ProgressBar progress;
	private static SQLQueryView instance = null;
	private StyledText widget;
	private Color STRING_LITERAL;
	private Color KEYWORD;
	private Color COMMENT;
	private Color NUMERIC;
	private Color DEFAULT;
	private long parseTime = 0;
	private long fullTime = 0;
	public SQLQueryView() {
		super();
	}
	public void setFocus() {
		widget.setFocus();
	}
	public static SQLQueryView getInstance() {
		return instance;
	}

	public void createPartControl(org.eclipse.swt.widgets.Composite parent) {
		instance = this;
		initActions();
	   	KEYWORD = new Color(parent.getShell().getDisplay(), 126, 0, 75);
	   	STRING_LITERAL = new Color(parent.getShell().getDisplay(), 0, 0, 255);
	   	COMMENT = new Color(parent.getShell().getDisplay(), 88, 148, 64);
	   	NUMERIC = new Color(parent.getShell().getDisplay(), 255, 0, 0);
	    DEFAULT = new Color(parent.getShell().getDisplay(), 0, 0, 0);
		clip = new Clipboard(getSite().getShell().getDisplay());
		Composite main = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout(1, false);
		layout.horizontalSpacing = 0;
		layout.verticalSpacing = 0;
		main.setLayout(layout);
		ToolBar toolbar = new ToolBar(main, SWT.HORIZONTAL);
		ToolItem item = new ToolItem(toolbar, SWT.PUSH);
		item.setImage(PHPEclipseSQLPlugin.getImage("play.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("sqlqueryview.executeQuery")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				executeAction.run();
			}
		});
		item = new ToolItem(toolbar, SWT.SEPARATOR);
		item = new ToolItem(toolbar, SWT.PUSH);
		item.setImage(PHPEclipseSQLPlugin.getImage("import.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("sqlqueryview.importQuery")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				importQueryAction.run();
			}
		});
		item = new ToolItem(toolbar, SWT.PUSH);
		item.setImage(PHPEclipseSQLPlugin.getImage("export.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("sqlqueryview.exportQuery")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				exportQueryAction.run();
			}
		});
		item = new ToolItem(toolbar, SWT.PUSH);
		item.setImage(PHPEclipseSQLPlugin.getImage("php.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("sqlqueryview.generatePHP")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				generatePHPAction.run();
			}
		});		
		item = new ToolItem(toolbar, SWT.PUSH);
		item.setImage(PHPEclipseSQLPlugin.getImage("clear.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("sqlqueryview.clear")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				setQuery(""); //$NON-NLS-1$
			}
		});

		item = new ToolItem(toolbar, SWT.SEPARATOR);

		item = new ToolItem(toolbar, SWT.PUSH);
		final ToolItem commit = item;
		item.setImage(PHPEclipseSQLPlugin.getImage("commit.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("SQLQueryView.Commit")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				BookmarkNode node = BookmarkView.getInstance().getCurrentBookmark();
				MultiSQLServer.getInstance().commit(node.getConnection());
			}
		});
		item.setEnabled(false);
		
		item = new ToolItem(toolbar, SWT.PUSH);
		final ToolItem rollback = item;
		item.setImage(PHPEclipseSQLPlugin.getImage("rollback.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("SQLQueryView.RollBack")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				BookmarkNode node = BookmarkView.getInstance().getCurrentBookmark();
				MultiSQLServer.getInstance().rollback(node.getConnection());
			}
		});
		item.setEnabled(false);
		
		item = new ToolItem(toolbar, SWT.CHECK);
		final ToolItem autocommit = item;
		item.setImage(PHPEclipseSQLPlugin.getImage("autocommit.gif")); //$NON-NLS-1$
		item.setToolTipText(Messages.getString("SQLQueryView.AutoCommit")); //$NON-NLS-1$
		item.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				BookmarkNode node = BookmarkView.getInstance().getCurrentBookmark();
				
				MultiSQLServer.getInstance().setAutoCommit(node.getConnection(), autocommit.getSelection());
				if (autocommit.getSelection()) {
					commit.setEnabled(false);
					rollback.setEnabled(false);
				} else {
					commit.setEnabled(true);
					rollback.setEnabled(true);
				}
			}
		});
		item.setSelection(true);
		
		widget = new StyledText(main, SWT.H_SCROLL | SWT.V_SCROLL);

		IActionBars bars = this.getViewSite().getActionBars();
		bars.setGlobalActionHandler(IWorkbenchActionConstants.CUT, cutAction);
		bars.setGlobalActionHandler(IWorkbenchActionConstants.COPY, copyAction);
		bars.setGlobalActionHandler(IWorkbenchActionConstants.PASTE, pasteAction);
		bars.setGlobalActionHandler(IWorkbenchActionConstants.SELECT_ALL, selectAllAction);

		widget.setEditable(true);
		widget.addExtendedModifyListener(modifyListener);

		GridData gridData = new GridData();
		gridData.horizontalAlignment = GridData.FILL;
		gridData.verticalAlignment = GridData.FILL;
		gridData.grabExcessHorizontalSpace = true;
		gridData.grabExcessVerticalSpace = true;
		widget.setLayoutData(gridData);

		Composite bottomStatus = new Composite(main, SWT.NONE);
		gridData = new GridData();
		gridData.horizontalAlignment = GridData.FILL;
		gridData.grabExcessHorizontalSpace = true;
		bottomStatus.setLayoutData(gridData);
		
		GridLayout horizontal = new GridLayout(3, false);
		layout.horizontalSpacing = 0;
		layout.verticalSpacing = 0;
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		bottomStatus.setLayout(horizontal);

		statusImage = new Label(bottomStatus, SWT.NONE);
		status = new Label(bottomStatus, SWT.NONE);
		gridData = new GridData();
		gridData.horizontalAlignment = GridData.FILL;
		gridData.grabExcessHorizontalSpace = true;
		status.setLayoutData(gridData);

		progress = new ProgressBar(bottomStatus, SWT.HORIZONTAL);

		status.setText(Messages.getString("sqlqueryview.done")); //$NON-NLS-1$
		statusImage.setImage(PHPEclipseSQLPlugin.getImage("success.gif")); //$NON-NLS-1$
		progress.setMinimum(0);
	}

	public void setProgress(int increment, int max) {
		progress.setMaximum(max);
		progress.setSelection(increment);
	}
	
	private void initActions() {
		executeAction = new ExecuteAction();
		executeAction.init(this);
		importQueryAction = new ImportQueryAction();
		importQueryAction.init(this);
		exportQueryAction = new ExportQueryAction();
		exportQueryAction.init(this);
		generatePHPAction = new GeneratePHPAction();
		generatePHPAction.init(this);
	}

	public void setStatus(String text) {
		statusImage.setImage(null);
		status.setText(text);
	}

	public void setStatus(Image img, String text) {
		statusImage.setImage(img);
		status.setText(text);
	}
	
	public String getQuery() {
		return widget.getText();
	}
	
	public void setQuery(String text) {
		widget.setText(text);
	}
	
	private String[] keywords = {"SELECT", "DROP", "FROM",  //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
		"INSERT", "INTO", "VALUES", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
		"CREATE", "TABLE", "VIEW", "SEQUENCE", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
		"UPDATE", "SET", "WHERE"}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

	SyntaxHighlighter textUpdater = new SyntaxHighlighter();
	
	private class UpdateRequest {
		public UpdateRequest(String text, int start, int length) {
			this.text = text;
			this.start = start;
			this.length = length;
		}
		public String text;
		public int start;
		public int length;
	}
	
	private class SyntaxHighlighter extends Thread {
		private boolean running = true;
		private LinkedList requests = new LinkedList();
		public SyntaxHighlighter() {
			super();
			setPriority(Thread.MIN_PRIORITY);
			start();
		}
		public synchronized void updateText(String text, int start, int length) {
			requests.add(new UpdateRequest(text, start, length));
			notify();
		}
		public synchronized void shutdown() {
			running = false;
			interrupt();
		}
		public void run() {
			while (running) {
				try {
					synchronized (this) {
						if (requests.size() <= 0) {
							wait();
						} else {
							Thread.sleep(10);
						}
					}
					UpdateRequest request = (UpdateRequest) requests.removeFirst();
					String text = request.text.toUpperCase();
					int dirtyStart = request.start;
					int dirtyEnd = request.start + request.length;
					StyleRange styleRange;
					long startTime = System.currentTimeMillis();
					Vector tokens = SQLLexx.parse(text);
					long subTime = System.currentTimeMillis();
					Vector styles = new Vector();
					int min = Integer.MAX_VALUE;
					int max = 0;
					for (int i = 0; i < tokens.size(); i++) {
						Token t = (Token) tokens.elementAt(i);
						String value = t.getValue();
						int start = t.getStart();
						int length = t.getEnd() - t.getStart();
						styleRange = new StyleRange();
						styleRange.start = start;
						styleRange.length = value.length();
						styleRange.fontStyle = SWT.NULL;
						styleRange.foreground = DEFAULT;
						boolean upper = start <= dirtyEnd && start >= dirtyStart;
						boolean lower = ((start + length) >= dirtyStart && (start + length) <= dirtyEnd);
						boolean both = (start <= dirtyStart && (start + length) >= dirtyEnd);
						if (upper || lower || both) {
							min = Math.min(start, min);
							max = Math.max(max, start + length);
							if (t.getType() == Token.IDENTIFIER) {
								boolean keyword = false;
								for (int index = 0; index < keywords.length; index++) {
									if (value.equals(keywords[index])) {
										keyword = true;
									}
								}
								if (keyword) {
									styleRange.fontStyle = SWT.BOLD;
									styleRange.foreground = KEYWORD;
								} else {
									styleRange.foreground = DEFAULT;
								}
								styles.addElement(styleRange);
							} else if (t.getType() == Token.COMMENT) {
								styleRange.foreground = COMMENT;
								styles.addElement(styleRange);
							} else if (t.getType() == Token.LITERAL) {
								styleRange.foreground = STRING_LITERAL;
								styles.addElement(styleRange);
							} else if (t.getType() == Token.NUMERIC) {
								styleRange.foreground = NUMERIC;
								styles.addElement(styleRange);
							} else {
								styles.addElement(styleRange);
							}
						}
					}
					StyleRange[] ranges = new StyleRange[styles.size()];
					for (int k = 0; k < ranges.length; k++) {
						ranges[k] = (StyleRange) styles.elementAt(k);
					}
					if (max >= 0 && ranges.length > 0) {
						setStyles(ranges, min, max - min);
					}
					long endTime = System.currentTimeMillis();
					parseTime = subTime - startTime;
					fullTime = endTime - startTime;
				} catch (NoSuchElementException e) {
					// ignore a missing request
				} catch (InterruptedException e) {
					// ignore any interruptions
				}
			}
		}
	}
	public void setStyles(final StyleRange[] styles, final int start, final int length) {
		getViewSite().getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				try {
					for (int i = 0; i < styles.length; i++) {
						widget.setStyleRange(styles[i]);
					}
				} catch (Throwable t) {
					System.out.println("Error with styles: " + t.getClass().toString()); //$NON-NLS-1$
					// ignore any errors
				}
			}
		});
	}
	
	ExtendedModifyListener modifyListener = new ExtendedModifyListener() {
		public void modifyText(ExtendedModifyEvent event) {
			textUpdater.updateText(getQuery(), event.start, event.length);
		}
	};
		
	private Action cutAction = new Action() {
		public void run() {
			widget.cut();
		}
	};
	private Action copyAction = new Action() {
		public void run() {
			widget.copy();
		}
	};
	private Action pasteAction = new Action() {
		public void run() {
			widget.paste();
		}
	};
	private Action selectAllAction = new Action() {
		public void run() {
			widget.selectAll();
		}
	};
}