package net.sourceforge.phpdt.internal.debug.ui.preferences;

import java.io.File;

import net.sourceforge.phpdt.internal.debug.ui.PHPDebugUiMessages;
import net.sourceforge.phpdt.internal.debug.ui.PHPDebugUiPlugin;
import net.sourceforge.phpdt.internal.launching.PHPInterpreter;
import net.sourceforge.phpdt.internal.ui.dialogs.StatusDialog;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class EditInterpreterDialog extends StatusDialog {
	protected PHPInterpreter interpreterToEdit;
	protected Text interpreterNameText, interpreterLocationText;
	protected IStatus[] allStatus = new IStatus[2];

	public EditInterpreterDialog(Shell parentShell, String aDialogTitle) {
		super(parentShell);
		setTitle(aDialogTitle);
	}
	
	public void setInterpreterToEdit(PHPInterpreter anInterpreter) {
		interpreterToEdit = anInterpreter;
		
		String interpreterName = interpreterToEdit.getName();
		interpreterNameText.setText(interpreterName != null ? interpreterName : ""); //$NON-NLS-1$

		IPath installLocation = interpreterToEdit.getInstallLocation();
		interpreterLocationText.setText(installLocation != null ? installLocation.toOSString() : ""); //$NON-NLS-1$
	}

	protected void createLocationEntryField(Composite composite) {
		new Label(composite, SWT.NONE).setText(PHPDebugUiMessages.getString("EditInterpreterDialog.PHPInterpreter.path.label")); //$NON-NLS-1$

		Composite locationComposite = new Composite(composite, SWT.NONE);
		RowLayout locationLayout = new RowLayout();
		locationLayout.marginLeft = 0;
		locationComposite.setLayout(locationLayout);

		interpreterLocationText = new Text(locationComposite, SWT.SINGLE | SWT.BORDER);
		interpreterLocationText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				allStatus[1] = validateInterpreterLocationText();
				updateStatusLine();
			}
		});
		interpreterLocationText.setLayoutData(new RowData(120, SWT.DEFAULT));

		Button browseButton = new Button(composite, SWT.PUSH);
		browseButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
		browseButton.setText(PHPDebugUiMessages.getString("EditInterpreterDialog.PHPInterpreter.path.browse.button.label")); //$NON-NLS-1$
		browseButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				browseForInstallDir();
			}
		});
	}

	protected void updateStatusLine() {
		updateStatus(getMostSevereStatus());
	}

	protected IStatus getMostSevereStatus() {
		IStatus max = new Status(0, PHPDebugUiPlugin.PLUGIN_ID, IStatus.OK, "", null); //$NON-NLS-1$
		for (int i = 0; i < allStatus.length; i++) {
			IStatus curr = allStatus[i];
			if (curr != null) {
				if (curr.matches(IStatus.ERROR)) {
					return curr;
				}
				if (max == null || curr.getSeverity() > max.getSeverity()) {
					max = curr;
				}
			}
		}
		return max;
	}

	protected IStatus validateInterpreterLocationText() {
		File path = new File(interpreterLocationText.getText());
		if (path.exists()) {
			File unix_php = new File(path, "php"); //$NON-NLS-1$ //$NON-NLS-2$
			File windows_php_exe = new File(path, "php.exe"); //$NON-NLS-1$ //$NON-NLS-2$
			if (unix_php.isFile() || windows_php_exe.isFile())
				return new Status(IStatus.OK, PHPDebugUiPlugin.PLUGIN_ID, 0, "", null); //$NON-NLS-1$
		}

		return new Status(IStatus.ERROR, PHPDebugUiPlugin.PLUGIN_ID, 1, PHPDebugUiMessages.getString("EditInterpreterDialog.PHPInterpreter.path.error"), null); //$NON-NLS-1$
	}

	protected void createNameEntryField(Composite composite) {
		new Label(composite, SWT.NONE).setText(PHPDebugUiMessages.getString("EditInterpreterDialog.PHPInterpreter.name")); //$NON-NLS-1$

		GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gridData.horizontalSpan = 2;

		interpreterNameText = new Text(composite, SWT.SINGLE | SWT.BORDER);
		interpreterNameText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				allStatus[0] = validateInterpreterNameText();
				updateStatusLine();
			}
		});
		interpreterNameText.setLayoutData(gridData);
	}

	protected IStatus validateInterpreterNameText() {
		int status = IStatus.OK;
		String message = ""; //$NON-NLS-1$

		if (interpreterNameText.getText() == null || interpreterNameText.getText().length() <= 0) {
			status = IStatus.ERROR;
			message = PHPDebugUiMessages.getString("EditInterpreterDialog.PHPInterpreter.name.error"); //$NON-NLS-1$
		}

		return new Status(status, PHPDebugUiPlugin.PLUGIN_ID, 0, message, null);
	}

	protected void browseForInstallDir() {
		DirectoryDialog dialog = new DirectoryDialog(getShell());
		dialog.setFilterPath(interpreterLocationText.getText());
		dialog.setMessage(PHPDebugUiMessages.getString("EditInterpreterDialog.PHPInterpreter.path.browse.message")); //$NON-NLS-1$
		String newPath = dialog.open();
		if (newPath != null)
			interpreterLocationText.setText(newPath);
	}

	protected void okPressed() {
		if (interpreterToEdit == null)
			interpreterToEdit = new PHPInterpreter(null, null);

		interpreterToEdit.setName(interpreterNameText.getText());
		interpreterToEdit.setInstallLocation(new Path(interpreterLocationText.getText()));
		super.okPressed();
	}
	protected Control createDialogArea(Composite parent) {
		Composite composite = (Composite) super.createDialogArea(parent);
		GridLayout layout = new GridLayout();
		layout.numColumns = 3;
		composite.setLayout(layout);

		createNameEntryField(composite);
		createLocationEntryField(composite);
		
		return composite;
	}

}