/*******************************************************************************
 * Copyright (c) 2004, 2013 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ant.internal.ui.model;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.RuntimeConfigurable;
import org.apache.tools.ant.Task;
import org.eclipse.ant.core.AntSecurityException;
import org.eclipse.ant.internal.ui.AntUIImages;
import org.eclipse.ant.internal.ui.IAntUIConstants;
import org.eclipse.ant.internal.ui.preferences.AntEditorPreferenceConstants;
import org.eclipse.jface.resource.ImageDescriptor;

public class AntTaskNode extends AntElementNode {

	private Task fTask = null;
	protected String fBaseLabel = null;
	protected String fLabel;
	private String fId = null;
	protected boolean fConfigured = false;

	public AntTaskNode(Task task) {
		super(task.getTaskName());
		fTask = task;
	}

	public AntTaskNode(Task task, String label) {
		super(task.getTaskName());
		fTask = task;
		fBaseLabel = label;
	}

	@Override
	public String getLabel() {
		if (fLabel == null) {
			StringBuffer label = new StringBuffer();
			if (fBaseLabel != null) {
				label.append(fBaseLabel);
			} else if (fId != null) {
				label.append(fId);
			} else {
				label.append(fTask.getTaskName());
			}
			if (isExternal()) {
				appendEntityName(label);
			}
			fLabel = label.toString();
		}
		return fLabel;
	}

	public void setBaseLabel(String label) {
		fBaseLabel = label;
	}

	public Task getTask() {
		return fTask;
	}

	public void setTask(Task task) {
		fTask = task;
	}

	@Override
	protected ImageDescriptor getBaseImageDescriptor() {
		if (fId != null) {
			return AntUIImages.getImageDescriptor(IAntUIConstants.IMG_ANT_TYPE);
		}

		return super.getBaseImageDescriptor();
	}

	/**
	 * The reference id for this task
	 * 
	 * @param id
	 *            The reference id for this task
	 */
	public void setId(String id) {
		fId = id;
	}

	/**
	 * Returns the reference id for this task or <code>null</code> if it has no reference id.
	 * 
	 * @return The reference id for this task
	 */
	public String getId() {
		return fId;
	}

	/**
	 * Configures the associated task if required. Allows subclasses to do specific configuration (such as executing the task) by calling
	 * <code>nodeSpecificConfigure</code>
	 * 
	 * @return whether the configuration of this node could have impact on other nodes
	 */
	public boolean configure(boolean validateFully) {
		if (getId() != null) {
			// ensure that references are set...new for Ant 1.7
			try {
				getProjectNode().getProject().getReference(getId());
			}
			catch (BuildException e) {
				handleBuildException(e, AntEditorPreferenceConstants.PROBLEM_TASKS);
			}
		}
		if (!validateFully || (getParentNode() instanceof AntTaskNode)) {
			return false;
		}
		if (fConfigured) {
			return false;
		}
		int severity = AntModelProblem.getSeverity(AntEditorPreferenceConstants.PROBLEM_TASKS);
		if (severity != AntModelProblem.NO_PROBLEM) {
			// only configure if the user cares about the problems
			try {
				getTask().maybeConfigure();
				fConfigured = true;
				return true;
			}
			catch (BuildException be) {
				handleBuildException(be, AntEditorPreferenceConstants.PROBLEM_TASKS);
			}
			catch (AntSecurityException se) {
				// either a system exit or setting of system property was attempted
				handleBuildException(new BuildException(AntModelMessages.AntTaskNode_0), AntEditorPreferenceConstants.PROBLEM_SECURITY);
			}
		}
		return false;
	}

	protected void handleBuildException(BuildException be, String preferenceKey) {
		int severity = AntModelProblem.getSeverity(preferenceKey);
		if (severity != AntModelProblem.NO_PROBLEM) {
			getAntModel().handleBuildException(be, this, severity);
		}
	}

	@Override
	public boolean containsOccurrence(String identifier) {
		RuntimeConfigurable wrapper = getTask().getRuntimeConfigurableWrapper();
		Map<String, Object> attributeMap = wrapper.getAttributeMap();
		Set<String> keys = attributeMap.keySet();
		boolean lookingForProperty = identifier.startsWith("${") && identifier.endsWith("}"); //$NON-NLS-1$ //$NON-NLS-2$
		for (Iterator<String> iter = keys.iterator(); iter.hasNext();) {
			String key = iter.next();
			String value = (String) attributeMap.get(key);
			if (lookingForProperty && (key.equals("if") || key.equals("unless"))) { //$NON-NLS-1$ //$NON-NLS-2$
				if (value.indexOf(identifier.substring(2, identifier.length() - 1)) != -1) {
					return true;
				}
			} else if (value.indexOf(identifier) != -1) {
				return true;
			}
		}
		StringBuffer text = wrapper.getText();
		if (text.length() > 0) {
			if (lookingForProperty && text.indexOf(identifier) != -1) {
				return true; // property ref in text
			}
		}

		return false;
	}

	@Override
	public List<Integer> computeIdentifierOffsets(String identifier) {
		String textToSearch = getAntModel().getText(getOffset(), getLength());
		if (textToSearch == null || textToSearch.length() == 0 || identifier.length() == 0) {
			return null;
		}
		List<Integer> results = new ArrayList<>();
		RuntimeConfigurable wrapper = getTask().getRuntimeConfigurableWrapper();
		Map<String, Object> attributeMap = wrapper.getAttributeMap();
		Set<String> keys = attributeMap.keySet();
		String lineSep = System.getProperty("line.separator"); //$NON-NLS-1$
		for (Iterator<String> iter = keys.iterator(); iter.hasNext();) {
			String key = iter.next();
			String value = (String) attributeMap.get(key);
			int identifierCorrection = 1;
			if (value.indexOf(identifier) != -1) {
				int keyOffset = textToSearch.indexOf(key);
				while (keyOffset > 0 && !Character.isWhitespace(textToSearch.charAt(keyOffset - 1))) {
					keyOffset = textToSearch.indexOf(key, keyOffset + 1);
				}
				int valueOffset = textToSearch.indexOf('"', keyOffset);
				int valueLine = ((AntModel) getAntModel()).getLine(getOffset() + valueOffset);

				int withinValueOffset = value.indexOf(identifier);
				while (withinValueOffset != -1) {
					int resultLine = ((AntModel) getAntModel()).getLine(getOffset() + valueOffset + withinValueOffset);
					// the value stored in the attribute map seems to be modified to not contain control characters
					// new lines, carriage returns and these are replaced with spaces
					// so if the line separator is greater than 1 in length we need to correct for this
					int resultOffset = getOffset() + valueOffset + withinValueOffset + identifierCorrection
							+ ((resultLine - valueLine) * (lineSep.length() - 1));
					results.add(Integer.valueOf(resultOffset));
					withinValueOffset = value.indexOf(identifier, withinValueOffset + 1);
				}
			}
		}

		String text = wrapper.getText().toString().trim();
		if (text.length() > 0) {
			int offset = textToSearch.indexOf(text.toString());
			offset = textToSearch.indexOf(identifier, offset);
			results.add(Integer.valueOf(offset + getOffset()));
		}
		return results;
	}
}