/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

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

import java.util.ArrayList;
import java.util.List;

import org.eclipse.ant.core.IAntClasspathEntry;

public class ClasspathModel extends AbstractClasspathEntry {

	public static final int ANT_HOME = 0;
	public static final int GLOBAL_USER = 1;
	public static final int USER = 2;
	public static final int CONTRIBUTED = 3;

	private GlobalClasspathEntries fAntHomeEntry;
	private GlobalClasspathEntries fUserGlobalEntry;
	private GlobalClasspathEntries fContributedGlobalEntry;

	public Object addEntry(Object entry) {
		if (entry instanceof GlobalClasspathEntries) {
			if (!fChildEntries.contains(entry)) {
				fChildEntries.add((IAntClasspathEntry) entry);
				return entry;
			}
			return null;
		}
		ClasspathEntry newEntry = createEntry(entry, null);
		for (IAntClasspathEntry element : fChildEntries) {
			if (element instanceof GlobalClasspathEntries) {
				if (((GlobalClasspathEntries) element).contains(newEntry)) {
					return null;
				}
			} else if (element.equals(newEntry)) {
				return null;
			}
		}
		fChildEntries.add(newEntry);
		return newEntry;
	}

	public Object addEntry(int entryType, Object entry) {
		IClasspathEntry entryParent = null;
		switch (entryType) {
			case ANT_HOME:
				if (fAntHomeEntry == null) {
					String name = AntPreferencesMessages.ClasspathModel_2;
					fAntHomeEntry = createGlobalEntry(new IAntClasspathEntry[0], name, false, true, ANT_HOME);
				}
				entryParent = fAntHomeEntry;
				break;
			case GLOBAL_USER:
				if (fUserGlobalEntry == null) {
					String name = AntPreferencesMessages.ClasspathModel_3;
					fUserGlobalEntry = createGlobalEntry(new IAntClasspathEntry[0], name, true, true, GLOBAL_USER);
				}
				entryParent = fUserGlobalEntry;
				break;
			case CONTRIBUTED:
				if (fContributedGlobalEntry == null) {
					String name = AntPreferencesMessages.ClasspathModel_0;
					fContributedGlobalEntry = createGlobalEntry(new IAntClasspathEntry[0], name, true, true, CONTRIBUTED);
				}
				entryParent = fContributedGlobalEntry;
				break;
			default:
				break;
		}

		ClasspathEntry newEntry = createEntry(entry, entryParent);
		for (IAntClasspathEntry element : fChildEntries) {
			if (element instanceof GlobalClasspathEntries) {
				if (((GlobalClasspathEntries) element).contains(newEntry)) {
					return null;
				}
			} else if (element.equals(newEntry)) {
				return null;
			}
		}
		if (entryParent != null) {
			((GlobalClasspathEntries) entryParent).addEntry(newEntry);
		} else {
			fChildEntries.add(newEntry);
		}
		return newEntry;
	}

	/**
	 * Returns entries of the specified kind, possibly empty.
	 * 
	 * @param entryType
	 *            kind of entries to retrieve
	 * @return entries of the specified kind, possibly empty
	 */
	public IAntClasspathEntry[] getEntries(int entryType) {
		switch (entryType) {
			case ANT_HOME:
				if (fAntHomeEntry != null) {
					return fAntHomeEntry.getEntries();
				}
				break;
			case GLOBAL_USER:
				if (fUserGlobalEntry != null) {
					return fUserGlobalEntry.getEntries();
				}
				break;
			case USER:
				return getUserEntries();
			case CONTRIBUTED:
				if (fContributedGlobalEntry != null) {
					return fContributedGlobalEntry.getEntries();
				}
				break;
			default:
				break;
		}
		return new IAntClasspathEntry[0];
	}

	public void remove(Object entry) {
		fChildEntries.remove(entry);
		if (entry == fUserGlobalEntry) {
			fUserGlobalEntry = null;
		}
	}

	public ClasspathEntry createEntry(Object entry, IClasspathEntry entryParent) {
		if (entryParent == null) {
			entryParent = this;
		}
		return new ClasspathEntry(entry, entryParent);
	}

	public void removeAll() {
		if (fAntHomeEntry != null) {
			fAntHomeEntry.removeAll();
		}
		if (fUserGlobalEntry != null) {
			fUserGlobalEntry.removeAll();
		}
	}

	public void removeAll(int entryType) {
		switch (entryType) {
			case ANT_HOME:
				if (fAntHomeEntry != null) {
					fAntHomeEntry.removeAll();
				}
				break;
			case GLOBAL_USER:
				if (fUserGlobalEntry != null) {
					fUserGlobalEntry.removeAll();
				}
				break;
			default:
				break;
		}
	}

	public void removeAll(Object[] entries) {

		for (Object object : entries) {
			if (object instanceof ClasspathEntry) {
				IClasspathEntry entryParent = ((ClasspathEntry) object).getParent();
				if (entryParent instanceof GlobalClasspathEntries) {
					((GlobalClasspathEntries) entryParent).removeEntry((ClasspathEntry) object);
				} else {
					remove(object);
				}
			} else {
				remove(object);
			}
		}
	}

	public void setAntHomeEntries(IAntClasspathEntry[] entries) {
		if (fAntHomeEntry == null) {
			String name = AntPreferencesMessages.ClasspathModel_2;
			fAntHomeEntry = createGlobalEntry(entries, name, false, true, ANT_HOME);
		} else {
			fAntHomeEntry.removeAll();
			for (IAntClasspathEntry entry : entries) {
				fAntHomeEntry.addEntry(new ClasspathEntry(entry, fAntHomeEntry));
			}
		}
	}

	private GlobalClasspathEntries createGlobalEntry(IAntClasspathEntry[] entries, String name, boolean canBeRemoved, boolean addEntry, int type) {

		GlobalClasspathEntries global = new GlobalClasspathEntries(name, this, canBeRemoved, type);

		for (IAntClasspathEntry entry : entries) {
			global.addEntry(new ClasspathEntry(entry, global));
		}

		if (addEntry) {
			addEntry(global);
		}
		return global;
	}

	public void setGlobalEntries(IAntClasspathEntry[] entries) {
		if (fUserGlobalEntry == null) {
			String name = AntPreferencesMessages.ClasspathModel_3;
			fUserGlobalEntry = createGlobalEntry(entries, name, true, true, GLOBAL_USER);
		} else {
			fUserGlobalEntry.removeAll();
			for (IAntClasspathEntry entry : entries) {
				fUserGlobalEntry.addEntry(new ClasspathEntry(entry, fUserGlobalEntry));
			}
		}
	}

	public void setContributedEntries(IAntClasspathEntry[] entries) {
		if (fContributedGlobalEntry == null) {
			String name = AntPreferencesMessages.ClasspathModel_0;
			fContributedGlobalEntry = createGlobalEntry(entries, name, false, true, CONTRIBUTED);
		} else {
			fContributedGlobalEntry.removeAll();
			for (IAntClasspathEntry entry : entries) {
				fContributedGlobalEntry.addEntry(new ClasspathEntry(entry, fContributedGlobalEntry));
			}
		}
	}

	private IAntClasspathEntry[] getUserEntries() {
		List<IAntClasspathEntry> userEntries = new ArrayList<>(fChildEntries.size());
		for (IAntClasspathEntry element : fChildEntries) {
			if (element instanceof GlobalClasspathEntries) {
				continue;
			}
			userEntries.add(element);
		}
		return userEntries.toArray(new IAntClasspathEntry[userEntries.size()]);
	}
}