/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpdt.internal.core.builder;

import net.sourceforge.phpdt.core.compiler.CharOperation;
import net.sourceforge.phpdt.internal.compiler.env.ICompilationUnit;
import net.sourceforge.phpdt.internal.compiler.problem.AbortCompilation;
import net.sourceforge.phpdt.internal.core.util.Util;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;

public class SourceFile implements ICompilationUnit {

	IFile resource;

	ClasspathMultiDirectory sourceLocation;

	String initialTypeName;

	String encoding;

	public SourceFile(IFile resource, ClasspathMultiDirectory sourceLocation,
			String encoding) {
		this.resource = resource;
		this.sourceLocation = sourceLocation;
		this.initialTypeName = extractTypeName();
		this.encoding = encoding;
	}

	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (!(o instanceof SourceFile))
			return false;

		SourceFile f = (SourceFile) o;
		return sourceLocation == f.sourceLocation
				&& resource.getFullPath().equals(f.resource.getFullPath());
	}

	String extractTypeName() {
		// answer a String with the qualified type name for the source file in
		// the
		// form: 'p1/p2/A'
		IPath fullPath = resource.getFullPath();
		int resourceSegmentCount = fullPath.segmentCount();
		int sourceFolderSegmentCount = sourceLocation.sourceFolder
				.getFullPath().segmentCount();
		String extension = fullPath.getFileExtension();
		int ext_length = extension == null ? 0 : extension.length() + 1;
		int charCount = (resourceSegmentCount - sourceFolderSegmentCount - 1)
				- ext_length; // length
		// of
		// ".php"
		for (int i = sourceFolderSegmentCount; i < resourceSegmentCount; i++)
			charCount += fullPath.segment(i).length();

		char[] result = new char[charCount];
		int offset = 0;
		resourceSegmentCount--; // deal with the last segment separately
		for (int i = sourceFolderSegmentCount; i < resourceSegmentCount; i++) {
			String segment = fullPath.segment(i);
			int size = segment.length();
			segment.getChars(0, size, result, offset);
			offset += size;
			result[offset++] = '/';
		}
		String segment = fullPath.segment(resourceSegmentCount);
		int size = segment.length() - ext_length; // length of ".php"
		segment.getChars(0, size, result, offset);
		return new String(result);
	}

	public char[] getContents() {

		try {
			return Util.getResourceContentsAsCharArray(resource, this.encoding);
		} catch (CoreException e) {
			throw new AbortCompilation(true, new MissingSourceFileException(
					resource.getFullPath().toString()));
		}
	}

	public char[] getFileName() {
		return resource.getFullPath().toString().toCharArray(); // do not know
																// what
		// you want to
		// return here
	}

	public char[] getMainTypeName() {
		char[] typeName = initialTypeName.toCharArray();
		int lastIndex = CharOperation.lastIndexOf('/', typeName);
		return CharOperation.subarray(typeName, lastIndex + 1, -1);
	}

	public char[][] getPackageName() {
		char[] typeName = initialTypeName.toCharArray();
		int lastIndex = CharOperation.lastIndexOf('/', typeName);
		return CharOperation.splitOn('/', typeName, 0, lastIndex);
	}

	String typeLocator() {
		return resource.getProjectRelativePath().toString();
	}

	public String toString() {
		return "SourceFile[" //$NON-NLS-1$
				+ resource.getFullPath() + "]"; //$NON-NLS-1$
	}

	public IResource getResource() {
		return resource;
	}

}