/* *******************************************************************
 * Copyright (c) 2004, 2013 IBM Corporation
 *
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *    Andy Clement     initial implementation
 * ******************************************************************/
package org.aspectj.apache.bcel.classfile.annotation;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.aspectj.apache.bcel.classfile.ConstantPool;
import org.aspectj.apache.bcel.classfile.ConstantUtf8;
import org.aspectj.apache.bcel.classfile.Utility;
import org.aspectj.apache.bcel.generic.ObjectType;

public class AnnotationGen {
	public static final AnnotationGen[] NO_ANNOTATIONS = new AnnotationGen[0];

	private int typeIndex;
	private List<NameValuePair> pairs = Collections.emptyList();
	private ConstantPool cpool;
	private boolean isRuntimeVisible = false;

	public AnnotationGen(AnnotationGen a, ConstantPool cpool, boolean copyPoolEntries) {
		this.cpool = cpool;
		if (copyPoolEntries) {
			typeIndex = cpool.addUtf8(a.getTypeSignature());
		} else {
			typeIndex = a.getTypeIndex();
		}
		isRuntimeVisible = a.isRuntimeVisible();
		pairs = copyValues(a.getValues(), cpool, copyPoolEntries);
	}

	private List<NameValuePair> copyValues(List<NameValuePair> in, ConstantPool cpool, boolean copyPoolEntries) {
		List<NameValuePair> out = new ArrayList<>();
		for (NameValuePair nvp : in) {
			out.add(new NameValuePair(nvp, cpool, copyPoolEntries));
		}
		return out;
	}

	private AnnotationGen(ConstantPool cpool) {
		this.cpool = cpool;
	}

	/**
	 * Retrieve an immutable version of this AnnotationGen
	 */
	public AnnotationGen(ObjectType type, List<NameValuePair> pairs, boolean runtimeVisible, ConstantPool cpool) {
		this.cpool = cpool;
		if (type != null) {
			this.typeIndex = cpool.addUtf8(type.getSignature()); // Only null for funky *temporary* FakeAnnotation objects
		}
		this.pairs = pairs;
		isRuntimeVisible = runtimeVisible;
	}

	public static AnnotationGen read(DataInputStream dis, ConstantPool cpool, boolean b) throws IOException {
		AnnotationGen a = new AnnotationGen(cpool);
		a.typeIndex = dis.readUnsignedShort();
		int elemValuePairCount = dis.readUnsignedShort();
		for (int i = 0; i < elemValuePairCount; i++) {
			int nidx = dis.readUnsignedShort();
			a.addElementNameValuePair(new NameValuePair(nidx, ElementValue.readElementValue(dis, cpool), cpool));
		}
		a.isRuntimeVisible(b);
		return a;
	}

	public void dump(DataOutputStream dos) throws IOException {
		dos.writeShort(typeIndex); // u2 index of type name in cpool
		dos.writeShort(pairs.size()); // u2 element_value pair count
		for (NameValuePair envp : pairs) {
			envp.dump(dos);
		}
	}

	public void addElementNameValuePair(NameValuePair evp) {
		if (pairs == Collections.EMPTY_LIST) {
			pairs = new ArrayList<>();
		}
		pairs.add(evp);
	}

	public int getTypeIndex() {
		return typeIndex;
	}

	public String getTypeSignature() {
		ConstantUtf8 utf8 = (ConstantUtf8) cpool.getConstant(typeIndex);
		return utf8.getValue();
	}

	public String getTypeName() {
		return Utility.signatureToString(getTypeSignature());
	}

	public List<NameValuePair> getValues() {
		return pairs;
	}

	@Override
	public String toString() {
		StringBuilder s = new StringBuilder();
		s.append("AnnotationGen:[" + getTypeName() + " #" + pairs.size() + " {");
		for (int i = 0; i < pairs.size(); i++) {
			s.append(pairs.get(i));
			if (i + 1 < pairs.size())
				s.append(",");
		}
		s.append("}]");
		return s.toString();
	}

	public String toShortString() {
		StringBuilder s = new StringBuilder();
		s.append("@").append(getTypeName());
		if (pairs.size()!=0) {
			s.append("(");
			for (int i = 0; i < pairs.size(); i++) {
				s.append(pairs.get(i));
				if (i + 1 < pairs.size())
					s.append(",");
			}
			s.append(")");
		}
		return s.toString();
	}

	private void isRuntimeVisible(boolean b) {
		isRuntimeVisible = b;
	}

	public boolean isRuntimeVisible() {
		return isRuntimeVisible;
	}

	/**
	 * @return true if the annotation has a value with the specified name and (toString'd) value
	 */
	public boolean hasNameValuePair(String name, String value) {
		for (NameValuePair pair : pairs) {
			if (pair.getNameString().equals(name)) {
				if (pair.getValue().stringifyValue().equals(value)) {
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * @return true if the annotation has a value with the specified name
	 */
	public boolean hasNamedValue(String name) {
		for (NameValuePair pair : pairs) {
			if (pair.getNameString().equals(name)) {
				return true;
			}
		}
		return false;
	}
}