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/***** BEGIN LICENSE BLOCK *****
 * Version: EPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2004 Charles O Nutter 
 * Copyright (C) 2004 Stefan Matthias Aust 
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
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package org.jruby;

import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyClass;
import org.jruby.internal.runtime.methods.DynamicMethod;
import org.jruby.internal.runtime.methods.ProcMethod;
import org.jruby.runtime.Block;
import org.jruby.runtime.ClassIndex;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

/**
 * 
 * Note: This was renamed from UnboundMethod.java
 * 
 * @author jpetersen
 */
@JRubyClass(name="UnboundMethod", parent="Method")
public class RubyUnboundMethod extends AbstractRubyMethod {
    protected RubyUnboundMethod(Ruby runtime) {
        super(runtime, runtime.getUnboundMethod());
    }

    public static RubyUnboundMethod newUnboundMethod(
        RubyModule implementationModule,
        String methodName,
        RubyModule originModule,
        String originName,
        DynamicMethod method) {
        RubyUnboundMethod newMethod = new RubyUnboundMethod(implementationModule.getRuntime());

        newMethod.implementationModule = implementationModule;
        newMethod.methodName = methodName;
        newMethod.originModule = originModule;
        newMethod.originName = originName;
        newMethod.method = method;

        return newMethod;
    }

    public static RubyClass defineUnboundMethodClass(Ruby runtime) {
        RubyClass newClass = 
        	runtime.defineClass("UnboundMethod", runtime.getObject(), ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);
        runtime.setUnboundMethod(newClass);

        newClass.setClassIndex(ClassIndex.UNBOUNDMETHOD);
        newClass.setReifiedClass(RubyUnboundMethod.class);

        newClass.defineAnnotatedMethods(AbstractRubyMethod.class);
        newClass.defineAnnotatedMethods(RubyUnboundMethod.class);

        newClass.getSingletonClass().undefineMethod("new");

        return newClass;
    }

    @JRubyMethod(name = "==", required = 1)
    @Override
    public RubyBoolean op_equal(ThreadContext context, IRubyObject other) {
        if (!(other instanceof AbstractRubyMethod)) {
            return context.runtime.getFalse();
        }
        if (method instanceof ProcMethod) {
            return context.runtime.newBoolean(((ProcMethod) method).isSame(((AbstractRubyMethod) other).getMethod()));
        }
        AbstractRubyMethod otherMethod = (AbstractRubyMethod)other;
        return context.runtime.newBoolean(
                originModule == otherMethod.originModule &&
                method.getRealMethod().getSerialNumber() == otherMethod.method.getRealMethod().getSerialNumber());
    }

    @JRubyMethod
    public RubyMethod bind(ThreadContext context, IRubyObject aReceiver) {
        RubyClass receiverClass = aReceiver.getMetaClass();
        
        receiverClass.checkValidBindTargetFrom(context, implementationModule);
        
        return RubyMethod.newMethod(implementationModule, methodName, receiverClass, originName, method, aReceiver);
    }

    @JRubyMethod(name = "clone")
    @Override
    public RubyUnboundMethod rbClone() {
        return newUnboundMethod(implementationModule, methodName, originModule, originName, method);
    }

    @JRubyMethod(name = {"inspect", "to_s"})
    @Override
    public IRubyObject inspect() {
        StringBuilder buf = new StringBuilder("#<");
        char delimeter = '#';

        buf.append(getMetaClass().getRealClass().getName()).append(": ");

        if (implementationModule.isSingleton()) {
            buf.append(implementationModule.inspect().toString());
        } else {
            buf.append(originModule.getName());

            if (implementationModule != originModule) {
                buf.append('(').append(implementationModule.getName()).append(')');
            }
        }

        buf.append(delimeter).append(methodName).append('>');

        RubyString str = getRuntime().newString(buf.toString());
        str.setTaint(isTaint());
        return str;
    }

    @JRubyMethod
    public IRubyObject super_method(ThreadContext context ) {
        return super_method(context, null, implementationModule.getSuperClass());
    }
}