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/***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (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-v20.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) 2001 Alan Moore 
 * Copyright (C) 2001-2002 Jan Arne Petersen 
 * Copyright (C) 2002 Anders Bengtsson 
 * 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"),
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package org.jruby;

import org.jruby.anno.JRubyMethod;
import org.jruby.internal.runtime.methods.AliasMethod;
import org.jruby.internal.runtime.methods.DynamicMethod;
import org.jruby.internal.runtime.methods.IRMethodArgs;
import org.jruby.internal.runtime.methods.UndefinedMethod;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.PositionAware;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.marshal.DataType;

/**
 * @see RubyMethod
 * @see RubyUnboundMethod
 */
public abstract class AbstractRubyMethod extends RubyObject implements DataType {
    protected RubyModule implementationModule;
    protected String methodName;
    protected RubyModule originModule;
    protected String originName;
    protected DynamicMethod method;

    protected AbstractRubyMethod(Ruby runtime, RubyClass rubyClass) {
        super(runtime, rubyClass);
    }

    public DynamicMethod getMethod() {
        return method;
    }

    /** Returns the number of arguments a method accepted.
     * 
     * @return the number of arguments of a method.
     */
    @JRubyMethod(name = "arity")
    public RubyFixnum arity() {
        int value;
        if (method instanceof IRMethodArgs) {
            value = ((IRMethodArgs) method).getSignature().arityValue();
        } else {
            value = method.getArity().getValue();
        }

        return getRuntime().newFixnum(value);
    }

    @Deprecated
    public final IRubyObject op_eql19(ThreadContext context, IRubyObject other) {
        return op_eql(context, other);
    }

    @JRubyMethod(name = "eql?", required = 1)
    public IRubyObject op_eql(ThreadContext context, IRubyObject other) {
        return context.runtime.newBoolean( equals(other) );
    }

    @Override
    public boolean equals(Object other) {
        return this == other;
    }

    public abstract AbstractRubyMethod rbClone();

    @JRubyMethod(name = "name")
    public IRubyObject name(ThreadContext context) {
        return context.runtime.newSymbol(methodName);
    }

    public String getMethodName() {
        return methodName;
    }

    @JRubyMethod(name = "owner")
    public IRubyObject owner(ThreadContext context) {
        return implementationModule;
    }

    @JRubyMethod(name = "source_location")
    public IRubyObject source_location(ThreadContext context) {
        Ruby runtime = context.runtime;

        String filename = getFilename();
        if (filename != null) {
            return runtime.newArray(runtime.newString(filename), runtime.newFixnum(getLine()));
        }

        return context.nil;
    }

    public String getFilename() {
        DynamicMethod realMethod = method.getRealMethod(); // Follow Aliases
        if (realMethod instanceof PositionAware) {
            PositionAware poser = (PositionAware) realMethod;
            return poser.getFile();
        }
        return null;
    }

    public int getLine() {
        DynamicMethod realMethod = method.getRealMethod(); // Follow Aliases
        if (realMethod instanceof PositionAware) {
            PositionAware poser = (PositionAware) realMethod;
            return poser.getLine() + 1;
        }
        return -1;
    }

    @JRubyMethod(name = "parameters")
    public IRubyObject parameters(ThreadContext context) {
        return Helpers.methodToParameters(context.runtime, this);
    }

    protected IRubyObject super_method(ThreadContext context, IRubyObject receiver, RubyModule superClass) {
        if (superClass == null) return context.nil;

        DynamicMethod newMethod = superClass.searchMethod(methodName);
        if (newMethod == UndefinedMethod.INSTANCE) return context.nil;

        if (receiver == null) {
            return RubyUnboundMethod.newUnboundMethod(superClass, methodName, superClass, originName, newMethod);
        } else {
            return RubyMethod.newMethod(superClass, methodName, superClass, originName, newMethod, receiver);
        }
    }

    @JRubyMethod
    public IRubyObject original_name(ThreadContext context) {
        if (method instanceof AliasMethod) {
            return context.runtime.newSymbol(((AliasMethod) method).getOldName());
        }

        return context.runtime.newSymbol(method.getName());
    }
}