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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 Chad Fowler 
 * Copyright (C) 2001 Alan Moore 
 * Copyright (C) 2001-2004 Jan Arne Petersen 
 * Copyright (C) 2002-2004 Anders Bengtsson 
 * Copyright (C) 2002-2005 Thomas E Enebo 
 * Copyright (C) 2004 Stefan Matthias Aust 
 * Copyright (C) 2005 Charles O Nutter 
 * 
 * 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
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 * the provisions above, a recipient may use your version of this file under
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package org.jruby;

import java.util.HashSet;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.Binding;
import org.jruby.runtime.Block;
import org.jruby.runtime.ClassIndex;
import org.jruby.runtime.DynamicScope;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.IdUtil;

/**
 * @author  jpetersen
 */
@JRubyClass(name="Binding")
public class RubyBinding extends RubyObject {
    private Binding binding;

    public RubyBinding(Ruby runtime, RubyClass rubyClass, Binding binding) {
        super(runtime, rubyClass);
        
        this.binding = binding;
    }

    private RubyBinding(Ruby runtime, RubyClass rubyClass) {
        super(runtime, rubyClass);
    }
    
    private static ObjectAllocator BINDING_ALLOCATOR = new ObjectAllocator() {
        @Override
        public IRubyObject allocate(Ruby runtime, RubyClass klass) {
            RubyBinding instance = new RubyBinding(runtime, klass);
            
            return instance;
        }
    };
    
    public static RubyClass createBindingClass(Ruby runtime) {
        RubyClass bindingClass = runtime.defineClass("Binding", runtime.getObject(), BINDING_ALLOCATOR);
        runtime.setBinding(bindingClass);

        bindingClass.setClassIndex(ClassIndex.BINDING);
        bindingClass.setReifiedClass(RubyBinding.class);
        
        bindingClass.defineAnnotatedMethods(RubyBinding.class);
        bindingClass.getSingletonClass().undefineMethod("new");
        
        return bindingClass;
    }

    public Binding getBinding() {
        return binding;
    }

    // Proc class

    public static RubyBinding newBinding(Ruby runtime, Binding binding) {
        return new RubyBinding(runtime, runtime.getBinding(), binding);
    }

    @Deprecated
    public static RubyBinding newBinding(Ruby runtime) {
        return newBinding(runtime, runtime.getCurrentContext().currentBinding());
    }

    @Deprecated
    public static RubyBinding newBinding(Ruby runtime, IRubyObject self) {
       return newBinding(runtime, runtime.getCurrentContext().currentBinding(self));
    }
    
    @JRubyMethod(name = "initialize", visibility = Visibility.PRIVATE)
    @Override
    public IRubyObject initialize(ThreadContext context) {
        binding = context.currentBinding();
        
        return this;
    }
    
    @JRubyMethod(name = "initialize_copy", required = 1, visibility = Visibility.PRIVATE)
    @Override
    public IRubyObject initialize_copy(IRubyObject other) {
        RubyBinding otherBinding = (RubyBinding)other;
        
        binding = otherBinding.binding.clone();
        
        return this;
    }

    // c: bind_eval
    @JRubyMethod(name = "eval", required=1, optional=2)
    public IRubyObject eval(ThreadContext context, IRubyObject[] args) {
        IRubyObject[] newArgs = new IRubyObject[args.length+1];
        newArgs[0] = args[0]; // eval string
        newArgs[1] = this; // binding
        if(args.length>1) {
            newArgs[2] = args[1]; // file
            if(args.length>2) {
                newArgs[3] = args[2]; // line
            }
        }

        return RubyKernel.eval(context, this, newArgs, Block.NULL_BLOCK);
    }

    @JRubyMethod(name = "local_variable_defined?")
    public IRubyObject local_variable_defined_p(ThreadContext context, IRubyObject symbol) {
        return context.runtime.newBoolean(binding.getEvalScope(context.runtime).getStaticScope().isDefined(symbol.asJavaString()) != -1);
    }

    @JRubyMethod
    public IRubyObject local_variable_get(ThreadContext context, IRubyObject symbol) {
        String name = symbol.asJavaString().intern();
        DynamicScope evalScope = binding.getEvalScope(context.runtime);
        int slot = evalScope.getStaticScope().isDefined(name);

        if (slot == -1) throw context.runtime.newNameError("local variable `" + name +  "' not defined for " + inspect(), name);

        return evalScope.getValueOrNil(slot & 0xffff, slot >> 16, context.nil);
    }

    @JRubyMethod
    public IRubyObject local_variable_set(ThreadContext context, IRubyObject symbol, IRubyObject value) {
        String name = symbol.asJavaString().intern();
        DynamicScope evalScope = binding.getEvalScope(context.runtime);
        int slot = evalScope.getStaticScope().isDefined(name);

        if (slot == -1) { // Yay! New variable associated with this binding
            slot = evalScope.getStaticScope().addVariable(name.intern());
            evalScope.growIfNeeded();
        }

        return evalScope.setValue(slot & 0xffff, value, slot >> 16);
    }

    @JRubyMethod
    public IRubyObject local_variables(ThreadContext context) {
        final Ruby runtime = context.runtime;
        HashSet encounteredLocalVariables = new HashSet<>();
        RubyArray allLocalVariables = runtime.newArray();
        DynamicScope currentScope = binding.getEvalScope(context.runtime);

        while (currentScope != null) {
            for (String name : currentScope.getStaticScope().getVariables()) {
                if (IdUtil.isLocal(name) && !encounteredLocalVariables.contains(name)) {
                    allLocalVariables.push(runtime.newSymbol(name));
                    encounteredLocalVariables.add(name);
                }
            }
            currentScope = currentScope.getParentScope();
        }

        return allLocalVariables;
    }

    @JRubyMethod(name = "receiver")
    public IRubyObject receiver(ThreadContext context) {
        return binding.getSelf();
    }
}