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/*
 * Copyright (c) 2013, 2017 Oracle and/or its affiliates. All rights reserved. This
 * code is released under a tri EPL/GPL/LGPL license. You can use it,
 * redistribute it and/or modify it under the terms of the:
 *
 * Eclipse Public License version 1.0
 * GNU General Public License version 2
 * GNU Lesser General Public License version 2.1
 */
package org.jruby.truffle.language.exceptions;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.profiles.BranchProfile;
import org.jruby.truffle.core.cast.BooleanCastNode;
import org.jruby.truffle.core.cast.BooleanCastNodeGen;
import org.jruby.truffle.language.RubyGuards;
import org.jruby.truffle.language.RubyNode;
import org.jruby.truffle.language.control.RaiseException;
import org.jruby.truffle.language.dispatch.CallDispatchHeadNode;
import org.jruby.truffle.language.dispatch.DispatchHeadNodeFactory;

public abstract class RescueNode extends RubyNode {

    @Child private RubyNode rescueBody;

    @Child private CallDispatchHeadNode callTripleEqualsNode;
    @Child private BooleanCastNode booleanCastNode;

    private final BranchProfile errorProfile = BranchProfile.create();

    public RescueNode(RubyNode rescueBody) {
        this.rescueBody = rescueBody;
    }

    public abstract boolean canHandle(VirtualFrame frame, DynamicObject exception);

    @Override
    public Object execute(VirtualFrame frame) {
        return rescueBody.execute(frame);
    }

    protected boolean matches(VirtualFrame frame, Object exception, Object handlingClass) {
        if (!RubyGuards.isRubyModule(handlingClass)) {
            errorProfile.enter();
            throw new RaiseException(coreExceptions().typeErrorRescueInvalidClause(this));
        }

        if (callTripleEqualsNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            callTripleEqualsNode = insert(DispatchHeadNodeFactory.createMethodCall());
            booleanCastNode = insert(BooleanCastNodeGen.create(null));
        }

        return booleanCastNode.executeToBoolean(callTripleEqualsNode.call(frame, handlingClass, "===", exception));
    }

}