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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.nodes.ControlFlowException;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.profiles.BranchProfile;
import org.jruby.truffle.language.RubyNode;
import org.jruby.truffle.language.control.RaiseException;
import org.jruby.truffle.language.control.RetryException;
import org.jruby.truffle.language.methods.ExceptionTranslatingNode;

public class TryNode extends RubyNode {

    @Child private RubyNode tryPart;
    @Children private final RescueNode[] rescueParts;
    @Child private RubyNode elsePart;

    @Child private SetExceptionVariableNode setExceptionVariableNode;

    private final BranchProfile elseProfile = BranchProfile.create();
    private final BranchProfile controlFlowProfile = BranchProfile.create();
    private final BranchProfile raiseExceptionProfile = BranchProfile.create();

    public TryNode(ExceptionTranslatingNode tryPart, RescueNode[] rescueParts, RubyNode elsePart) {
        this.tryPart = tryPart;
        this.rescueParts = rescueParts;
        this.elsePart = elsePart;
    }

    @Override
    public Object execute(VirtualFrame frame) {
        while (true) {
            Object result;

            try {
                result = tryPart.execute(frame);
            } catch (RaiseException exception) {
                raiseExceptionProfile.enter();

                try {
                    return handleException(frame, exception);
                } catch (RetryException e) {
                    getContext().getSafepointManager().poll(this);
                    continue;
                }
            } catch (ControlFlowException exception) {
                controlFlowProfile.enter();
                throw exception;
            }

            elseProfile.enter();

            if (elsePart != null) {
                result = elsePart.execute(frame);
            }

            return result;
        }
    }

    @ExplodeLoop
    private Object handleException(VirtualFrame frame, RaiseException exception) {
        for (RescueNode rescue : rescueParts) {
            if (rescue.canHandle(frame, exception.getException())) {
                return setLastExceptionAndRunRescue(frame, exception, rescue);
            }
        }

        throw exception;
    }

    private Object setLastExceptionAndRunRescue(VirtualFrame frame, RaiseException exception, RubyNode rescue) {
        if (setExceptionVariableNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            setExceptionVariableNode = insert(new SetExceptionVariableNode(getContext()));
        }

        return setExceptionVariableNode.setLastExceptionAndRun(frame, exception, rescue);
    }

}