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/*
 * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
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package com.oracle.truffle.js.nodes.binary;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.StandardTags.RootBodyTag;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.control.AbstractBlockNode;
import com.oracle.truffle.js.nodes.control.VoidBlockNode;
import com.oracle.truffle.js.nodes.control.ExprBlockNode;
import com.oracle.truffle.js.nodes.control.ResumableNode;
import com.oracle.truffle.js.nodes.control.SequenceNode;
import com.oracle.truffle.js.nodes.control.YieldException;

import java.util.Set;

@NodeInfo(cost = NodeCost.NONE)
public class DualNode extends JavaScriptNode implements SequenceNode, ResumableNode {

    @Child private JavaScriptNode left;
    @Child private JavaScriptNode right;

    public DualNode(JavaScriptNode left, JavaScriptNode right) {
        this.left = left;
        this.right = right;
    }

    public static JavaScriptNode create(JavaScriptNode left, JavaScriptNode right) {
        if (left instanceof DualNode && !(right instanceof DualNode || right instanceof AbstractBlockNode)) {
            // When de-sugaring certain inc/dec operations, we end up having two (nested) dual
            // nodes. In this case, rather than flattening the nodes in a block, we return the
            // nested dual nodes. In this way, they can be detected as expressions by instruments.
            return new DualNode(left, right);
        } else if (left instanceof DualNode || left instanceof AbstractBlockNode || right instanceof DualNode || right instanceof AbstractBlockNode) {
            final int len = getLen(left) + getLen(right);
            if (len > 2) {
                JavaScriptNode[] arr = new JavaScriptNode[len];
                int pos = 0;
                pos = flatten(arr, pos, left);
                pos = flatten(arr, pos, right);
                assert pos == len;
                return right instanceof VoidBlockNode ? VoidBlockNode.createVoidBlock(arr) : ExprBlockNode.createExprBlock(arr);
            }
        }
        return new DualNode(left, right);
    }

    private static int flatten(JavaScriptNode[] arr, int pos, JavaScriptNode node) {
        if (node.hasTag(RootBodyTag.class)) {
            arr[pos] = node;
            return pos + 1;
        } else if (node instanceof DualNode) {
            DualNode dual = (DualNode) node;
            arr[pos] = dual.left;
            arr[pos + 1] = dual.right;
            return pos + 2;
        } else if (node instanceof AbstractBlockNode) {
            AbstractBlockNode block = (AbstractBlockNode) node;
            int len = block.getStatements().length;
            System.arraycopy(block.getStatements(), 0, arr, pos, len);
            return pos + len;
        } else {
            arr[pos] = node;
            return pos + 1;
        }
    }

    private static int getLen(JavaScriptNode node) {
        if (node.hasTag(RootBodyTag.class)) {
            return 1;
        } else if (node instanceof DualNode) {
            return 2;
        } else if (node instanceof AbstractBlockNode) {
            return ((AbstractBlockNode) node).getStatements().length;
        } else {
            return 1;
        }
    }

    @Override
    public Object execute(VirtualFrame frame) {
        left.executeVoid(frame);
        return right.execute(frame);
    }

    @Override
    public int executeInt(VirtualFrame frame) throws UnexpectedResultException {
        left.executeVoid(frame);
        return right.executeInt(frame);
    }

    @Override
    public double executeDouble(VirtualFrame frame) throws UnexpectedResultException {
        left.executeVoid(frame);
        return right.executeDouble(frame);
    }

    @Override
    public boolean executeBoolean(VirtualFrame frame) throws UnexpectedResultException {
        left.executeVoid(frame);
        return right.executeBoolean(frame);
    }

    @Override
    public void executeVoid(VirtualFrame frame) {
        left.executeVoid(frame);
        right.executeVoid(frame);
    }

    @Override
    public JavaScriptNode[] getStatements() {
        return new JavaScriptNode[]{left, right};
    }

    @Override
    public Object resume(VirtualFrame frame) {
        int state = getStateAsIntAndReset(frame);
        if (state == 0) {
            left.executeVoid(frame);
            try {
                return right.execute(frame);
            } catch (YieldException e) {
                setState(frame, 1);
                throw e;
            }
        } else {
            assert state == 1;
            try {
                return right.execute(frame);
            } catch (YieldException e) {
                setState(frame, 1);
                throw e;
            }
        }
    }

    @Override
    public boolean isResultAlwaysOfType(Class clazz) {
        return right.isResultAlwaysOfType(clazz);
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set> materializedTags) {
        return new DualNode(cloneUninitialized(left, materializedTags), cloneUninitialized(right, materializedTags));
    }

    public JavaScriptNode getLeft() {
        return left;
    }

    public JavaScriptNode getRight() {
        return right;
    }
}