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function FNode() {
    /**
     * @type {FNode}
     */
    this.parent = null;

    /**
     * @type {Array<FNode>}
     */
    this.children = [];
}


FNode.prototype.onDetach = function () {/* NOOP */
};
FNode.prototype.onDetached = function () {/* NOOP */
};

FNode.prototype.onAttach = function () {/* NOOP */
};
FNode.prototype.onAttached = function () {/* NOOP */
};


/**
 * @param {FNode} child
 * @param {Number} index
 */
FNode.prototype.onRemoveChild = function (child, index) {
}


/**
 * @param {FNode} child
 * @param {Number} index
 */
FNode.prototype.onAddChild = function (child, index) {
};

/**
 * @return {FNode}
 */
FNode.prototype.remove = function () {
    if (this.parent)
        this.parent.removeChild(this);
};

/**
 * @param {FNode} child
 * @return {FNode}
 */
FNode.prototype.addChild = function (child) {
    child.remove();
    this.children.push(child);
    child.parent = this;
    //data ready
    child.onAttach();
    this.onAddChild(child, -1);//negative index for appending child
    child.onAttached();
};


/**
 * @param {FNode} child
 * @return {Boolean}
 */
FNode.prototype.removeChild = function (child) {
    var childIndex = this.children.indexOf(child);
    if (childIndex < 0) return false;
    this.children.splice(childIndex, 1);
    child.onDetach(this);
    this.onRemoveChild(child, childIndex);
    child.parent = undefined;
    child.onDetached(this);
    return true;
};


/**
 * @param {FNode} child
 * @param {FNode} at
 * @return {FNode}
 */
FNode.prototype.addChildBefore = function (child, at) {
    child.remove();
    var atIndex = this.children.indexOf(at);
    if (atIndex >= 0) {
        this.children.splice(atIndex, 0, child);
        child.parent = this;
        this.onAttach();
        this.onAddChild(child, atIndex);
        child.onAttached();
        return true;
    }
    return false;
};


/**
 * @param {FNode} child
 * @param {FNode} at
 * @return {FNode}
 */
FNode.prototype.addChildAfter = function (child, at) {
    child.remove();
    var atIndex = this.children.indexOf(at);
    if (atIndex >= 0) {
        this.children.splice(atIndex + 1, 0, child);
        child.parent = this;
        this.onAttach();
        this.onAddChild(child, atIndex + 1);
        child.onAttached();
        return true;
    }
    return false;
};


/**
 * @param {FNode} child
 * @return {FNode}
 */
FNode.prototype.findChildBefore = function (child) {
    var index = this.children.indexOf(child);
    if (index > 0) return this.children[index - 1];
};


/**
 * @param {FNode} child
 * @return {FNode}
 */
FNode.prototype.findChildAfter = function (child) {
    var index = this.children.indexOf(child);
    if (index < this.children.length - 1) return this.children[index + 1];
};


/**
 * @param {FNode} child
 * @return {Number}
 */
FNode.prototype.indexOfChild = function (child) {
    return this.children.indexOf(child);
};


export default FNode;


/***
 *
 *
 * @param  {FNode} root
 * @param cb
 */
export function traversal(root, cb) {
    var ac = {
        path: [], node: null,
        isStopped: false,
        stop: function () {
            this.isStopped = true;
        },
        isSkipChildren: false,
        skipChildren: function () {
            this.isSkipChildren = true;
        }
    };

    function visit(node) {
        ac.path.push(node);
        ac.node = node;
        ac.isSkipChildren = false;
        ac.isStopped = false;
        cb(ac);
        if (!ac.isSkipChildren) {
            if (node.children)
                for (var i = 0; i < node.children.length && !ac.isStopped; ++i) {
                    visit(node.children[i]);
                }
        }
        ac.node = ac.path.pop();
    }

    visit(root);
}