function isMissingChildren(startingNode, checkNode, checkReferenceParent) {
    /*
    This functioin scan all the children of a node and returns true or false
    depending if the checkNode is a missing children. 
    */
    if (startingNode === undefined) { return }
    if (checkNode === undefined) { return }

    let nodeDefinition = APP_SCHEMA_MAP.get(startingNode.type)
    if (nodeDefinition === undefined) { return }

    /* We scan through this node children */
    if (nodeDefinition.properties !== undefined) {
        for (let i = 0; i < nodeDefinition.properties.length; i++) {
            let property = nodeDefinition.properties[i]

            switch (property.type) {
                case 'node': {
                    let child = startingNode[property.name]
                    if (child === undefined) { continue }
                    if (checkReferenceParent !== true) {
                        if (child.id === checkNode.id) {
                            return false
                        }
                    } else {
                        if (child.payload !== undefined) {
                            if (child.payload.referenceParent !== undefined) {
                                if (child.payload.referenceParent.id === checkNode.id) {
                                    return false
                                }
                            }
                        }
                    }
                }
                    break
                case 'array': {
                    let startingNodePropertyArray = startingNode[property.name]
                    if (startingNodePropertyArray !== undefined) {
                        for (let m = 0; m < startingNodePropertyArray.length; m++) {
                            let arrayItem = startingNodePropertyArray[m]
                            if (checkReferenceParent !== true) {
                                if (arrayItem.id === checkNode.id) {
                                    return false
                                }
                            } else {
                                if (arrayItem.payload !== undefined) {
                                    if (arrayItem.payload.referenceParent !== undefined) {
                                        if (arrayItem.payload.referenceParent.id === checkNode.id) {
                                            return false
                                        }
                                    }
                                }
                            }
                        }
                    }
                    break
                }
            }
        }
        return true
    }
}

function findChildReferencingThisNode(startingNode, checkNode) {
    /*
    This functioin scan all the children of a node and returns the child
    that is referencing the checkNode. 
    */
    if (startingNode === undefined) { return }
    if (checkNode === undefined) { return }

    let nodeDefinition = APP_SCHEMA_MAP.get(startingNode.type)
    if (nodeDefinition === undefined) { return }

    /* We scan through this node children */
    if (nodeDefinition.properties !== undefined) {
        for (let i = 0; i < nodeDefinition.properties.length; i++) {
            let property = nodeDefinition.properties[i]

            switch (property.type) {
                case 'node': {
                    let child = startingNode[property.name]

                    if (child.payload !== undefined) {
                        if (child.payload.referenceParent !== undefined) {
                            if (child.payload.referenceParent.id === checkNode.id) {
                                return child
                            }
                        }
                    }
                }
                    break
                case 'array': {
                    let startingNodePropertyArray = startingNode[property.name]
                    if (startingNodePropertyArray !== undefined) {
                        for (let m = 0; m < startingNodePropertyArray.length; m++) {
                            let arrayItem = startingNodePropertyArray[m]

                            if (arrayItem.payload !== undefined) {
                                if (arrayItem.payload.referenceParent !== undefined) {
                                    if (arrayItem.payload.referenceParent.id === checkNode.id) {
                                        return arrayItem
                                    }
                                }
                            }
                        }
                    }
                    break
                }
            }
        }
        return true
    }
}

function findOrCreateChildWithReference(startingNode, childType, referencedNode, functionLibraryUiObjectsFromNodes) {
    /*
    This function find the child node of starting node that references
    refereced node. If there is none, then it creates a child and stablish
    the referecen.
    */
    let child
    if (isMissingChildren(startingNode, referencedNode, true) === true) {
        child = functionLibraryUiObjectsFromNodes.addUIObject(startingNode, childType)
        child.payload.referenceParent = referencedNode
    } else {
        child = findChildReferencingThisNode(startingNode, referencedNode)
    }
    return child
}

function findAndRecreateChildWithReference(startingNode, childType, referencedNode, rootNodes, functionLibraryUiObjectsFromNodes, functionLibraryNodeDeleter) {
    /* 
    This function finds the child of the starting node that references
    the reference node and if found it deletes it. Existing or not
    it creates it again with the child type specified.
    */
    let child
    child = findChildReferencingThisNode(startingNode, referencedNode)
    if (child !== undefined) {
        functionLibraryNodeDeleter.deleteUIObject(child, rootNodes)
    }
    child = functionLibraryUiObjectsFromNodes.addUIObject(startingNode, childType)
    child.payload.referenceParent = referencedNode
    return child
}

function findChildIndexAtParentNode(startingNode) {
    /*
    This functioin scan all the children of a node's parent and returns the child
    index at the node property array that contains it. 
    */
    if (startingNode === undefined) { return }
    if (startingNode.payload === undefined) { return }
    if (startingNode.payload.parentNode === undefined) { return }

    let parentNode = startingNode.payload.parentNode

    let nodeDefinition = APP_SCHEMA_MAP.get(parentNode.type)
    if (nodeDefinition === undefined) { return }

    /* We scan through this parent node children */
    if (nodeDefinition.properties !== undefined) {
        for (let i = 0; i < nodeDefinition.properties.length; i++) {
            let property = nodeDefinition.properties[i]

            switch (property.type) {
                case 'node': {
                    /* We ignore these types of children. */
                }
                    break
                case 'array': {
                    let startingNodePropertyArray = parentNode[property.name]
                    if (startingNodePropertyArray !== undefined) {
                        for (let m = 0; m < startingNodePropertyArray.length; m++) {
                            let arrayItem = startingNodePropertyArray[m]

                            if (arrayItem.id === startingNode.id) {
                                return m
                            }
                        }
                    }
                    break
                }
            }
        }
    }
}

function isMissingChildrenByName(startingNode, nodeName) {
    /*
    This functioin scan all the children of a node and returns true or false
    depending if the node has a children with a certain name.  
    */
    if (startingNode === undefined) { return }

    let nodeDefinition = APP_SCHEMA_MAP.get(startingNode.type)
    if (nodeDefinition === undefined) { return }

    /* We scan through this node children */
    if (nodeDefinition.properties !== undefined) {
        for (let i = 0; i < nodeDefinition.properties.length; i++) {
            let property = nodeDefinition.properties[i]

            switch (property.type) {
                case 'node': {
                    let child = startingNode[property.name]
                    if (child.name === nodeName) {
                        return false
                    }
                }
                    break
                case 'array': {
                    let startingNodePropertyArray = startingNode[property.name]
                    if (startingNodePropertyArray !== undefined) {
                        for (let m = 0; m < startingNodePropertyArray.length; m++) {
                            let arrayItem = startingNodePropertyArray[m]
                            if (arrayItem.name === nodeName) {
                                return false
                            }
                        }
                    }
                    break
                }
            }
        }
        return true
    }
}