BlackDice/b3-chief

import { oneLine } from 'common-tags'
import { BEHAVIOR_TYPE } from '../const'

const initialChildIndex = 0

const behavior = {
    name: 'MemSequence',
    type: BEHAVIOR_TYPE.COMPOSITE,
    description: oneLine`
        MemSequence is similar to Sequence node, but when a child returns a
        RUNNING state, its index is recorded and in the next tick the
        MemSequence call the child recorded directly, without calling previous
        children again.
    `,
}

const compilation = {
    onOpen({ memory }) {
        memory.set('runningChild', initialChildIndex)
    },
    tick({ status, memory }, { children }) {
        const childrenCount = children.length

        let childIndex = memory.get('runningChild') || initialChildIndex

        while (childIndex < childrenCount) {
            const child = children[childIndex]
            const childStatus = child()

            if (childStatus !== status.SUCCESS) {
                if (childStatus === status.RUNNING) {
                    memory.set('runningChild', childIndex)
                }
                return childStatus
            }

            childIndex += 1 // eslint-disable-line no-magic-numbers
        }

        return status.SUCCESS
    },
}

export default { behavior, compilation }