import {getPath} from '@/lib/resourcePath'
import type {CloudResource} from '@/types/resource'
import type {ServiceSchema} from '@/types/schema'

/**
 * "This also deletes 2 users and 1 app client." for the delete confirmation,
 * summed over the selected resources. A count is a number at the path, or the
 * length of a list there; anything else, and zero counts, are left out.
 */
export function describeDeleteImpact(impact: ServiceSchema['deleteImpact'], resources: CloudResource[]): string | null {
    if (!impact?.length) return null

    const parts = impact.flatMap(({path, singular, plural}) => {
        const total = resources.reduce((sum, resource) => {
            const value = getPath(resource, path)
            if (Array.isArray(value)) return sum + value.length
            return typeof value === 'number' && Number.isFinite(value) ? sum + value : sum
        }, 0)
        return total > 0 ? [`${total} ${total === 1 ? singular : plural}`] : []
    })
    if (parts.length === 0) return null

    const list = parts.length === 1 ? parts[0] : `${parts.slice(0, -1).join(', ')} and ${parts[parts.length - 1]}`
    return `This also deletes ${list}.`
}