Ferme/frontend/composables/useAddressSync.ts

import type { Ref } from 'vue'
import type { AddressData } from '~/services/dto/address-data'

interface AddressOwner {
    id: number
    addresses?: AddressData[]
}

export const useAddressSync = (
    form: { addressId: string },
    ownerId: Ref<string>,
    owners: Ref<AddressOwner[]>
) => {
    const ownerAddresses = computed<AddressData[]>(() => {
        const id = Number(ownerId.value)
        if (!Number.isFinite(id)) return []
        return owners.value.find((owner) => owner.id === id)?.addresses ?? []
    })

    const addressOptions = computed(() =>
        ownerAddresses.value.map((address) => ({
            value: String(address.id),
            label: address.fullAddress
        }))
    )

    watch(
        () => [ownerId.value, form.addressId, owners.value],
        () => {
            if (!ownerId.value) {
                form.addressId = ''
                return
            }
            if (!form.addressId && ownerAddresses.value.length === 1) {
                form.addressId = String(ownerAddresses.value[0].id)
                return
            }
            if (!form.addressId) return
            const matches = ownerAddresses.value.some(
                (address) => String(address.id) === form.addressId
            )
            if (!matches) {
                if (ownerAddresses.value.length === 1) {
                    form.addressId = String(ownerAddresses.value[0].id)
                } else {
                    form.addressId = ''
                }
            }
        },
        { immediate: true }
    )

    return { ownerAddresses, addressOptions }
}