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package xyz.driver.pdsuicommon.synchronization
import java.net.URL
import java.nio.ByteBuffer
import java.util.UUID
import xyz.driver.pdsuicommon.domain.{LongId, UuidId}
import xyz.driver.pdsuicommon.http.HttpFetcher
import xyz.driver.pdsuicommon.json.JsonSerializer
import xyz.driver.pdsuicommon.synchronization.domain.FakeId
import scala.collection.breakOut
import scala.concurrent.{ExecutionContext, Future}
import scala.io.Codec
package object utils {
type FakeIdMap[T] = Map[FakeId, T]
object FakeIdMap {
def empty[T]: FakeIdMap[T] = Map.empty
def create[T](xs: Seq[T])(implicit fakeIdExtractor: FakeIdGen[T]): FakeIdMap[T] = {
xs.map({ x =>
fakeIdExtractor.getFor(x) -> x
})(breakOut)
}
}
/**
* Requests domain objects from the repository using
* ids of fetched dictionary entities
*
* @param getList repository access function
* @param xs sequence of entity objects
* @param id function that extracts id from the entity
* @tparam Id Type of Id (for example [[LongId]], [[UuidId]])
* @tparam K Type parameter for Id
* @tparam D Domain object type name
* @tparam E Dictionary entity object type name
*/
def domainFromEntities[K, D, E, Id[_]](getList: Set[Id[K]] => Seq[D], xs: Seq[E])(id: E => Id[K]): Seq[D] = {
getList(xs.map(x => id(x)).toSet)
}
/** Version of [[domainFromEntities]] for LongId */
def domainFromEntitiesLong[K, D, E](getList: Set[LongId[K]] => Seq[D], xs: Seq[E])(id: E => Long): Seq[D] = {
domainFromEntities(getList, xs)(e => LongId(id(e)))
}
/** Version of [[domainFromEntities]] for UuidId */
def domainFromEntitiesUUID[K, D, E](getList: Set[UuidId[K]] => Seq[D], xs: Seq[E])(id: E => UUID): Seq[D] = {
domainFromEntities(getList, xs)(e => UuidId(id(e)))
}
def fetch[T](httpFetcher: HttpFetcher, url: URL)(implicit m: Manifest[T], ec: ExecutionContext): Future[T] = {
httpFetcher(url).map { rawContent =>
val content = Codec.UTF8.decoder.decode(ByteBuffer.wrap(rawContent)).toString
JsonSerializer.deserialize[T](content)
}
}
}
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