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package xyz.driver.server.parsers
import xyz.driver.pdsuicommon.db.Pagination
import xyz.driver.server.parsers.errors.ParseQueryArgException
import play.api.data.validation._
import play.api.routing.sird.QueryString
import xyz.driver.pdsuicommon.validation.AdditionalConstraints
import scala.util.Try
object PaginationParser {
private val oneQueryArgConstraint: Constraint[Seq[String]] = {
Constraint("query.oneArg") {
case Nil => Valid
case x +: Nil => Valid
case xs =>
Invalid(new ValidationError(Seq(s"must be one argument, but there are multiple: '${xs.mkString(", ")}'")))
}
}
private val pageSizeCheckConstraint: Constraint[Seq[String]] = {
Constraint("pagination.pageSize") { args =>
oneQueryArgConstraint(args) match {
case x: Invalid => x
case Valid => AdditionalConstraints.positivePrintedNumber(args.head)
}
}
}
private val pageNumberCheckConstraint: Constraint[Seq[String]] = {
Constraint("pagination.pageNumber") { args =>
oneQueryArgConstraint(args) match {
case x: Invalid => x
case Valid => AdditionalConstraints.positivePrintedNumber(args.head)
}
}
}
def parse(queryString: QueryString): Try[Pagination] = Try {
val rawPageSizes = queryString.getOrElse("pageSize", Seq(Pagination.Default.pageSize.toString))
val rawPageNumbers = queryString.getOrElse("pageNumber", Seq(Pagination.Default.pageNumber.toString))
val validation = Seq(
"pageSize" -> pageSizeCheckConstraint(rawPageSizes),
"pageNumber" -> pageNumberCheckConstraint(rawPageNumbers)
)
val validationErrors = validation.collect {
case (fieldName, e: Invalid) => (fieldName, e.errors.mkString("; "))
}
if (validationErrors.isEmpty) {
Pagination(Integer.parseInt(rawPageSizes.head), Integer.parseInt(rawPageNumbers.head))
} else {
throw new ParseQueryArgException(validationErrors: _*)
}
}
}
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