sub:assertion {
  sub:get-3pff-event-participation-stats dct:description "Returns all 3PFF events with participant counts per role (Participants, Facilitators, Trainers, etc.)." ;
    dct:license <http://www.apache.org/licenses/LICENSE-2.0> ;
    a <https://w3id.org/kpxl/grlc/grlc-query> ;
    rdfs:label "Get 3PFF event participation stats" ;
    <https://w3id.org/kpxl/grlc/endpoint> <https://w3id.org/np/l/nanopub-query-1.1/repo/full> ;
    <https://w3id.org/kpxl/grlc/sparql> """prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix np: <http://www.nanopub.org/nschema#>
prefix npa: <http://purl.org/nanopub/admin/>
prefix npx: <http://purl.org/nanopub/x/>
prefix dct: <http://purl.org/dc/terms/>
prefix tpff: <https://w3id.org/fair/3pff/>
prefix schema: <http://schema.org/>

select ?event ?event_label (sample(?ev_name) as ?event_name) (sample(?ev_date) as ?event_date) (sum(if(?role = tpff:participatedAsParticipantIn, 1, 0)) as ?Participants) (sum(if(?role = tpff:participatedAsFacilitatorIn, 1, 0)) as ?Facilitators) (sum(if(?role = tpff:participatedAsTrainerIn, 1, 0)) as ?Trainers) (sum(if(?role = tpff:participatedAsFacilitatorAssistantIn, 1, 0)) as ?Facilitator_Assistants) (sum(if(?role = tpff:participatedAsTrainerAssistantIn, 1, 0)) as ?Trainer_Assistants) (sum(if(?role = tpff:participatedAsImplementerIn, 1, 0)) as ?Implementers) (sum(if(?role = tpff:participatedAsImplementerAspirantIn, 1, 0)) as ?Implementer_Aspirants) where {
  {
    select distinct ?event ?role ?user where {
      values ?role {
        tpff:participatedAsParticipantIn
        tpff:participatedAsFacilitatorIn
        tpff:participatedAsTrainerIn
        tpff:participatedAsFacilitatorAssistantIn
        tpff:participatedAsTrainerAssistantIn
        tpff:participatedAsImplementerIn
        tpff:participatedAsImplementerAspirantIn
      }
      graph npa:graph {
        ?np npx:hasNanopubType ?role .
        ?np npa:hasValidSignatureForPublicKeyHash ?pk .
        filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKeyHash ?pk . }
        ?np np:hasAssertion ?a .
      }
      graph ?a {
        ?user ?role ?event .
      }
    }
  }
  graph npa:graph {
    ?enp npx:introduces ?event .
    ?enp npa:hasValidSignatureForPublicKeyHash ?epk .
    filter not exists { ?enpx npx:invalidates ?enp ; npa:hasValidSignatureForPublicKeyHash ?epk . }
    ?enp np:hasAssertion ?ea .
  }
  graph ?ea {
    ?event a tpff:3PFF-event .
    ?event rdfs:label ?ename .
    optional { ?event dct:date ?dateDct . }
    optional { ?event schema:startDate ?dateSchema . }
  }
  bind(replace(str(?event), \"^.*/\", \"\") as ?event_label)
  bind(coalesce(?dateDct, strBefore(str(?dateSchema), \"T\")) as ?ev_date)
  bind(replace(?ename, \"^[^|]*\\\\| ?\", \"\") as ?ev_name)
}
group by ?event ?event_label
order by desc(sample(?ev_date))""" .
}