@prefix : <http://worldmind.ai/rivers-v4#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

# SHACL Constraints for Rivers Extended Verification

# Constraint 1: Tributaries must be River instances
:TributaryTypeConstraint
    a sh:NodeShape ;
    sh:targetSubjectsOf :hasTributary ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "Objects of :hasTributary must be instances of :River" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            
            SELECT $this ?tributary
            WHERE {
                $this :hasTributary ?tributary .
                FILTER NOT EXISTS {
                    ?tributary rdf:type :River .
                }
            }
        """ ;
    ] .

# Constraint 2: Source elevation must be positive
:SourceElevationPositiveConstraint
    a sh:NodeShape ;
    sh:targetClass :River ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "Source elevation must be positive" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            
            SELECT $this
            WHERE {
                $this :sourceElevation ?elev .
                FILTER (?elev <= 0)
            }
        """ ;
    ] .

# Constraint 3: Length must be positive
:LengthPositiveConstraint
    a sh:NodeShape ;
    sh:targetClass :River ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "River length must be positive" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            
            SELECT $this
            WHERE {
                $this :length ?len .
                FILTER (?len <= 0)
            }
        """ ;
    ] .

# Constraint 4: Discharge must be positive
:DischargePositiveConstraint
    a sh:NodeShape ;
    sh:targetClass :River ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "Discharge must be positive" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            
            SELECT $this
            WHERE {
                $this :discharge ?dis .
                FILTER (?dis <= 0)
            }
        """ ;
    ] .

# Constraint 5: Rivers with mouth elevation should have it >= 0 (sea level or above)
:MouthElevationConstraint
    a sh:NodeShape ;
    sh:targetClass :River ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "Mouth elevation should typically be >= 0" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            
            SELECT $this
            WHERE {
                $this :mouthElevation ?mouth .
                FILTER (?mouth < -100)
            }
        """ ;
    ] .

# Constraint 6: Source elevation must be > mouth elevation (rivers flow downhill)
:RiverFlowDownhillConstraint
    a sh:NodeShape ;
    sh:targetClass :River ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "Source elevation must be greater than mouth elevation" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            
            SELECT $this
            WHERE {
                $this :sourceElevation ?src .
                $this :mouthElevation ?mouth .
                FILTER (?src <= ?mouth)
            }
        """ ;
    ] .

# Constraint 7: Geographic consistency - if river traverses a state, it should be in that state's country
:GeographicConsistencyConstraint
    a sh:NodeShape ;
    sh:targetSubjectsOf :traverses ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "If traversing US state, river should be in US country" ;
        sh:select """
            PREFIX : <http://worldmind.ai/rivers-v4#>
            PREFIX dbr: <http://dbpedia.org/resource/>
            
            SELECT $this
            WHERE {
                $this :traverses ?state .
                ?state rdf:type :State .
                FILTER NOT EXISTS {
                    $this :inCountry dbr:United_States .
                }
            }
        """ ;
    ] .