library("SPARQL")
library("stringi")

### Konfiguration einbinden
source("config/config.R")

### Gets the bibliographicCitations which are currently in the db ##################

read_current_geoera_lit_db <- function() {
  
## http verwenden - https funktioniert nicht ##
endpoint = "http://resource.geolba.ac.at/PoolParty/sparql/geoera"
  
query <- 
    "PREFIX skos:<http://www.w3.org/2004/02/skos/core#>
PREFIX dcterms:<http://purl.org/dc/terms/>
select *
where {
?uri a skos:Concept; skos:prefLabel ?L; dcterms:bibliographicCitation ?citation . 
filter(regex(str(?uri),\"/ref/\")) filter(lang(?L)=\"en\")
optional {?uri dcterms:source ?downloadLink}
}
order by ?L
"


qd <- SPARQL(endpoint, query)
inDB <- qd$results

for (j in 1:length (inDB[1, ])) {
  
  for (i in 1:length(inDB[, j])) {
    Encoding(inDB[i, j]) <-  "UTF-8"
  }
}


pfad <- paste(PFAD_DB_OUT, "inDB-", format(Sys.Date(), "%Y_%m_%d"), ".xlsx", sep="")

write_xlsx(inDB, pfad)

}


get_current_geoera_lit_db <- function() {
  
  pfad <- paste(PFAD_DB_OUT, "inDB-", format(Sys.Date(), "%Y_%m_%d"), ".xlsx", sep="")
  
  if (file.exists(pfad)) {
    inDB <- read_excel(pfad)
    return(inDB)
  }
  
  else {
    read_current_geoera_lit_db()
    
    get_current_geoera_lit_db()
  }
  
}