#' Updater function for elasticizer: Conduct actor searches
#'
#' Updater function for elasticizer: Conduct actor searches
#' @param out Does not need to be defined explicitly! (is already parsed in the elasticizer function)
#' @param localhost Defaults to false. When true, connect to a local Elasticsearch instance on the default port (9200)
#' @param ids List of actor ids
#' @param prefix Regex containing prefixes that should be excluded from hits
#' @param postfix Regex containing postfixes that should be excluded from hits
#' @param identifier String used to mark highlights. Should be a lowercase string
#' @param udmodel The udpipe model used for parsing every hit
#' @param ver Short string (preferably a single word/sequence) indicating the version of the updated document (i.e. for a udpipe update this string might be 'udV2')
#' @param es_super Password for write access to ElasticSearch
#' @return As this is a nested function used within elasticizer, there is no return output
#' @export
#' @examples
#' actorizer(out, localhost = F, ids, type, prefix, postfix, identifier, udmodel, es_super)
actorizer <- function(out, localhost = F, ids, type, prefix, postfix, identifier, udmodel, es_super, ver) {
  sentencizer <- function(row, out, udmodel, ids, prefix, postfix, identifier) {
    ### If no pre or postfixes, match *not nothing* i.e. anything
    if (is.na(prefix) || prefix == '') {
      prefix = '$^'
    }
    if (is.na(postfix) || postfix == '') {
      postfix = '$^'
    }
    ### Also needs fix for empty strings (non-NA)
    err <- F
    doc <- out[row,]
    ud_org <- doc$`_source.ud`[[1]] %>%
      select(-one_of('exists')) %>% # Removing ud.exists variable
      unnest()
    ud <- as.data.frame(udpipe_annotate(udmodel, x = doc$merged, parser = "none", doc_id = doc$`_id`))
    ud[,'actor'] <- NA
    markers <- which(str_detect(ud$lemma, coll("|||")))
    ud[markers+1,'actor'] <- T
    ud <- ud[-markers,]
    ## The exception below is only valid for the UK, where the original UDPipe output misses a dot at the end of the article, but the actor output does not
    ## (UK output is older than actor output, should be updated)
    if (length(ud_org$sentence_id) == length(ud$sentence_id)-1) {
      ud <- ud[-length(ud$sentence_id),]
    }
    if (length(ud_org$sentence_id) == length(ud$sentence_id)) {
      ud <- bind_cols(ud_org, sentence = ud$sentence, token = ud$token, doc_id = ud$doc_id, actor = ud$actor)
    } else {
      err = T
      print(paste0('ud_org and ud_actor not the same length for id ', doc$`_id`))
      print(length(ud_org$sentence_id))
      print(length(ud$sentence_id))
    }
    sentence_count <- length(unique(ud$sentence_id))
    ud <- ud %>%
      filter(T, actor) %>% # Only select tokens containing actor
      filter(!str_detect(sentence, postfix)) %>% # Filter out sentences with matching postfixes (false positives)
      filter(!str_detect(sentence, prefix)) %>% # Filter out sentences with matching prefixes (false positives)
      group_by(doc_id) %>%
      summarise(
        sentence_id = list(list(as.integer(sentence_id))),
        token_id = list(list(as.integer(token_id))),
        text = list(list(unique(as.character(sentence))))
      )
    occurences <- length(unique(ud$sentence_id[[1]][[1]])) # Number of sentences in which actor occurs
    prominence <- occurences/sentence_count # Relative prominence of actor in article (number of occurences/total # sentences)
    rel_first <- 1-(ud$sentence_id[[1]][[1]][1]/sentence_count) # Relative position of first occurence at sentence level

    return(data.frame(ud,occ = occurences,prom = prominence,rel_first = rel_first, ids = I(list(list(ids))), err = err))
  }
  out <- mamlr:::out_parser(out, field = 'highlight', clean = F)
  ids <- fromJSON(ids)
  updates <- bind_rows(mclapply(seq(1,length(out[[1]]),1), sentencizer, out = out, ids = ids, postfix = postfix, prefix=prefix, identifier=identifier, udmodel = udmodel, mc.cores = detectCores()))
  bulk <- apply(updates, 1, bulk_writer, varname ='actorsDetail', type = 'add', ver = ver)
  bulk <- c(bulk,apply(updates[c(1,8)], 1, bulk_writer, varname='actors', type = 'add', ver = ver))
  return(elastic_update(bulk, es_super = es_super, localhost = localhost))
}