`%||%` <- function(x, y) if (is.null(x)) y else x

replace_w_na <- function(x){
  lapply(x, `%||%`, y = NA)
}

subs_na <- function(x, type, prefix = NULL) {
  if (length(x) == 0) {
    return(NA)
  }

  if (type == "identical") {
    return(x)
  }

  out <- switch(type,
    row_df = as.data.frame(replace_w_na(x)),
    flat = unlist(x),
    rbind_df = do.call(rbind.data.frame, lapply(x, replace_w_na))
  )

  if (!is.null(prefix)) {
    out <- prepend(out, prefix)
  }

  list(out)
}

prepend <- function(x, prefix = "") {
  names(x) <- paste(prefix, names(x), sep = "_")
  x
}

empty_list <- function(vars) {
  setNames(as.list(rep(NA, length(vars))), vars)
}

isValidEmail <- function(x) {
  grepl("\\<[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,}\\>", as.character(x), ignore.case = TRUE)
}

append_flt <- function(x, pre = "from_publication_date", collapse = "|") {
  if (is.null(x)) {
    return(NULL)
  }

  if (length(x) > 1) x <- paste(x, collapse = collapse)
  paste0(pre, ":", x)
}

id_type <- function(identifier) {
  switch(toupper(substr(identifier, 1, 1)),
    W = "works",
    A = "authors",
    V = "venues",
    I = "institutions",
    C = "concepts",
    S = "sources",
    P = "publishers",
    `F` = "funders",
    NA
  )
}

oa_email <- function() {
  email <- Sys.getenv("openalexR.mailto")
  if (email == "") {
    email <- getOption("openalexR.mailto", default = NULL)
  }
  email
}

oa_print <- function() {
  p <- as.integer(Sys.getenv("openalexR.print"))
  if (is.na(p)){
    return(NULL)
  }
  p
}

oa_apikey <- function() {
  apikey <- Sys.getenv("openalexR.apikey")
  if (apikey == "") {
    apikey <- getOption("openalexR.apikey", default = NULL)
  }
  apikey
}

oa_progress <- function(n, text = "converting") {
  progress::progress_bar$new(
    format = paste(" ", text, "[:bar] :percent eta: :eta"),
    total = n, clear = FALSE, width = 60
  )
}

asl <- function(z) {
  if (length(z) > 1) {
    return(z)
  }

  z_low <- tolower(z)
  if (z_low == "true" || z_low == "false") {
    return(z_low)
  } else {
    return(z)
  }
}

shorten_oaid <- function(id) {
  gsub("^https://openalex.org/", "", id)
}

shorten_orcid <- function(id) {
  gsub("^https://orcid.org/", "", id)
}

rbind_oa_ls <- function(list_df) {
  all_names <- unique(unlist(lapply(list_df, names)))
  do.call(
    rbind.data.frame,
    lapply(
      list_df,
      function(x) {
        tibble::as_tibble(c(x, sapply(
          setdiff(all_names, names(x)),
          function(y) NA
        )))
      }
    )
  )
}