#' Creating data frame from raw log files.
#'
#' Creates a data frame or CSV file from raw log files from a
#' Multi-Touch-Table at the IWM.
#'
#' @param folders A character vector of folder names that contain the raw
#' log files from the Multi-Touch-Table at the IWM.
#' @param path A path to the folder that contains the folders specified in
#' first argument. Needs to end in a "/"!
# TODO: How to catch this?
#' @param file Name of the file where parsed log files should be saved.
#' Default is "rawdata_logfiles.csv".
#' @param save Logical. If data frame should be returned by the function or
#' saved. Default is TRUE.
#' @return A data frame or NULL.
#' @export
#' @examples
#' # parse_logfiles("all", path = "../data/haum/haum_logs_2016-2023/")
parse_logfiles <- function(folders, path, file = "rawdata_logfiles.csv",
                           save = FALSE) {

  pbapply::pboptions(style = 3, char = "=")

  # TODO: This is not very intutitive
  fnames <- dir(paste0(path, folders), pattern = "*.log", full.names = TRUE)

  cat(paste0("\n########## Reading ", length(fnames), " log files... ##########"), "\n\n")
  suppressWarnings(
    logs <- pbapply::pblapply(fnames, readLines)
  )
  nlog <- sapply(logs, length)
  dat <- data.frame(fileId = rep(leftpad_fnames(fnames), nlog),
                    logs = unlist(logs))
  dat$folder <- rep(sapply(strsplit(fnames, "/"),
                       function(x) utils::tail(x, 2)[1]), nlog)

  # Remove corrupt lines
  d1 <- nrow(dat)
  dat <- subset(dat, dat$logs != "")
  d2 <- nrow(dat)

  if(d1 > d2) {
    warning(paste0(d1-d2, " corrupt lines have been found and removed from the data set\n"))
  }

  # Extract relevant infos
  cat("\n########## Parsing individual data parts... ##########", "\n")
  cat("\n Extract dates...", "\n\n")
  date <- pbapply::pbsapply(dat$logs, gsub,
                 pattern = "^\\[(.*)\\], \\[.*$",
                 replacement = "\\1",
                 USE.NAMES = FALSE)

  cat("\n Extract timestamps...", "\n\n")
  timestamp <- pbapply::pbsapply(dat$logs, gsub,
                      pattern = "^\\[.*\\], \\[(.*)\\].*$",
                      replacement = "\\1",
                      USE.NAMES = FALSE)

  cat("\n Extract events...", "\n\n")
  action <- pbapply::pbsapply(dat$logs, gsub,
                   pattern = "^.*EyeVisit, (.*):*.*$",
                   replacement = "\\1",
                   USE.NAMES = FALSE)

  cat("\n Parse separate events...", "\n\n")
  events <- pbapply::pbsapply(strsplit(action, ":"), function(x) x[1])

  cat("\n Extract topics...", "\n\n")
  topics <- pbapply::pbsapply(strsplit(action, ":"), function(x) x[2])

  cat("\n Extract move information...", "\n\n")
  suppressWarnings(
    moves <- pbapply::pbapply(do.call(rbind,
                     strsplit(sapply(strsplit(action, ":"),
                                     function(x) x[3]), ",")), 2,
                   as.numeric)
  )
  # ATTENTION: as.numeric() forces NAs for "OpenCard" and "CloseCard"

  cat("\n Extract popups...", "\n\n")
  card_action <- trimws(pbapply::pbsapply(strsplit(action, ":"),
                               function(x) x[3])[grep("Artwork", events)])

  card <- as.numeric(pbapply::pbsapply(strsplit(action, ":"),
                                       function(x) x[4]))

  events[grep("Artwork", events)] <- paste("Artwork", card_action, sep = "/")

  cat("\n Transform timestamps to ms...", "\n\n")
  ts_elements <- strsplit(timestamp, ":")
  time_ms <- as.numeric(sapply(ts_elements, function(x) x[4])) +
             as.numeric(sapply(ts_elements, function(x) x[3])) * 1000 +
             as.numeric(sapply(ts_elements, function(x) x[2])) * 1000 * 60

  dat$date        <- lubridate::parse_date_time(date, "bdyHMSOp")
  dat$timeMs      <- time_ms
  dat$event       <- events
  dat$item        <- trimws(sapply(strsplit(topics, "/"), function(x) x[1]))
  dat$popup       <- sapply(strsplit(topics, "/"), function(x) x[2])
  dat$topic       <- card
  dat$x           <- moves[,1]
  dat$y           <- moves[,2]
  dat$scale       <- moves[,3]
  dat$rotation    <- moves[,4]
  dat$logs        <- NULL

  dat <- dat[order(dat$fileId, dat$date, dat$timeMs), ]

  # Export data
  if (save) {
    cat("Saving data...", "\n\n")
    utils::write.table(dat, file = file, sep = ";", row.names = FALSE)
    cat(paste0("INFORMATION: Data file ", file, " has been written to ", getwd(), "\n\n"))
  } else {
    return(dat)
  }
}

#' Left padding file names of raw log files from Multi-Touch-Table at the
#' IWM.
#'
#' File names need to be left padded since otherwise the sorting of the
#' timestamps will be off and one will get negative durations later on
#' since the wrong events get closed.
#'
#' @param fnames File name in the form of `yyyy_mm_dd-hh_mm_ss`, possible
#' with missing zero left padding.
#' @return Left padded file names.
#' @examples
#' # folders <- "all"
#' # dirpaths <- paste0("../data/haum_logs_2016-2023/", folders)
#' # fnames <- dir(dirpaths, pattern = "*.log", full.names = TRUE)
#' # leftpad_fnames(fnames)
leftpad_fnames <- function(fnames) {

  z <- sapply(fnames, function(x) utils::tail(strsplit(x, "/")[[1]], 1),
              USE.NAMES = FALSE)
  ys <- strsplit(z, "_")

  res <- NULL

  for (y in ys) {
    y2 <- unlist(strsplit(y[3], "-"))
    e1 <- y[1]
    e2 <- sprintf("%02d", as.numeric(y[2]))
    e3 <- sprintf("%02d", as.numeric(y2[1]))
    e4 <- sprintf("%02d", as.numeric(y2[2]))
    e5 <- sprintf("%02d", as.numeric(y[4]))
    e6 <- sprintf("%02d", as.numeric(gsub(".log", "", y[5])))

    res <- c(res,
             paste0(e1, "_", e2, "_", e3, "-", e4, "_", e5, "_", e6, ".log"))
  }
  res
}