# Process command arguments
test_args <- commandArgs(TRUE)
torture_mem <- any(stringr::str_detect(test_args, "^--use-gctorture"))

if (length(tags_to_run <- test_args[stringr::str_detect(test_args, "^--run-tests")])) {
  tags_to_run <- unlist(str_split(
    str_split(tags_to_run, "=")[[1]][2],
    ","
  ))
}

if (torture_mem) {
  gctorture(TRUE)
}
using_windows <- Sys.info()["sysname"] == "Windows"

# Ensure tikzDevice options have been set to their default values.
setTikzDefaults(overwrite = TRUE)
options(tikzMetricsDictionary = NULL)

expand_test_path <- function(path) {
  normalizePath(path, mustWork = FALSE)
}

# Set up directories for test output.
test_output_dir <- expand_test_path(file.path(getwd(), "test_output"))
if (!file.exists(test_output_dir)) dir.create(test_output_dir)
test_work_dir <- expand_test_path(file.path(getwd(), "test_work"))
if (!file.exists(test_work_dir)) dir.create(test_work_dir)

test_standard_dir <- normalizePath("standard_graphs")

oldwarn <- options(warn = 1)

# Locate required external programs
gs_cmd <- Sys.which(ifelse(using_windows, "gswin32c", "gs"))
if (nchar(gs_cmd) == 0) {
  warning("Ghostscript not found.")
  gs_cmd <- NULL
} else {
  gs_cmd <- normalizePath(gs_cmd)
}

compare_cmd <- Sys.which("compare")
if (nchar(compare_cmd) == 0 || is.null(gs_cmd)) {
  warning("compare not found.")
  compare_cmd <- NULL
} else {
  compare_cmd <- normalizePath(compare_cmd)
}

convert_cmd <- normalizePath(
  ifelse(using_windows,
    system("bash -c 'which convert'", intern = TRUE, ignore.stderr = TRUE),
    Sys.which("convert")
  )
)

if (nchar(convert_cmd) == 0) {
  convert_cmd <- NULL
  warning("convert not found.")
} else if (is.null(gs_cmd)) {
  convert_cmd <- NULL
  warning("Cannot use convert because Ghostscript is missing.")
} else {
  convert_cmd <- normalizePath(convert_cmd)
}

cat("Ghostscript: ", gs_cmd, "\n")
cat("compare: ", compare_cmd, "\n")
cat("convert: ", convert_cmd, "\n")

options(oldwarn)