test_that("aemo_regions returns all five NEM regions", {
  r <- aemo_regions()
  expect_s3_class(r, "aemo_tbl")
  expect_equal(nrow(r), 5L)
  expect_setequal(r$region, c("NSW1", "QLD1", "SA1", "TAS1", "VIC1"))
})

test_that("aemo_regions distinguishes market and wall timezones", {
  r <- aemo_regions()
  # Market timezone is fixed AEST (Australia/Brisbane, no DST)
  # for every region.
  expect_true(all(r$market_timezone == "Australia/Brisbane"))
  # Wall timezones differ by region (NSW/VIC/TAS/SA observe DST).
  expect_gt(length(unique(r$wall_timezone)), 1L)
})

test_that("aemo_interconnectors returns seven interconnectors", {
  i <- aemo_interconnectors()
  expect_s3_class(i, "aemo_tbl")
  expect_equal(nrow(i), 7L)
  expect_true(all(c("interconnector_id", "from_region", "to_region") %in% names(i)))
  expect_true("V-S-N" %in% i$interconnector_id)  # Project EnergyConnect
})

test_that("aemo_units returns the current DUID registry (live)", {
  skip_on_cran()
  skip_if_offline()
  skip_if(Sys.getenv("AEMO_LIVE_TESTS") != "true",
          "Live network tests disabled by default.")

  withr::local_options(aemo.cache_dir = tempdir())
  u <- aemo_units()
  expect_s3_class(u, "aemo_tbl")
  expect_true("duid" %in% names(u))
  expect_gt(nrow(u), 0L)
})

test_that("aemo_units aborts when MMSDM is unreachable (no fallback)", {
  # aemo_units() has no fallback registry by design: a stale or invented
  # DUID table would silently mislabel historical analyses, so an
  # unreachable MMSDM archive must abort rather than return guesses.
  skip_on_cran()
  skip_if_not(
    identical(Sys.getenv("AEMO_FORCE_OFFLINE_TESTS"), "true"),
    "Offline-abort test runs only when AEMO_FORCE_OFFLINE_TESTS=true"
  )
  withr::local_options(aemo.cache_dir = tempdir(),
                       aemo.mmsdm_base = "http://127.0.0.1:1")
  expect_error(aemo_units(), "Could not retrieve DUDETAILSUMMARY")
})