test_that('geohash decoder works', {
  borobudur = 'qqwkex'
  akarenga = 'xpkjd5'
  kalakuta = 's14mh7y'
  neum = 'srss0'

  # test defaults on scalar input
  expect_identical(
    gh_decode(borobudur),
    list(latitude = -7.60528564453125, longitude = 110.1983642578125),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(c(borobudur, akarenga)),
    list(latitude = c(-7.60528564453125, 41.7672729492188), longitude = c(110.198364257812, 140.718383789062)),
    tolerance = 1e-8
  )
  ## precision can vary
  expect_identical(
    gh_decode(c(borobudur, neum)),
    list(latitude = c(-7.60528564453125, 42.91259765625), longitude = c(110.198364257812, 17.60009765625)),
    tolerance = 1e-8
  )

  # input is factor, #17
  x = gl(4L, 20L, labels = c(borobudur, akarenga, kalakuta, neum))
  expect_identical(gh_decode(x), gh_decode(as.character(x)))

  # option: include_delta
  expect_identical(
    gh_decode(borobudur, include_delta = TRUE),
    list(
      latitude = -7.60528564453125,
      longitude = 110.198364257812,
      delta_latitude = 0.00274658203125,
      delta_longitude = 0.0054931640625
    ),
    tolerance = 1e-8
  )
  ## different precision, different delta
  expect_identical(
    gh_decode(c(borobudur, neum), include_delta = TRUE),
    list(
      latitude = c(-7.60528564453125, 42.91259765625),
      longitude = c(110.198364257812, 17.60009765625),
      delta_latitude = c(0.00274658203125, 0.02197265625),
      delta_longitude = c(0.0054931640625, 0.02197265625)
    ),
    tolerance = 1e-8
  )

  # option: coord_loc
  expect_identical(
    gh_decode(borobudur, coord_loc = 'se'),
    list(latitude = -7.6080322265625, longitude = 110.203857421875),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'southeast'),
    list(latitude = -7.6080322265625, longitude = 110.203857421875),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 's'),
    list(latitude = -7.6080322265625, longitude = 110.198364257812),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'south'),
    list(latitude = -7.6080322265625, longitude = 110.198364257812),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'sw'),
    list(latitude = -7.6080322265625, longitude = 110.19287109375),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'southwest'),
    list(latitude = -7.6080322265625, longitude = 110.19287109375),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'w'),
    list(latitude = -7.60528564453125, longitude = 110.19287109375),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'west'),
    list(latitude = -7.60528564453125, longitude = 110.19287109375),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'nw'),
    list(latitude = -7.6025390625, longitude = 110.19287109375),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'northwest'),
    list(latitude = -7.6025390625, longitude = 110.19287109375),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'n'),
    list(latitude = -7.6025390625, longitude = 110.198364257812),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'north'),
    list(latitude = -7.6025390625, longitude = 110.198364257812),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'ne'),
    list(latitude = -7.6025390625, longitude = 110.203857421875),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'northeast'),
    list(latitude = -7.6025390625, longitude = 110.203857421875),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'e'),
    list(latitude = -7.60528564453125, longitude = 110.203857421875),
    tolerance = 1e-8
  )
  expect_identical(
    gh_decode(borobudur, coord_loc = 'east'),
    list(latitude = -7.60528564453125, longitude = 110.203857421875),
    tolerance = 1e-8
  )
  # be sure adjacent geohashes interlock
  expect_identical(
    lapply(c('nw', 'n', 'ne'), function(l) gh_decode('m', coord_loc = l)),
    lapply(c('sw', 's', 'se'), function(l) gh_decode('t', coord_loc = l))
  )

  expect_error(
    gh_decode(c(borobudur, neum), coord_loc = c('n', 's')),
    'Please provide only one value',
    fixed = TRUE
  )
  expect_error(
    gh_decode(akarenga, coord_loc = 'yo'),
    'Unrecognized coordinate location',
    fixed = TRUE
  )

  # invalid geohash characters:
  expect_error(
    gh_decode('a'),
    "Invalid geohash; check 'a' at index 1.",
    fixed = TRUE
  )
  expect_error(
    gh_decode(c('b', 'a')),
    "Invalid geohash; check 'a' at index 2.",
    fixed = TRUE
  )

  # missing input
  expect_identical(
    gh_decode(c(neum, NA_character_)),
    list(latitude = c(42.91259765625, NA), longitude = c(17.60009765625, NA))
  )
  expect_identical(
    gh_decode(c(neum, NA_character_), include_delta = TRUE),
    list(
      latitude = c(42.91259765625, NA),
      longitude = c(17.60009765625, NA),
      delta_latitude = c(0.02197265625, NA),
      delta_longitude = c(0.02197265625, NA)
    )
  )

  # stress testing
  ## empty input
  expect_identical(
    gh_decode(character(0L)),
    list(latitude = numeric(0L), longitude = numeric(0L))
  )
  ## !nzchar input
  expect_identical(
    gh_decode(''),
    list(latitude = NA_real_, longitude = NA_real_)
  )
  ## long input [intr_length > 8 in geohash_decode_impl]
  expect_identical(
    gh_decode(strrep('1', 26L)),
    list(latitude = -84.1935483870968, longitude = -133.548387117729),
    tolerance = 1e-8
  )

  ## non-ASCII input #19
  ##   useBytes needed a bit strangely -- that the error returns with _any_
  ##     non-ASCII character throws off the string matching even when only
  ##     attempting to match ASCII-only characters.
  expect_error(
    gh_decode(rawToChar(as.raw(128L))),
    'Non-ASCII character at index 1',
    fixed = TRUE, useBytes = TRUE
  )
})