test_that('gh_to_sp works', {
  skip_if_not_installed('sp')
  mauritius = c('mk2u', 'mk2e', 'mk2g', 'mk35', 'mk3h', 'mk3j', 'mk2v', 'mk2t', 'mk2s')

  ghSP = gh_to_sp(mauritius)

  expect_s4_class(ghSP, 'SpatialPolygons')
  expect_length(ghSP, 9L)
  expect_identical(vapply(ghSP@polygons, slot, 'ID', FUN.VALUE = character(1L)), mauritius)
  expect_identical(
    ghSP['mk2u', ]@polygons[[1L]]@Polygons[[1L]]@coords,
    matrix(
      c(
        57.3046875, -20.39062500,
        57.3046875, -20.21484375,
        57.6562500, -20.21484375,
        57.6562500, -20.39062500,
        57.3046875, -20.39062500
      ),
      byrow = TRUE, ncol = 2L
    )
  )
  wgs = sp::CRS('+proj=longlat +datum=WGS84', doCheckCRSArgs = FALSE)
  expect_identical(ghSP@proj4string, wgs)

  # duplicate inputs dropped
  expect_warning(
    expect_identical(gh_to_sp(rep(mauritius, 2L)), ghSP),
    'duplicate input geohashes',
    fixed = TRUE
  )
})

test_that('gh_to_spdf.default works', {
  skip_if_not_installed('sp')
  urumqi = c('tzy3', 'tzy0', 'tzy2', 'tzy8', 'tzy9', 'tzyd', 'tzy6', 'tzy4', 'tzy1')

  ghSPDF = gh_to_spdf(urumqi)

  expect_s4_class(ghSPDF, 'SpatialPolygonsDataFrame')
  expect_length(ghSPDF, 9L)
  expect_identical(vapply(ghSPDF@polygons, slot, 'ID', FUN.VALUE = character(1L)), urumqi)
  expect_identical(
    ghSPDF['tzy2', ]@polygons[[1L]]@Polygons[[1L]]@coords,
    matrix(
      c(
        87.5390625, 43.59375000,
        87.5390625, 43.76953125,
        87.8906250, 43.76953125,
        87.8906250, 43.59375000,
        87.5390625, 43.59375000
      ),
      byrow = TRUE, ncol = 2L
    )
  )
  wgs = sp::CRS('+proj=longlat +datum=WGS84', doCheckCRSArgs = FALSE)
  expect_identical(ghSPDF@proj4string, wgs)

  DF = data.frame(ID = 1:9, row.names = urumqi)
  expect_identical(ghSPDF@data, DF)
  # check also duplicated input (#8)
  expect_warning(
    expect_identical(gh_to_spdf(rep(urumqi, 2L))@data, DF),
    'Detected 9 duplicate input geohashes; removing',
    fixed = TRUE
  )
})

test_that('gh_to_spdf.data.frame works', {
  skip_if_not_installed('sp')
  urumqi = c('tzy3', 'tzy0', 'tzy2', 'tzy8', 'tzy9', 'tzyd', 'tzy6', 'tzy4', 'tzy1')
  DF = data.frame(
    gh = urumqi,
    V = c(-1.08, 0.03, -0.68, -2.59, -0.02, 0.72, 0.68, 1.14, 0.47)
  )
  ghSPDF = gh_to_spdf(DF)

  expect_s4_class(ghSPDF, 'SpatialPolygonsDataFrame')
  expect_length(ghSPDF, 9L)
  expect_identical(vapply(ghSPDF@polygons, slot, 'ID', FUN.VALUE = character(1L)), urumqi)
  expect_identical(
    ghSPDF['tzy2', ]@polygons[[1L]]@Polygons[[1L]]@coords,
    matrix(
      c(
        87.5390625, 43.59375000,
        87.5390625, 43.76953125,
        87.8906250, 43.76953125,
        87.8906250, 43.59375000,
        87.5390625, 43.59375000
      ),
      byrow = TRUE, ncol = 2L
    )
  )
  wgs = sp::CRS('+proj=longlat +datum=WGS84', doCheckCRSArgs = FALSE)
  expect_identical(ghSPDF@proj4string, wgs)
  expect_identical(ghSPDF@data, DF)

  # duplicated inputs (#8)
  expect_warning(
    expect_identical(gh_to_spdf(rbind(DF, DF))@data, DF),
    'Detected 9 duplicate input geohashes; removing',
    fixed = TRUE
  )

  # different gh_col
  names(DF) = c('geohash', 'V')
  ghSPDF = gh_to_spdf(DF, gh_col = 'geohash')
  expect_s4_class(ghSPDF, 'SpatialPolygonsDataFrame')
  expect_length(ghSPDF, 9L)

  # missing gh_col
  expect_error(gh_to_spdf(DF), 'Searched for geohashes', fixed = TRUE)
})

test_that('gh_to_sf works', {
  skip_if_not_installed('sf')
  baku = c('tp5my', 'tp5mt', 'tp5mw', 'tp5mx', 'tp5mz', 'tp5qp', 'tp5qn', 'tp5qj', 'tp5mv')

  ghSF = gh_to_sf(baku)

  expect_s3_class(ghSF, 'sf')
  expect_identical(ghSF$ID, 1:9)
  expect_length(ghSF$geometry, 9L)

  expect_s3_class(ghSF$geometry[1L], 'sfc')
  expect_s3_class(ghSF$geometry[1L][[1L]], 'sfg')
  expect_identical(
    ghSF$geometry[1L][[1L]][[1L]],
    matrix(
      c(
        49.8339843750, 40.3857421875,
        49.8339843750, 40.4296875000,
        49.8779296875, 40.4296875000,
        49.8779296875, 40.3857421875,
        49.8339843750, 40.3857421875
      ),
      byrow = TRUE, ncol = 2L
    )
  )
})

test_that('gh_covering works', {
  skip_if_not_installed('sp')
  banjarmasin = sp::SpatialPoints(cbind(
    c(114.605, 114.5716, 114.627, 114.5922, 114.6321,
      114.5804, 114.6046, 114.6028, 114.6232, 114.5792),
    c(-3.3346, -3.2746, -3.2948, -3.3424, -3.3523,
      -3.3304, -3.3005, -3.3141, -3.326, -3.3552)
  ))

  # core
  banjarmasin_cover = gh_covering(banjarmasin)
  wgs = sp::CRS('+proj=longlat +datum=WGS84', doCheckCRSArgs = FALSE)
  sp::proj4string(banjarmasin) = wgs
  # use gUnaryUnion to overcome rgeos bug as reported 2019-08-16
  expect_false(anyNA(sp::over(banjarmasin, banjarmasin_cover)))
  expect_identical(
    sort(rownames(banjarmasin_cover@data))[1:10],
    c('qx3kzj', 'qx3kzm', 'qx3kzn', 'qx3kzp', 'qx3kzq', 'qx3kzr', 'qx3kzt', 'qx3kzv', 'qx3kzw', 'qx3kzx')
  )
  expect_length(banjarmasin_cover, 112L)

  # arguments
  expect_length(gh_covering(banjarmasin, 5L), 9L)
  banjarmasin_tight = gh_covering(banjarmasin, minimal = TRUE)
  expect_identical(
    sort(rownames(banjarmasin_tight@data))[1:10],
    c('qx3kzm', 'qx3kzx', 'qx3mp3', 'qx3mpb', 'qx3mpu', 'qx3mpz', 'qx3mr5', 'qx3sbt', 'qx3t06', 'qx3t22')
  )
  expect_length(banjarmasin_tight, 10L)
  # #13 -- proj4string<- doesn't mutate object, but proj4string() <- does?
  sp::proj4string(banjarmasin) = NA_character_
  banjarmasin_cover = gh_covering(banjarmasin, minimal = TRUE)
  sp::proj4string(banjarmasin_cover) = wgs
  expect_equivalent(banjarmasin_cover, banjarmasin_tight)

  # works for SpatialPointsDataFrame when minimal=TRUE, #30
  banjarmasinDF = sp::SpatialPointsDataFrame(
    banjarmasin, data = data.frame(ID = letters[seq_along(banjarmasin)])
  )
  expect_identical(gh_covering(banjarmasinDF, minimal=TRUE)@polygons, banjarmasin_tight@polygons)

  # errors
  expect_error(gh_covering(4L), 'Object to cover must be Spatial', fixed = TRUE)
})

test_that('gh_covering_sf works', {
  skip_if_not_installed('sp')
  skip_if_not_installed('sf')
  banjarmasin = sf::st_as_sf(sp::SpatialPoints(cbind(
    c(114.6050, 114.5716, 114.627, 114.5922, 114.6321, 114.5804, 114.6046, 114.6028, 114.6232, 114.5792),
    c(-03.3346,  -3.2746, -3.2948,  -3.3424,  -3.3523,  -3.3304,  -3.3005,  -3.3141,  -3.3260,  -3.3552)
  )))

  # core
  banjarmasin_cover = gh_covering(banjarmasin)
  sf::st_crs(banjarmasin) = sf::st_crs(4326L)
  banjarmasin = sf::st_transform(banjarmasin, sf::st_crs(banjarmasin_cover))
  # use gUnaryUnion to overcome rgeos bug as reported 2019-08-16
  expect_false(anyNA(
    vapply(
      sf::st_intersects(banjarmasin, banjarmasin_cover),
      function(z) if (length(z) == 0L) NA_integer_ else z[1L],
      integer(1L)
    )
  ))
  expect_identical(
    sort(rownames(banjarmasin_cover))[1:10],
    c('qx3kzj', 'qx3kzm', 'qx3kzn', 'qx3kzp', 'qx3kzq', 'qx3kzr', 'qx3kzt', 'qx3kzv', 'qx3kzw', 'qx3kzx')
  )
  expect_length(banjarmasin_cover$geometry, 112L)

  # arguments
  expect_identical(nrow(gh_covering(banjarmasin, 5L)), 9L)
  banjarmasin_tight = gh_covering(banjarmasin, minimal = TRUE)
  expect_identical(
    sort(rownames(banjarmasin_tight))[1:10],
    c('qx3kzm', 'qx3kzx', 'qx3mp3', 'qx3mpb', 'qx3mpu', 'qx3mpz', 'qx3mr5', 'qx3sbt', 'qx3t06', 'qx3t22')
  )
  expect_identical(nrow(banjarmasin_tight), 10L)

  # errors
  expect_error(gh_covering(4L), 'Object to cover must be Spatial', fixed = TRUE)
})