stopifnot(
  require("testthat"),
  require("clustTMB")
)

context("spatial-utils")

test_that("no mesh", {
  no.mesh.list <- list(
    "n_s"      = 1,
    "n_tri"    = 0,
    "Tri_Area" = matrix(0, 1, 2),
    "E0"       = matrix(0, 1, 2),
    "E1"       = matrix(0, 1, 2),
    "E2"       = matrix(0, 1, 2),
    "TV"       = matrix(0, 1, 3),
    "G0"       = fmesher::fm_as_dgTMatrix(matrix(0, 2, 2)),
    "G0_inv"   = fmesher::fm_as_dgTMatrix(matrix(0, 2, 2))
  )
  expect_equal(spdeStruct(NULL), no.mesh.list)

  n <- 100
  set.seed(123)
  loc <- data.frame(x = runif(n, 0, 1), y = runif(n, 0, 1))
  Loc <- sf::st_as_sf(loc, coords = c("x", "y"))
  spatial.list <- list(
    loc = Loc,
    mesh = NULL,
    init.range = list(
      gating.range = NULL,
      expert.range = NULL
    )
  )
  spDat <- suppressWarnings(setup.spatialDat(n, spatial.list, NULL))
  expect_equal(
    spDat$mesh,
    fmesher::fm_rcdt_2d(as.matrix(loc))
  )
  expect_warning(setup.spatialDat(n, spatial.list, NULL))
  expect_equal(spDat$A, fmesher::fm_basis(spDat$mesh, as.matrix(loc)))
})

test_that("mesh", {
  set.seed(123)
  Loc <- matrix(
    runif(20), 10, 2
  )
  mesh <- fmesher::fm_rcdt_2d(Loc)
  mesh.clustTMB <- spdeStruct(mesh)
  spde <- fmesher::fm_fem(mesh)
  # ---------- Begin code that prepares object for anisotropy.
  Dset <- 1:2
  # Triangle info
  TV <- mesh$graph$tv # Triangle to vertex indexing
  V0 <- mesh$loc[TV[, 1], Dset] # V = vertices for each triangle
  V1 <- mesh$loc[TV[, 2], Dset]
  V2 <- mesh$loc[TV[, 3], Dset]
  E0 <- V2 - V1 # E = edge for each triangle
  E1 <- V0 - V2
  E2 <- V1 - V0
  # Calculate Areas
  TmpFn <- function(Vec1, Vec2) abs(det(rbind(Vec1, Vec2)))
  Tri_Area <- rep(NA, nrow(E0))
  # T = area of each triangle
  for (t in seq_along(Tri_Area)) Tri_Area[t] <- TmpFn(E0[t, ], E1[t, ]) / 2
  # ---------- End code that prepare objects for anisotropy.
  spde.list <- list(
    "n_s"      = mesh$n,
    "n_tri"    = nrow(TV),
    "Tri_Area" = Tri_Area,
    "E0"       = E0,
    "E1"       = E1,
    "E2"       = E2,
    "TV"       = TV - 1,
    "G0"       = spde$c0,
    "G0_inv"   = fmesher::fm_as_dgTMatrix(diag(1 / diag(spde$c0)))
  )

  expect_equal(mesh.clustTMB, spde.list)

  spatial.list <- list(
    loc = NULL,
    mesh = mesh,
    init.range = list(
      gating.range = NULL,
      expert.range = NULL
    )
  )
  spDat <- suppressWarnings(setup.spatialDat(10, spatial.list, NULL))
  expect_equal(spDat$mesh, mesh)
  expect_equal(
    spDat$A,
    fmesher::fm_basis(mesh, mesh$loc[mesh$idx$loc, 1:2])
  )
  expect_message(setup.spatialDat(10, spatial.list, NULL))

  n <- 100
  set.seed(123)
  loc <- data.frame(x = runif(n, 0, 1), y = runif(n, 0, 1))
  Loc <- sf::st_as_sf(loc, coords = c("x", "y"))
  spatial.list <- list(
    loc = Loc,
    mesh = mesh,
    init.range = list(
      gating.range = NULL,
      expert.range = NULL
    )
  )

  spDat <- suppressWarnings(setup.spatialDat(10, spatial.list, NULL))
  expect_equal(spDat$mesh, mesh)
  expect_equal(
    spDat$A,
    fmesher::fm_basis(mesh, Loc)
  )
  expect_message(setup.spatialDat(10, spatial.list, NULL))
})