test_that("bcrosspred basic structure (crossbasis)", {
  skip_on_cran()
  skip_if_not(check_inla(), "INLA not available")

  #cpred build in helper.R

  expect_s3_class(cpred, "bcrosspred")
  expect_equal(length(cpred), 16)
  expect_equal(
    names(cpred),
    c(
      "exp_at",
      "lag_at",
      "cen",
      "coefficients",
      "matfit",
      "allfit",
      "matRRfit",
      "allRRfit",
      "coefficients.summary",
      "matfit.summary",
      "allfit.summary",
      "matRRfit.summary",
      "allRRfit.summary",
      "ci.level",
      "model.class",
      "model.link"
    )
  )

  expect_equal(cpred$exp_at, temp)
  expect_equal(cpred$cen, 12.85)
  expect_equal(
    cpred$lag_at,
    seq(attr(cb, "lag")[1], attr(cb, "lag")[2], by = 1)
  )
  expect_equal(dim(cpred$coefficients), c(20, n_sim))
  expect_equal(rownames(cpred$coefficients), paste0("cb", colnames(cb)))
  expect_equal(dim(cpred$matfit), c(length(temp), 22, n_sim))
  expect_equal(rownames(cpred$matfit), as.character(temp))
  expect_equal(dim(cpred$allfit), c(length(temp), n_sim))
  expect_equal(rownames(cpred$allfit), as.character(temp))
  expect_true(all(cpred$allRRfit > 0))
  expect_equal(dim(cpred$matfit.summary), c(length(temp), 22, 6))
  expect_equal(cpred$ci.level, 0.95)
  expect_equal(cpred$model.class, "inla")
  expect_equal(cpred$model.link, "log")
})

test_that("bcrosspred basic structure (onebasis)", {
  skip_on_cran()
  skip_if_not(check_inla(), "INLA not available")

  ob <- dlnm::onebasis(slondon$tmean, "strata", breaks = c(5, 10, 20))
  mod_2 <- suppressWarnings(bdlnm(
    mort_75plus ~ ob + factor(dow) + seas,
    data = slondon,
    family = "poisson",
    sample.arg = list(n = n_sim, seed = 1L)
  ))
  cpred_2 <- bcrosspred(mod_2, exp_at = temp)

  expect_s3_class(cpred_2, "bcrosspred")
  expect_equal(length(cpred_2), 14)
  expect_equal(
    names(cpred_2),
    c(
      "exp_at",
      "coefficients",
      "matfit",
      "allfit",
      "matRRfit",
      "allRRfit",
      "coefficients.summary",
      "matfit.summary",
      "allfit.summary",
      "matRRfit.summary",
      "allRRfit.summary",
      "ci.level",
      "model.class",
      "model.link"
    )
  )

  expect_equal(cpred_2$exp_at, temp)
  expect_equal(cpred_2$lag_at, NULL)
  expect_equal(dim(cpred_2$coefficients), c(3, n_sim))
  expect_equal(rownames(cpred_2$coefficients), paste0("ob", colnames(ob)))
  expect_equal(dim(cpred_2$matfit), c(length(temp), 1, n_sim))
  expect_equal(rownames(cpred_2$matfit), as.character(temp))
  expect_equal(dim(cpred_2$allfit), c(length(temp), n_sim))
  expect_equal(rownames(cpred_2$allfit), as.character(temp))
  expect_true(all(cpred_2$allRRfit > 0))
  expect_equal(dim(cpred_2$matfit.summary), c(length(temp), 1, 6))
  expect_equal(cpred_2$ci.level, 0.95)
  expect_equal(cpred_2$model.class, "inla")
  expect_equal(cpred_2$model.link, "log")
})

test_that("works with two different basis", {
  skip_on_cran()
  skip_if_not(check_inla(), "INLA not available")

  ob <- dlnm::onebasis(slondon$tmean, "strata", breaks = c(5, 10, 20))
  mod_2 <- suppressWarnings(bdlnm(
    mort_75plus ~ cb + ob + factor(dow) + seas,
    data = slondon,
    family = "poisson",
    sample.arg = list(n = n_sim, seed = 1L)
  ))

  expect_error(bcrosspred(mod_2, exp_at = temp))

  cpred_2 <- bcrosspred(mod_2, "ob", exp_at = temp)

  expect_s3_class(cpred_2, "bcrosspred")
  expect_equal(length(cpred_2), 14)
  expect_equal(
    names(cpred_2),
    c(
      "exp_at",
      "coefficients",
      "matfit",
      "allfit",
      "matRRfit",
      "allRRfit",
      "coefficients.summary",
      "matfit.summary",
      "allfit.summary",
      "matRRfit.summary",
      "allRRfit.summary",
      "ci.level",
      "model.class",
      "model.link"
    )
  )

  expect_equal(cpred_2$exp_at, temp)
  expect_equal(cpred_2$lag_at, NULL)
  expect_equal(dim(cpred_2$coefficients), c(3, n_sim))
  expect_equal(rownames(cpred_2$coefficients), paste0("ob", colnames(ob)))
  expect_equal(dim(cpred_2$matfit), c(length(temp), 1, n_sim))
  expect_equal(rownames(cpred_2$matfit), as.character(temp))
  expect_equal(dim(cpred_2$allfit), c(length(temp), n_sim))
  expect_equal(rownames(cpred_2$allfit), as.character(temp))
  expect_true(all(cpred_2$allRRfit > 0))
  expect_equal(dim(cpred_2$matfit.summary), c(length(temp), 1, 6))
  expect_equal(cpred_2$ci.level, 0.95)
  expect_equal(cpred_2$model.class, "inla")
  expect_equal(cpred_2$model.link, "log")
})

test_that("bcrosspred errors when some argument is missing or invalid", {
  skip_on_cran()
  skip_if_not(check_inla(), "INLA not available")

  expect_snapshot_error(bcrosspred(NULL, exp_at = temp))

  expect_snapshot_error(bcrosspred(list(a = 1), "cb", exp_at = temp))

  expect_snapshot_error(bcrosspred(mod, basis = "cb1", exp_at = temp))

  expect_warning(cpred2 <- bcrosspred(mod))

  expect_equal(length(cpred2$exp_at), 48)
})