skip_if_not_installed("crch")

data("RainIbk", package = "crch")
RainIbk$sqrtensmean <<- apply(sqrt(RainIbk[, grep("^rainfc", names(RainIbk))]), 1, mean)
RainIbk$sqrtenssd <<- apply(sqrt(RainIbk[, grep("^rainfc", names(RainIbk))]), 1, sd)

m1 <- crch::crch(sqrt(rain) ~ sqrtensmean, data = RainIbk, dist = "gaussian")

test_that("model_info", {
  expect_false(model_info(m1)$is_linear)
  expect_true(model_info(m1)$is_censored)
})

test_that("find_predictors", {
  expect_identical(find_predictors(m1), list(conditional = c("sqrtensmean")))
  expect_identical(find_predictors(m1, flatten = TRUE), c("sqrtensmean"))
  expect_null(find_predictors(m1, effects = "random"))
})

test_that("find_random", {
  expect_null(find_random(m1))
})

test_that("get_random", {
  expect_warning(get_random(m1))
})

test_that("find_response", {
  expect_identical(find_response(m1), "rain")
})

test_that("get_response", {
  expect_equal(get_response(m1), RainIbk$rain)
})

test_that("get_predictors", {
  expect_equal(colnames(get_predictors(m1)), c("sqrtensmean"))
})

test_that("link_inverse", {
  expect_equal(link_inverse(m1)(0.2), 0.2, tolerance = 1e-5)
})

test_that("get_data", {
  expect_equal(nrow(get_data(m1)), 4971)
  expect_equal(colnames(get_data(m1)), c("rain", "sqrtensmean"))
})

test_that("find_formula", {
  expect_length(find_formula(m1), 1)
  expect_equal(
    find_formula(m1),
    list(conditional = as.formula("sqrt(rain) ~ sqrtensmean")),
    ignore_attr = TRUE
  )
})

test_that("find_terms", {
  expect_equal(
    find_terms(m1),
    list(
      response = "sqrt(rain)",
      conditional = c("sqrtensmean")
    )
  )
  expect_equal(
    find_terms(m1, flatten = TRUE),
    c("sqrt(rain)", "sqrtensmean")
  )
})

test_that("find_variables", {
  expect_equal(
    find_variables(m1),
    list(
      response = "rain",
      conditional = c("sqrtensmean")
    )
  )
  expect_equal(
    find_variables(m1, flatten = TRUE),
    c("rain", "sqrtensmean")
  )
})

test_that("n_obs", {
  expect_equal(n_obs(m1), 4971)
})

test_that("linkfun", {
  expect_false(is.null(link_function(m1)))
})

test_that("find_parameters", {
  expect_equal(
    find_parameters(m1),
    list(
      conditional = c("(Intercept)", "sqrtensmean", "(scale)_(Intercept)")
    )
  )
  expect_equal(nrow(get_parameters(m1)), 3)
  expect_equal(
    get_parameters(m1)$Parameter,
    c("(Intercept)", "sqrtensmean", "(scale)_(Intercept)")
  )
})

test_that("is_multivariate", {
  expect_false(is_multivariate(m1))
})

test_that("find_statistic", {
  expect_identical(find_statistic(m1), "z-statistic")
})