context("na_mean")

test_that("All NA vector throws error", {
  expect_error(na_mean(c(NA, NA, NA, NA, NA)))
})

test_that("Correct results for all options with a modifed tsAirgap dataset (additionalNAs at end)", {
  skip_on_cran()

  # Using mean over resulting vector to check correctness
  # In order to avoid writing down the complete resulting vector
  # Using rounded version in order to avoid writing down all decimals
  x <- tsAirgap
  x[135:144] <- NA
  expect_equal(round(mean(na_mean(x, option = "median")), digits = 1), 260.0)
  expect_equal(round(mean(na_mean(x, option = "mean")), digits = 1), 264.1)
  expect_equal(round(mean(na_mean(x, option = "mode")), digits = 1), 258.8)
})

test_that("Correct results for all options with a modifed tsAirgap dataset (additionalNAs at start)", {
  skip_on_cran()

  # Using mean over resulting vector to check correctness
  # In order to avoid writing down the complete resulting vector
  # Using rounded version in order to avoid writing down all decimals
  x <- tsAirgap
  x[1:5] <- NA
  expect_equal(round(mean(na_mean(x, option = "median")), digits = 1), 282.7)
  expect_equal(round(mean(na_mean(x, option = "mean")), digits = 1), 284.8)
  expect_equal(round(mean(na_mean(x, option = "mode")), digits = 1), 278.2)
})


test_that("Correct results for all options with the tsAirgap dataset", {
  skip_on_cran()

  # Using mean over resulting vector to check correctness
  # In order to avoid writing down the complete resulting vector
  # Using rounded version in order to avoid writing down all decimals
  x <- tsAirgap
  expect_equal(round(mean(na_mean(x, option = "median")), digits = 1), 277.9)
  expect_equal(round(mean(na_mean(x, option = "mean")), digits = 1), 279.8)
  expect_equal(round(mean(na_mean(x, option = "mode")), digits = 1), 275.2)
})

test_that("Imputation works for data.frame", {
  # Checking if NAs remain in data.frame
  x <- data.frame(tsAirgap, tsAirgap, tsAirgapComplete)
  expect_false(anyNA(na_mean(x, option = "mean")))
  expect_false(anyNA(na_mean(x, option = "mode")))
  expect_false(anyNA(na_mean(x, option = "median")))
})

test_that("Warning for wrong input for option parameter", {
  expect_error(na_mean(tsAirgap, option = "Wrong"))
})


test_that("Test NA at beginning", {
  x <- tsAirgap
  x[1:4] <- NA
  expect_false(anyNA(na_mean(x, option = "mean")))
  expect_false(anyNA(na_mean(x, option = "mode")))
  expect_false(anyNA(na_mean(x, option = "median")))
  expect_false(anyNA(na_mean(x)))
})

test_that("Test NA at end", {
  x <- tsAirgap
  x[140:144] <- NA
  expect_false(anyNA(na_mean(x, option = "mean")))
  expect_false(anyNA(na_mean(x, option = "mode")))
  expect_false(anyNA(na_mean(x, option = "median")))
  expect_false(anyNA(na_mean(x)))
})

test_that("Multiple NAs in a row", {
  x <- tsAirgap
  x[40:80] <- NA
  expect_false(anyNA(na_mean(x, option = "mean")))
  expect_false(anyNA(na_mean(x, option = "mode")))
  expect_false(anyNA(na_mean(x, option = "median")))
  expect_false(anyNA(na_mean(x)))
})

test_that("Over 90% NAs", {
  x <- tsAirgap
  x[10:140] <- NA
  expect_false(anyNA(na_mean(x, option = "mean")))
  expect_false(anyNA(na_mean(x, option = "mode")))
  expect_false(anyNA(na_mean(x, option = "median")))
  expect_false(anyNA(na_mean(x)))
})
