context("Miscellaneous Functions ")

# generating monthly sequence
x <- seq(from=as.Date("1992-01-01"), by = "months", length.out = 12)


# test_that("water_year() interprets the origin argument correctly", {
#
#   # specify origin by an integer number
#   for(i in 1:12) {
#   expect_equal(water_year(x, origin = i, assign = "end"),
#                expected = as.factor(c(rep(1992, i - 1), rep(1993, 13 - i))))
#   }
#
#   # specify origin by a POSIX object
#   expect_equal(water_year(x, origin = as.POSIXct("2012-06-23"), assign = "end"),
#                expected = as.factor(c(rep(1992, 5), rep(1993, 7))))
#
#   # specify origin by a month name
#   expect_equal(water_year(x, origin = "may"),
#                expected = as.factor(c(rep(1991, 4), rep(1992, 8))))
#   expect_equal(water_year(x, origin = "Se"),
#                expected = as.factor(c(rep(1992, 8), rep(1993, 4))))
#
#   # specify origin by the abbreviation of an institution
#   expect_equal(water_year(x, origin = "din"),
#                expected = as.factor(c(rep(1992, 10), rep(1993, 2))))
#   expect_equal(water_year(x, origin = "usgs"),
#                expected = as.factor(c(rep(1992, 9), rep(1993, 3))))
# })
#
# test_that("water_year() interprets the assign argument correctly", {
#
#   expect_equal(water_year(x, origin = 4, assign = "majority"),
#                expected = as.factor(c(rep(1991, 3), rep(1992, 9))))
#   expect_equal(water_year(x, origin = 4, assign = "start"),
#                expected = as.factor(c(rep(1991, 3), rep(1992, 9))))
#
#   expect_equal(water_year(x, origin = 6, assign = "majority"),
#                expected = as.factor(c(rep(1991, 5), rep(1992, 7))))
#   expect_equal(water_year(x, origin = 6, assign = "start"),
#                expected = as.factor(c(rep(1991, 5), rep(1992, 7))))
#
#   expect_equal(water_year(x, origin = 7, assign = "majority"),
#                expected = as.factor(c(rep(1992, 6), rep(1993, 6))))
#   expect_equal(water_year(x, origin = 7, assign = "end"),
#                expected = as.factor(c(rep(1992, 6), rep(1993, 6))))
#
# })
#
# test_that("moving averages are computed correctly", {
#   # if window is of length 1, output equals input
#   x <- 1:10
#   expect_equal(ma(x, n = 1), x)
#   expect_equal(ma(x, n = 1, sides = 2), x)
#
#   # centered window vs. past values
#   expect_equal(ma(x, n = 3, sides = 2), c(NA, 2:9, NA))
#   expect_equal(ma(x, n = 3), c(NA, NA, 2:9))
# })


test_that("fill_na handles non-finite max.len argument", {
  n <- 100
  x <- rnorm(n)
  x[sample(x = n, size = 20)] <- NA

  # max.len = 0: no interpolation
  expect_equal(fill_na(x, max.len = 0), x)

  # max.len = Inf: behave like approx()
  expect_equal(fill_na(x, max.len = Inf),
               approx(seq_len(n), x, seq_len(n))$y)
})


test_that("fill_na interpolates sequences", {
  y <- x <- seq(10, 2000, by = 34)
  x[sample(length(x), size = 20)] <- NA

  # margins should be finite
  idx <- c(1, length(y))
  x[idx] <- y[idx]

  expect_equal(fill_na(x, max.len = Inf), y)
})