# visual tests

test_that("`geom_alluvium` draws correctly", {
  skip_on_cran()
  skip_if_not_installed("vdiffr")

  d1 <- as.data.frame(Titanic)
  a1 <- aes(y = Freq, axis1 = Class, axis2 = Sex, axis3 = Age, fill = Survived)
  a2 <- aes(y = Freq, axis1 = Class, axis2 = Sex)
  vdiffr::expect_doppelganger(
    "`geom_alluvium`: basic",
    ggplot(d1, a1) + geom_alluvium()
  )
  vdiffr::expect_doppelganger(
    "`geom_alluvium`: facets",
    ggplot(d1, a2) +
      geom_alluvium(aes(fill = Age), width = .4) +
      facet_wrap(~ Survived, scales = "fixed")
  )
  
  skip_if_not_installed("alluvial")
  
  d2 <- alluvial::Refugees
  a3 <- aes(y = refugees, x = year, alluvium = country)
  vdiffr::expect_doppelganger(
    "`geom_alluvium`: bump plot",
    ggplot(d2, a3) +
      geom_alluvium(aes(fill = country), width = 1/4, decreasing = FALSE)
  )
  vdiffr::expect_doppelganger(
    "`geom_alluvium`: line plot",
    ggplot(d2, a3) +
      geom_alluvium(aes(fill = country),
                    width = 0, knot.pos = 0, outline.type = "upper")
  )
})

test_that("`geom_alluvium()` recognizes alternative curves", {
  data(vaccinations)
  
  skip_on_cran()
  skip_if_not_installed("vdiffr")
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: unscaled knot positions",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(knot.prop = FALSE)
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'linear' curve",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "linear")
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'cubic' curve",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "cubic")
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'quintic' curve",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "quintic")
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'sine' curve",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "sine")
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'arctangent' curve",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "arctan")
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'arctangent' curve with custom range",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "arctan", curve_range = 1)
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'sigmoid' curve",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "sigmoid")
  ))
  suppressWarnings(vdiffr::expect_doppelganger(
    "`geom_alluvium`: 'sigmoid' curve with custom range",
    ggplot(vaccinations,
           aes(x = survey, stratum = response, alluvium = subject,
               y = freq, fill = response)) +
      geom_alluvium(curve_type = "sigmoid", curve_range = 3)
  ))
})