test_that("export_plot works", {
  skip_on_cran() # requires chrome
  skip_if_not_installed(c("DiagrammeRsvg", "rsvg"))

  sfm <- xmile("SIR") |> sim_specs(stop = 10, dt = .1)

  # Plot sfm
  pl <- plot(sfm)
  file <- tempfile(fileext = ".png")
  expect_no_error(expect_no_message(expect_no_warning(export_plot(pl, file))))
  expect_true(file.exists(file))
  file.remove(file)

  # Plot simulation

  # Ubuntu throws error because it cannot access chrome
  skip_on_os("linux")
  skip_if_not_installed(c("htmlwidgets", "webshot2"))

  skip_if_not(has_internet()) # requires internet
  sim <- simulate(sfm)
  pl <- plot(sim)
  file <- tempfile(fileext = ".png")

  # This may throw a message "Reconnecting to chrome process;
  # All active sessions will be need to be respawned"
  expect_no_error(expect_no_warning(export_plot(pl, file)))
  expect_true(file.exists(file))
  file.remove(file)

  # Without file extension, default to png
  file <- "test"
  expect_no_error(expect_no_warning(export_plot(pl, file)))
  expect_true(file.exists(paste0(file, ".png")))
  file.remove(paste0(file, ".png"))
})


test_that("plot sfm", {
  # Empty models should throw error
  sfm0 <- xmile()
  expect_error(plot(sfm0), "Your model contains no variables")

  # A model with one variable should already be plottable
  sfm <- build(sfm0, "a", "constant")
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, show_constants = TRUE))))

  sfm <- build(sfm0, "a", "stock")
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm))))

  sfm <- build(sfm0, "a", "aux")
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, show_aux = TRUE))))

  sfm <- build(sfm0, "a", "flow")
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm))))

  # Test full models
  sfm <- xmile("SIR")

  # Plot sfm
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm))))

  # Try options
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, show_aux = FALSE, show_constants = TRUE, show_dependencies = FALSE))))

  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, show_aux = TRUE, show_constants = TRUE, show_dependencies = FALSE))))

  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, show_aux = FALSE, show_constants = TRUE, show_dependencies = TRUE))))

  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, show_aux = FALSE, show_constants = FALSE, show_dependencies = FALSE))))

  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, vars = "Susceptible"))))
  expect_no_error(expect_no_message(expect_no_warning(plot(sfm, vars = c("Infected", "Infection_Rate")))))
})


test_that("plot sim", {
  sfm <- xmile("SIR") |> sim_specs(stop = 10, dt = .1)

  # Plot simulation
  sim <- simulate(sfm)

  # Try options
  expect_no_error(expect_no_message(expect_no_warning(plot(sim))))

  # vars
  expect_no_error(expect_no_message(expect_no_warning(plot(sim, vars = c()))))
  expect_error(plot(sim, vars = c("a")), "a is not a variable in the model")
  expect_error(plot(sim, vars = c(1)), "vars must be a character vector")
  expect_no_error(expect_no_message(expect_no_warning(plot(sim, vars = c("Recovered")))))

  expect_no_error(expect_no_message(expect_no_warning(plot(sim, xlim = c(20, 30), ylim = c(0, 1)))))
})