test_that("dm_zoom_to() works", {
  # no zoom in unzoomed `dm`
  expect_false(
    is_zoomed(dm_for_filter())
  )

  # zoom in zoomed `dm`
  expect_true(
    is_zoomed(dm_for_filter() %>% dm_zoom_to(tf_1))
  )

  expect_s3_class(
    dm_for_filter() %>% dm_zoom_to(tf_3),
    c("dm_zoomed", "dm")
  )
})


test_that("dm_discard_zoomed() works", {
  # no zoom in zoomed out from zoomed `dm`
  expect_false(is_zoomed(dm_for_filter() %>% dm_zoom_to(tf_1) %>% dm_discard_zoomed()))

  expect_s3_class(
    dm_for_filter() %>% dm_zoom_to(tf_3) %>% dm_discard_zoomed(),
    c("dm")
  )
})

test_that("print() and format() methods for subclass `dm_zoomed` work", {
  expect_snapshot(
    dm_for_filter() %>% dm_zoom_to(tf_5) %>% as_dm_zoomed_df() %>% tbl_sum()
  )

  expect_snapshot(
    dm_for_filter() %>% dm_zoom_to(tf_2) %>% as_dm_zoomed_df() %>% tbl_sum()
  )
})


test_that("dm_get_zoom() and tbl_zoomed() works", {
  expect_identical(
    dm_for_filter() %>%
      dm_zoom_to(tf_2) %>%
      dm_get_zoom() %>%
      pluck("table"),
    "tf_2"
  )
  expect_equivalent_tbl(
    dm_for_filter() %>%
      dm_zoom_to(tf_2) %>%
      dm_get_zoom() %>%
      pluck("zoom") %>%
      pluck(1),
    tf_2()
  )

  # function for getting only the tibble itself works
  expect_equivalent_tbl(
    dm_for_filter() %>% dm_zoom_to(tf_3) %>% tbl_zoomed(),
    tf_3()
  )
})

test_that("dm_insert_zoomed() works", {
  # test that a new tbl is inserted, based on the requested one
  expect_equivalent_dm(
    dm_zoom_to(dm_for_filter(), tf_4) %>%
      dm_insert_zoomed("tf_4_new"),
    dm_for_filter() %>%
      dm(tf_4_new = tf_4()) %>%
      dm_add_pk(tf_4_new, h) %>%
      dm_add_fk(tf_4_new, c(j, j1), tf_3) %>%
      dm_add_fk(tf_5, l, tf_4_new, on_delete = "cascade")
  )

  # test that an error is thrown if 'repair = check_unique' and duplicate table names
  expect_dm_error(
    dm_zoom_to(dm_for_filter(), tf_4) %>% dm_insert_zoomed("tf_4", repair = "check_unique"),
    "need_unique_names"
  )

  # test that in case of 'repair = unique' and duplicate table names -> renames of old and new
  expect_equivalent_dm(
    # FIXME: This produced occasional warnings on GitHub Actions, why?
    dm_for_filter() %>%
      dm_zoom_to(tf_4) %>%
      dm_insert_zoomed("tf_4", repair = "unique", quiet = TRUE),
    dm_for_filter() %>%
      dm_rename_tbl(tf_4...4 = tf_4) %>%
      dm(tf_4...7 = tf_4()) %>%
      dm_add_pk(tf_4...7, h) %>%
      dm_add_fk(tf_4...7, c(j, j1), tf_3) %>%
      dm_add_fk(tf_5, l, tf_4...7, on_delete = "cascade")
  )
})

test_that("dm_update_tbl() works", {
  # setting table tf_7 as zoomed table for tf_6 and removing its primary key and foreign keys pointing to it
  new_dm_for_filter <-
    dm_get_def(dm_for_filter()) %>%
    mutate(
      zoom = if_else(table == "tf_6", list(tf_7()), list(NULL)),
      col_tracker_zoom = if_else(table == "tf_6", list(character()), list(NULL)),
    ) %>%
    new_dm3(zoomed = TRUE)

  # test that the old table is updated correctly
  expect_equivalent_dm(
    dm_update_zoomed(new_dm_for_filter),
    dm_for_filter() %>%
      dm_select_tbl(-tf_6) %>%
      dm(tf_6 = tf_7())
  )
})

# after #271:
test_that("all cols are tracked in zoomed table", {
  skip_if_not_installed("nycflights13")

  expect_identical(
    dm_nycflights_small() %>%
      dm_zoom_to(flights) %>%
      col_tracker_zoomed(),
    set_names(colnames(dm_nycflights_small()$flights))
  )
})


# tests for compound keys -------------------------------------------------

test_that("zoom output for compound keys", {
  # FIXME: COMPOUND: Need proper test
  skip_if_remote_src()

  expect_snapshot({
    nyc_comp() %>% dm_zoom_to(weather)
    nyc_comp() %>%
      dm_zoom_to(weather) %>%
      dm_update_zoomed()
    nyc_comp_2 <-
      nyc_comp() %>%
      dm_zoom_to(weather) %>%
      dm_insert_zoomed("weather_2")
    nyc_comp_2 %>%
      get_all_keys()
    attr(igraph::E(create_graph_from_dm(nyc_comp_2)), "vnames")

    nyc_comp_3 <-
      nyc_comp() %>%
      dm_zoom_to(flights) %>%
      dm_insert_zoomed("flights_2")
    nyc_comp_3 %>%
      get_all_keys()
    attr(igraph::E(create_graph_from_dm(nyc_comp_3)), "vnames")
  })
})

test_that("dm_get_zoom() works to zoom on empty tables", {
  zdm <- dm(x = tibble()) %>% dm_zoom_to(x)
  expect_identical(
    dm_get_zoom(zdm),
    tibble(table = "x", zoom = list(tibble()))
  )
})


# test that inserting a zoomed table retains the color --------------------

test_that("dm_insert_zoomed() retains color", {
  expect_identical(
    dm_for_filter() %>%
      dm_set_colors("cyan" = tf_2) %>%
      dm_zoom_to(tf_2) %>%
      dm_insert_zoomed("tf_2_new") %>%
      dm_get_def() %>%
      filter(table == "tf_2_new") %>%
      pull(display),
    "#00FFFFFF"
  )
})