test_that("data source found", {
  expect_false(is_null(my_test_src_fun()))
  expect_silent(my_test_src_fun()())
})

test_that("copy_dm_to() copies data frames to databases", {
  skip_if_ide()

  expect_equivalent_dm(
    copy_dm_to(my_db_test_src(), collect(dm_for_filter())),
    dm_for_filter()
  )

  expect_equivalent_dm(
    copy_dm_to(my_db_test_src(), dm_for_filter()),
    dm_for_filter()
  )

  # FIXME: How to test writing permanent tables without and be sure they are removed at the end independent what 'my_test_src()' is?
})

test_that("copy_dm_to() copies data frames from any source", {
  expect_equivalent_dm(
    expect_deprecated_obj(
      copy_dm_to(default_local_src(), dm_for_filter())
    ),
    dm_for_filter()
  )
})

# FIXME: Add test that set_key_constraints = FALSE doesn't set key constraints,
# in combination with dm_learn_from_db

test_that("copy_dm_to() rejects overwrite and types arguments", {
  expect_snapshot(error = TRUE, {
    copy_dm_to(my_test_src(), dm_for_filter(), overwrite = TRUE)
  })

  expect_snapshot(error = TRUE, {
    copy_dm_to(my_test_src(), dm_for_filter(), types = character())
  })
})

test_that("copy_dm_to() fails with duplicate table names", {
  bad_names <- set_names(names(dm_for_filter()))
  bad_names[[2]] <- bad_names[[1]]

  expect_dm_error(
    copy_dm_to(my_db_test_src(), dm_for_filter(), table_names = bad_names),
    class = "copy_dm_to_table_names_duplicated"
  )
})

test_that("default table repair works", {
  skip_if_not_installed("mockr")

  con <- con_from_src_or_con(my_db_test_src())

  table_names <- c("t1", "t2", "t3")

  calls <- 0

  my_unique_db_table_name <- function(table_name) {
    calls <<- calls + 1
    glue::glue("{table_name}_2020_05_15_10_45_29_0")
  }

  mockr::with_mock(
    unique_db_table_name = my_unique_db_table_name,
    {
      repair_table_names_for_db(table_names, temporary = FALSE, con)
      expect_equal(calls, 0)
      repair_table_names_for_db(table_names, temporary = TRUE, con)
      expect_gt(calls, 0)
    },
    .env = asNamespace("dm")
  )
})

test_that("copy_dm_to() fails legibly if target schema missing for MSSQL & Postgres", {
  skip_if_src_not(c("mssql", "postgres"))

  src_db <- my_test_src()
  local_dm <- dm_for_filter() %>% collect()

  expect_deprecated(expect_false(db_schema_exists(src_db, "copy_dm_to_schema")))

  expect_error(
    copy_dm_to(src_db, local_dm, schema = "copy_dm_to_schema", temporary = FALSE)
  )
})

test_that("copy_dm_to() fails legibly with schema argument for MSSQL & Postgres", {
  skip_if_src_not(c("mssql", "postgres"))

  src_db <- my_test_src()
  local_dm <- dm_for_filter() %>% collect()

  expect_false(db_schema_exists(src_db$con, "copy_dm_to_schema"))

  db_schema_create(src_db$con, "copy_dm_to_schema")

  withr::defer({
    try(DBI::dbExecute(src_db$con, "DROP SCHEMA copy_dm_to_schema"))
  })

  expect_dm_error(
    copy_dm_to(src_db, local_dm, schema = "copy_dm_to_schema"),
    "temporary_not_in_schema"
  )

  expect_dm_error(
    copy_dm_to(
      src_db,
      local_dm,
      schema = "copy_dm_to_schema",
      temporary = FALSE,
      table_names = set_names(letters[1:6], src_tbls_impl(local_dm))
    ),
    "one_of_schema_table_names"
  )
})

test_that("copy_dm_to() works with schema argument for MSSQL & Postgres", {
  skip_if_src_not(c("mssql", "postgres"))

  src_db <- my_test_src()
  local_dm <- dm_for_filter() %>% collect()

  expect_false(db_schema_exists(src_db$con, "copy_dm_to_schema"))

  db_schema_create(src_db$con, "copy_dm_to_schema")

  withr::defer({
    order_of_deletion <- c("tf_2", "tf_1", "tf_5", "tf_6", "tf_4", "tf_3")
    walk(
      dm_get_tables_impl(remote_dm)[order_of_deletion],
      ~ try(DBI::dbExecute(src_db$con, paste0("DROP TABLE ", remote_name_qual(.x))))
    )
    try(DBI::dbExecute(src_db$con, "DROP SCHEMA copy_dm_to_schema"))
  })

  expect_silent(
    remote_dm <- copy_dm_to(
      src_db,
      local_dm,
      schema = "copy_dm_to_schema",
      temporary = FALSE
    )
  )

  if (is_postgres(src_db)) {
    table_tibble <- sql_schema_table_list_postgres(src_db, "copy_dm_to_schema")
  } else if (is_mssql(src_db)) {
    table_tibble <- sql_schema_table_list_mssql(src_db, "copy_dm_to_schema")
  }

  tbl_names <- names(remote_dm)
  # compare names and remote names
  expect_identical(
    table_tibble %>% arrange(table_name) %>% deframe(),
    purrr::map(set_names(tbl_names), ~ DBI::Id(schema = "copy_dm_to_schema", table = .x))
  )
})

test_that("copy_dm_to() fails with schema argument for databases where schema is unsupported", {
  skip_if_schema_supported()

  local_dm <- dm_for_filter() %>% collect()

  expect_dm_error(
    copy_dm_to(
      my_test_src(),
      local_dm,
      temporary = FALSE,
      schema = "test"
    ),
    "no_schemas_supported"
  )
})

test_that("copy_dm_to() works with autoincrement PKs and FKS on selected DBs", {
  skip_if_src_not(c("postgres", "sqlite", "mssql", "maria"))

  con_db <- my_test_con()
  local_dm_ptype <-
    dm_for_autoinc_1() %>%
    dm_ptype() %>%
    dm_add_pk(t1, a, autoincrement = TRUE) %>%
    dm_add_pk(t2, c, autoincrement = TRUE) %>%
    dm_add_fk(t2, d, t1) %>%
    dm_add_fk(t3, e, t1) %>%
    dm_add_fk(t4, h, t2) %>%
    # Avoid clash with other test that uses the same table names
    dm_rename_tbl(xt1 = t1, xt2 = t2, xt3 = t3, xt4 = t4)

  withr::defer({
    order_of_deletion <- c("xt4", "xt2", "xt3", "xt1")
    walk(
      dm_get_tables_impl(remote_dm)[order_of_deletion],
      ~ try(DBI::dbExecute(con_db, paste0("DROP TABLE ", dbplyr::remote_name(.x))))
    )
  })

  # FIXME: how to check if autoincrement is actually set on DB?
  expect_silent(
    remote_dm <- copy_dm_to(
      con_db,
      local_dm_ptype,
      temporary = FALSE
    )
  )

  collected_dm <- remote_dm %>%
    collect()

  expect_equivalent_dm(
    local_dm_ptype,
    collected_dm
  )
})