# ------------------------------------------------------------------------------
# phop_index_vec

test_that("phop_index_vec() works", {
  expect_identical(phop_index_vec(list(1L, 1L), 1, 1, 1, ~ .x + .y), 2L)
})

test_that("phop_index_vec() doesn't retains names of first input (#75)", {
  expect_named(
    phop_index_vec(list(c(x = 1L), c(y = 1L)), 1, 1, 1, ~ .x + .y),
    NULL
  )
})

test_that("phop_index_vec() can simplify automatically", {
  expect_identical(
    phop_index_vec(list(1, 2), 1, 1, 1, ~ .x + .y, .ptype = NULL),
    3
  )
})

test_that("phop_index_vec() errors if it can't simplify", {
  fn <- function(x, y) {
    if (x == 1L) {
      1
    } else {
      "hi"
    }
  }
  expect_snapshot({
    (expect_error(
      phop_index_vec(list(1:2, 1:2), 1:2, 1:2, 1:2, fn, .ptype = NULL),
      class = "vctrs_error_incompatible_type"
    ))
  })
})

test_that("completely empty input returns ptype", {
  expect_equal(
    phop_index_vec(list(), integer(), integer(), integer(), ~.x),
    NULL
  )
  expect_equal(
    phop_index_vec(
      list(),
      integer(),
      integer(),
      integer(),
      ~.x,
      .ptype = list()
    ),
    list()
  )
  expect_equal(
    phop_index_vec(
      list(),
      integer(),
      integer(),
      integer(),
      ~.x,
      .ptype = int()
    ),
    int()
  )
})

test_that("empty `.l` and `.i`, but size `n > 0` `.starts` and `.stops` returns size `n` ptype", {
  expect_identical(
    phop_index_vec(list(), integer(), 1:2, 2:3, ~2, .ptype = int()),
    c(2L, 2L)
  )
  expect_identical(
    phop_index_vec(list(), integer(), 1:2, 2:3, ~2, .ptype = NULL),
    c(2, 2)
  )
})

test_that("can't access non-existant `.x` with empty `.l` and `.i`, but size `n > 0` `.starts` and `.stops`", {
  # Note: Error message seems platform dependent
  expect_error(phop_index_vec(list(), integer(), 1:2, 2:3, ~.x, .ptype = int()))
})

# ------------------------------------------------------------------------------
# .ptype

test_that("`.ptype = NULL` validates that element lengths are 1", {
  expect_snapshot(error = TRUE, {
    phop_index_vec(
      list(1:2, 1:2),
      1:2,
      1:2,
      1:2,
      ~ if (.x == 1L) {
        1:2
      } else {
        1
      },
      .ptype = NULL
    )
  })
  expect_snapshot(error = TRUE, {
    phop_index_vec(
      list(1:2, 1:2),
      1:2,
      1:2,
      1:2,
      ~ if (.x == 1L) {
        NULL
      } else {
        2
      },
      .ptype = NULL
    )
  })
})

test_that("size 0 `.starts` / `.stops` returns size 0 `.ptype`", {
  expect_identical(
    phop_index_vec(list(1:5), 1:5, integer(), integer(), ~.x, .ptype = NULL),
    NULL
  )
  expect_identical(
    phop_index_vec(
      list(1:5),
      1:5,
      integer(),
      integer(),
      ~.x,
      .ptype = double()
    ),
    double()
  )
})

test_that("`phop_index_vec()` falls back to `c()` method as required", {
  local_c_foobar()

  expect_identical(
    phop_index_vec(
      list(1:3, 1:3),
      1:3,
      1:3,
      1:3,
      ~ foobar(.x),
      .ptype = foobar(integer())
    ),
    foobar(1:3)
  )
  expect_condition(
    phop_index_vec(
      list(1:3, 1:3),
      1:3,
      1:3,
      1:3,
      ~ foobar(.x),
      .ptype = foobar(integer())
    ),
    class = "slider_c_foobar"
  )

  expect_identical(
    phop_index_vec(list(1:3, 1:3), 1:3, 1:3, 1:3, ~ foobar(.x)),
    foobar(1:3)
  )
  expect_condition(
    phop_index_vec(list(1:3, 1:3), 1:3, 1:3, 1:3, ~ foobar(.x)),
    class = "slider_c_foobar"
  )
})