context("parse: inplace")

test_that("can't use integer inplace for update()", {
  expect_error(odin_parse({
    q[] <- user()
    p[] <- q[i] / sum(q)
    initial(x[]) <- 0
    update(x[]) <- rmultinom(5, p)
    dim(p) <- 5
    dim(q) <- 5
    dim(x) <- 5
  }),
  "Can't use inplace integer expression in update",
  class = "odin_error")
})


test_that("can't use multiline inplace", {
  expect_error(odin_parse({
    q[] <- user()
    p[] <- q[i] / sum(q)
    initial(x[]) <- 0
    update(x[]) <- y[i]
    y[] <- rmultinom(5, p)
    y[1] <- 0
    dim(p) <- 5
    dim(q) <- 5
    dim(x) <- 5
    dim(y) <- 5
  }),
  "in-place equations may only be used on a single-line array",
  class = "odin_error")
})


test_that("rmultinom is integer", {
  ir <- odin_parse({
    q[] <- user()
    p[] <- q[i] / sum(q)
    initial(x[]) <- 0
    update(x[]) <- y[i]
    y[] <- rmultinom(5, p)
    dim(p) <- 5
    dim(q) <- 5
    dim(x) <- 5
    dim(y) <- 5
  })
  dat <- ir_deserialise(ir)
  expect_equal(dat$data$elements$y$storage_type, "int")
  expect_equal(dat$data$elements$y$rank, 1)
})


test_that("rmhyper is integer", {
  ir <- odin_parse({
    x0[] <- user()
    dim(x0) <- user()
    n <- user()
    nk <- length(x0)
    tmp[] <- rmhyper(n, x0)
    dim(tmp) <- nk
    initial(x[]) <- 0
    update(x[]) <- tmp[i]
    dim(x) <- nk
  })
  dat <- ir_deserialise(ir)
  expect_equal(dat$data$elements$tmp$storage_type, "int")
  expect_equal(dat$data$elements$tmp$rank, 1)
})


test_that("rmultinom argument validation", {
  expect_error(odin_parse({
    update(x) <- 1
    initial(x) <- 1
    p[] <- 0.2
    dim(p) <- 5
    dim(y) <- 5
    y[] <- rmultinom(p, 5)
  }),
  "Function 'rmultinom' requires array as argument 2",
  class = "odin_error")
})


test_that("in place expressions must be simple", {
  expect_error(
    odin_parse({
      update(x) <- 1
      initial(x) <- 1
      y <- rmultinom(5 + 2, x)
    }),
    "At present, inplace function 'rmultinom' must use no functions",
    class = "odin_error")
})


test_that("in place expressions must return an array", {
  expect_error(
    odin_parse({
      update(x) <- 1
      initial(x) <- 1
      y <- rmultinom(2, x)
    }),
    "Expected an array on the lhs of inplace function 'rmultinom'",
    class = "odin_error")
})