test_that("addEta named parameter", {
  model <- readModelDb("PK_1cmt")

  suppressMessages(modelUpdate <- addEta(model, eta = "lka"))

  # initial conditions are added
  expect_equal(
    functionBody(
      modelUpdate
    )[[3]][[2]][[10]],
    str2lang("etaLka ~ 0.1"))

  # eta is added
  expect_equal(
    functionBody(
      modelUpdate
    )[[4]][[2]][[2]],
    str2lang("ka <- exp(lka + etaLka)"))

  if (requireNamespace("withr", quietly = TRUE)) {

    withr::with_options(list(nlmixr2lib.etaCombineType="snake"), {
      suppressMessages(modelUpdate <- addEta(model, eta = "lka"))
      expect_equal(
        functionBody(
          modelUpdate
        )[[3]][[2]][[10]],
        str2lang("eta_lka ~ 0.1"))
      # eta is added
      expect_equal(
        functionBody(
          modelUpdate
        )[[4]][[2]][[2]],
        str2lang("ka <- exp(lka + eta_lka)"))
    })

    withr::with_options(list(nlmixr2lib.etaCombineType="dot"), {
      suppressMessages(modelUpdate <- addEta(model, eta = "lka"))
      expect_equal(
        functionBody(
          modelUpdate
        )[[3]][[2]][[10]],
        str2lang("eta.lka ~ 0.1"))
      # eta is added
      expect_equal(
        functionBody(
          modelUpdate
        )[[4]][[2]][[2]],
        str2lang("ka <- exp(lka + eta.lka)"))
    })


    withr::with_options(list(nlmixr2lib.etaCombineType="blank"), {
      suppressMessages(modelUpdate <- addEta(model, eta = "lka"))
      expect_equal(
        functionBody(
          modelUpdate
        )[[3]][[2]][[10]],
        str2lang("etalka ~ 0.1"))
      # eta is added
      expect_equal(
        functionBody(
          modelUpdate
        )[[4]][[2]][[2]],
        str2lang("ka <- exp(lka + etalka)"))
    })

    withr::with_options(list(nlmixr2lib.etaCombineType="camel"), {
      suppressMessages(modelUpdate <- addEta(model, eta = "lka"))
      expect_equal(
        functionBody(
          modelUpdate
        )[[3]][[2]][[10]],
        str2lang("etaLka ~ 0.1"))
      # eta is added
      expect_equal(
        functionBody(
          modelUpdate
        )[[4]][[2]][[2]],
        str2lang("ka <- exp(lka + etaLka)"))
    })

    withr::with_options(list(nlmixr2lib.etaCombineType=4), {
      expect_equal(
        functionBody(
          modelUpdate
        )[[3]][[2]][[10]],
        str2lang("etaLka ~ 0.1"))
      # eta is added
      expect_equal(
        functionBody(
          modelUpdate
        )[[4]][[2]][[2]],
        str2lang("ka <- exp(lka + etaLka)"))
    })
  }

})

test_that("addEta mu-ref parameter", {
  model <- readModelDb("PK_1cmt")
  suppressMessages(modelUpdate <- addEta(model, eta = "ka"))
  # initial conditions are added
  expect_equal(
    functionBody(
      modelUpdate
    )[[3]][[2]][[10]],
    str2lang("etaKa ~ 0.1")
  )
  # eta is added
  expect_equal(
    functionBody(
      modelUpdate
    )[[4]][[2]][[2]],
    str2lang("ka <- exp(lka + etaKa)")
  )
})

test_that("addEta multiple parameter, mu-ref and not", {
  model <- readModelDb("PK_1cmt")
  suppressMessages(modelUpdate <- addEta(model, eta = c("lvc", "ka")))
  # initial conditions are added
  expect_equal(
    functionBody(
      modelUpdate
    )[[3]][[2]][[10]],
    str2lang("etaLvc ~ 0.1")
  )
  expect_equal(
    functionBody(
      modelUpdate
    )[[3]][[2]][[11]],
    str2lang("etaKa ~ 0.1")
  )
  # eta is added
  expect_equal(
    functionBody(
      modelUpdate
    )[[4]][[2]][[2]],
    str2lang("ka <- exp(lka + etaKa)")
  )
  expect_equal(
    functionBody(
      modelUpdate
    )[[4]][[2]][[4]],
    str2lang("vc <- exp(lvc + etaLvc)")
  )
})

test_that("addEta named parameter", {
  model <- readModelDb("PK_1cmt")
  suppressMessages(modelUpdate <- addEta(model, eta = "lka"))
  # initial conditions are added
  expect_equal(
    functionBody(
      modelUpdate
    )[[3]][[2]][[10]],
    str2lang("etaLka ~ 0.1")
  )
  # eta is added
  expect_equal(
    functionBody(
      modelUpdate
    )[[4]][[2]][[2]],
    str2lang("ka <- exp(lka + etaLka)")
  )
})

test_that("addEta non-existent parameter", {
  model <- readModelDb("PK_1cmt")
  suppressMessages(expect_error(
    addEta(model, eta = "foo")
  ))
})


test_that("compiled ui object", {
  model <- readModelDb("PK_1cmt")
  model <- rxode2::rxode2(model)
  expect_true(inherits(model, "rxUi"))
  suppressMessages(modelUpdate <- addEta(model, eta = "lka"))
  expect_true(inherits(modelUpdate, "rxUi"))
})

test_that("addEta() correctly adds IIV when there is a covariate (#27)", {

  model <- function() {
    ini({
      lka <- 0.45
      lcl <- 1
      lvc <- 3.45
      propSd <- c(0, 0.5)
      allo_cl <- 0.75
    })
    model({
      ka <- exp(lka)
      cl <- exp(lcl + allo_cl * WT)
      vc <- exp(lvc)
      cp <- linCmt()
      cp ~ prop(propSd)
    })
  }
  # Update the model detecting the correct parameter for cl
  suppressMessages(
    newEtaRemap <- addEta(model, "cl", priorName=FALSE)
  )
  # Update the model where the correct parameter cor cl is given
  suppressMessages(
    newEta <- addEta(model, "lcl", priorName=FALSE)
  )
  expect_equal(newEtaRemap, newEta, ignore_function_env = TRUE)

})