# mainly regression tests against old version of BCEA::evppi()
# from version <= 2.4.5
# versus new evppi() calling voi::evppi internally


# library(BCEA)
if (interactive()) library(testthat)

if (!requireNamespace("voi", quietly = TRUE)) {
  stop(
    "Package \"voi (>= 1.0.1)\" must be installed to use this function.",
    call. = FALSE
  )
}

test_that("GAM regression (default) with vaccine data", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # expect_length(inp, 2)
  # expect_named(inp, c("mat", "parameters"))
  # expect_type(inp, "list")
  
  # EVPPI <- BCEA::evppi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat)
  # save(EVPPI, file = "tests/testthat/testdata/EVPPI_GAM_default.RData")
  load(file = test_path("testdata", "EVPPI_GAM_default.RData"))
  
  EVPPI_voi <- evppi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat)
  
  EVPPI_voi_orig <- voi::evppi(bcea_vacc[c("e","c","k")],
                               inputs = inp$mat,
                               pars = c("beta.1.", "beta.2."),
                               check = TRUE)
  
  expect_s3_class(EVPPI, "evppi")
  expect_length(EVPPI, 10)
  expect_type(EVPPI, "list")
  
  expect_s3_class(EVPPI_voi, "evppi")
  expect_type(EVPPI_voi, "list")
  
  expect_equivalent(EVPPI$evppi, EVPPI_voi$evppi, tolerance = 0.001)
  expect_equivalent(EVPPI_voi_orig$evppi, EVPPI_voi$evppi, tolerance = 0.001)
  
  expect_equivalent(EVPPI$k, EVPPI_voi$k, tolerance = 0.001)
  expect_equivalent(EVPPI_voi_orig$k, EVPPI_voi$k, tolerance = 0.001)
  
  expect_equivalent(EVPPI$evi, EVPPI_voi$evi, tolerance = 0.001)
  expect_equivalent(EVPPI$index, EVPPI_voi$index)
  expect_equivalent(EVPPI$fitted.costs, EVPPI_voi$fitted.costs, tolerance = 0.001)
  expect_equivalent(EVPPI$fitted.effects, EVPPI_voi$fitted.effects, tolerance = 0.001)
  expect_equivalent(EVPPI$select, EVPPI_voi$select)
  
  ##TODO: snapshot
  # plot(EVPPI)
  # plot(EVPPI_voi)
  
  rm(EVPPI)
})

test_that("Strong & Oakley with vaccine data", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  expect_error(evppi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat, method = "so", n.blocks = 50),
               regexp = "only works for single-parameter EVPPI")
  
  # EVPPI.so <- BCEA::evppi(bcea_vacc, "beta.1.", inp$mat, method = "so", n.blocks = 50)
  # save(EVPPI.so, file = "tests/testthat/testdata/EVPPI_so_default.RData")
  load(file = test_path("testdata", "EVPPI_so_default.RData"))
  
  EVPPI.so_voi <- evppi(bcea_vacc, "beta.1.", inp$mat, method = "so", n.blocks = 50)
  
  expect_s3_class(EVPPI.so, "evppi")
  expect_length(EVPPI.so, 6)
  expect_type(EVPPI.so, "list")
  
  expect_s3_class(EVPPI.so_voi, "evppi")
  expect_type(EVPPI.so_voi, "list")
  
  expect_equivalent(EVPPI.so$evppi, EVPPI.so_voi$evppi, tolerance = 0.001)
  expect_equivalent(EVPPI.so$k, EVPPI.so_voi$k, tolerance = 0.001)
  expect_equivalent(EVPPI.so$evi, EVPPI.so_voi$evi, tolerance = 0.001)
  expect_equivalent(EVPPI.so$index, EVPPI.so_voi$index)
  
  rm(EVPPI.so)
})

test_that("Sadatsafavi et al with vaccine data", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # voi::evppi only works for single-parameter EVPPI
  
  # EVPPI.sad <- BCEA::evppi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat, method = "sad", n.seps = 1)
  # save(EVPPI.sad, file = "tests/testthat/testdata/EVPPI_sad_default.RData")
  # load(file = test_path("testdata", "EVPPI_sad_default.RData"))
  
  # TODO: error
  # EVPPI.sal <- BCEA::evppi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat, method = "sal", n.seps = 1)
  
  expect_error(evppi(bcea_vacc, param_idx = c("beta.1.", "beta.2."), inp$mat, method = "sal", n.seps = 1),
               regexp = "only works for single-parameter EVPPI")
  
  # voiEVPPI.sad <- voi::evppi(outputs = bcea_vacc[c("e","c","k")], inputs = inp$mat,
  #                            pars = c("beta.1.", "beta.2."), method = "sal", n.seps = 1)
  
  # EVPPI.sad <- BCEA::evppi(bcea_vacc, "beta.2.", inp$mat, method = "sad", n.seps = 1)
  # save(EVPPI.sad, file = "tests/testthat/testdata/EVPPI_sad_default.RData")
  load(file = test_path("testdata", "EVPPI_sad_default.RData"))
  
  EVPPI.sad_voi <- evppi(bcea_vacc, "beta.2.", inp$mat, method = "sad", n.seps = 1)
  EVPPI.sal_voi <- evppi(bcea_vacc, "beta.1.", inp$mat, method = "sal", n.seps = 1)
  
  expect_s3_class(EVPPI.sad, "evppi")
  expect_length(EVPPI.sad, 6)
  expect_type(EVPPI.sad, "list")
  
  expect_s3_class(EVPPI.sad_voi, "evppi")
  expect_type(EVPPI.sad_voi, "list")
  
  expect_equivalent(EVPPI.sad$evppi, EVPPI.sad_voi$evppi, tolerance = 0.001)
  expect_equivalent(EVPPI.sad$k, EVPPI.sad_voi$k, tolerance = 0.001)
  expect_equivalent(EVPPI.sad$evi, EVPPI.sad_voi$evi, tolerance = 0.001)
  expect_equivalent(EVPPI.sad$index, EVPPI.sad_voi$index)
  
  ##TODO: snapshot
  # plot(EVPPI.so)
  # plot(EVPPI.sad)
  # plot(EVPPI.so_voi)
  # plot(EVPPI.sad_voi)
  
  rm(EVPPI.sad)
})

test_that("Select parameters by position with vaccine data", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # evppi_idx <- BCEA::evppi(he = bcea_vacc, param_idx = 39:40, input = inp$mat)
  # save(evppi_idx, file = "tests/testthat/testdata/EVPPI_idx.RData")
  load(file = test_path("testdata", "EVPPI_idx.RData"))
  
  evppi_idx_voi <- evppi(he = bcea_vacc, param_idx = 39:40, input = inp$mat)
  
  expect_s3_class(evppi_idx, "evppi")
  expect_length(evppi_idx, 10)
  expect_type(evppi_idx, "list")
  
  expect_s3_class(evppi_idx_voi, "evppi")
  expect_type(evppi_idx_voi, "list")
})

test_that("INLA/SPDE with vaccine data", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  skip_if_not_installed("INLA")
  skip("INLA is crashing")
  
  if (require("INLA")) {
    # EVPPI_inla <- BCEA::evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "inla")
    # save(EVPPI_inla, file = "tests/testthat/testdata/EVPPI_inla_default.RData")
    load(file = test_path("testdata", "EVPPI_inla_default.RData"))
    
    EVPPI_inla_voi <- evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "inla")
    
    expect_s3_class(EVPPI_inla, "evppi")
    expect_length(EVPPI_inla, 10)
    expect_type(EVPPI_inla, "list")
    
    expect_s3_class(EVPPI_inla_voi, "evppi")
    expect_type(EVPPI_inla_voi, "list")
  }
})

test_that("Different argument formats with vaccine data", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # GAM regression
  # EVPPI_gam <- BCEA::evppi(he = bcea_vacc, param_idx = 39:40, input = inp$mat, method = "GAM")
  # save(EVPPI_gam, file = "tests/testthat/testdata/EVPPI_gam.RData")
  load(file = test_path("testdata", "EVPPI_gam.RData"))
  
  # lower case method name
  EVPPI_gam_voi <- evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "gam")
  
  expect_s3_class(EVPPI_gam_voi, "evppi")
  expect_type(EVPPI_gam_voi, "list")
  expect_equivalent(EVPPI_gam$k, EVPPI_gam_voi$k, tolerance = 0.001)
  expect_equivalent(EVPPI_gam$select, EVPPI_gam_voi$select)
  
  # Strong et al GP regression
  
  # EVPPI_gp <- BCEA::evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "GP")
  # save(EVPPI_gp, file = "tests/testthat/testdata/EVPPI_gp.RData")
  load(file = test_path("testdata", "EVPPI_gp.RData"))
  
  # lower case method name
  EVPPI_gp_voi <- evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "gp")
  
  expect_s3_class(EVPPI_gp_voi, "evppi")
  expect_type(EVPPI_gp_voi, "list")
  
  # subsetting input PSA simulations
  
  # set.seed(1234)
  # EVPPI_psa <- BCEA::evppi(bcea_vacc, c("beta.1." , "beta.2."), inp$mat, N = 100)
  # save(EVPPI_psa, file = "tests/testthat/testdata/EVPPI_psa.RData")
  load(file = test_path("testdata", "EVPPI_psa.RData"))
  
  set.seed(1234)
  EVPPI_psa_voi <- evppi(bcea_vacc, c("beta.1." , "beta.2."), inp$mat, N = 100)
  
  expect_equivalent(EVPPI_psa$select, EVPPI_psa_voi$select)
  expect_equivalent(EVPPI_psa$evppi, EVPPI_psa_voi$evppi, tolerance = 0.001)
  
  expect_equivalent(EVPPI_psa$k, EVPPI_psa_voi$k, tolerance = 0.001)
  expect_equivalent(EVPPI_psa$evi, EVPPI_psa_voi$evi, tolerance = 0.001)
  expect_equivalent(EVPPI_psa$index, EVPPI_psa_voi$index)
})

test_that("Mesh plotting with vaccine data", {
  
  skip("plot = TRUE mesh plot to be snapshot")
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # # GAM regression (default)
  # # plot not produced
  # EVPPI <- BCEA::evppi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat, plot = TRUE)
  # EVPPI_voi <- evppi_voi(bcea_vacc, c("beta.1.", "beta.2."), inp$mat, plot = TRUE)
  # EVPPI_voi_orig <- voi::evppi(bcea_vacc[c("e","c","k")], inputs = inp$mat, pars = c("beta.1.", "beta.2."), check = TRUE, plot_inla_mesh = TRUE)
  # 
  # # INLA
  # EVPPI_inla <- BCEA::evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "inla", plot = TRUE)
  # EVPPI_inla_voi <- evppi_voi(he = bcea_vacc, 39:40, input = inp$mat, method = "inla", plot = TRUE)
})

test_that("Fitted values with vaccine data two parameters", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # GP
  # set.seed(1234)
  # EVPPI_gp_residuals <-
  #   BCEA::evppi(
  #     he = bcea_vacc,
  #     param_idx = 39:40,
  #     input = inp$mat,
  #     method = "gp",
  #     residuals = TRUE)
  # save(EVPPI_gp_residuals, file = "tests/testthat/testdata/EVPPI_gp_residuals.RData")
  load(file = test_path("testdata", "EVPPI_gp_residuals.RData"))
  
  set.seed(1234)
  EVPPI_gp_voi_residuals <-
    evppi(
      he = bcea_vacc,
      param_idx = 39:40,
      input = inp$mat,
      method = "gp",
      residuals = TRUE)
  
  expect_equivalent(
    EVPPI_gp_residuals$select,
    EVPPI_gp_voi_residuals$select)
  
  expect_equivalent(
    EVPPI_gp_residuals$fitted.costs,
    EVPPI_gp_voi_residuals$fitted.costs,
    tolerance = 0.1)
  
  expect_equivalent(
    EVPPI_gp_residuals$fitted.effects,
    EVPPI_gp_voi_residuals$fitted.effects,
    tolerance = 0.1)
  
  # SAD
  # set.seed(1234)
  # EVPPI_sad_residuals <-
  #   BCEA::evppi(
  #     he = bcea_vacc,
  #     param_idx = "beta.2.",
  #     input = inp$mat,
  #     method = "sad",
  #     residuals = TRUE)
  # save(EVPPI_sad_residuals, file = "tests/testthat/testdata/EVPPI_sad_residuals.RData")
  load(file = test_path("testdata", "EVPPI_sad_residuals.RData"))
  
  set.seed(1234)
  EVPPI_sad_voi_residuals <-
    evppi(
      he = bcea_vacc,
      param_idx = "beta.2.",
      input = inp$mat,
      method = "sad",
      residuals = TRUE)
  
  # no fitted values returned
  expect_null(EVPPI_sad_residuals$fitted.costs)
  expect_null(EVPPI_sad_residuals$fitted.effects)
  
  expect_null(EVPPI_sad_voi_residuals$fitted.costs)
  expect_null(EVPPI_sad_voi_residuals$fitted.effects)
  
  # GAM
  # set.seed(1234)
  # EVPPI_gam_residuals <-
  #   BCEA::evppi(
  #     he = bcea_vacc,
  #     param_idx = 39:40,
  #     input = inp$mat,
  #     method = "gam",
  #     residuals = TRUE)
  # save(EVPPI_gam_residuals, file = "tests/testthat/testdata/EVPPI_gam_residuals.RData")
  load(file = test_path("testdata", "EVPPI_gam_residuals.RData"))
  
  set.seed(1234)
  EVPPI_gam_voi_residuals <-
    evppi(
      he = bcea_vacc,
      param_idx = 39:40,
      input = inp$mat,
      method = "gam",
      residuals = TRUE)
  
  expect_equivalent(
    EVPPI_gam_residuals$fitted.costs,
    EVPPI_gam_voi_residuals$fitted.costs,
    tolerance = 0.001)
  
  expect_equivalent(
    EVPPI_gam_residuals$fitted.effects,
    EVPPI_gam_voi_residuals$fitted.effects,
    tolerance = 0.001)
  
  skip_if_not_installed("INLA")
  skip("INLA is crashing")
  
  if (require("INLA")) {
    # set.seed(1234)
    # EVPPI_inla_residuals <- BCEA::evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "inla", residuals = TRUE)
    # save(EVPPI_inla_residuals, file = "tests/testthat/testdata/EVPPI_inla_residuals.RData")
    load(file = test_path("testdata", "EVPPI_inla_residuals.RData"))
    
    set.seed(1234)
    EVPPI_inla_voi_residuals <- evppi(he = bcea_vacc, 39:40, input = inp$mat, method = "inla", residuals = TRUE)
    
    expect_equivalent(
      EVPPI_inla_residuals$select,
      EVPPI_inla_voi_residuals$select)
    
    expect_equivalent(
      EVPPI_inla_residuals$fitted.costs,
      EVPPI_inla_voi_residuals$fitted.costs,
      tolerance = 0.1)
    
    expect_equivalent(
      EVPPI_inla_residuals$fitted.effects,
      EVPPI_inla_voi_residuals$fitted.effects,
      tolerance = 0.1)
  }
})

test_that("Fitted values with vaccine data three parameters", {
  
  data(Vaccine, package = "BCEA")
  treats <- c("Status quo", "Vaccination")
  
  # Run the health economic evaluation using BCEA
  bcea_vacc <- bcea(e.pts, c.pts, ref = 2, interventions = treats)
  
  inp <- createInputs(vaccine_mat, print_is_linear_comb = FALSE)
  
  # GP
  # set.seed(1234)
  # EVPPI_gp_3_residuals <-
  #   BCEA::evppi(
  #     he = bcea_vacc,
  #     param_idx = 39:41,
  #     input = inp$mat,
  #     method = "gp",
  #     residuals = TRUE)
  # save(EVPPI_gp_3_residuals, file = "tests/testthat/testdata/EVPPI_gp_3_residuals.RData")
  load(file = test_path("testdata", "EVPPI_gp_3_residuals.RData"))
  
  set.seed(1234)
  EVPPI_gp_voi_residuals <-
    evppi(
      he = bcea_vacc,
      param_idx = 39:41,
      input = inp$mat,
      method = "gp",
      residuals = TRUE)
  
  expect_equivalent(
    EVPPI_gp_3_residuals$fitted.costs,
    EVPPI_gp_voi_residuals$fitted.costs,
    tolerance = 0.1)
  
  expect_equivalent(
    EVPPI_gp_3_residuals$fitted.effects,
    EVPPI_gp_voi_residuals$fitted.effects,
    tolerance = 0.1)
  
  # GAM
  # set.seed(1234)
  # EVPPI_gam_3_residuals <-
  #   BCEA::evppi(
  #     he = bcea_vacc,
  #     param_idx = 39:41,
  #     input = inp$mat,
  #     method = "gam",
  #     residuals = TRUE)
  # save(EVPPI_gam_3_residuals, file = "tests/testthat/testdata/EVPPI_gam_3_residuals.RData")
  load(file = test_path("testdata", "EVPPI_gam_3_residuals.RData"))
  
  set.seed(1234)
  EVPPI_gam_voi_residuals <-
    evppi(
      he = bcea_vacc,
      param_idx = 39:41,
      input = inp$mat,
      method = "gam",
      residuals = TRUE)
  
  expect_equivalent(
    EVPPI_gam_3_residuals$fitted.costs,
    EVPPI_gam_voi_residuals$fitted.costs,
    tolerance = 0.1)
  
  expect_equivalent(
    EVPPI_gam_3_residuals$fitted.effects,
    EVPPI_gam_voi_residuals$fitted.effects,
    tolerance = 0.1)
  
  skip_if_not_installed("INLA")
  skip("INLA is crashing")
  
  if (require("INLA")) {
    # set.seed(1234)
    # EVPPI_inla_3_residuals <-
    #   BCEA::evppi(
    #     he = bcea_vacc,
    #     param_idx = 39:41,
    #     input = inp$mat,
    #     method = "inla",
    #     residuals = TRUE)
    # save(EVPPI_inla_3_residuals, file = "tests/testthat/testdata/EVPPI_inla_3_residuals.RData")
    load(file = test_path("testdata", "EVPPI_inla_3_residuals.RData"))
    
    set.seed(1234)
    EVPPI_inla_voi_residuals <-
      evppi(
        he = bcea_vacc,
        param_idx = 39:41,
        input = inp$mat,
        method = "inla",
        residuals = TRUE)
    
    expect_equivalent(
      EVPPI_inla_3_residuals$fitted.costs,
      EVPPI_inla_voi_residuals$fitted.costs,
      tolerance = 0.1)
    
    expect_equivalent(
      EVPPI_inla_3_residuals$fitted.effects,
      EVPPI_inla_voi_residuals$fitted.effects,
      tolerance = 0.1)
  }
})

test_that("More that two interventions with smoking data", {
  
  skip("more than two interventions to be revisited after {voi} update")
  
  data(Smoking, package = "BCEA")
  treats <-
    c("No intervention", "Self-help",
      "Individual counselling", "Group counselling")
  
  inp <- createInputs(smoking_output, print_is_linear_comb = FALSE)
  
  bcea_smoke <- bcea(eff, cost, ref = 4, interventions = treats, Kmax = 500)  # all interventions
  
  # bcea_smoke <- bcea(eff, cost, ref = 4, .comparison = 1, interventions = treats, Kmax = 500)
  # bcea_smoke <- bcea(eff, cost, ref = 4, .comparison = c(2,3), interventions = treats, Kmax = 500)
  
  # expect_length(inp , 2)
  # expect_named(inp, c("mat", "parameters"))
  # expect_type(inp, "list")
  
  set.seed(1234)
  # EVPPI_smoke <- BCEA::evppi(bcea_smoke, param_idx = c(2,3), inp$mat, h.value = 5e-7, method = "gam")
  # save(EVPPI_smoke, file = "tests/testthat/testdata/EVPPI_smoke.RData")
  # load(file = test_path("testdata", "EVPPI_smoke.RData"))
  
  set.seed(1234)
  EVPPI_voi <- evppi(bcea_smoke, param_idx = c(2,3), inp$mat, h.value = 5e-7, method = "gam")
  
  # voiEVPPI <- voi::evppi(bcea_smoke[c("e","c","k")], pars = c("d.3.", "d.4."), inputs = inp$mat, h.value = 5e-7)
  
  expect_s3_class(EVPPI_voi, "evppi")
  expect_type(EVPPI_voi, "list")
  
  ##TODO: error
  expect_equivalent(EVPPI_smoke$evppi, EVPPI_voi$evppi, tolerance = 0.01)
  
  expect_equivalent(EVPPI_smoke$k, EVPPI_voi$k, tolerance = 0.001)
  expect_equivalent(EVPPI_smoke$k, EVPPI_voi$k, tolerance = 0.001)
  
  expect_equivalent(EVPPI_smoke$evi, EVPPI_voi$evi, tolerance = 0.001)
  expect_equivalent(EVPPI_smoke$select, EVPPI_voi$select)
  expect_equivalent(EVPPI_smoke$index, EVPPI_voi$index)
  
  ##TODO: error
  ##TODO: seems like the wrong order of columns?
  ## what is the correct order? label columns?
  expect_equivalent(EVPPI_smoke$fitted.costs, EVPPI_voi$fitted.costs, tolerance = 0.001)
  expect_equivalent(EVPPI_smoke$fitted.effects, EVPPI_voi$fitted.effects, tolerance = 0.001)
  
  # plot(EVPPI_voi)
})