test_that("issues within the cache are reported", {
  skip_on_cran()

  # use a temporary cache for this test as we're going
  # to mutate and invalidate it
  tempcache <- renv_scope_tempfile("renv-tempcache-")
  ensure_directory(tempcache)
  renv_scope_envvars(RENV_PATHS_CACHE = tempcache)

  # initialize project
  renv_tests_scope("breakfast")
  init()

  # find packages in the cache
  cache <- renv_cache_list()

  # diagnostics for missing DESCRIPTION
  bread <- renv_cache_list(packages = "bread")
  descpath <- file.path(bread, "DESCRIPTION")
  unlink(descpath)
  if (length(descpath) > 1L) {
    writeLines(descpath)
    stop("unexpected descpath")
  }


  # diagnostics for bad hash
  breakfast <- renv_cache_list(packages = "breakfast")
  descpath <- file.path(breakfast, "DESCRIPTION")
  if (length(descpath) > 1L) {
    writeLines(descpath)
    stop("unexpected descpath")
  }

  desc <- renv_description_read(descpath)
  desc$Version <- "2.0.0"
  renv_dcf_write(desc, file = descpath)

  # check problems explicitly
  problems <- renv_cache_diagnose(verbose = FALSE)
  expect_true(nrow(problems) == 2)

})

test_that("use.cache project setting is honored", {
  skip_on_os("windows")

  renv_tests_scope("breakfast")

  init()

  packages <- list.files(renv_paths_library(), full.names = TRUE)
  types <- renv_file_type(packages)
  expect_true(all(types == "symlink"))

  settings$use.cache(FALSE)

  packages <- list.files(renv_paths_library(), full.names = TRUE)
  types <- renv_file_type(packages)
  expect_true(all(types == "directory"))

  settings$use.cache(TRUE)

  packages <- list.files(renv_paths_library(), full.names = TRUE)
  types <- renv_file_type(packages)
  expect_true(all(types == "symlink"))

})

test_that("package installation does not fail with non-writable cache", {
  skip_on_os("windows")

  renv_tests_scope()

  cache <- renv_scope_tempfile("renv-cache-")
  dir.create(cache, mode = "0555")
  renv_scope_envvars(RENV_PATHS_CACHE = cache)

  init()
  records <- install("bread")
  expect_true(records$bread$Package == "bread")

  location <- find.package("bread")
  type <- renv_file_type(location)
  expect_false(type == "symlink")

})

test_that("the cache is used even if RENV_PATHS_LIBRARY is non-canonical", {
  skip_on_os("windows")

  libpath <- renv_scope_tempfile("renv-library")
  ensure_directory(libpath)
  renv_scope_envvars(RENV_PATHS_LIBRARY = file.path(libpath, "."))

  renv_tests_scope("bread")
  init()
  remove("bread")
  restore()

  bread <- system.file(package = "bread")
  expect_true(renv_file_type(bread) == "symlink")

})

test_that("malformed folders in the cache are ignored", {
  skip_on_cran()
  renv_tests_scope()

  cachepath <- renv_scope_tempfile("renv-cache-")
  renv_scope_envvars(RENV_PATHS_CACHE = cachepath)

  badpath <- renv_paths_cache("a-b/c-d/e-f/g-h/i-j")
  dir.create(dirname(badpath), recursive = TRUE)
  file.create(badpath)

  paths <- list.files(renv_paths_cache(), recursive = TRUE)
  expect_length(paths, 1)

  paths <- renv_cache_list()
  expect_length(paths, 0)

})

test_that("corrupt Meta/package.rds is detected", {
  skip_on_cran()
  renv_tests_scope()

  cachepath <- renv_scope_tempfile("renv-cache-")
  renv_scope_envvars(RENV_PATHS_CACHE = cachepath)

  init()
  install("bread")

  path <- renv_cache_find(list(Package = "bread", Version = "1.0.0"))
  expect_true(nzchar(path) && file.exists(path))

  metapath <- file.path(path, "Meta/package.rds")
  expect_true(file.exists(metapath))

  writeLines("whoops!", con = file.path(path, "Meta/package.rds"))

  diagnostics <- renv_cache_diagnose(verbose = FALSE)

  expect_true(is.data.frame(diagnostics))
  expect_true(nrow(diagnostics) == 1)
  expect_true(diagnostics$Package == "bread")
  expect_true(diagnostics$Version == "1.0.0")

})

test_that("invalid Built field is detected", {

  skip_on_cran()
  renv_tests_scope()

  cachepath <- renv_scope_tempfile("renv-cache-")
  renv_scope_envvars(RENV_PATHS_CACHE = cachepath)

  init()
  install("bread")

  path <- renv_cache_find(list(Package = "bread", Version = "1.0.0"))
  expect_true(nzchar(path) && file.exists(path))

  descpath <- file.path(path, "DESCRIPTION")
  contents <- readLines(descpath)

  old <- paste("R", getRversion())
  new <- paste("R 1.0.0")
  replaced <- gsub(old, new, contents)
  writeLines(replaced, con = descpath)

  diagnostics <- renv_cache_diagnose(verbose = FALSE)

  expect_true(is.data.frame(diagnostics))
  expect_true(nrow(diagnostics) == 1)
  expect_true(diagnostics$Package == "bread")
  expect_true(diagnostics$Version == "1.0.0")

})

test_that("ACLs set on packages in project library are reset", {

  skip_on_cran()
  skip_if(!renv_platform_linux())

  # use a custom tracer to set ACLs on a package after it's been installed
  trace("renv_install_package_impl", exit = quote({
    system(paste("setfacl -m g::-", renv_shell_path(installpath)))
  }), where = renv_envir_self(), print = FALSE)

  defer(untrace("renv_install_package_impl", where = renv_envir_self()))

  # use a custom cache
  cachedir <- renv_scope_tempfile("renv-cache-")
  ensure_directory(cachedir)
  renv_scope_envvars(RENV_PATHS_CACHE = cachedir)

  # initialize project with bread; don't try to reset ACLs
  local({

    renv_scope_envvars(RENV_CACHE_ACLS = "FALSE")
    renv_tests_scope("bread")
    init()

    # check that the ACLs were not reset
    pkgpath <- find.package("bread")
    mode <- file.mode(pkgpath)
    expect_false(file.mode(pkgpath) == file.mode(dirname(pkgpath)))
  })

  # try again, but reset ACLs this time
  local({

    renv_scope_envvars(RENV_CACHE_ACLS = "TRUE")
    renv_tests_scope("toast")
    init()

    # check that the ACLs were reset this time
    pkgpath <- find.package("toast")
    mode <- file.mode(pkgpath)
    expect_true(file.mode(pkgpath) == file.mode(dirname(pkgpath)))

  })

})

# test_that("multiple cache directories are used", {
#   skip_on_cran()
#   skip_on_os("windows") # setting folder permissions is a bit more complex on windows
#
#   chmod <- function(path, mode = c("read", "read+write")) {
#     mode <- match.arg(mode)
#     path <- normalizePath(path)
#     stopifnot(file.exists(path))
#     # '5' (read and execute) is the minimum permission that will work.
#     # With '4' (read only) things like dir() don't work anymore.
#     numbers <- if (mode == "read") "555" else "777"
#     system(sprintf("chmod %s %s", numbers, path))
#   }
#
#   # use multiple temporary caches for this test
#   tempcache1 <- tempfile("renv-tempcache-")
#   ensure_directory(tempcache1)
#   tempcache2 <- tempfile("renv-tempcache-")
#   ensure_directory(tempcache2)
#
#   defer({
#     unlink(tempcache1, recursive = TRUE)
#     unlink(tempcache2, recursive = TRUE)
#   })
#
#   # add both packages to the cache
#   renv_scope_envvars(RENV_PATHS_CACHE = paste(tempcache1, tempcache2, sep = ";"))
#
#   # initialize project
#   renv_tests_scope()
#   init()
#
#   # there should be two paths in the cache
#   expect_length(paths$cache(), 2L)
#
#   # install bread to first cache path
#   install("bread")
#
#   # test that there is one package (bread) and it is installed in the first cache
#   cache <- renv_cache_list()
#   expect_length(cache, 1L)
#   expect_true(startsWith(cache[basename(cache) == "bread"], tempcache1))
#
#   # make the first cache read only
#   chmod(paths$cache()[1L], "read")
#
#   # install oatmeal to second cache path
#   install("oatmeal")
#
#   # test that there are 2 packages and the latest package (oatmeal) is installed in the second cache
#   cache <- renv_cache_list()
#   expect_length(cache, 2L)
#   expect_true(startsWith(cache[basename(cache) == "oatmeal"], tempcache2))
#
#   # make the first cache read+write again, should now install into the first cache again
#   chmod(paths$cache()[1L], "read+write")
#
#   install("toast")
#
#   # test that there are 3 packages and the latest package (toast) is installed in the first cache
#   cache <- renv_cache_list()
#   expect_length(cache, 3L)
#   expect_true(startsWith(cache[basename(cache) == "toast"], tempcache1))
#
# })