context('Clearing from memory')

test_that('running clear() with default parameters removes everything except config', {

  test_project <- tempfile('test_project')
  suppressMessages(create.project(test_project))
  on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

  oldwd <- setwd(test_project)
  on.exit(setwd(oldwd), add = TRUE)

  suppressMessages(load.project())

  # default objects are config helper.function project.info
  # Because sticky_cvariables is not set, the config variable should be wiped also
  # Using a regular expression as sometimes the list of cleared variables differs (notably .Random.seed)
  expect_message(clear(), "clear from memory:.*?config.*?helper\\.function.*project.info.*")

  # check they don't exist
  expect_true(!exists(c("project.info"), envir = .TargetEnv))
  expect_true(!exists(c("helper.function"), envir = .TargetEnv))

  # check config does not exist
  expect_true(!exists("config", envir = .TargetEnv))

  tidy_up()
})


test_that('running clear(keep=helper.function) removes everything except the helper.function', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        suppressMessages(load.project())

        # default objects are config helper.function project.info
        expect_message(clear(keep="helper.function"), "not cleared: helper.function")

        # check the others don't exist
        expect_true(!exists("project.info", envir = .TargetEnv))

        # check that config also does not exist
        expect_true(!exists("config", envir = .TargetEnv))

        tidy_up()
})

test_that('running clear() removes everything except the config$sticky_variables', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        # Read the config and set config$sticky_variables
        cfg <- .read.config()
        cfg$sticky_variables <- "helper.function"
        .save.config(cfg)

        suppressMessages(load.project())


        # default objects are config helper.function  project.info
        expect_message(clear(), "not cleared: config helper.function")

        # check the others don't exist
        expect_true(!exists("project.info", envir = .TargetEnv))

        # check that config and helper.function does exist
        expect_true(exists(c("config"), envir = .TargetEnv))
        expect_true(exists(c("helper.function"), envir = .TargetEnv))

        tidy_up()
})

test_that('running clear(force=TRUE) removes everything including the config$sticky_variables', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        # Read the config and set config$sticky_variables
        config <- .read.config()
        config$sticky_variables <- "helper.function"
        .save.config(config)

        suppressMessages(load.project())


        # default objects are config helper.function  project.info
        expect_message(clear(force=TRUE), "clear from memory: config helper.function project.info")

        # check they don't exist
        expect_true(!exists(c("project.info"), envir = .TargetEnv))
        expect_true(!exists(c("config"), envir = .TargetEnv))
        expect_true(!exists(c("helper.function"), envir = .TargetEnv))

        tidy_up()
})

test_that('running in a project template directory loads the latest config.dcf', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        # Read the config and set config$sticky_variables
        config <- .read.config()
        config$sticky_variables <- "xxx"
        .save.config(config)

        # set the sticky variable
        assign("xxx", 1, envir = .TargetEnv)

        # set another variable
        assign("yyy", 2, envir = .TargetEnv)

        # check xxx is not cleared
        expect_message(clear(), "not cleared: config xxx")

        # check xxx is still exists
        expect_true(exists("xxx", envir = .TargetEnv))

        # check the others don't exist
        expect_true(!exists("yyy", envir = .TargetEnv))

        # check that config  exists
        expect_true(exists("config", envir = .TargetEnv))

        tidy_up()
})

test_that('running clear() with variables that dont exist fail cleanly', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        # nothing in memory
        expect_message(clear("xxx"), "No objects to clear")

        # Read the config and set config$sticky_variables
        config <- .read.config()
        config$sticky_variables <- "xxx"
        .save.config(config)

        # should still be nothing, even though it's defined in config$sticky_variables
        expect_message(clear("xxx"), "No objects to clear")

        tidy_up()
})

test_that('running clear() with an object not in memory fails cleanly', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        # Try to delete an item that doesn't exist

        expect_message(clear("yyyy"), "objects not in memory: yyyy")

        tidy_up()
})

test_that('running clear() removes variables beginning with a dot (except the config$sticky_variables)', {

        test_project <- tempfile('test_project')
        suppressMessages(create.project(test_project))
        on.exit(unlink(test_project, recursive = TRUE), add = TRUE)

        oldwd <- setwd(test_project)
        on.exit(setwd(oldwd), add = TRUE)

        # Set some global variables beginning with a dot
        assign(".xxx", 10, envir = .TargetEnv)
        assign(".yyy", 20, envir = .TargetEnv)

        # Read the config and set config$sticky_variables
        cfg <- .read.config()
        cfg$sticky_variables <- ".xxx"
        .save.config(cfg)

        suppressMessages(load.project())


        # should keep .xxx
        expect_message(clear(), "not cleared: config .xxx")
        expect_true(exists(".xxx"))
        expect_equal(get(".xxx", envir = .TargetEnv), 10)

        # should be no .yyy
        expect_true(!exists(".yyy"))

        expect_message(clear(force=TRUE), "clear from memory: .xxx")

        # should be no .xxx
        expect_true(!exists(".xxx"))


        tidy_up()
})