class_name _TestCase
extends Node

signal completed()

# default timeout 5min
const DEFAULT_TIMEOUT := -1
const ARGUMENT_TIMEOUT := "timeout"
const ARGUMENT_SKIP := "do_skip"
const ARGUMENT_SKIP_REASON := "skip_reason"

var _iterations: int = 1
var _current_iteration: int = -1
var _seed: int
var _fuzzers: Array[GdFunctionArgument] = []
var _test_param_index := -1
var _line_number: int = -1
var _script_path: String
var _skipped := false
var _skip_reason := ""
var _expect_to_interupt := false
var _timer: Timer
var _interupted: bool = false
var _failed := false
var _report: GdUnitReport = null
var _parameter_set_resolver: GdUnitTestParameterSetResolver
var _is_disposed := false

var timeout: int = DEFAULT_TIMEOUT:
	set(value):
		timeout = value
	get:
		if timeout == DEFAULT_TIMEOUT:
			timeout = GdUnitSettings.test_timeout()
		return timeout


@warning_ignore("shadowed_variable_base_class")
func configure(p_name: String, p_line_number: int, p_script_path: String, p_timeout: int=DEFAULT_TIMEOUT, p_fuzzers: Array[GdFunctionArgument]=[], p_iterations: int=1, p_seed: int=-1) -> _TestCase:
	set_name(p_name)
	_line_number = p_line_number
	_fuzzers = p_fuzzers
	_iterations = p_iterations
	_seed = p_seed
	_script_path = p_script_path
	timeout = p_timeout
	return self


func execute(p_test_parameter := Array(), p_iteration := 0) -> void:
	_failure_received(false)
	_current_iteration = p_iteration - 1
	if _current_iteration == - 1:
		_set_failure_handler()
		set_timeout()
	if not p_test_parameter.is_empty():
		update_fuzzers(p_test_parameter, p_iteration)
		_execute_test_case(name, p_test_parameter)
	else:
		_execute_test_case(name, [])
	await completed


func execute_paramaterized(p_test_parameter: Array) -> void:
	_failure_received(false)
	set_timeout()
	# We need here to add a empty array to override the `test_parameters` to prevent initial "default" parameters from being used.
	# This prevents objects in the argument list from being unnecessarily re-instantiated.
	var test_parameters := p_test_parameter.duplicate() # is strictly need to duplicate the paramters before extend
	test_parameters.append([])
	_execute_test_case(name, test_parameters)
	await completed


func dispose() -> void:
	if _is_disposed:
		return
	_is_disposed = true
	Engine.remove_meta("GD_TEST_FAILURE")
	stop_timer()
	_remove_failure_handler()
	_fuzzers.clear()
	_report = null


@warning_ignore("shadowed_variable_base_class", "redundant_await")
func _execute_test_case(name: String, test_parameter: Array) -> void:
	# needs at least on await otherwise it breaks the awaiting chain
	await get_parent().callv(name, test_parameter)
	await Engine.get_main_loop().process_frame
	completed.emit()


func update_fuzzers(input_values: Array, iteration: int) -> void:
	for fuzzer :Variant in input_values:
		if fuzzer is Fuzzer:
			fuzzer._iteration_index = iteration + 1


func set_timeout() -> void:
	if is_instance_valid(_timer):
		return
	var time: float = timeout / 1000.0
	_timer = Timer.new()
	add_child(_timer)
	_timer.set_name("gdunit_test_case_timer_%d" % _timer.get_instance_id())
	_timer.timeout.connect(func do_interrupt() -> void:
		if is_fuzzed():
			_report = GdUnitReport.new().create(GdUnitReport.INTERUPTED, line_number(), GdAssertMessages.fuzzer_interuped(_current_iteration, "timedout"))
		else:
			_report = GdUnitReport.new().create(GdUnitReport.INTERUPTED, line_number(), GdAssertMessages.test_timeout(timeout))
		_interupted = true
		completed.emit()
		, CONNECT_DEFERRED)
	_timer.set_one_shot(true)
	_timer.set_wait_time(time)
	_timer.set_autostart(false)
	_timer.start()


func _set_failure_handler() -> void:
	if not GdUnitSignals.instance().gdunit_set_test_failed.is_connected(_failure_received):
		GdUnitSignals.instance().gdunit_set_test_failed.connect(_failure_received)


func _remove_failure_handler() -> void:
	if GdUnitSignals.instance().gdunit_set_test_failed.is_connected(_failure_received):
		GdUnitSignals.instance().gdunit_set_test_failed.disconnect(_failure_received)


func _failure_received(is_failed: bool) -> void:
	# is already failed?
	if _failed:
		return
	_failed = is_failed
	Engine.set_meta("GD_TEST_FAILURE", is_failed)


func stop_timer() -> void:
	# finish outstanding timeouts
	if is_instance_valid(_timer):
		_timer.stop()
		_timer.call_deferred("free")
		_timer = null


func expect_to_interupt() -> void:
	_expect_to_interupt = true


func is_interupted() -> bool:
	return _interupted


func is_expect_interupted() -> bool:
	return _expect_to_interupt


func is_parameterized() -> bool:
	return _parameter_set_resolver.is_parameterized()


func is_skipped() -> bool:
	return _skipped


func report() -> GdUnitReport:
	return _report


func skip_info() -> String:
	return _skip_reason


func line_number() -> int:
	return _line_number


func iterations() -> int:
	return _iterations


func seed_value() -> int:
	return _seed


func is_fuzzed() -> bool:
	return not _fuzzers.is_empty()


func fuzzer_arguments() -> Array[GdFunctionArgument]:
	return _fuzzers


func script_path() -> String:
	return _script_path


func ResourcePath() -> String:
	return _script_path


func generate_seed() -> void:
	if _seed != -1:
		seed(_seed)


func skip(skipped: bool, reason: String="") -> void:
	_skipped = skipped
	_skip_reason = reason


func set_function_descriptor(fd: GdFunctionDescriptor) -> void:
	_parameter_set_resolver = GdUnitTestParameterSetResolver.new(fd)


func set_test_parameter_index(index: int) -> void:
	_test_param_index = index


func test_parameter_index() -> int:
	return _test_param_index


func test_case_names() -> PackedStringArray:
	return _parameter_set_resolver.build_test_case_names(self)


func load_parameter_sets() -> Array:
	return _parameter_set_resolver.load_parameter_sets(self, true)


func parameter_set_resolver() -> GdUnitTestParameterSetResolver:
	return _parameter_set_resolver


func _to_string() -> String:
	return "%s :%d (%dms)" % [get_name(), _line_number, timeout]