extends RefCounted
## Tests for GCDTimer. Run headless via tests/run_all.gd
var _test_failures := 0


func test_gcd_starts_ready() -> void:
	var gcd := GCDTimer.new(2.5)
	assert_true(gcd.is_ready(), "GCD should start ready")


func test_gcd_blocks_immediate_reuse() -> void:
	var gcd := GCDTimer.new(2.5)
	assert_true(gcd.consume(), "First consume should succeed")
	assert_false(gcd.is_ready(), "GCD should not be ready after consume")
	assert_false(gcd.consume(), "Second consume should be blocked")


func test_gcd_recovers_after_full_duration() -> void:
	var gcd := GCDTimer.new(2.5)
	gcd.consume()
	gcd.tick(1.0)
	assert_false(gcd.is_ready(), "Should not be ready at 1.0s")
	gcd.tick(1.5)
	assert_true(gcd.is_ready(), "Should be ready at 2.5s total")
	assert_true(gcd.consume(), "Should be able to consume after recovery")


func test_gcd_queue_window() -> void:
	var gcd := GCDTimer.new(2.5)
	gcd.consume()
	gcd.tick(2.0)
	assert_false(gcd.is_in_queue_window(), "Not in queue window at 0.5s remaining")
	gcd.tick(0.3)
	assert_true(gcd.is_in_queue_window(), "Should be in queue window at 0.2s remaining")
	gcd.tick(0.3)
	assert_true(gcd.is_ready(), "Should be ready after full duration elapses")


func test_gcd_progress() -> void:
	var gcd := GCDTimer.new(2.5)
	assert_almost(gcd.get_progress(), 1.0, "Progress should be 1.0 when ready")
	gcd.consume()
	assert_almost(gcd.get_progress(), 0.0, "Progress should be ~0.0 just after consume")
	gcd.tick(1.25)
	assert_almost(gcd.get_progress(), 0.5, "Progress should be 0.5 at half duration")


func test_gcd_duration_modification() -> void:
	var gcd := GCDTimer.new(2.5)
	gcd.set_duration(2.0)
	assert_almost(gcd.get_total(), 2.0, "Duration should be updated")
	gcd.consume()
	gcd.tick(2.0)
	assert_true(gcd.is_ready(), "Should recover in new duration")


func test_gcd_reset() -> void:
	var gcd := GCDTimer.new(2.5)
	gcd.consume()
	gcd.reset()
	assert_true(gcd.is_ready(), "Should be ready after reset")


# --- Helper assertion methods (lightweight, no GUT dependency) ---

func assert_true(condition: bool, msg: String = "") -> void:
	if not condition:
		_test_failures += 1
		push_error("ASSERT FAILED [true]: " + msg)


func assert_false(condition: bool, msg: String = "") -> void:
	if condition:
		_test_failures += 1
		push_error("ASSERT FAILED [false]: " + msg)


func assert_almost(value: float, expected: float, msg: String = "", tolerance: float = 0.01) -> void:
	if abs(value - expected) > tolerance:
		_test_failures += 1
		push_error("ASSERT FAILED [almost %f != %f]: %s" % [value, expected, msg])