extends SceneTree

## Game-flow state machine + boss-room entry rules (AnchorV1.0 §4.5 / §19.5).

var failures: Array[String] = []


func _init() -> void:
	_run.call_deferred()


func _run() -> void:
	var flow: Node = load("res://autoload/game_flow_manager.gd").new()
	flow.set("manage_scene", false)
	root.add_child(flow)
	await process_frame

	# --- screens exist for every menu state ---
	for state_name: StringName in [&"Title", &"DifficultySelect", &"Paused", &"VolumeSettings", &"ExitGameConfirm", &"ReturnTitleConfirm", &"Defeat", &"Victory", &"Result"]:
		var screens: Dictionary = flow.get("_screens")
		_expect_bool(screens.has(state_name), true, "screen for %s exists" % state_name)
	var flow_ui := flow.get_node_or_null("FlowUI")
	_expect_bool(flow_ui != null, true, "flow UI layer exists")
	if flow_ui != null:
		_expect_bool(flow_ui.get_node_or_null("PauseButton") == null, true, "HUD should not show a top-right pause button; pause is Esc-only")

	# --- pause / resume drive the SceneTree pause + rhythm clock ---
	flow.set("state", &"Gameplay_FrontArea")
	var esc := InputEventAction.new()
	esc.action = &"ui_cancel"
	esc.pressed = true
	flow.call("_unhandled_input", esc)
	_expect_string(str(flow.get("state")), "Paused", "Esc enters Paused")
	_expect_bool(root.get_tree().paused, true, "pause stops the SceneTree")
	flow.call("_unhandled_input", esc)
	_expect_string(str(flow.get("state")), "Gameplay_FrontArea", "Esc resumes gameplay")
	_expect_bool(root.get_tree().paused, false, "resume releases the SceneTree")

	# --- boss-room entry rules on a synthetic scene (§4.5) ---
	var scene := _build_fake_scene()
	root.add_child(scene)
	current_scene = scene
	await process_frame
	var player := scene.get_node("Stage/ActorsContainer/Player")
	var streak := player.get_node("StreakCounter")
	streak.set("streak", 9)
	var combo := player.get_node("ComboWindow")
	combo.call("record", &"A")
	combo.call("record", &"A")
	var buff := player.get_node("AttackBuffComponent")
	var container := player.get_node("EffectContainer")
	for index: int in range(6):
		container.call("add_effect", buff.get("buff_definition"), &"test")
	_expect_int(int(buff.call("attack_buff_stacks")), 6, "test setup should reach 6 buff stacks")

	flow.set("state", &"Gameplay_FrontArea")
	flow.set("_boss_room_entered", false)
	flow.call("enter_boss_room")

	_expect_string(str(flow.get("state")), "Gameplay_BossRoom", "entering the boss room switches state")
	_expect_int(int(streak.get("streak")), 0, "boss entry clears the combo counter")
	_expect_int((combo.call("get_slots") as Array).size(), 0, "boss entry clears the four-slot window")
	_expect_int(int(buff.call("attack_buff_stacks")), 3, "boss entry caps the attack buff at 3 stacks")
	var boss := scene.get_node("Stage/ActorsContainer/Boss")
	_expect_bool(bool(boss.get("combat_enabled")), true, "boss combat unlocks on entry")
	_expect_bool(bool(boss.get("stationary")), false, "boss leaves training-dummy mode on entry")

	# --- re-entering is a no-op ---
	streak.set("streak", 5)
	flow.call("enter_boss_room")
	_expect_int(int(streak.get("streak")), 5, "boss entry rules apply only once")

	# --- rank appears only on victory (§19.6) ---
	flow.set("_victory", true)
	flow.set("state", &"Result")
	flow.call("_populate_result_screen")
	var labels: Dictionary = flow.get("_result_labels")
	_expect_bool((labels.get("rank") as Label).visible, true, "victory result shows the rank")
	flow.set("_victory", false)
	flow.call("_populate_result_screen")
	_expect_bool((labels.get("rank") as Label).visible, false, "defeat result hides the rank")

	current_scene = null
	scene.free()
	flow.free()
	_finish()


func _build_fake_scene() -> Node:
	var scene := Node.new()
	scene.name = "Main"
	var stage := Node2D.new()
	stage.name = "Stage"
	scene.add_child(stage)
	var actors := Node2D.new()
	actors.name = "ActorsContainer"
	stage.add_child(actors)

	var player := CharacterBody2D.new()
	player.name = "Player"
	actors.add_child(player)
	var streak: Node = load("res://scenes/components/streak_counter.gd").new()
	streak.name = "StreakCounter"
	player.add_child(streak)
	var combo: Node = load("res://scenes/components/combo_window.gd").new()
	combo.name = "ComboWindow"
	player.add_child(combo)
	var container: Node = load("res://scenes/components/effect_container.gd").new()
	container.name = "EffectContainer"
	player.add_child(container)
	var buff: Node = load("res://scenes/components/attack_buff_component.gd").new()
	buff.name = "AttackBuffComponent"
	player.add_child(buff)

	var boss_script := GDScript.new()
	boss_script.source_code = "extends Node2D\nvar combat_enabled := false\nvar stationary := true\n"
	boss_script.reload()
	var boss := Node2D.new()
	boss.name = "Boss"
	boss.set_script(boss_script)
	actors.add_child(boss)
	return scene


func _expect_bool(actual: bool, expected: bool, label: String) -> void:
	if actual != expected:
		failures.append("%s: expected %s, got %s" % [label, expected, actual])


func _expect_int(actual: int, expected: int, label: String) -> void:
	if actual != expected:
		failures.append("%s: expected %d, got %d" % [label, expected, actual])


func _expect_string(actual: String, expected: String, label: String) -> void:
	if actual != expected:
		failures.append("%s: expected %s, got %s" % [label, expected, actual])


func _finish() -> void:
	paused = false
	if failures.is_empty():
		print("PASS game flow")
		quit(0)
	else:
		for failure: String in failures:
			push_error(failure)
		quit(1)