extends Node

const GAME := preload("res://scenes/game/game.tscn")

func motion(point: Vector2, relative: Vector2 = Vector2.ZERO) -> void:
	var event := InputEventMouseMotion.new()
	event.position = point
	event.global_position = point
	event.relative = relative
	event.button_mask = MOUSE_BUTTON_MASK_LEFT if Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT) else 0
	get_viewport().push_input(event, true)

func mouse(point: Vector2, pressed: bool) -> void:
	var event := InputEventMouseButton.new()
	event.position = point
	event.global_position = point
	event.button_index = MOUSE_BUTTON_LEFT
	event.pressed = pressed
	event.button_mask = MOUSE_BUTTON_MASK_LEFT if pressed else 0
	get_viewport().push_input(event, true)

func click(point: Vector2) -> void:
	motion(point)
	mouse(point, true)
	mouse(point, false)

func drag(header: Control, displacement: Vector2) -> void:
	var origin := header.get_global_rect().position + Vector2(15, header.get_global_rect().size.y * 0.5)
	motion(origin)
	mouse(origin, true)
	motion(origin + displacement, displacement)
	mouse(origin + displacement, false)

func _ready() -> void:
	process_mode = Node.PROCESS_MODE_ALWAYS
	GameState.start_new_run()
	var game := GAME.instantiate() as Node2D
	add_child(game)
	await get_tree().process_frame
	await get_tree().process_frame
	game.set_physics_process(false)
	var ship := game.get_node("PlayerShip") as CharacterBody2D
	ship.set_physics_process(false)
	ship.get_node("WeaponController").set_physics_process(false)
	for enemy in get_tree().get_nodes_in_group("enemies"):
		enemy.set_physics_process(false)
	var hud := game.get_node("HUD")
	var manager := hud.get_node("HUDRoot/FloatingWindows")
	var craft: PanelContainer = hud.get("_crafting_window")
	var inventory: Control = hud.get("inventory_panel")
	var drawer: Control = hud.get("_inventory_clip")
	var sidebar: Control = hud.get("_sidebar")
	hud.call("_toggle_inventory")
	craft.show()
	await get_tree().process_frame
	await get_tree().process_frame
	# Put inventory directly behind crafting. Its salvage button occupies the same pixel.
	drawer.set_meta("floating_window_dragged", true)
	var recipe: Button = craft.get_node("Contents/CraftingPanel").get("_recipe_buttons")["parts"]
	var point := recipe.get_global_rect().get_center()
	var first_slot := inventory.get_node("Contents/CargoGrid").get_child(0) as Control
	drawer.global_position += point - first_slot.get_global_rect().get_center()
	manager.call("focus_window", drawer)
	manager.call("focus_window", craft)
	var stock := ship.get_node("ShipInventory") as ShipInventory
	var item := ItemInstance.new()
	item.definition = preload("res://resources/items/plasma_cannon.tres")
	assert(stock.add_item(item))
	GameState.captain.minerals.merge({"iron": 2, "titanium": 2, "aluminium": 2}, true)
	GameState.captain.emit_changed()
	await get_tree().process_frame
	assert(manager.call("window_at", point) == craft)
	click(point)
	assert(GameState.captain.parts == 1.0, "Top crafting button must receive the click")
	assert(stock.cargo[0] == item, "Underlying inventory must not consume the click")
	assert(craft.z_index > drawer.z_index)
	assert(craft.get_index() > drawer.get_index())
	# Dragging a title moves its window; content clicks do not start a window drag.
	var before := craft.global_position
	drag(craft.get_node("Contents/Header"), Vector2(-80, -60))
	assert(craft.global_position.is_equal_approx(before + Vector2(-80, -60)))
	await get_tree().process_frame
	assert(craft.global_position.is_equal_approx(before + Vector2(-80, -60)))
	# The exposed inventory header can activate and raise the lower window.
	drawer.global_position = Vector2(70, 80)
	manager.call("focus_window", craft)
	var inv_header := inventory.get_node("Contents/Header") as Control
	click(inv_header.get_global_rect().position + Vector2(10, 8))
	assert(drawer.z_index > craft.z_index and drawer.get_index() > craft.get_index())
	before = drawer.global_position
	drag(inv_header, Vector2(100, 80))
	assert(drawer.global_position.is_equal_approx(before + Vector2(100, 80)))
	hud.call("_layout_inventory")
	assert(drawer.global_position.is_equal_approx(before + Vector2(100, 80)))
	# Close buttons do not turn into drag handles; reopening preserves the moved position.
	click(inventory.get_node("Contents/Header/CloseButton").get_global_rect().get_center())
	assert(not inventory.visible)
	inventory.call("_set_drawer_open", true)
	assert(drawer.global_position.is_equal_approx(before + Vector2(100, 80)))
	# Sidebar dragging survives equipment relayout and viewport clamping.
	manager.call("focus_window", sidebar)
	before = sidebar.global_position
	drag(sidebar.get_node("Scroll/Contents/ShipEquipmentPanel/Contents/Title"), Vector2(-100, -50))
	hud.call("_layout_sidebar")
	assert(sidebar.global_position.is_equal_approx(before + Vector2(-100, -50)))
	# The captain modal remains draggable while paused and blocks windows below it.
	var skills: CanvasLayer = hud.get("_captain_skills_ui")
	skills.call("open_management")
	await get_tree().process_frame
	await get_tree().process_frame
	assert(get_tree().paused)
	var panel: Control = skills.get("_panel")
	before = panel.global_position
	drag((skills.get("_contents") as Control).get_node("Header"), Vector2(50, 30))
	assert(panel.global_position.is_equal_approx(before + Vector2(50, 30)))
	skills.call("_layout")
	assert(panel.global_position.is_equal_approx(before + Vector2(50, 30)))
	skills.call("_close")
	assert(not get_tree().paused)
	assert(not ship.get_node("WeaponController").get("_fire_buttons_down")[0])
	print("FLOATING_WINDOWS_TEST: PASS (real GUI click routing over inventory, matching z/tree order, title drag, focus/raise, close/reopen, relayout persistence, paused captain modal, gameplay input blocked)")
	get_tree().quit()