extends Node

const GAME := preload("res://scenes/game/game.tscn")
var held := false
var _last_mouse := Vector2.ZERO

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

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

func _ready() -> void:
	GameState.start_new_run()
	var game := GAME.instantiate()
	add_child(game)
	await get_tree().process_frame
	await get_tree().process_frame
	game.set_physics_process(false)
	var player := game.get_node("PlayerShip") as CharacterBody2D
	player.set_physics_process(false)
	player.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")
	hud.call("_toggle_inventory")
	var drawer: Control = hud.get("_inventory_clip")
	drawer.set_meta("floating_window_dragged", true)
	drawer.global_position = Vector2(32, 100)
	var inventory: ShipInventory = player.get_node("ShipInventory")
	var item := preload("res://scripts/items/item_generator.gd").generate_for_definition(preload("res://resources/items/hull_plating.tres"), 1)
	assert(inventory.add_item(item))
	await get_tree().process_frame
	await get_tree().process_frame
	var panel: Control = hud.get("inventory_panel")
	var source := panel.get_node("Contents/CargoGrid").get_child(0) as Control
	var origin := source.get_global_rect().get_center()
	var cursor := hud.get_node("FlightCursor")
	# The aiming cursor is only active in free game space.
	motion(Vector2(650, 150))
	await get_tree().process_frame
	cursor.call("_process", 0.0)
	assert(cursor.aiming)
	motion(origin)
	await get_tree().process_frame
	cursor.call("_process", 0.0)
	assert(not cursor.aiming)
	# Start a real native drag, then pass over a raised crafting window.
	mouse(origin, true)
	motion(origin + Vector2(24, 6))
	await get_tree().process_frame
	assert(get_viewport().gui_is_dragging())
	var craft: Control = hud.get("_crafting_window")
	craft.position = Vector2(420, 160)
	craft.show()
	hud.get_node("HUDRoot/FloatingWindows").call("focus_window", craft)
	motion(Vector2(660, 300))
	await get_tree().process_frame
	await get_tree().process_frame
	var overlay := get_tree().get_first_node_in_group("item_drag_overlay") as CanvasLayer
	assert(overlay != null)
	assert(overlay.layer > hud.layer and overlay.layer > 50)
	var icon: Control = overlay.get_node("DragIcon")
	assert(icon.visible)
	assert((icon.position + icon.size * 0.5).is_equal_approx(Vector2(660, 300)))
	assert(icon.mouse_filter == Control.MOUSE_FILTER_IGNORE)
	assert(not cursor.should_aim())
	if "--capture-preview" in OS.get_cmdline_user_args():
		await RenderingServer.frame_post_draw
		get_viewport().get_texture().get_image().save_png("res://artifacts/item_drag_preview.png")
	mouse(Vector2(660, 300), false)
	await get_tree().process_frame
	await get_tree().process_frame
	assert(not icon.visible and inventory.cargo[0] == item)
	# A subsequent drag still delivers the module to its equipment slot.
	craft.hide()
	hud.get_node("HUDRoot/FloatingWindows").call("focus_window", drawer)
	motion(origin)
	mouse(origin, true)
	motion(origin + Vector2(24, 6))
	await get_tree().process_frame
	var target: Control = hud.get("_sidebar").get_node("Scroll/Contents/ShipEquipmentPanel/Contents/EquipmentLayout/Module2")
	await get_tree().process_frame
	assert(target.get("_drop_highlight"))
	assert(not target.get_parent().get_node("Module1").get("_drop_highlight"))
	assert(not target.get_parent().get_node("Extension1").get("_drop_highlight"))
	var sidebar: Control = hud.get("_sidebar")
	assert(not sidebar.get_node("Scroll").get_v_scroll_bar().visible)
	assert(sidebar.position.y + sidebar.size.y * sidebar.scale.y <= 720.0)
	var destination := target.get_global_rect().get_center()
	motion(destination)
	await get_tree().process_frame
	mouse(destination, false)
	await get_tree().process_frame
	await get_tree().process_frame
	assert(inventory.module_slots[1] == item and inventory.cargo[0] == null)
	assert(not icon.visible)
	# Modal UI, defeat, docking and pause all suppress the aiming cursor.
	var skills: CanvasLayer = hud.get("_captain_skills_ui")
	skills.call("open_management")
	motion(Vector2(650, 350))
	await get_tree().process_frame
	assert(not cursor.should_aim())
	skills.call("_close")
	motion(Vector2(650, 150))
	await get_tree().process_frame
	player.set("_is_destroyed", true)
	assert(not cursor.should_aim())
	player.set("_is_destroyed", false)
	player.set("is_docked", true)
	assert(not cursor.should_aim())
	player.set("is_docked", false)
	get_tree().paused = true
	assert(not cursor.should_aim())
	get_tree().paused = false
	cursor.call("_process", 0.0)
	game.queue_free()
	await get_tree().process_frame
	print("DRAG_CURSOR_TEST: PASS centered overlay above windows, cancel/drop, UI/space cursor and cleanup")
	get_tree().quit()