extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_desktop_combat.gd
# Forgejo #80: on a computer the mouse aims and the left button fires, and the
# number keys pick the weapon - 1 the fleet's guns, 2 and up the abilities.
#
# Covers:
#   A. the weapon numbering is FIXED and named, so "2" is the gas bomb in
#      every scene rather than whatever node order happens to produce
#   B. holding the button with weapon 1 selected points the fleet's guns at
#      the cursor, through the same controller the stick uses - not a second
#      thing that aims
#   C. releasing stops it
#   D. the stick WINS while it is held, so a mouse resting somewhere cannot
#      override a finger
#   E. selecting an ability highlights its button, so what a click will do is
#      on screen rather than remembered
#   F. it is inert on a touch device. Godot emulates a mouse button from every
#      touch, so without that guard a tap on a phone would fire the guns

var game_state: Node
var main: Node
var fleet: Node
var mouse: Node
var fire_stick: Node
var stick: Control
var stage: int = 0
var elapsed: float = 0.0


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.buildings.clear()
	game_state.extractors.clear()
	game_state.reset_progression()
	main = load("res://world/Main.tscn").instantiate()
	root.add_child(main)
	current_scene = main
	fleet = main.get_node("Fleet")
	mouse = main.get_node("MouseCombatController")
	# Checked here rather than at first use: a script that fails to PARSE
	# leaves a bare Node2D in the scene, and every call against it becomes a
	# per-frame "nonexistent function" error that runs until the harness
	# times the test out three minutes later instead of failing in one line.
	if not mouse.has_method("weapon_count"):
		print("TEST_DESKTOP_COMBAT: FAIL (MouseCombatController.gd did not load - see the parse error above)")
		quit(1)
		return
	fire_stick = main.get_node("FireStickController")
	stick = main.get_node("UI/FireStick")


func _weapon_heading() -> Vector2:
	return fire_stick.aim_direction


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			if elapsed < 0.3:
				return false
			main.get_node("EnemySpawner").set_process(false)
			main.get_node("AsteroidField").set_process(false)
			for hazard in get_nodes_in_group("asteroids") + get_nodes_in_group("enemies"):
				if is_instance_valid(hazard):
					hazard.queue_free()
			fleet.spawn_ships(1, Vector2.ZERO, PackedStringArray([GameState.VESSEL_INTERCEPTOR]))

			# --- A. fixed, named ordering ---------------------------------
			if mouse.weapon_count() != mouse.abilities.size() + 1:
				return _fail("weapon count %d does not match 1 + %d abilities" \
					% [mouse.weapon_count(), mouse.abilities.size()])
			if mouse.abilities.is_empty():
				return _fail("no ability controllers were resolved, so the number keys address nothing")
			if mouse.abilities[0] != main.get_node("GasBombController"):
				return _fail("weapon 2 is not the gas bomb - the ticket names it explicitly")
			if not mouse.select_weapon(0):
				return _fail("could not select the default weapon")
			if mouse.select_weapon(mouse.weapon_count()):
				return _fail("selecting a weapon past the end was accepted")
			print("weapon 1 is the fleet's guns, weapon 2 is the gas bomb, %d in total" \
				% mouse.weapon_count())

			# --- F. inert while the player is using touch ------------------
			# #171: the gate used to be "does this machine have a
			# touchscreen", which is a capability rather than a fact and is
			# answered wrongly by every browser on a touch-capable laptop. It
			# is now the last input actually used - which, unlike the display
			# query, can be driven here, so both branches are exercised
			# instead of whichever one this machine happens to report.
			if mouse.pointer_mode != mouse.PointerMode.AUTO:
				return _fail("the scene ships with an overridden pointer mode, so what a real device does is not what was tested")
			game_state.note_touch_input()
			if mouse.is_enabled():
				return _fail("mouse combat is armed while the player is using touch - a tap would fire the guns")
			game_state.last_touch_msec = -1
			game_state.note_pointer_input()
			if not mouse.is_enabled():
				return _fail("mouse combat is off for a player using a mouse")
			print("gated on the last input used: off under touch, on under a mouse")

			# Everything below is about the AIMING, not the guard. Headless
			# reports a touchscreen, so the mode is forced on here - otherwise
			# these cases would silently never run and this file would test
			# nothing but the line above.
			mouse.pointer_mode = mouse.PointerMode.ON
			if not mouse.is_enabled():
				return _fail("forcing the pointer mode on did not enable it")
			stage = 1
			elapsed = 0.0
			return false
		1:
			if elapsed < 0.1:
				return false
			# --- B. holding the button aims the guns at the cursor ---------
			mouse.select_weapon(0)
			mouse.aim_world = fleet.get_centroid() + Vector2(0.0, -500.0)
			mouse.firing = true
			mouse._process(0.0)
			fire_stick._process(0.0)
			var heading: Vector2 = _weapon_heading().normalized()
			if heading.distance_to(Vector2(0.0, -1.0)) > 0.05:
				return _fail("holding the button aimed along %s, but the cursor was straight up" % heading)
			print("holding the button aims the guns at the cursor")

			# --- C. releasing stops -----------------------------------------
			mouse.firing = false
			mouse._process(0.0)
			fire_stick._process(0.0)
			if _weapon_heading() != Vector2.ZERO:
				return _fail("releasing the button left the guns aimed at %s" % _weapon_heading())
			print("releasing stops the guns")

			# --- D. a held stick wins ---------------------------------------
			var centre: Vector2 = stick.global_position + stick.size * 0.5
			var press := InputEventScreenTouch.new()
			press.index = 9
			press.pressed = true
			press.position = centre
			stick.handle_touch(press)
			var drag := InputEventScreenDrag.new()
			drag.index = 9
			drag.position = centre + Vector2(stick.max_radius, 0.0)
			stick.handle_drag(drag)
			mouse.aim_world = fleet.get_centroid() + Vector2(0.0, -500.0)
			mouse.firing = true
			mouse._process(0.0)
			fire_stick._process(0.0)
			var contested: Vector2 = _weapon_heading().normalized()
			if contested.distance_to(Vector2(1.0, 0.0)) > 0.05:
				return _fail("with the stick pushed right and the mouse aiming up, the guns went %s - the stick must win" % contested)
			print("a held stick overrides the mouse")
			var release := InputEventScreenTouch.new()
			release.index = 9
			release.pressed = false
			release.position = centre
			stick.handle_touch(release)
			mouse.firing = false

			# --- E. the chosen ability is shown ----------------------------
			mouse.select_weapon(1)
			var bomb_button: Node = mouse.abilities[0].button
			if not bomb_button.highlighted:
				return _fail("selecting the gas bomb did not highlight its button")
			mouse.select_weapon(0)
			if bomb_button.highlighted:
				return _fail("going back to the guns left the gas bomb still highlighted")
			print("the selected ability's own button carries the selection")

			print("TEST_DESKTOP_COMBAT: PASS")
			quit(0)
			return true
	return false


func _fail(message: String) -> bool:
	print("TEST_DESKTOP_COMBAT: FAIL (%s)" % message)
	quit(1)
	return true