extends Node2D

# Authoring tool for PlanetSetup resources (#40/#48): place/move/delete
# capture points and enemy spawns for a chosen surface profile, then save
# to res://PlanetSetups/<id>.tres so the game picks it up the same way it
# picks up every other authored setup. Deliberately does not touch
# GameState - this tool only edits committed resources, never gameplay
# state.
#
# The mutation methods below (new_setup/load_setup/add_*/move_*/remove_*/
# save_setup) are the editor's whole model and are safe to call directly
# without any touch input, which is how tests/test_setup_editor.gd drives
# them; the touch handlers at the bottom are a thin input layer on top.

# Preloaded by path rather than referenced by global class name, same as
# every other cross-file lookup added this session (see #42/#44's
# load-order notes) - a bare class-name reference needs the global
# class_name cache already warm, which an explicit script path never does.
const ENEMY_DEFINITIONS = preload("res://EnemyDefinitions.gd")
# By path, not by its `EnemyMarker` global name: the class_name cache is not
# guaranteed warm before an import pass has run, the same hazard PlanetSetups
# and PlanetSurfaceController already work around.
const ENEMY_MARKER = preload("res://EnemyMarker.gd")
const PLANET_SETUP_SCRIPT = preload("res://PlanetSetup.gd")
const PLANET_SETUP_SPAWN_SCRIPT = preload("res://PlanetSetupSpawn.gd")
const PALETTE_ENTRY_BUTTON_SCRIPT = preload("res://PaletteEntryButton.gd")

const MIN_ZOOM: float = 0.3
const MAX_ZOOM: float = 4.0
const WHEEL_ZOOM_STEP: float = 1.1
const HIT_RADIUS: float = 50.0
# #65: how far a single-finger press has to move before it counts as a pan
# rather than a tap-to-place, once it's confirmed not to be starting on an
# existing marker.
const PAN_DEADZONE: float = 24.0
const ORIGIN_COLOR: Color = Color(1.0, 0.9, 0.4)
# Duplicated from PaletteEntryButton.RING_COLOR rather than referenced
# cross-class - a global class_name lookup at parse time needs the class
# cache already warm (see #42/#44's load-order notes), which a plain
# local const sidesteps entirely.
const CAPTURE_MARKER_COLOR: Color = Color(0.55, 0.85, 1.0)
const PALETTE_STEP: float = 92.0

@onready var camera: Camera2D = $Camera2D
@onready var background: ColorRect = $BackgroundLayer/Background
@onready var item_host: Node2D = $ItemHost
@onready var back_button: IconButton = $UI/BackButton
@onready var profile_button: IconButton = $UI/ProfileButton
@onready var profile_value_label: Label = $UI/ProfileValueLabel
@onready var reward_button: IconButton = $UI/RewardButton
@onready var reward_value_label: Label = $UI/RewardValueLabel
@onready var name_input: LineEdit = $UI/NameInput
@onready var new_button: IconButton = $UI/NewButton
@onready var save_button: IconButton = $UI/SaveButton
@onready var load_button: IconButton = $UI/LoadButton
@onready var delete_button: IconButton = $UI/DeleteButton
@onready var status_label: Label = $UI/StatusLabel
@onready var selected_label: Label = $UI/SelectedLabel
@onready var palette_row: Control = $UI/PaletteRow
@onready var load_panel: Control = $UI/LoadPanel
@onready var load_list: ItemList = $UI/LoadPanel/List
@onready var load_close_button: IconButton = $UI/LoadPanel/CloseButton

var current_setup: Resource
var selected_palette: String = "capture_point"
var selected_item: Dictionary = {}
var _profile_ids: Array = []
var _profile_cursor: int = 0
# #64: replaced the old "Load cycles to the next saved setup" behaviour,
# which gave no way to see what existed or jump straight to one by name -
# kept only as the id list _load_list_setup_ids indexes into when the
# panel's own selection fires.
var _load_list_setup_ids: PackedStringArray = PackedStringArray()
var _palette_buttons: Array = []
var _origin_marker: NeonPiece

var touches: Dictionary = {}
var pinch_active: bool = false
var pinch_start_distance: float = 0.0
var pinch_start_zoom: float = 1.0
var drag_touch_index: int = -1
var drag_mode: String = ""
var dragging_item: Dictionary = {}
var pan_start_screen: Vector2 = Vector2.ZERO
var pan_start_camera: Vector2 = Vector2.ZERO


func _ready() -> void:
	_profile_ids = PlanetSurfaceProfiles.PROFILES.keys()
	back_button.pressed.connect(func(): get_tree().change_scene_to_file("res://MainMenu.tscn"))
	profile_button.pressed.connect(_on_profile_pressed)
	reward_button.pressed.connect(_on_reward_pressed)
	new_button.pressed.connect(_on_new_pressed)
	save_button.pressed.connect(_on_save_pressed)
	load_button.pressed.connect(_on_load_pressed)
	delete_button.pressed.connect(_on_delete_pressed)
	name_input.text_changed.connect(_on_name_changed)
	load_close_button.pressed.connect(func(): load_panel.visible = false)
	load_list.item_selected.connect(_on_load_list_item_selected)

	_origin_marker = NeonPiece.create(item_host, Vector2.ZERO, ORIGIN_COLOR)
	var cross_size: float = 26.0
	_origin_marker.add_line(Vector2(-cross_size, 0), Vector2(cross_size, 0), 0.6)
	_origin_marker.add_line(Vector2(0, -cross_size), Vector2(0, cross_size), 0.6)
	_origin_marker.queue_redraw()

	_build_palette()
	new_setup("untitled", "Untitled", _profile_ids[0])


# --- model: setup lifecycle -------------------------------------------------

func new_setup(setup_id: String, display_name: String, profile_id: String) -> void:
	current_setup = PLANET_SETUP_SCRIPT.new()
	current_setup.setup_id = setup_id
	current_setup.display_name = display_name
	current_setup.surface_profile_id = profile_id
	# capture_points/enemy_spawns are left at PlanetSetup's own declared
	# defaults (already empty) rather than reassigned here - assigning a
	# plain `[]` to enemy_spawns from outside PlanetSetup.gd's own file
	# fails at runtime, since the compiler here only sees current_setup as
	# a plain Resource and can't confirm the target is Array[Resource].
	selected_item = {}
	_refresh_selected_label()
	_profile_cursor = maxi(_profile_ids.find(profile_id), 0)
	if name_input != null:
		name_input.text = display_name
	_refresh_background()
	_rebuild_markers()
	_set_status("")


func load_setup(setup_id: String) -> bool:
	for setup in PlanetSetups.all():
		if setup.setup_id == setup_id:
			# Edit a duplicate so in-progress edits never mutate the live
			# registry entry (which other code may be reading) until an
			# explicit save.
			current_setup = setup.duplicate(true)
			selected_item = {}
			_refresh_selected_label()
			_profile_cursor = maxi(_profile_ids.find(current_setup.surface_profile_id), 0)
			if name_input != null:
				name_input.text = current_setup.display_name
			_refresh_background()
			_rebuild_markers()
			_set_status("Loaded '%s'." % setup_id)
			return true
	return false


func save_setup() -> Dictionary:
	if current_setup == null:
		return {"ok": false, "message": "No setup to save."}
	if current_setup.setup_id.strip_edges() == "":
		return {"ok": false, "message": "Name the setup before saving."}
	if not OS.has_feature("editor"):
		return {"ok": false, "message": "Setups can only be saved when running from the project."}
	var path: String = "res://PlanetSetups/%s.tres" % current_setup.setup_id
	var err: int = ResourceSaver.save(current_setup, path)
	if err != OK:
		return {"ok": false, "message": "Save failed (error %d)." % err}
	PlanetSetups.rescan()
	return {"ok": true, "message": "Saved '%s'." % current_setup.setup_id}


# --- model: capture points ---------------------------------------------

func add_capture_point(at: Vector2) -> int:
	if current_setup == null:
		return -1
	var points: PackedVector2Array = current_setup.capture_points
	points.append(at)
	current_setup.capture_points = points
	_rebuild_markers()
	return points.size() - 1


func move_capture_point(index: int, at: Vector2) -> void:
	if current_setup == null or index < 0 or index >= current_setup.capture_points.size():
		return
	current_setup.capture_points[index] = at
	_rebuild_markers()


func remove_capture_point(index: int) -> void:
	if current_setup == null or index < 0 or index >= current_setup.capture_points.size():
		return
	var points: PackedVector2Array = current_setup.capture_points
	points.remove_at(index)
	current_setup.capture_points = points
	_rebuild_markers()


# --- model: enemy spawns ------------------------------------------------

func add_enemy(enemy_id: String, at: Vector2) -> int:
	if current_setup == null:
		return -1
	var spawn: Resource = PLANET_SETUP_SPAWN_SCRIPT.new()
	spawn.enemy_id = enemy_id
	spawn.position = at
	current_setup.enemy_spawns.append(spawn)
	_rebuild_markers()
	return current_setup.enemy_spawns.size() - 1


func move_enemy(index: int, at: Vector2) -> void:
	if current_setup == null or index < 0 or index >= current_setup.enemy_spawns.size():
		return
	current_setup.enemy_spawns[index].position = at
	_rebuild_markers()


func remove_enemy(index: int) -> void:
	if current_setup == null or index < 0 or index >= current_setup.enemy_spawns.size():
		return
	current_setup.enemy_spawns.remove_at(index)
	_rebuild_markers()


# --- background/markers --------------------------------------------------

func _refresh_background() -> void:
	if current_setup == null or background == null:
		return
	var profile: Resource = PlanetSurfaceProfiles.get_profile(current_setup.surface_profile_id)
	var material: ShaderMaterial = background.material
	material.set_shader_parameter("base_color", profile.base_color)
	material.set_shader_parameter("crater_color", profile.crater_color)
	material.set_shader_parameter("highlight_color", profile.highlight_color)
	if profile_value_label != null:
		profile_value_label.text = current_setup.surface_profile_id.to_upper()
	_refresh_reward_label()


func _rebuild_markers() -> void:
	if item_host == null:
		return
	for child in item_host.get_children():
		if child != _origin_marker:
			child.queue_free()
	if current_setup == null:
		return
	for i in range(current_setup.capture_points.size()):
		_add_capture_marker(i, current_setup.capture_points[i])
	for i in range(current_setup.enemy_spawns.size()):
		_add_enemy_marker(i, current_setup.enemy_spawns[i])


func _add_capture_marker(index: int, at: Vector2) -> void:
	var is_selected: bool = selected_item.get("kind", "") == "capture" and selected_item.get("index", -1) == index
	var color: Color = Color(1.0, 0.95, 0.9) if is_selected else CAPTURE_MARKER_COLOR
	var marker: NeonPiece = NeonPiece.create(item_host, at, color)
	var points: PackedVector2Array = PackedVector2Array()
	for i in range(16):
		var angle: float = float(i) / 16.0 * TAU
		points.append(Vector2(cos(angle), sin(angle)) * 60.0)
	marker.add_polygon(points, 0.6)
	marker.queue_redraw()


func _add_enemy_marker(index: int, spawn: Resource) -> void:
	var definition: Resource = ENEMY_DEFINITIONS.get_definition(spawn.enemy_id)
	var is_selected: bool = selected_item.get("kind", "") == "enemy" and selected_item.get("index", -1) == index
	var color: Color = Color(1.0, 0.95, 0.9) if is_selected else definition.glow_color
	# Drawn through the same routine the enemy itself uses, rather than from
	# hull_points alone - a marker that does not look like what it places is
	# worse than no picture at all.
	var marker: Node2D = ENEMY_MARKER.new()
	marker.position = spawn.position
	marker.definition = definition
	marker.glow_color = color
	item_host.add_child(marker)


# --- palette ---------------------------------------------------------------

func _build_palette() -> void:
	var entries: Array = [{"id": "capture_point", "is_point": true, "definition": null}]
	for definition in ENEMY_DEFINITIONS.all():
		entries.append({"id": definition.enemy_id, "is_point": false, "definition": definition})

	var x: float = 0.0
	for entry in entries:
		var button: Control = PALETTE_ENTRY_BUTTON_SCRIPT.new()
		button.position = Vector2(x, 0)
		button.size = Vector2(84, 84)
		button.is_capture_point = entry.is_point
		button.enemy_definition = entry.definition
		button.selected = entry.id == selected_palette
		button.pressed.connect(_on_palette_pressed.bind(entry.id))
		palette_row.add_child(button)
		_palette_buttons.append(button)
		x += PALETTE_STEP


func _on_palette_pressed(id: String) -> void:
	selected_palette = id
	_refresh_palette_selection()


func _refresh_palette_selection() -> void:
	for button in _palette_buttons:
		var entry_id: String = "capture_point" if button.is_capture_point else button.enemy_definition.enemy_id
		button.selected = entry_id == selected_palette


# --- UI handlers -------------------------------------------------------

# What conquering this map is worth in research points. 0 keeps the planet
# type's own flat rate, so a setup that says nothing behaves as it always
# did; the rest let an author price a hard lab above an easy one.
const REWARD_OPTIONS: Array[int] = [0, 1, 2, 3, 5, 8]


func _on_reward_pressed() -> void:
	if current_setup == null:
		return
	var index: int = REWARD_OPTIONS.find(int(current_setup.research_point_reward))
	current_setup.research_point_reward = REWARD_OPTIONS[(index + 1) % REWARD_OPTIONS.size()]
	_refresh_reward_label()


func _refresh_reward_label() -> void:
	if reward_value_label == null or current_setup == null:
		return
	var reward: int = int(current_setup.research_point_reward)
	reward_value_label.text = "DEFAULT RP" if reward <= 0 else "%d RESEARCH PT" % reward


func _on_profile_pressed() -> void:
	if _profile_ids.is_empty():
		return
	_profile_cursor = (_profile_cursor + 1) % _profile_ids.size()
	current_setup.surface_profile_id = _profile_ids[_profile_cursor]
	_refresh_background()


func _on_new_pressed() -> void:
	new_setup("untitled", "Untitled", _profile_ids[_profile_cursor])


func _on_save_pressed() -> void:
	var result: Dictionary = save_setup()
	_set_status(result.message)


func _on_load_pressed() -> void:
	var setups: Array = PlanetSetups.all()
	if setups.is_empty():
		_set_status("No saved setups yet.")
		return
	load_list.clear()
	_load_list_setup_ids = PackedStringArray()
	for setup in setups:
		load_list.add_item("%s  (%s)" % [setup.display_name, setup.surface_profile_id])
		_load_list_setup_ids.append(setup.setup_id)
	load_panel.visible = true


func _on_load_list_item_selected(index: int) -> void:
	if index < 0 or index >= _load_list_setup_ids.size():
		return
	load_setup(_load_list_setup_ids[index])
	load_panel.visible = false


func _on_delete_pressed() -> void:
	if selected_item.is_empty():
		_set_status("Nothing selected to delete.")
		return
	if selected_item.kind == "capture":
		remove_capture_point(selected_item.index)
	else:
		remove_enemy(selected_item.index)
	selected_item = {}
	_refresh_selected_label()


func _on_name_changed(new_text: String) -> void:
	if current_setup == null:
		return
	current_setup.display_name = new_text
	current_setup.setup_id = _sanitize_id(new_text)


func _sanitize_id(text: String) -> String:
	var lowered: String = text.strip_edges().to_lower()
	var result: String = ""
	for c in lowered:
		result += c if (c.to_lower() != c.to_upper() or c == "_" or (c >= "0" and c <= "9")) else "_"
	return result if result != "" else "untitled"


func _set_status(message: String) -> void:
	if status_label != null:
		status_label.text = message


# #66: names the currently-selected marker so a tap actually confirms what
# got picked, instead of the player having to infer it from which dot on
# screen turned white.
func _refresh_selected_label() -> void:
	if selected_label == null:
		return
	if selected_item.is_empty() or current_setup == null:
		selected_label.text = ""
		return
	var index: int = int(selected_item.index)
	if selected_item.kind == "capture":
		selected_label.text = "Selected: Capture Point #%d" % (index + 1)
	else:
		var spawn: Resource = current_setup.enemy_spawns[index]
		var definition: Resource = ENEMY_DEFINITIONS.get_definition(spawn.enemy_id)
		selected_label.text = "Selected: %s #%d" % [definition.display_name, index + 1]


# --- placement/selection helpers ----------------------------------------

func _place_selected(world_pos: Vector2) -> void:
	if selected_palette == "capture_point":
		add_capture_point(world_pos)
	else:
		add_enemy(selected_palette, world_pos)


func _find_marker_near(world_pos: Vector2) -> Dictionary:
	if current_setup == null:
		return {}
	var best: Dictionary = {}
	var best_dist: float = HIT_RADIUS
	for i in range(current_setup.capture_points.size()):
		var d: float = world_pos.distance_to(current_setup.capture_points[i])
		if d <= best_dist:
			best_dist = d
			best = {"kind": "capture", "index": i}
	for i in range(current_setup.enemy_spawns.size()):
		var d: float = world_pos.distance_to(current_setup.enemy_spawns[i].position)
		if d <= best_dist:
			best_dist = d
			best = {"kind": "enemy", "index": i}
	return best


func _move_selected(world_pos: Vector2) -> void:
	if dragging_item.is_empty():
		return
	if dragging_item.kind == "capture":
		move_capture_point(dragging_item.index, world_pos)
	else:
		move_enemy(dragging_item.index, world_pos)


func _screen_to_world(screen_pos: Vector2) -> Vector2:
	var viewport_size: Vector2 = get_viewport_rect().size
	return camera.position + (screen_pos - viewport_size / 2.0) / camera.zoom.x


# --- touch/pan/zoom (mirrors GameController's pinch idiom) ---------------

func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventScreenTouch:
		_handle_touch(event)
	elif event is InputEventScreenDrag:
		_handle_drag(event)
	elif event is InputEventMagnifyGesture:
		_set_zoom(camera.zoom.x * event.factor)
	elif event is InputEventMouseButton and event.pressed:
		if event.button_index == MOUSE_BUTTON_WHEEL_UP:
			_set_zoom(camera.zoom.x * WHEEL_ZOOM_STEP)
		elif event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
			_set_zoom(camera.zoom.x / WHEEL_ZOOM_STEP)


func _handle_touch(event: InputEventScreenTouch) -> void:
	if event.pressed:
		touches[event.index] = event.position
		if touches.size() == 2:
			_start_pinch()
			drag_touch_index = -1
			drag_mode = ""
			return
		if touches.size() == 1:
			var world_pos: Vector2 = _screen_to_world(event.position)
			var hit: Dictionary = _find_marker_near(world_pos)
			drag_touch_index = event.index
			pan_start_screen = event.position
			pan_start_camera = camera.position
			if not hit.is_empty():
				selected_item = hit
				dragging_item = hit
				drag_mode = "item"
				_rebuild_markers()
				_refresh_selected_label()
			else:
				# #65: a press over empty canvas no longer commits to placing
				# an item immediately - it might be the start of a pan. Which
				# one it turns out to be is only known on release (still
				# under PAN_DEADZONE = a tap = place) or once a drag actually
				# crosses that deadzone (= a pan), same tap-vs-drag idiom
				# GasBombController uses for its own AIM_DEADZONE.
				dragging_item = {}
				drag_mode = "pending"
	else:
		if event.index == drag_touch_index:
			if drag_mode == "pending":
				_place_selected(_screen_to_world(event.position))
			drag_touch_index = -1
			drag_mode = ""
			dragging_item = {}
		touches.erase(event.index)
		if touches.size() < 2:
			pinch_active = false


func _handle_drag(event: InputEventScreenDrag) -> void:
	if not touches.has(event.index):
		return
	touches[event.index] = event.position

	if pinch_active and touches.size() == 2 and pinch_start_distance > 0.0:
		var positions: Array = touches.values()
		var current_distance: float = positions[0].distance_to(positions[1])
		_set_zoom(pinch_start_zoom * (current_distance / maxf(pinch_start_distance, 1.0)))
		return

	if event.index != drag_touch_index:
		return
	if drag_mode == "pending" and event.position.distance_to(pan_start_screen) >= PAN_DEADZONE:
		drag_mode = "pan"
	match drag_mode:
		"item":
			_move_selected(_screen_to_world(event.position))
		"pan":
			var delta_screen: Vector2 = event.position - pan_start_screen
			camera.position = pan_start_camera - delta_screen / camera.zoom.x


func _start_pinch() -> void:
	pinch_active = true
	var positions: Array = touches.values()
	pinch_start_distance = positions[0].distance_to(positions[1])
	pinch_start_zoom = camera.zoom.x


func _set_zoom(raw_zoom: float) -> void:
	var z: float = clampf(raw_zoom, MIN_ZOOM, MAX_ZOOM)
	camera.zoom = Vector2(z, z)