settled-reach/client/ui/implant/atlas_panel.gd

class_name AtlasPanel
extends Control

## Atlas implant panel — 4-level navigation (#834, #835):
## system picker → orbital diagram → body entry → regional viewer.
## FULLSCREEN implant app (z=20) at implant/map/atlas per D-170.
## Uses ImplantPanel component library (D-169). Data from star_map_data.json.
##
## Navigation:
##   Level 0 SYSTEM_PICKER    — ◄ ► cycle systems, Enter to open orbital view
##   Level 1 ORBITAL_DIAGRAM  — rendered via _draw(), click body → level 2, click station → mini panel
##   Level 2 BODY_ENTRY       — body info panel, Enter to open heightmap viewer, Esc back
##   Level 3 HEIGHTMAP_VIEWER — AtlasViewer with pan/zoom + markers + city data (#835), Esc back

## Emitted when the viewer's city-data panel requests the economics monitor for
## the current system. main.gd bridges this to EconomicsPanel.select_system()
## + HudGroups.open_app("implant/economics") — D-191 cross-panel integration.
signal economics_link_requested(system_id: String)

enum Level { SYSTEM_PICKER = 0, ORBITAL_DIAGRAM = 1, BODY_ENTRY = 2, HEIGHTMAP_VIEWER = 3 }

const APP_PATH := "implant/map/atlas"
const STAR_MAP_DATA := "res://data/star_map_data.json"
const PANEL_WIDTH: float = 320.0
const PANEL_MARGIN: float = 16.0

# ── Orbital diagram geometry ──────────────────────────────────────────────────
const ORBITAL_CENTER_FRACTION := Vector2(0.5, 0.55)
const STAR_RADIUS: float = 12.0
const ORBITAL_RING_BASE: float = 65.0  # innermost planet ring radius (px)
const ORBITAL_RING_STEP: float = 58.0  # radial gap between orbit rings
const MOON_ORBIT_RADIUS: float = 24.0  # sub-orbit radius for moons around parent
const STATION_SIZE: float = 6.0  # station marker half-size
const BODY_HIT_RADIUS: float = 16.0  # click/hover detection radius
const LABEL_OFFSET: float = 11.0  # px below body dot for label

# ── Colors ────────────────────────────────────────────────────────────────────
const COLOR_BG: Color = Color("#0d1117")
const COLOR_STAR: Color = Color("#f0d060")
const COLOR_PLANET_INHABITED: Color = Color("#44aa66")
const COLOR_PLANET_HABITABLE: Color = Color("#4488aa")
const COLOR_PLANET_BARE: Color = Color("#556677")
const COLOR_MOON: Color = Color("#3a4a55")
const COLOR_OORT: Color = Color("#253040")
const COLOR_STATION: Color = Color("#f0d060")
const COLOR_RING: Color = Color(1.0, 1.0, 1.0, 0.06)
const COLOR_TEXT: Color = Color("#c8d0e0")
const COLOR_TEXT_DIM: Color = Color("#667788")

# ── Navigation state ──────────────────────────────────────────────────────────
var _level: Level = Level.SYSTEM_PICKER
var _systems: Array = []  # Array[Dictionary] from star_map_data.json
var _selected_idx: int = 0  # index into _systems
var _selected_body: Dictionary = {}  # body dict at Level.BODY_ENTRY

# ── Orbital diagram runtime state ─────────────────────────────────────────────
var _orbital_bodies: Array = []  # orbit_bodies for current system
var _orbital_stations: Array = []  # stations for current system
var _body_positions: Dictionary = {}  # body_id -> Vector2
var _station_positions: Dictionary = {}  # station_id -> Vector2
var _hovered_body: String = ""
var _hovered_station: String = ""
var _selected_station: Dictionary = {}  # station clicked in orbital view
var _dirty: bool = true

# ── Visual components (D-169 ImplantPanel library) ────────────────────────────
var _implant_theme = null  # ImplantTheme — loaded at runtime (autoload parse-order rule)
var _picker_panel = null  # ImplantPanel — level 0 system selector
var _picker_nav_row = null  # ImplantDataRow — nav hint text, updated on navigate
var _body_panel = null  # ImplantPanel — level 2 body entry
var _station_panel = null  # ImplantPanel — station mini, shown in level 1 on click
var _screen_header: ImplantHeader = null  # D-169-composed title/hint row (top-left)
var _viewer = null  # AtlasViewer — level 3 heightmap viewer (#835)


func _ready() -> void:
	anchor_right = 1.0
	anchor_bottom = 1.0
	grow_horizontal = Control.GROW_DIRECTION_BOTH
	grow_vertical = Control.GROW_DIRECTION_BOTH
	visible = false
	mouse_filter = Control.MOUSE_FILTER_STOP

	# D-170: Register with HUD layer groups
	HudGroups.register(self, APP_PATH)
	HudGroups.app_changed.connect(_on_app_changed)

	_implant_theme = load("res://ui/implant/default_implant.tres")

	_load_system_list()
	_build_screen_header()
	_build_picker_panel()
	_build_body_panel()
	_build_station_panel()
	_build_heightmap_viewer()
	_show_level(Level.SYSTEM_PICKER)


func _process(_delta: float) -> void:
	if not visible:
		return
	if _dirty:
		queue_redraw()
		_dirty = false


## Toggle atlas panel. Called from main.gd on KEY_A.
func toggle_visible() -> void:
	HudGroups.toggle_app(APP_PATH, HudGroups.Mode.FULLSCREEN)


## Called from main.gd when insert state changes.
func set_insert_active(active: bool) -> void:
	if not active and HudGroups.is_app_active(APP_PATH):
		HudGroups.close_app()


func _on_app_changed(app_path: String, mode: int) -> void:
	if app_path != APP_PATH:
		return
	if mode == HudGroups.Mode.FULLSCREEN:
		visible = true
		_dirty = true
	else:
		visible = false


# =============================================================================
# Data loading
# =============================================================================


func _load_system_list() -> void:
	if not FileAccess.file_exists(STAR_MAP_DATA):
		push_warning("AtlasPanel: %s not found" % STAR_MAP_DATA)
		return
	var file := FileAccess.open(STAR_MAP_DATA, FileAccess.READ)
	if file == null:
		return
	var parsed: Variant = JSON.parse_string(file.get_as_text())
	file.close()
	if not (parsed is Dictionary):
		return
	for node: Dictionary in parsed.get("nodes", []):
		if not node.get("system_id", "").is_empty():
			_systems.append(node)
	_systems.sort_custom(
		func(a: Dictionary, b: Dictionary) -> bool:
			var na: String = a.get("proper_name", a.get("system_id", ""))
			var nb: String = b.get("proper_name", b.get("system_id", ""))
			return na < nb
	)


func _current_system() -> Dictionary:
	if _systems.is_empty():
		return {}
	_selected_idx = clampi(_selected_idx, 0, _systems.size() - 1)
	return _systems[_selected_idx]


func _enter_orbital_diagram() -> void:
	var sys: Dictionary = _current_system()
	_orbital_bodies = sys.get("orbit_bodies", [])
	_orbital_stations = sys.get("stations", [])
	_hovered_body = ""
	_hovered_station = ""
	_selected_station = {}
	_compute_body_positions()
	if _station_panel:
		_station_panel.visible = false
	_show_level(Level.ORBITAL_DIAGRAM)


func _enter_body_entry(body: Dictionary) -> void:
	_selected_body = body
	_rebuild_body_panel()
	_show_level(Level.BODY_ENTRY)


func _open_heightmap_viewer() -> void:
	if _viewer == null:
		return
	_viewer.show_body(_selected_body, _current_system())
	_show_level(Level.HEIGHTMAP_VIEWER)


# =============================================================================
# Orbital geometry
# =============================================================================


func _compute_body_positions() -> void:
	_body_positions.clear()
	_station_positions.clear()

	var sz: Vector2 = get_rect().size
	# Fall back to design-time size if rect not available yet
	if sz == Vector2.ZERO:
		sz = Vector2(1280.0, 720.0)
	var center: Vector2 = sz * ORBITAL_CENTER_FRACTION

	# Separate top-level bodies (no parent) from moons
	var top_bodies: Array = []
	for b: Dictionary in _orbital_bodies:
		if b.get("parent_body_id") == null:
			top_bodies.append(b)
	top_bodies.sort_custom(
		func(a: Dictionary, b: Dictionary) -> bool:
			return int(a.get("orbit_index", 0)) < int(b.get("orbit_index", 0))
	)

	# Group by orbit_index and distribute evenly on each ring
	var by_orbit: Dictionary = {}
	for b: Dictionary in top_bodies:
		var idx: int = int(b.get("orbit_index", 0))
		if not by_orbit.has(idx):
			by_orbit[idx] = []
		by_orbit[idx].append(b)

	for orbit_idx: int in by_orbit:
		var ring_bodies: Array = by_orbit[orbit_idx]
		var ring_r: float = ORBITAL_RING_BASE + (orbit_idx - 1) * ORBITAL_RING_STEP
		var count: int = ring_bodies.size()
		for i: int in range(count):
			var b: Dictionary = ring_bodies[i]
			var bid: String = str(b.get("body_id", ""))
			if bid.is_empty():
				continue
			var angle: float
			if count == 1:
				angle = -PI / 2.0  # top position (12 o'clock)
			else:
				angle = -PI / 2.0 + TAU * float(i) / float(count)
			_body_positions[bid] = center + Vector2(cos(angle), sin(angle)) * ring_r

	# Place moons near their parent body. Moons per parent count drives the
	# angular spacing — a hard-coded divisor made the 5th+ moon overlap moon 1
	# and become unclickable on gas giants with many satellites (review #1).
	var moons_by_parent: Dictionary = {}
	for b: Dictionary in _orbital_bodies:
		var parent_id: Variant = b.get("parent_body_id")
		if parent_id == null:
			continue
		var key: String = str(parent_id)
		if not moons_by_parent.has(key):
			moons_by_parent[key] = []
		moons_by_parent[key].append(b)
	for parent_key: String in moons_by_parent:
		if not _body_positions.has(parent_key):
			continue
		var siblings: Array = moons_by_parent[parent_key]
		siblings.sort_custom(
			func(a: Dictionary, b: Dictionary) -> bool:
				return int(a.get("orbit_index", 0)) < int(b.get("orbit_index", 0))
		)
		var parent_pos: Vector2 = _body_positions[parent_key]
		var count: int = siblings.size()
		for i: int in range(count):
			var moon: Dictionary = siblings[i]
			var moon_id: String = str(moon.get("body_id", ""))
			if moon_id.is_empty():
				continue
			var angle: float = -PI / 2.0 + TAU * float(i) / float(count)
			_body_positions[moon_id] = (
				parent_pos + Vector2(cos(angle), sin(angle)) * MOON_ORBIT_RADIUS
			)

	# Place stations near their parent body (offset right + slightly up)
	for s: Dictionary in _orbital_stations:
		var station_id: String = str(s.get("station_id", ""))
		if station_id.is_empty():
			continue
		var parent_id: Variant = s.get("orbits_body_id")
		var station_parent_pos: Vector2
		if parent_id != null and _body_positions.has(str(parent_id)):
			station_parent_pos = _body_positions[str(parent_id)]
		else:
			station_parent_pos = center  # fallback to star position
		_station_positions[station_id] = station_parent_pos + Vector2(20.0, -10.0)


# =============================================================================
# Drawing
# =============================================================================


func _draw() -> void:
	match _level:
		Level.SYSTEM_PICKER:
			_draw_picker_bg()
		Level.ORBITAL_DIAGRAM:
			_draw_orbital()
		Level.BODY_ENTRY:
			_draw_body_bg()
		Level.HEIGHTMAP_VIEWER:
			pass  # AtlasViewer draws its own background


func _draw_picker_bg() -> void:
	draw_rect(Rect2(Vector2.ZERO, get_rect().size), COLOR_BG)


func _draw_body_bg() -> void:
	draw_rect(Rect2(Vector2.ZERO, get_rect().size), COLOR_BG)


func _draw_orbital() -> void:
	var sz: Vector2 = get_rect().size
	var center: Vector2 = sz * ORBITAL_CENTER_FRACTION

	draw_rect(Rect2(Vector2.ZERO, sz), COLOR_BG)

	# Orbit rings for top-level bodies
	_draw_orbit_rings(center)

	# Star glow + body
	draw_circle(center, STAR_RADIUS + 4.0, Color(COLOR_STAR.r, COLOR_STAR.g, COLOR_STAR.b, 0.18))
	draw_circle(center, STAR_RADIUS, COLOR_STAR)

	# Station markers (behind body dots)
	_draw_stations()

	# Body dots + labels
	_draw_bodies()


func _build_screen_header() -> void:
	# D-169: the top-of-screen title / hint composes from ImplantHeader so the
	# implant theme drives its fonts and semantic colors. Review #4 flagged the
	# original draw_string() approach as a theme-swap invariant violation.
	_screen_header = ImplantHeader.new()
	_screen_header.position = Vector2(PANEL_MARGIN, 16.0)
	_screen_header.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(_screen_header)
	if _implant_theme:
		_screen_header.apply_implant_theme(_implant_theme)


func _refresh_screen_header() -> void:
	if _screen_header == null:
		return
	var title: String = ""
	var hint: String = ""
	match _level:
		Level.SYSTEM_PICKER:
			title = "ATLAS — SYSTEM SELECTION"
			hint = "select a system · ◄ ► cycle · enter open orbital view · esc close"
		Level.ORBITAL_DIAGRAM:
			var sys: Dictionary = _current_system()
			var sys_name: String = str(sys.get("proper_name", sys.get("system_id", "—")))
			title = "ATLAS — ORBITAL VIEW · " + sys_name.to_upper()
			var star_type: String = str(sys.get("star_type", ""))
			var top_count: int = 0
			for b: Dictionary in _orbital_bodies:
				if b.get("parent_body_id") == null:
					top_count += 1
			var subtitle: String = ""
			if not star_type.is_empty():
				subtitle = star_type + " · "
			subtitle += "%d orbital bodies · %d stations" % [top_count, _orbital_stations.size()]
			hint = subtitle + "  ·  click body → atlas entry  ·  esc back"
		Level.BODY_ENTRY:
			var sys2: Dictionary = _current_system()
			var sys2_name: String = str(sys2.get("proper_name", sys2.get("system_id", "—")))
			title = "ATLAS — BODY ENTRY · " + sys2_name.to_upper()
			hint = "enter view atlas · esc back to orbital"
		Level.HEIGHTMAP_VIEWER:
			# Viewer owns its own header while active.
			title = ""
			hint = ""
	_screen_header.set_content(title, hint)
	_screen_header.visible = (_level != Level.HEIGHTMAP_VIEWER)


func _draw_orbit_rings(center: Vector2) -> void:
	# Draw one ring per unique orbit_index of top-level bodies
	var seen_orbits: Dictionary = {}
	for b: Dictionary in _orbital_bodies:
		if b.get("parent_body_id") != null:
			continue
		var idx: int = int(b.get("orbit_index", 0))
		if seen_orbits.has(idx):
			continue
		seen_orbits[idx] = true
		var r: float = ORBITAL_RING_BASE + (idx - 1) * ORBITAL_RING_STEP
		draw_arc(center, r, 0.0, TAU, 64, COLOR_RING, 0.5, true)


func _draw_bodies() -> void:
	var font := get_theme_default_font()
	for b: Dictionary in _orbital_bodies:
		var bid: String = str(b.get("body_id", ""))
		if bid.is_empty() or not _body_positions.has(bid):
			continue
		var pos: Vector2 = _body_positions[bid]
		var body_type: String = b.get("body_type", "")
		var atmo: String = b.get("atmosphere", "none")
		var inhabited: bool = bool(b.get("inhabited", false))

		var color: Color
		var radius: float
		match body_type:
			"moon":
				color = COLOR_MOON
				radius = 3.5
			"oort_cloud":
				# Oort cloud shown as a faint dashed circle suggestion, not a dot
				color = COLOR_OORT
				radius = 2.0
			_:
				if inhabited:
					color = COLOR_PLANET_INHABITED
					radius = 6.0
				elif atmo in ["breathable", "standard"]:
					color = COLOR_PLANET_HABITABLE
					radius = 5.5
				else:
					color = COLOR_PLANET_BARE
					radius = 4.5

		# Hover highlight ring
		if bid == _hovered_body:
			draw_arc(pos, radius + 5.0, 0.0, TAU, 20, Color(1.0, 1.0, 1.0, 0.25), 1.0, true)

		draw_circle(pos, radius, color)

		# Label: always for inhabited, on hover otherwise
		var label: String = b.get("proper_name", bid) if b.get("proper_name") else bid
		var show_label: bool = inhabited or bid == _hovered_body
		if show_label:
			var lcolor: Color = COLOR_TEXT if bid == _hovered_body else COLOR_TEXT_DIM
			var lsz: Vector2 = font.get_string_size(label, HORIZONTAL_ALIGNMENT_LEFT, -1, 9)
			var lpos: Vector2 = pos + Vector2(-lsz.x / 2.0, radius + LABEL_OFFSET)
			draw_string(font, lpos, label, HORIZONTAL_ALIGNMENT_LEFT, -1, 9, lcolor)


func _draw_stations() -> void:
	var font := get_theme_default_font()
	for s: Dictionary in _orbital_stations:
		var sid: String = str(s.get("station_id", ""))
		if sid.is_empty() or not _station_positions.has(sid):
			continue
		var pos: Vector2 = _station_positions[sid]
		var half: float = STATION_SIZE / 2.0
		var rect: Rect2 = Rect2(pos - Vector2(half, half), Vector2(STATION_SIZE, STATION_SIZE))

		if sid == _hovered_station:
			draw_rect(
				Rect2(rect.position - Vector2(3, 3), rect.size + Vector2(6, 6)),
				Color(1.0, 1.0, 1.0, 0.18)
			)

		draw_rect(rect, COLOR_STATION)

		# Label on hover
		if sid == _hovered_station:
			var label: String = s.get("proper_name", sid) if s.get("proper_name") else sid
			var lsz: Vector2 = font.get_string_size(label, HORIZONTAL_ALIGNMENT_LEFT, -1, 9)
			draw_string(
				font,
				pos + Vector2(-lsz.x / 2.0, half + 8.0),
				label,
				HORIZONTAL_ALIGNMENT_LEFT,
				-1,
				9,
				COLOR_TEXT_DIM
			)


# =============================================================================
# Input
# =============================================================================


func _gui_input(event: InputEvent) -> void:
	if event is InputEventKey and (event as InputEventKey).pressed and not event.is_echo():
		_handle_key(event as InputEventKey)
	elif _level == Level.ORBITAL_DIAGRAM:
		if event is InputEventMouseButton and (event as InputEventMouseButton).pressed:
			_handle_orbital_click((event as InputEventMouseButton).position)
		elif event is InputEventMouseMotion:
			_handle_orbital_hover((event as InputEventMouseMotion).position)


func _handle_key(event: InputEventKey) -> void:
	if _level == Level.HEIGHTMAP_VIEWER:
		# Viewer handles its own input via _gui_input; don't double-process.
		return
	match event.keycode:
		KEY_ESCAPE:
			_navigate_back()
		KEY_B:
			HudGroups.close_app()
		KEY_LEFT:
			if _level == Level.SYSTEM_PICKER:
				_navigate_system(-1)
		KEY_RIGHT:
			if _level == Level.SYSTEM_PICKER:
				_navigate_system(1)
		KEY_ENTER, KEY_KP_ENTER:
			if _level == Level.SYSTEM_PICKER:
				_enter_orbital_diagram()
			elif _level == Level.BODY_ENTRY:
				_open_heightmap_viewer()


func _navigate_back() -> void:
	match _level:
		Level.SYSTEM_PICKER:
			HudGroups.close_app()
		Level.ORBITAL_DIAGRAM:
			_show_level(Level.SYSTEM_PICKER)
		Level.BODY_ENTRY:
			_show_level(Level.ORBITAL_DIAGRAM)
		Level.HEIGHTMAP_VIEWER:
			_show_level(Level.BODY_ENTRY)


func _navigate_system(delta: int) -> void:
	if _systems.is_empty():
		return
	_selected_idx = wrapi(_selected_idx + delta, 0, _systems.size())
	_rebuild_picker_panel()
	_refresh_screen_header()


func _handle_orbital_click(pos: Vector2) -> void:
	# Bodies take priority over stations
	var bid: String = _find_nearest_body(pos)
	if not bid.is_empty():
		for b: Dictionary in _orbital_bodies:
			if str(b.get("body_id", "")) == bid:
				_enter_body_entry(b)
				return

	# Station click → show mini panel (no drill-down per D-191)
	var sid: String = _find_nearest_station(pos)
	if not sid.is_empty():
		for s: Dictionary in _orbital_stations:
			if str(s.get("station_id", "")) == sid:
				_selected_station = s
				_rebuild_station_panel()
				if _station_panel:
					_station_panel.visible = true
				return

	# Click on empty space — dismiss station panel
	_selected_station = {}
	if _station_panel:
		_station_panel.visible = false
	_dirty = true


func _handle_orbital_hover(pos: Vector2) -> void:
	var new_body: String = _find_nearest_body(pos)
	var new_station: String = "" if not new_body.is_empty() else _find_nearest_station(pos)
	if new_body != _hovered_body or new_station != _hovered_station:
		_hovered_body = new_body
		_hovered_station = new_station
		_dirty = true


func _find_nearest_body(pos: Vector2) -> String:
	var best_dist: float = BODY_HIT_RADIUS
	var best_id: String = ""
	for bid: String in _body_positions:
		var d: float = pos.distance_to(_body_positions[bid])
		if d < best_dist:
			best_dist = d
			best_id = bid
	return best_id


func _find_nearest_station(pos: Vector2) -> String:
	var best_dist: float = BODY_HIT_RADIUS
	var best_id: String = ""
	for sid: String in _station_positions:
		var d: float = pos.distance_to(_station_positions[sid])
		if d < best_dist:
			best_dist = d
			best_id = sid
	return best_id


# =============================================================================
# Level switching — show/hide panels
# =============================================================================


func _show_level(level: Level) -> void:
	_level = level
	_dirty = true

	if _picker_panel:
		_picker_panel.visible = (level == Level.SYSTEM_PICKER)
	if _body_panel:
		_body_panel.visible = (level == Level.BODY_ENTRY)
	# Station panel managed separately — remains hidden until a station click
	if _station_panel and level != Level.ORBITAL_DIAGRAM:
		_station_panel.visible = false
	if _viewer:
		_viewer.visible = (level == Level.HEIGHTMAP_VIEWER)

	_refresh_screen_header()
	queue_redraw()


# =============================================================================
# Panel construction — D-169 ImplantPanel component library
# =============================================================================


func _build_picker_panel() -> void:
	_picker_panel = ImplantPanel.new()
	_picker_panel.name = "PickerPanel"
	_picker_panel.theme_resource = _implant_theme
	_picker_panel.custom_minimum_size.x = PANEL_WIDTH
	_picker_panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_picker_panel.position = Vector2(PANEL_MARGIN, 60.0)
	add_child(_picker_panel)
	_rebuild_picker_panel()


func _rebuild_picker_panel() -> void:
	if not _picker_panel:
		return
	_picker_panel.clear()

	var sys: Dictionary = _current_system()
	var sys_name: String = sys.get("proper_name", sys.get("system_id", "—"))
	var sys_id: String = sys.get("system_id", "")
	var sector: String = sys.get("geographic_sector", "").replace("_", " ").to_upper()
	var czone: String = sys.get("currency_zone", "").replace("_", " ")
	var total: int = _systems.size()

	_picker_panel.add_component(ImplantHeader.new("ATLAS", sys_name))
	_picker_panel.add_component(ImplantSeparator.new())

	_picker_nav_row = ImplantDataRow.new("◄ ►  [%d / %d]" % [_selected_idx + 1, total])
	_picker_panel.add_component(_picker_nav_row)

	_picker_panel.add_component(ImplantSeparator.new())
	_picker_panel.add_component(ImplantDataRow.new(sys_id))
	if not sector.is_empty():
		_picker_panel.add_component(ImplantDataRow.new(sector + " CORRIDOR"))
	if not czone.is_empty():
		_picker_panel.add_component(ImplantDataRow.new("currency  " + czone))
	_picker_panel.add_component(ImplantDataRow.new(sys.get("bodies", "—")))
	_picker_panel.add_component(ImplantDataRow.new("pop  " + sys.get("population", "—")))

	_picker_panel.add_component(ImplantSeparator.new())
	_picker_panel.add_component(ImplantTextBlock.new("enter  open orbital map"))
	_picker_panel.add_component(ImplantTextBlock.new("esc    close atlas"))

	_dirty = true


func _build_body_panel() -> void:
	_body_panel = ImplantPanel.new()
	_body_panel.name = "BodyPanel"
	_body_panel.theme_resource = _implant_theme
	_body_panel.custom_minimum_size.x = PANEL_WIDTH
	_body_panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_body_panel.position = Vector2(PANEL_MARGIN, 60.0)
	_body_panel.visible = false
	add_child(_body_panel)


func _rebuild_body_panel() -> void:
	if not _body_panel:
		return
	_body_panel.clear()

	var b: Dictionary = _selected_body
	var bid: String = b.get("body_id", "")
	var name_str: String = b.get("proper_name", "") if b.get("proper_name") else bid
	var body_type: String = b.get("body_type", "").replace("_", " ").to_upper()
	var mass_class: String = b.get("mass_class", "") if b.get("mass_class") else ""
	var atmo: String = b.get("atmosphere", "none") if b.get("atmosphere") else "none"
	var inhabited: bool = bool(b.get("inhabited", false))
	var pop: int = int(b.get("population", 0))
	var has_heightmap: bool = b.get("terrain_reference") != null

	var sys: Dictionary = _current_system()
	var sys_name: String = sys.get("proper_name", sys.get("system_id", "—"))

	_body_panel.add_component(ImplantHeader.new(name_str, sys_name + " system"))
	_body_panel.add_component(ImplantSeparator.new())

	var type_line: String = body_type
	if not mass_class.is_empty():
		type_line += " · " + mass_class.replace("_", " ").to_upper()
	_body_panel.add_component(ImplantDataRow.new(type_line))
	_body_panel.add_component(ImplantDataRow.new("atmosphere  " + atmo))

	if inhabited:
		_body_panel.add_component(ImplantSeparator.new())
		_body_panel.add_component(ImplantDataRow.new("population  " + _format_pop(pop)))

	_body_panel.add_component(ImplantSeparator.new())

	if has_heightmap:
		_body_panel.add_component(ImplantTextBlock.new("enter  view heightmap atlas"))
	else:
		_body_panel.add_component(ImplantTextBlock.new("atlas data pending  (#839)"))

	_body_panel.add_component(ImplantTextBlock.new("esc    back to orbital view"))


func _build_station_panel() -> void:
	_station_panel = ImplantPanel.new()
	_station_panel.name = "StationPanel"
	_station_panel.theme_resource = _implant_theme
	_station_panel.custom_minimum_size.x = PANEL_WIDTH
	_station_panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_station_panel.position = Vector2(PANEL_MARGIN, 60.0)
	_station_panel.visible = false
	add_child(_station_panel)


func _build_heightmap_viewer() -> void:
	_viewer = AtlasViewer.new()
	_viewer.name = "AtlasViewer"
	_viewer.visible = false
	add_child(_viewer)
	_viewer.back_pressed.connect(_on_viewer_back)
	_viewer.economics_link_requested.connect(_on_viewer_economics_link)


func _on_viewer_back() -> void:
	_show_level(Level.BODY_ENTRY)


func _on_viewer_economics_link(system_id: String) -> void:
	economics_link_requested.emit(system_id)
	# Close the atlas; main.gd will open economics monitor in its place.
	HudGroups.close_app()


func _rebuild_station_panel() -> void:
	if not _station_panel:
		return
	_station_panel.clear()

	if _selected_station.is_empty():
		return

	var s: Dictionary = _selected_station
	var s_name: String = (
		s.get("proper_name", "") if s.get("proper_name") else s.get("station_id", "—")
	)
	var s_type: String = s.get("station_type", "").replace("_", " ").to_upper()
	var gov: String = s.get("governance_type", "") if s.get("governance_type") else ""
	var role: String = s.get("economic_role", "") if s.get("economic_role") else ""
	var sys: Dictionary = _current_system()
	var czone: String = sys.get("currency_zone", "") if sys.get("currency_zone") else "—"
	czone = czone.replace("_", " ")

	_station_panel.add_component(ImplantHeader.new(s_name, s_type + " STATION"))
	_station_panel.add_component(ImplantSeparator.new())
	if not gov.is_empty():
		_station_panel.add_component(
			ImplantDataRow.new("operator   " + gov.replace("_", " ").to_upper())
		)
	if not role.is_empty():
		_station_panel.add_component(ImplantDataRow.new("function   " + role.replace("_", " ")))
	_station_panel.add_component(ImplantDataRow.new("currency   " + czone))
	_station_panel.add_component(ImplantSeparator.new())
	_station_panel.add_component(ImplantTextBlock.new("station atlas  deferred"))
	_station_panel.add_component(ImplantTextBlock.new("esc  back"))


# =============================================================================
# Helpers
# =============================================================================


func _format_pop(pop: int) -> String:
	if pop <= 0:
		return "0"
	var s: String = str(pop)
	var result: String = ""
	var count: int = 0
	for i: int in range(s.length() - 1, -1, -1):
		if count > 0 and count % 3 == 0:
			result = "," + result
		result = s[i] + result
		count += 1
	return result