extends Control

# Interaction prompt — displays available interaction verb for nearby entity.
# Server-driven: shows when GameState.nearby_interactions is non-empty,
# hides when empty. No game logic — pure display layer.
#
# v0.1: Single-line "E - Talk" (first verb on nearest entity)
# v0.2: Will be replaced/extended with radial verb menu.
# Public interface: get_interaction_target(), get_selected_verb()

const FADE_IN: float = 0.15
const FADE_OUT: float = 0.15

var _is_showing: bool = false
var _active_tween: Tween = null
var _current_target_id: int = -1
# OQ-07 (#522): when false, prompt is suppressed (z-layer 6 insert overlay only)
var _insert_active: bool = true

var _panel: ImplantPanel
var _row: ImplantDataRow


func _ready() -> void:
	modulate.a = 0.0
	visible = false
	_is_showing = false
	mouse_filter = Control.MOUSE_FILTER_IGNORE

	var theme_res := load("res://ui/implant/default_implant.tres") as ImplantTheme

	_panel = ImplantPanel.new()
	_panel.name = "PromptPanel"
	_panel.theme_resource = theme_res
	_panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_panel.set_anchors_preset(Control.PRESET_FULL_RECT)
	add_child(_panel)

	_row = ImplantDataRow.new("", theme_res.text_primary if theme_res else Color.WHITE)
	_row.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_panel.add_component(_row)


func _process(_delta: float) -> void:
	# OQ-07: insert off means no verb labels (z-layer 6 insert overlay suppressed)
	if not _insert_active:
		if _is_showing:
			_hide_prompt()
		return
	var interactions: Array = GameState.nearby_interactions
	if interactions.size() > 0:
		_show_prompt(interactions[0])
	elif _is_showing:
		_hide_prompt()


func _show_prompt(interaction: Dictionary) -> void:
	var target_id: int = interaction.get("entity_id", -1)
	var verbs: Array = interaction.get("verbs", [])

	if verbs.is_empty():
		if _is_showing:
			_hide_prompt()
		return

	# v0.1: pick first verb (sorted by priority from server)
	var verb_label: String = verbs[0].get("label", "")
	var display_text: String = "E - %s" % verb_label

	if _current_target_id != target_id or _row.text != display_text:
		_row.set_content(display_text)
		_current_target_id = target_id

	if not _is_showing:
		visible = true
		_is_showing = true
		if _active_tween and _active_tween.is_valid():
			_active_tween.kill()
		_active_tween = create_tween()
		_active_tween.tween_property(self, "modulate:a", 1.0, FADE_IN)


func _hide_prompt() -> void:
	if not _is_showing:
		return
	_is_showing = false
	_current_target_id = -1
	if _active_tween and _active_tween.is_valid():
		_active_tween.kill()
	_active_tween = create_tween()
	_active_tween.tween_property(self, "modulate:a", 0.0, FADE_OUT)
	_active_tween.tween_callback(func(): visible = false)


## Returns the current interaction target entity ID, or -1 if no interaction.
func get_interaction_target() -> int:
	return _current_target_id


## OQ-07 (#522): insert off hides prompt (diegetic: no insert data on z-layer 6).
## Cursor shape changes still fire on cursor_renderer.gd.
func set_insert_active(active: bool) -> void:
	_insert_active = active
	if not active and _is_showing:
		_hide_prompt()


## Returns the selected verb kind (v0.1: first verb on nearest, v0.2: radial selection).
func get_selected_verb() -> String:
	var interactions: Array = GameState.nearby_interactions
	if interactions.is_empty():
		return ""
	var verbs: Array = interactions[0].get("verbs", [])
	if verbs.is_empty():
		return ""
	return verbs[0].get("kind", "")