extends PanelContainer

# 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()

@onready var prompt_label: Label = $MarginContainer/PromptLabel

var _is_showing: bool = false
var _active_tween: Tween = null
var _current_target_id: int = -1

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

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

func _process(_delta: float) -> void:
	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 prompt_label.text != display_text:
		prompt_label.text = 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

## 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", "")