extends Control

# Dialogue box — D-061: bottom screen, max 20% height, no portraits.
# InsertOverlay (CanvasLayer 10, z-layer 6) — diegetic, insert-styled.
# NPC speech top, player response options below, left-aligned.
# Max 3 visible options. No close button — walk-away (WASD) or option select only.
# Auto-pause in single-player when dialogue is open (D-061).
# Sprint 7: UI skeleton with mock data. Server wiring deferred to #305.

signal option_selected(index: int, text: String)
signal dialogue_dismissed  # Walk-away or conversation end

@onready var panel: PanelContainer = $PanelContainer
@onready var npc_speech: RichTextLabel = $PanelContainer/MarginContainer/VBoxContainer/NpcSpeech
@onready var options_container: VBoxContainer = $PanelContainer/MarginContainer/VBoxContainer/OptionsContainer

var _is_showing: bool = false
var _active_tween: Tween = null
var _option_buttons: Array[Button] = []
var _npc_name: String = ""
var _dialogue_id: int = 0  # Tracks current dialogue to prevent consume-once race

const FADE_IN: float = 0.2
const FADE_OUT: float = 0.3  # D-064: 300ms fade on walk-away
const MAX_OPTIONS: int = 3   # D-061: max 3 response options visible
const MAX_HEIGHT_RATIO: float = 0.2   # D-061: max 20% viewport height
const MAX_WIDTH_PX: float = 832.0     # D-061: max-width cap (~65% of 1280)

# D-064: movement actions that trigger walk-away
const _WALK_AWAY_ACTIONS: Array[StringName] = [
	&"move_north", &"move_south", &"move_east", &"move_west",
	&"move_northeast", &"move_southeast", &"move_southwest", &"move_northwest",
]


func _ready() -> void:
	panel.modulate.a = 0.0
	visible = false
	_is_showing = false
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	_update_layout()
	get_viewport().size_changed.connect(_update_layout)


func _unhandled_input(event: InputEvent) -> void:
	if not _is_showing:
		return

	# D-064: WASD during dialogue → walk-away, 300ms fade
	if event is InputEventKey and event.pressed:
		for action in _WALK_AWAY_ACTIONS:
			if event.is_action_pressed(action):
				hide_dialogue()
				dialogue_dismissed.emit()
				return


# Responsive layout — clamps width to MAX_WIDTH_PX and height to 20% viewport.
func _update_layout() -> void:
	var vp := get_viewport_rect().size
	var max_h := vp.y * MAX_HEIGHT_RATIO
	var w := minf(MAX_WIDTH_PX, vp.x * 0.65)
	panel.offset_left = -w / 2.0
	panel.offset_right = w / 2.0
	panel.offset_top = -max_h


# Show dialogue with NPC speech and response options.
# npc_name: who is speaking (displayed as prefix)
# speech: the NPC's dialogue text
# options: Array of Strings — player response choices (max 3 shown)
func show_dialogue(npc_name: String, speech: String, options: Array = []) -> void:
	_npc_name = npc_name
	_dialogue_id += 1

	# NPC speech — name prefix in bold
	if npc_name.is_empty():
		npc_speech.text = speech
	else:
		npc_speech.text = "[b]%s:[/b] %s" % [npc_name, speech]

	# Clear old option buttons
	_clear_options()

	# Build response option buttons (max 3)
	var count := mini(options.size(), MAX_OPTIONS)
	for i in range(count):
		var btn := Button.new()
		btn.text = options[i]
		btn.alignment = HORIZONTAL_ALIGNMENT_LEFT
		btn.flat = true
		btn.mouse_default_cursor_shape = Control.CURSOR_POINTING_HAND
		# Insert-styled colors from shared palette (D-048/D-056)
		btn.add_theme_color_override("font_color", Constants.INSERT_COLOR_TEXT)
		btn.add_theme_color_override("font_hover_color", Constants.INSERT_COLOR_HOVER)
		btn.add_theme_color_override("font_pressed_color", Constants.INSERT_COLOR_ACTIVE)
		var idx := i
		btn.pressed.connect(func(): _on_option_pressed(idx))
		options_container.add_child(btn)
		_option_buttons.append(btn)

	# Show with fade
	visible = true
	mouse_filter = Control.MOUSE_FILTER_STOP
	_is_showing = true

	# D-061: auto-pause in single-player when dialogue opens
	SimBridge.send_input({"action": InputMapper.Action.PAUSE, "timestamp_msec": Time.get_ticks_msec()})

	if _active_tween and _active_tween.is_valid():
		_active_tween.kill()
	_active_tween = create_tween()
	_active_tween.tween_property(panel, "modulate:a", 1.0, FADE_IN)


# Hide dialogue with fade (D-064: 300ms)
func hide_dialogue() -> void:
	if not _is_showing:
		return

	_is_showing = false
	mouse_filter = Control.MOUSE_FILTER_IGNORE

	# D-061: unpause when dialogue closes
	SimBridge.send_input({"action": InputMapper.Action.PAUSE, "timestamp_msec": Time.get_ticks_msec()})

	if _active_tween and _active_tween.is_valid():
		_active_tween.kill()
	_active_tween = create_tween()
	_active_tween.tween_property(panel, "modulate:a", 0.0, FADE_OUT)
	_active_tween.tween_callback(func():
		visible = false
		_clear_options()
	)


func is_dialogue_active() -> bool:
	return _is_showing


func get_dialogue_id() -> int:
	return _dialogue_id


func _on_option_pressed(index: int) -> void:
	if index < _option_buttons.size():
		option_selected.emit(index, _option_buttons[index].text)
	hide_dialogue()


func _clear_options() -> void:
	for btn in _option_buttons:
		if is_instance_valid(btn):
			btn.queue_free()
	_option_buttons.clear()