extends Control

# Dialogue box — D-061: bottom screen, max 20% height, no portraits.
# #535: Unified conversation log — player dialogue and overheard NPC-NPC conversations
# flow chronologically. Oldest at top, scrolls up. Options at bottom.
#
# InsertOverlay (CanvasLayer 10, z-layer 6) — diegetic, insert-styled.
# D-063: Confrontation options render italic, trigger monologue beat before send.
# D-064: Walk-away via WASD dismisses active conversation (log entries persist).
#        dialogue_active held until fade completes (D-064 auto-pause spec).
# D-078: Overheard NPC-NPC lines prefixed with ┃ glyph + desaturated colours.

signal option_selected(response_id: String, text: String)
signal dialogue_dismissed  # Walk-away or conversation end
signal confrontation_monologue(text: String, duration: float)  # D-063: beat monologue
signal pause_requested   # D-061: auto-pause — main.gd routes through input recording (#507)
signal unpause_requested  # D-061: auto-unpause

@onready var panel: PanelContainer = $PanelContainer
@onready var dialogue_log: RichTextLabel = $PanelContainer/MarginContainer/VBoxContainer/DialogueLog
@onready var options_container: VBoxContainer = $PanelContainer/MarginContainer/VBoxContainer/OptionsContainer

# -- Log state --
# Entry format: {speaker, target, text, is_passive, pinned, timestamp_msec}
# pinned entries do not expire (active conversation lines, Araminta review).
var _log_entries: Array[Dictionary] = []
var _in_player_conversation: bool = false
var _log_dirty: bool = false  # Dirty flag — prevents per-frame O(n) BBCode rebuild (Hoshe #1)

# -- Option state --
var _option_controls: Array[Control] = []
var _option_response_ids: Array[String] = []
var _option_texts: Array[String] = []
var _option_is_confrontation: Array[bool] = []
var _npc_name: String = ""

# -- UI state --
var _is_showing: bool = false
var _active_tween: Tween = null
var _beat_tween: Tween = null  # D-063: confrontation beat delay

# -- Theme (loaded from data/dialogue-theme.yaml) --
var _player_color: Color = Color("#e0e8ff")
var _npc_colors: Array[Color] = []
var _arrow_color: Color = Color("#8890a0")
var _speech_color: Color = Color("#c8d0e0")
var _passive_opacity: float = 0.9
var _entry_lifetime: float = 15.0
var _entry_fade: float = 3.0

const THEME_PATH: String = "res://data/dialogue-theme.yaml"

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 = Constants.DIALOGUE_MAX_WIDTH  # D-076: 640px (OQ-29)
const CONFRONTATION_BEAT_DURATION: float = 1.5  # D-063: pause before sending
const CONFRONTATION_DIM_ALPHA: float = 0.7  # D-063: dialogue box dims during beat
const CONFRONTATION_MONOLOGUE_KEY: String = "dialogue.confrontation_beat"
const PLAYER_NAME: String = "You"
const PASSIVE_GLYPH: String = "\u2503 "  # ┃ prefix for overheard lines (Araminta review)
const PASSIVE_DESATURATION: float = 0.4  # Desaturate passive name colours by this factor
const MIN_CONTRAST_LUMINANCE: float = 0.25  # Floor for name colour brightness against dark BG

# 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
	_load_theme()
	_update_layout()
	get_viewport().size_changed.connect(_update_layout)


func _process(_delta: float) -> void:
	_expire_entries()
	if _log_dirty:
		_log_dirty = false
		_rebuild_log()


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

	# D-064: WASD during active player dialogue → walk-away
	if event is InputEventKey and event.pressed:
		for action in _WALK_AWAY_ACTIONS:
			if event.is_action_pressed(action):
				get_viewport().set_input_as_handled()
				_cancel_beat()
				_end_player_conversation()
				dialogue_dismissed.emit()
				return


# -- Theme loading --

func _load_theme() -> void:
	# Default NPC palette in case file not found
	_npc_colors = [
		Color("#4a9ebb"), Color("#6bc9a6"), Color("#e8c547"), Color("#d49e5d"),
		Color("#b586d4"), Color("#d45d5d"), Color("#5daa7d"), Color("#7daccc"),
	]

	if not FileAccess.file_exists(THEME_PATH):
		push_warning("DialogueBox: theme file not found: %s — using defaults" % THEME_PATH)
		return

	var file := FileAccess.open(THEME_PATH, FileAccess.READ)
	if file == null:
		return
	var text := file.get_as_text()
	file.close()

	var strings := UIStrings._parse_yaml(text)

	if strings.has("player_color"):
		_player_color = Color(strings["player_color"])
	if strings.has("arrow_color"):
		_arrow_color = Color(strings["arrow_color"])
	if strings.has("speech_color"):
		_speech_color = Color(strings["speech_color"])
	if strings.has("passive_opacity"):
		_passive_opacity = float(strings["passive_opacity"])
	if strings.has("entry_lifetime_seconds"):
		_entry_lifetime = float(strings["entry_lifetime_seconds"])
	if strings.has("entry_fade_seconds"):
		_entry_fade = float(strings["entry_fade_seconds"])

	# Load NPC colors from indexed keys (npc_colors.0 through npc_colors.7)
	var loaded_colors: Array[Color] = []
	for i in range(16):  # support up to 16 palette entries
		var key := "npc_colors.%d" % i
		if strings.has(key):
			loaded_colors.append(Color(strings[key]))
	if loaded_colors.size() > 0:
		_npc_colors = loaded_colors


# -- Responsive layout --

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


# -- Log entry management --

## Append a dialogue line to the log.
## speaker/target: display names. text: the spoken line.
## is_passive: true for overheard NPC-NPC (renders with ┃ prefix + desaturated).
## Active conversation entries are pinned (no timeout) while _in_player_conversation.
func append_line(speaker: String, target: String, text: String, is_passive: bool = false) -> void:
	var pinned := not is_passive and _in_player_conversation
	_log_entries.append({
		"speaker": speaker,
		"target": target,
		"text": text,
		"is_passive": is_passive,
		"pinned": pinned,
		"timestamp_msec": Time.get_ticks_msec(),
	})
	_log_dirty = true
	_ensure_visible()


## Append an overheard conversation event (D-078).
func append_conversation_event(event: Dictionary) -> void:
	var speaker: String = event.get("speaker_name", "?")
	var target: String = event.get("target_name", "?")
	var text: String = event.get("occluded_line", "")
	if text.is_empty():
		return
	append_line(speaker, target, text, true)


## Handle conversation_ended — no-op currently (entries expire via timeout).
func on_conversation_ended(_event: Dictionary) -> void:
	pass


## Append the player's chosen response to the log.
func append_player_line(target_npc: String, text: String) -> void:
	append_line(PLAYER_NAME, target_npc, text, false)


## Append an NPC follow-up line (from dialogue_response).
func append_dialogue_response(npc_name: String, text: String) -> void:
	append_line(npc_name, PLAYER_NAME, text, false)


# -- Active player conversation --

## Show dialogue with NPC speech and response options.
## npc_name: who is speaking. speech: the NPC's line. options: player choices.
func show_dialogue(npc_name: String, speech: String, options: Array = []) -> void:
	_npc_name = npc_name
	_cancel_beat()
	_in_player_conversation = true

	# Append NPC's line to the log
	if not speech.is_empty():
		append_line(npc_name, PLAYER_NAME, speech, false)

	# Clear old options and show new ones
	_clear_options()
	_show_options(options)

	# Show panel
	_ensure_visible()
	mouse_filter = Control.MOUSE_FILTER_STOP
	GameState.dialogue_active = true  # D-064: block movement while in conversation

	# D-069: Dialogue dip
	AudioManager.apply_dip("dialogue")

	# D-061: auto-pause — signal to main.gd for input recording (#507)
	pause_requested.emit()


## End active player conversation — clears options but preserves log.
## D-064: dialogue_active held until fade completes.
func _end_player_conversation() -> void:
	_in_player_conversation = false
	_clear_options()
	mouse_filter = Control.MOUSE_FILTER_IGNORE

	# Unpin all entries and reset their timestamps so timeout starts now (Araminta review)
	var now := Time.get_ticks_msec()
	for entry in _log_entries:
		if entry.pinned:
			entry.pinned = false
			entry.timestamp_msec = now
	_log_dirty = true

	# D-069: Clear dialogue/confrontation dip
	AudioManager.clear_dip()

	# D-061: unpause — signal to main.gd for input recording (#507)
	unpause_requested.emit()

	# D-064: dialogue_active stays true — cleared after fade completes in hide callback.
	# If log entries still exist, panel stays visible and entries expire via timeout.
	# If no entries, hide immediately with fade.
	if _log_entries.is_empty():
		hide_dialogue()


## Hide the entire panel with fade.
func hide_dialogue() -> void:
	if not _is_showing:
		return

	if _in_player_conversation:
		_end_player_conversation()
		return  # _end_player_conversation may call hide_dialogue if log is empty

	_is_showing = false

	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
		GameState.dialogue_active = false  # D-064: unblock movement after fade completes
	)


func is_dialogue_active() -> bool:
	return _in_player_conversation or GameState.dialogue_active


func has_active_entries() -> bool:
	return _log_entries.size() > 0 or _in_player_conversation


# -- Options --

func _show_options(options: Array) -> void:
	var sorted_opts: Array = options.duplicate()
	sorted_opts.sort_custom(func(a, b): return a.get("priority", 0) < b.get("priority", 0))
	var count := mini(sorted_opts.size(), MAX_OPTIONS)

	for i in range(count):
		var opt: Dictionary = sorted_opts[i]
		var raw_text: String = opt.get("text", "")
		var is_confrontation: bool = opt.get("confrontation", false)

		var label := RichTextLabel.new()
		label.bbcode_enabled = true
		label.fit_content = true
		label.scroll_active = false
		label.mouse_filter = Control.MOUSE_FILTER_STOP
		label.mouse_default_cursor_shape = Control.CURSOR_POINTING_HAND
		label.add_theme_color_override("default_color", Constants.INSERT_COLOR_TEXT)

		if is_confrontation:
			label.text = "[i]%s[/i]" % raw_text
		else:
			label.text = raw_text

		var idx := i
		label.gui_input.connect(func(event: InputEvent):
			if event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT:
				_on_option_pressed(idx)
		)
		label.mouse_entered.connect(_make_hover_on(label))
		label.mouse_exited.connect(_make_hover_off(label))

		options_container.add_child(label)
		_option_controls.append(label)
		_option_response_ids.append(opt.get("response_id", ""))
		_option_texts.append(raw_text)
		_option_is_confrontation.append(is_confrontation)


func _on_option_pressed(index: int) -> void:
	if index >= _option_controls.size():
		return
	var rid: String = _option_response_ids[index] if index < _option_response_ids.size() else ""
	var text: String = _option_texts[index] if index < _option_texts.size() else ""
	var is_confront: bool = _option_is_confrontation[index] if index < _option_is_confrontation.size() else false

	# Append player's chosen response to the log
	append_player_line(_npc_name, text)

	if is_confront:
		_start_confrontation_beat(rid, text)
	else:
		option_selected.emit(rid, text)
		_end_player_conversation()


# -- Confrontation beat (D-063) --

func _start_confrontation_beat(response_id: String, text: String) -> void:
	for ctrl in _option_controls:
		if is_instance_valid(ctrl):
			ctrl.mouse_filter = Control.MOUSE_FILTER_IGNORE

	if _active_tween and _active_tween.is_valid():
		_active_tween.kill()
	_active_tween = create_tween()
	_active_tween.tween_property(panel, "modulate:a", CONFRONTATION_DIM_ALPHA, 0.2)

	confrontation_monologue.emit(UIStrings.get_text(CONFRONTATION_MONOLOGUE_KEY), CONFRONTATION_BEAT_DURATION)
	AudioManager.apply_dip("confrontation")

	_beat_tween = create_tween()
	_beat_tween.tween_interval(CONFRONTATION_BEAT_DURATION)
	_beat_tween.tween_callback(func():
		AudioManager.clear_dip()
		option_selected.emit(response_id, text)
		_end_player_conversation()
	)


func _cancel_beat() -> void:
	if _beat_tween and _beat_tween.is_valid():
		_beat_tween.kill()
		_beat_tween = null
		AudioManager.clear_dip()


# -- Log rendering --

## Rebuild the dialogue log BBCode from all non-expired entries.
func _rebuild_log() -> void:
	if not dialogue_log:
		return
	var now := Time.get_ticks_msec()
	var bbcode := ""
	for entry in _log_entries:
		var alpha: float = 1.0
		if not entry.pinned:
			var age_sec: float = (now - entry.timestamp_msec) / 1000.0
			if age_sec > _entry_lifetime:
				alpha = clampf(1.0 - (age_sec - _entry_lifetime) / _entry_fade, 0.0, 1.0)
		if entry.is_passive:
			alpha *= _passive_opacity
		if alpha <= 0.0:
			continue
		var line := _format_entry(entry, alpha)
		if not bbcode.is_empty():
			bbcode += "\n"
		bbcode += line
	dialogue_log.text = bbcode


## Format a single log entry as BBCode.
## Hoshe #2: escape BBCode brackets in server-sourced strings.
## Araminta: passive lines get ┃ prefix + desaturated colours.
## Non-blocking: 1-on-1 player dialogue simplifies to "Speaker:" (no → You).
func _format_entry(entry: Dictionary, alpha: float) -> String:
	var speaker: String = _escape_bbcode(entry.speaker)
	var target: String = _escape_bbcode(entry.target)
	var text: String = _escape_bbcode(entry.text)
	var is_passive: bool = entry.is_passive

	var speaker_color := _color_for_name(entry.speaker)
	var target_color := _color_for_name(entry.target)

	# Desaturate passive name colours (Araminta review)
	if is_passive:
		speaker_color = _desaturate(speaker_color, PASSIVE_DESATURATION)
		target_color = _desaturate(target_color, PASSIVE_DESATURATION)

	var sc := _color_with_alpha(speaker_color, alpha)
	var ac := _color_with_alpha(_arrow_color, alpha)
	var tc := _color_with_alpha(target_color, alpha)
	var txc := _color_with_alpha(_speech_color, alpha)

	var prefix := PASSIVE_GLYPH if is_passive else ""

	# Non-blocking: simplify 1-on-1 player dialogue — no arrow for Speaker → You or You → Speaker
	var involves_player := entry.speaker == PLAYER_NAME or entry.target == PLAYER_NAME
	if involves_player and not is_passive:
		# Just "Speaker: text" or "You: text"
		return "%s[color=%s][b]%s[/b][/color][color=%s]: %s[/color]" % [
			prefix, sc, speaker, txc, text
		]
	else:
		# Full "Speaker → Target: text" for overheard
		return "%s[color=%s][b]%s[/b][/color][color=%s] \u2192 [/color][color=%s][b]%s[/b][/color][color=%s]: %s[/color]" % [
			prefix, sc, speaker, ac, tc, target, txc, text
		]


## Escape BBCode bracket characters in server-sourced text (Hoshe #2).
static func _escape_bbcode(text: String) -> String:
	return text.replace("[", "[lb]")


## Get a stable color for a character name, with contrast floor enforcement.
func _color_for_name(char_name: String) -> Color:
	if char_name == PLAYER_NAME:
		return _player_color
	if _npc_colors.is_empty():
		return _speech_color
	var idx := absi(char_name.hash()) % _npc_colors.size()
	var color := _npc_colors[idx]
	return _enforce_contrast(color)


## Enforce minimum luminance so name colours remain readable against dark BG (Araminta #3).
static func _enforce_contrast(color: Color) -> Color:
	var lum := color.r * 0.299 + color.g * 0.587 + color.b * 0.114
	if lum < MIN_CONTRAST_LUMINANCE:
		var boost := MIN_CONTRAST_LUMINANCE / maxf(lum, 0.001)
		return Color(
			minf(color.r * boost, 1.0),
			minf(color.g * boost, 1.0),
			minf(color.b * boost, 1.0),
			color.a
		)
	return color


## Desaturate a colour by a factor (0.0 = no change, 1.0 = full greyscale).
static func _desaturate(color: Color, amount: float) -> Color:
	var grey := color.r * 0.299 + color.g * 0.587 + color.b * 0.114
	return Color(
		lerpf(color.r, grey, amount),
		lerpf(color.g, grey, amount),
		lerpf(color.b, grey, amount),
		color.a
	)


## Convert a Color to a hex string with alpha baked in.
static func _color_with_alpha(base: Color, alpha: float) -> String:
	return Color(base.r, base.g, base.b, base.a * alpha).to_html(true)


# -- Entry expiry --

## Remove fully expired entries. Mark dirty if any fading entries exist.
## Pinned entries (active conversation) skip expiry entirely (Araminta #2).
func _expire_entries() -> void:
	if _log_entries.is_empty():
		return
	var now := Time.get_ticks_msec()
	var total_lifetime_msec: int = int((_entry_lifetime + _entry_fade) * 1000.0)
	var removed := false
	var has_fading := false

	# Remove expired non-pinned entries from the front (oldest first)
	while _log_entries.size() > 0:
		var entry: Dictionary = _log_entries[0]
		if entry.pinned:
			break  # Pinned entries never expire
		var age: int = now - entry.timestamp_msec
		if age < total_lifetime_msec:
			# Check if this entry is in the fading phase
			if age > int(_entry_lifetime * 1000.0):
				has_fading = true
			break
		_log_entries.remove_at(0)
		removed = true

	# Check remaining entries for fading state
	if not has_fading:
		for entry in _log_entries:
			if not entry.pinned:
				var age: int = now - entry.timestamp_msec
				if age > int(_entry_lifetime * 1000.0):
					has_fading = true
					break

	if removed or has_fading:
		_log_dirty = true

	if removed and _log_entries.is_empty() and not _in_player_conversation:
		hide_dialogue()


# -- Visibility --

## Ensure panel is visible (fade in if needed).
func _ensure_visible() -> void:
	if _is_showing:
		return
	visible = true
	_is_showing = true
	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)


func _clear_options() -> void:
	for ctrl in _option_controls:
		if is_instance_valid(ctrl):
			ctrl.queue_free()
	_option_controls.clear()
	_option_response_ids.clear()
	_option_texts.clear()
	_option_is_confrontation.clear()


# Hover callbacks
static func _make_hover_on(label: RichTextLabel) -> Callable:
	return func():
		label.add_theme_color_override("default_color", Constants.INSERT_COLOR_HOVER)


static func _make_hover_off(label: RichTextLabel) -> Callable:
	return func():
		label.add_theme_color_override("default_color", Constants.INSERT_COLOR_TEXT)