extends Control

## Journal panel — knowledge graph review. #264, D-041.
##
## Toggle with J key. Displays accumulated facts from GameState.player_knowledge
## grouped by entity. Read-only — no player interaction beyond scrolling.
##
## KnowledgeState rendering:
##   Active       → normal color (INSERT_COLOR_TEXT)
##   Stale        → dimmed (IMPLANT_TEXT_DIM)
##   Contradicted → amber tint + strikethrough (ENTITY_COLOR_POI) — THE FRIEND arc surface
##
## KnowledgeConfidence labels (D-041):
##   Direct → KnowsDetails → KnowsOf → Suspects
##
## Cannot be open simultaneously with dialogue (sprint briefing constraint).
## Closes when dialogue opens.

const FADE_IN: float = 0.18
const FADE_OUT: float = 0.25

# D-041/D-042: confidence and source labels loaded from UIStrings (data/ui-strings.yaml).
# Keys: knowledge_panel.confidence_{lower} and knowledge_panel.source_{lower}
# Fallback: raw value if key not found (UIStrings returns the key itself).

@onready var panel: PanelContainer = $PanelContainer
@onready var title_label: Label = $PanelContainer/MarginContainer/VBoxContainer/TitleLabel
@onready var scroll: ScrollContainer = $PanelContainer/MarginContainer/VBoxContainer/ScrollContainer
@onready var entries_container: VBoxContainer = $PanelContainer/MarginContainer/VBoxContainer/ScrollContainer/EntriesContainer

var _visible_state: bool = false
var _last_rendered_tick: int = -1

func _ready() -> void:
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	visible = false
	modulate.a = 0.0
	title_label.text = UIStrings.get_text("knowledge_panel.tab_contacts")


## Toggle open/close. Called from main.gd on J key press.
func toggle() -> void:
	if _visible_state:
		_hide_panel()
	else:
		_show_panel()


## Force-close. Called when dialogue opens.
func close() -> void:
	if _visible_state:
		_hide_panel()


func is_open() -> bool:
	return _visible_state


func _show_panel() -> void:
	_rebuild_entries()
	_visible_state = true
	visible = true
	var t := create_tween()
	t.tween_property(self, "modulate:a", 1.0, FADE_IN)


func _hide_panel() -> void:
	_visible_state = false
	var t := create_tween()
	t.tween_property(self, "modulate:a", 0.0, FADE_OUT)
	t.tween_callback(func(): visible = false)


## Rebuild the entry list from GameState.player_knowledge.
func _rebuild_entries() -> void:
	# Clear previous entries
	for child in entries_container.get_children():
		child.queue_free()

	var knowledge: Variant = GameState.player_knowledge
	if knowledge == null:
		_add_empty_state()
		return

	var entities: Array = knowledge.get("entities", [])
	if entities.is_empty():
		_add_empty_state()
		return

	for entity in entities:
		if not entity is Dictionary:
			continue
		_add_entity_entry(entity)


func _add_empty_state() -> void:
	var label := Label.new()
	label.text = UIStrings.get_text("knowledge_panel.empty_state")
	label.add_theme_color_override("font_color", Constants.IMPLANT_TEXT_DIM)
	label.add_theme_font_size_override("font_size", 13)
	entries_container.add_child(label)


func _add_entity_entry(entity: Dictionary) -> void:
	var name_str: String = entity.get("name", "Unknown")
	var confidence: String = entity.get("confidence", "Suspects")
	var source: String = entity.get("source", "")
	var state: String = entity.get("state", "Active")
	var relationship: String = entity.get("relationship", "Unknown")

	# Entity header — name + relationship status
	var header_rtl := RichTextLabel.new()
	header_rtl.bbcode_enabled = true
	header_rtl.fit_content = true
	header_rtl.scroll_active = false
	header_rtl.mouse_filter = Control.MOUSE_FILTER_IGNORE
	header_rtl.add_theme_font_size_override("normal_font_size", 14)

	var rel_color: Color = Constants.color_for_relationship(relationship)
	var rel_label: String = UIStrings.get_text("relationship_states.%s.label" % relationship.to_lower())
	if rel_label == "relationship_states.%s.label" % relationship.to_lower():
		rel_label = relationship  # fallback if key missing

	var state_color: Color = _state_color(state)
	var conf_label: String = UIStrings.get_text("knowledge_panel.confidence_%s" % confidence.to_lower())
	var src_label: String = _resolve_source_label(source)

	# Build BBCode:
	# [color=#hex][b]Name[/b][/color]  [color=#rel_hex]Status[/color]
	var name_hex: String = state_color.to_html(false)
	var rel_hex: String = rel_color.to_html(false)

	var header_bbcode: String
	if state == "Contradicted":
		header_bbcode = "[color=#%s][b][s]%s[/s][/b][/color]  [color=#%s]%s[/color]" % [
			name_hex, name_str, rel_hex, rel_label
		]
	else:
		header_bbcode = "[color=#%s][b]%s[/b][/color]  [color=#%s]%s[/color]" % [
			name_hex, name_str, rel_hex, rel_label
		]
	header_rtl.text = header_bbcode
	entries_container.add_child(header_rtl)

	# Detail line — confidence + source
	var detail_rtl := RichTextLabel.new()
	detail_rtl.bbcode_enabled = true
	detail_rtl.fit_content = true
	detail_rtl.scroll_active = false
	detail_rtl.mouse_filter = Control.MOUSE_FILTER_IGNORE
	detail_rtl.add_theme_font_size_override("normal_font_size", 12)

	var detail_hex: String = Constants.IMPLANT_TEXT_DIM.to_html(false)
	var detail_text: String = "%s · %s" % [conf_label, src_label] if src_label else conf_label
	detail_rtl.text = "[color=#%s]%s[/color]" % [detail_hex, detail_text]
	entries_container.add_child(detail_rtl)

	# Spacer between entries
	var spacer := Control.new()
	spacer.custom_minimum_size = Vector2(0, 6)
	entries_container.add_child(spacer)


## Resolve a source string from the server into a human-readable label.
## Handles plain keys ("DirectObservation", "Heard") and ToldBy(N) format.
## ToldBy(N) looks up entity_id N in player_knowledge.entities for the name.
func _resolve_source_label(source: String) -> String:
	if source.is_empty():
		return ""

	# ToldBy(entity_id) format — e.g. "ToldBy(12)"
	if source.begins_with("ToldBy(") and source.ends_with(")"):
		var id_str: String = source.substr(7, source.length() - 8)
		var entity_id: int = id_str.to_int()
		var name := _entity_name_for_id(entity_id)
		var told_prefix: String = UIStrings.get_text("knowledge_panel.source_toldby")
		if told_prefix == "knowledge_panel.source_toldby":
			told_prefix = "Told"
		return "%s: %s" % [told_prefix, name]

	# Plain source key — look up UIStrings
	var key: String = "knowledge_panel.source_%s" % source.to_lower()
	return UIStrings.get_text(key)


## Look up an entity name by stable ID from GameState.player_knowledge.entities.
func _entity_name_for_id(entity_id: int) -> String:
	var knowledge: Variant = GameState.player_knowledge
	if knowledge == null:
		return "#%d" % entity_id
	for entity in knowledge.get("entities", []):
		if entity is Dictionary and int(entity.get("entity_id", -1)) == entity_id:
			return entity.get("name", "#%d" % entity_id)
	return "#%d" % entity_id


func _state_color(state: String) -> Color:
	match state:
		"Contradicted":
			return Constants.ENTITY_COLOR_POI   # amber — THE FRIEND arc
		"Stale":
			return Constants.IMPLANT_TEXT_DIM   # dimmed
		_:
			return Constants.INSERT_COLOR_TEXT  # active — normal


## Called from main.gd on each snapshot to close the panel when dialogue opens.
func update_from_state() -> void:
	if _visible_state and GameState.dialogue_active:
		close()
	# Rebuild if open and knowledge data is newer than last render
	if _visible_state and GameState.current_tick != _last_rendered_tick:
		_last_rendered_tick = GameState.current_tick
		_rebuild_entries()