class_name ResearchPanel
extends PanelContainer

const RESEARCH_ROW_SCENE: PackedScene = preload("res://core/research/research_row.tscn")

@onready var _title_label: Label = $ScrollContainer/VBoxContainer/TitleLabel
@onready var _research_rows_container: VBoxContainer = $ScrollContainer/VBoxContainer/ResearchRows

var _game_state: LevelGameState
var _research_rows: Dictionary = {}

func _ready() -> void:
	_game_state = find_parent("LevelGameState")
	if _game_state == null:
		push_error("ResearchPanel: Could not find LevelGameState parent")
		return
	
	_game_state.research_xp_changed.connect(_on_research_xp_changed)
	_game_state.research_level_up.connect(_on_research_level_up)
	
	_build_research_rows()
	_refresh_all()

func _build_research_rows() -> void:
	for child in _research_rows_container.get_children():
		child.queue_free()
	_research_rows.clear()
	
	if _game_state.research_catalogue:
		for research in _game_state.research_catalogue.get_all_research():
			var row: ResearchRow = RESEARCH_ROW_SCENE.instantiate()
			_research_rows_container.add_child(row)
			row.setup(research)
			_research_rows[research.id] = row

func _refresh_all() -> void:
	for row in _research_rows.values():
		_refresh_row(row)

func _refresh_row(row: ResearchRow) -> void:
	var research_id: StringName = row.get_research_id()
	var xp: BigNumber = _game_state.get_research_xp(research_id)
	var level: int = _game_state.get_research_level(research_id)
	var research: ResearchData = _game_state.research_catalogue.get_research_by_id(research_id)
	
	if research != null:
		var progress: float = research.get_xp_progress(xp)
		var multiplier: float = research.get_multiplier_for_level(level)
		var xp_current: BigNumber = xp.subtract(research.get_total_xp_for_level(level))
		var xp_needed: BigNumber = research.get_xp_required_for_level_big(level + 1)
		
		row.update_display(level, progress, multiplier, xp_current, xp_needed)

func _on_research_xp_changed(research_id: StringName, _new_xp: BigNumber) -> void:
	if _research_rows.has(research_id):
		_refresh_row(_research_rows[research_id])

func _on_research_level_up(research_id: StringName, _old_level: int, _new_level: int) -> void:
	if _research_rows.has(research_id):
		_refresh_row(_research_rows[research_id])