class_name MainUI
extends CanvasLayer

@onready var health_bar: ProgressBar = $StatusBars/HealthBar
@onready var charge_bar: ProgressBar = $StatusBars/ChargeBar
@onready var combo_skill_label: Label = $ComboSkillLabel

var charge_bar_ready := false
var charge_flash := 0.0


func _ready() -> void:
	_apply_bar_styles()
	var bus := _event_bus()
	bus.connect("player_health_changed", _on_health_changed)
	bus.connect("player_charge_changed", _on_charge_changed)
	bus.connect("skill_executed", _on_skill_executed)


func _process(delta: float) -> void:
	_update_charge_bar_flash(delta)


func _on_health_changed(current: int, maximum: int) -> void:
	health_bar.max_value = max(1, maximum)
	health_bar.value = clampi(current, 0, maximum)


func _on_charge_changed(current: float, maximum: float, ready: bool, active: bool) -> void:
	charge_bar.max_value = maxf(0.01, maximum)
	charge_bar.value = clampf(current, 0.0, maximum)
	charge_bar_ready = ready and active
	if charge_bar_ready:
		return
	charge_bar.modulate = Color(1.0, 1.0, 1.0, 1.0 if active or ready else 0.45)


func _on_skill_executed(skill: Resource, _judgement: StringName) -> void:
	var display_name := str(skill.get("display_name"))
	if display_name.is_empty():
		display_name = str(skill.get("id")).to_upper()
	combo_skill_label.text = display_name
	var tween := create_tween()
	combo_skill_label.scale = Vector2(1.12, 1.12)
	tween.tween_property(combo_skill_label, "scale", Vector2.ONE, 0.12)


func _update_charge_bar_flash(delta: float) -> void:
	if not charge_bar_ready:
		charge_flash = 0.0
		return
	charge_flash = fmod(charge_flash + delta * 7.0, TAU)
	var alpha := 0.62 + 0.38 * absf(sin(charge_flash))
	charge_bar.modulate = Color(1.0, 1.0, 1.0, alpha)


func _apply_bar_styles() -> void:
	health_bar.add_theme_stylebox_override(
		"background",
		_make_style(Color(0.12, 0.08, 0.08, 0.86), Color(0.6, 0.12, 0.16, 0.95))
	)
	health_bar.add_theme_stylebox_override(
		"fill",
		_make_style(Color(0.86, 0.11, 0.18, 1.0), Color.TRANSPARENT, false)
	)
	charge_bar.add_theme_stylebox_override(
		"background",
		_make_style(Color(0.08, 0.07, 0.12, 0.86), Color(0.42, 0.36, 0.75, 0.9))
	)
	charge_bar.add_theme_stylebox_override(
		"fill",
		_make_style(Color(0.92, 0.72, 0.25, 1.0), Color.TRANSPARENT, false)
	)


func _make_style(bg_color: Color, border_color: Color, has_border := true) -> StyleBoxFlat:
	var style := StyleBoxFlat.new()
	style.bg_color = bg_color
	if has_border:
		style.border_width_left = 1
		style.border_width_top = 1
		style.border_width_right = 1
		style.border_width_bottom = 1
		style.border_color = border_color
	return style


func _event_bus() -> Node:
	var root := get_tree().root
	var bus := root.get_node_or_null("EventBus")
	if bus == null:
		bus = load("res://autoload/event_bus.gd").new()
		bus.name = "EventBus"
		root.add_child(bus)
	return bus