class_name WeatherIcon
extends Control
## Значок погоды для HUD.
##
## Рисуется процедурно: иконок в наборе фона нет, а тащить шрифт с символами
## ради семи состояний неоправданно. Заодно значок красится темой, а не
## растром, и одинаково чёткий на любом масштабе.

const SUN := Color("#f2b134")
const MOON := Color("#cfd8e6")
const CLOUD := Color("#c6d4e0")
const CLOUD_DARK := Color("#8fa5ba")
const RAIN := Color("#4aa8f2")
const SNOW := Color("#e6f1f7")
const BOLT := Color("#f2b134")

## Тип погоды из WeatherSystem.Kind.
var kind := 0
## Ночью в ясную погоду вместо солнца показываем луну.
var night := false


func _ready() -> void:
	custom_minimum_size = Vector2(24.0, 24.0)


func set_state(weather_kind: int, is_night: bool) -> void:
	if weather_kind == kind and is_night == night:
		return
	kind = weather_kind
	night = is_night
	queue_redraw()


func _draw() -> void:
	var box := Rect2(Vector2.ZERO, size)
	var center := box.get_center()

	match kind:
		WeatherSystem.Kind.CLEAR:
			_draw_body(center, size.x * 0.30)
		WeatherSystem.Kind.CLOUDY:
			_draw_body(center - Vector2(size.x * 0.14, size.y * 0.14), size.x * 0.22)
			_draw_cloud(center + Vector2(size.x * 0.06, size.y * 0.10), CLOUD)
		WeatherSystem.Kind.OVERCAST:
			_draw_cloud(center - Vector2(size.x * 0.10, size.y * 0.06), CLOUD_DARK)
			_draw_cloud(center + Vector2(size.x * 0.08, size.y * 0.08), CLOUD)
		WeatherSystem.Kind.RAIN:
			_draw_cloud(center - Vector2(0.0, size.y * 0.14), CLOUD)
			_draw_streaks(center, RAIN)
		WeatherSystem.Kind.STORM:
			_draw_cloud(center - Vector2(0.0, size.y * 0.14), CLOUD_DARK)
			_draw_streaks(center, RAIN)
			_draw_bolt(center)
		WeatherSystem.Kind.FOG:
			_draw_fog(box)
		WeatherSystem.Kind.SNOW:
			_draw_cloud(center - Vector2(0.0, size.y * 0.14), CLOUD)
			_draw_flakes(center)


## Солнце или луна — смотря какое время суток.
func _draw_body(center: Vector2, radius: float) -> void:
	if night:
		# Полумесяц: круг с вырезом, вырез закрашен фоном значка.
		draw_circle(center, radius, MOON)
		draw_circle(center + Vector2(radius * 0.55, -radius * 0.30), radius * 0.92, Color(0, 0, 0, 0))
		draw_arc(center, radius, PI * 0.35, PI * 1.65, 20, MOON, 2.0)
		return

	draw_circle(center, radius, SUN)
	for index in 8:
		var angle := TAU * float(index) / 8.0
		var direction := Vector2(cos(angle), sin(angle))
		draw_line(center + direction * (radius * 1.35), center + direction * (radius * 1.85), SUN, 1.6)


func _draw_cloud(center: Vector2, tint: Color) -> void:
	var unit := size.x * 0.12
	draw_circle(center + Vector2(-unit * 1.1, 0.0), unit * 1.05, tint)
	draw_circle(center + Vector2(unit * 1.1, unit * 0.15), unit * 0.9, tint)
	draw_circle(center + Vector2(0.0, -unit * 0.55), unit * 1.25, tint)
	draw_rect(Rect2(center + Vector2(-unit * 1.9, -unit * 0.1), Vector2(unit * 3.8, unit * 1.1)), tint)


func _draw_streaks(center: Vector2, tint: Color) -> void:
	var unit := size.x * 0.12
	for index in 3:
		var start := center + Vector2((float(index) - 1.0) * unit * 1.4, unit * 1.3)
		draw_line(start, start + Vector2(-unit * 0.35, unit * 1.3), tint, 1.8)


func _draw_flakes(center: Vector2) -> void:
	var unit := size.x * 0.12
	for index in 3:
		draw_circle(center + Vector2((float(index) - 1.0) * unit * 1.4, unit * 1.9), unit * 0.32, SNOW)


func _draw_bolt(center: Vector2) -> void:
	var unit := size.x * 0.12
	draw_polygon(
		PackedVector2Array([
			center + Vector2(unit * 0.2, unit * 1.1),
			center + Vector2(unit * 1.2, unit * 1.1),
			center + Vector2(unit * 0.4, unit * 2.6),
			center + Vector2(unit * 0.7, unit * 1.7),
			center + Vector2(-unit * 0.2, unit * 1.7),
		]),
		PackedColorArray([BOLT, BOLT, BOLT, BOLT, BOLT])
	)


func _draw_fog(box: Rect2) -> void:
	for index in 3:
		var y := box.position.y + box.size.y * (0.32 + float(index) * 0.18)
		var inset := box.size.x * (0.08 + float(index % 2) * 0.12)
		draw_line(
			Vector2(box.position.x + inset, y), Vector2(box.end.x - inset, y),
			CLOUD_DARK, 2.0
		)