extends Object
class_name LevelEnvironment

## Shared stylized environment for every level: saturated anime-sky gradient,
## bloom for emissives (tracers, plasma), and a color grade that pushes the
## cel-shaded look (high saturation, slight contrast lift). Builders call
## add_to(level) instead of hand-rolling WorldEnvironment + sun.


## Creates and adds a WorldEnvironment + key sun + cool fill light.
## Returns the WorldEnvironment node.
static func add_to(level: Node, sky_variant: String = "day") -> WorldEnvironment:
	var env := WorldEnvironment.new()
	env.name = "WorldEnvironment"
	env.environment = make_environment(sky_variant)
	level.add_child(env)

	if not level.has_node("Sun"):
		var sun := DirectionalLight3D.new()
		sun.name = "Sun"
		sun.rotation_degrees = Vector3(-52, 38, 0)
		sun.light_color = Color(1.0, 0.97, 0.88)
		sun.light_energy = 1.4
		sun.shadow_enabled = true
		sun.directional_shadow_mode = DirectionalLight3D.SHADOW_PARALLEL_4_SPLITS
		sun.directional_shadow_max_distance = 120.0
		level.add_child(sun)

		var fill := DirectionalLight3D.new()
		fill.name = "FillLight"
		fill.rotation_degrees = Vector3(-30, -142, 0)
		fill.light_color = Color(0.6, 0.7, 1.0)
		fill.light_energy = 0.25
		fill.shadow_enabled = false
		level.add_child(fill)

	# Screen-space ink edge pass: drawn outlines on every model for whatever
	# camera renders (fullscreen POSITION-override quad, never culled).
	if not level.has_node("InkEdgePost"):
		var ink := MeshInstance3D.new()
		ink.name = "InkEdgePost"
		var quad := QuadMesh.new()
		quad.size = Vector2(2, 2)
		var ink_mat := ShaderMaterial.new()
		ink_mat.shader = load("res://assets/shaders/ink_edge.gdshader")
		quad.material = ink_mat
		ink.mesh = quad
		ink.extra_cull_margin = 16384.0
		level.add_child(ink)

	# Quiet ambient bed so the arena never sits in dead air.
	if not level.has_node("AmbientBed") and ResourceLoader.exists("res://assets/sounds/wind.wav"):
		var amb := AudioStreamPlayer.new()
		amb.name = "AmbientBed"
		amb.stream = load("res://assets/sounds/wind.wav")
		if amb.stream is AudioStreamWAV:
			amb.stream.loop_mode = AudioStreamWAV.LOOP_FORWARD
			amb.stream.loop_end = amb.stream.data.size() / 2
		amb.volume_db = -30.0
		amb.pitch_scale = 0.6
		amb.bus = "SFX"
		amb.autoplay = true
		level.add_child(amb)
	return env


static func make_environment(sky_variant: String = "day") -> Environment:
	var environment := Environment.new()
	environment.background_mode = Environment.BG_SKY
	var sky := Sky.new()
	var sky_mat := ProceduralSkyMaterial.new()
	match sky_variant:
		"sunset":
			sky_mat.sky_top_color = Color(0.25, 0.2, 0.5)
			sky_mat.sky_horizon_color = Color(0.95, 0.6, 0.45)
			sky_mat.ground_bottom_color = Color(0.18, 0.12, 0.2)
			sky_mat.ground_horizon_color = Color(0.85, 0.55, 0.45)
			sky_mat.sun_curve = 0.12
		_:
			# Bold anime day sky: deep saturated blue up top, bright cyan horizon.
			sky_mat.sky_top_color = Color(0.18, 0.4, 0.85)
			sky_mat.sky_horizon_color = Color(0.72, 0.88, 0.98)
			sky_mat.ground_bottom_color = Color(0.22, 0.2, 0.24)
			sky_mat.ground_horizon_color = Color(0.62, 0.7, 0.75)
			sky_mat.sun_curve = 0.1
	sky_mat.sun_angle_max = 20.0
	sky.sky_material = sky_mat
	environment.sky = sky

	# Flat-ish ambient keeps toon shadow bands readable (sun does the shaping).
	environment.ambient_light_source = Environment.AMBIENT_SOURCE_SKY
	environment.ambient_light_energy = 0.55

	# Filmic with a high white point: near-linear through the cel bands (they
	# stay crisp) but a soft shoulder above 1.0. LINEAR clipped lit white
	# surfaces and then bloomed the clip — every facade glowed like porcelain.
	environment.tonemap_mode = Environment.TONE_MAPPER_FILMIC
	environment.tonemap_white = 2.4

	# Bloom for genuine emissives only (tracers, plasma, neon) — lit geometry
	# must never cross this threshold or it reads as glowing glass.
	environment.glow_enabled = true
	environment.glow_intensity = 0.4
	environment.glow_bloom = 0.05
	environment.glow_hdr_threshold = 1.45

	# Cel color grade: a LIGHT saturation lift only. Anything stronger shifts
	# hues — authored ginger hair grades into fire-truck red, pastels go neon —
	# and the whole game reads "filtered". Let the textures' own colors carry
	# the vibrancy.
	environment.adjustment_enabled = true
	environment.adjustment_saturation = 1.08
	environment.adjustment_contrast = 1.03

	# A touch of depth haze for scale; far enough to not gray the arena.
	environment.fog_enabled = true
	environment.fog_light_color = Color(0.65, 0.75, 0.9)
	environment.fog_density = 0.0012
	return environment