extends Node3D
## The boss grotto "Mondschlund" (G2): the Blender sanctuary on the G1 terrace, its five
## states and the resting boss. It reads only public match state (round, boss claim and lock
## round, the grotto boss of the running combat) and never writes into the simulation.
##   AVAILABLE  the boss rests on its dais, runes, source and cave light are awake
##   FIGHT      expeditions are inside: stronger light, faster pulse; the boss is a real unit
##   DEPLOYED   ("nicht verfügbar") the boss fights on a lane for the claiming team: dimmed,
##              the runes keep a faint glow in that team's colour
##   COOLDOWN   exhausted energy after the boss fell: dark, cracked source, no boss
##   SOON       the last locked round: first energy returns, runes flicker awake
## The cooldown rules themselves stay in LuneMatch; this only mirrors them.

const Materials = preload("res://scripts/luneraria/view/lune_materials.gd")
const Fx = preload("res://scripts/luneraria/view/lune_fx.gd")
enum State { AVAILABLE, FIGHT, DEPLOYED, COOLDOWN, SOON }
const STATE_NAMES: Array[String] = ["verfuegbar", "kampf", "nicht_verfuegbar", "cooldown", "bald_verfuegbar"]
const SCENE_PATH := "res://assets/luneraria/g2/bossgrotte.glb"
const BOSS_MODEL := "schlundkrone"
const FALLBACK_BOSS := "e10"
## Local boss point and the source crystal cluster on the altar (see build_bossgrotte.py).
const BOSS_LOCAL := Vector3(-1.5, 0, -1.5)
const SOURCE_LOCAL := Vector3(-3.13, 1.5, -3.13)
const CAVE_LOCAL := Vector3(-7.46, .5, -7.46)
## Floor and dais heights above the terrace (figures stand on them).
const FLOOR_LIFT: float = .088
const DAIS: Array = [[1.64, .124], [2.24, .065]]
## Visual targets per state: runes, crystals, moon water, cave light, source light, motes.
const LOOK: Dictionary = {
	State.AVAILABLE: {"runes": 1.0, "rune_flicker": 0.0, "crystal": 1.0, "crystal_flicker": 0.0, "fracture": 0.0, "water": 1.0,
		"cave": 2.0, "source": 1.2, "motes": .8},
	State.FIGHT: {"runes": 1.45, "rune_flicker": .12, "crystal": 1.45, "crystal_flicker": .2, "fracture": 0.0, "water": 1.3,
		"cave": 2.4, "source": 1.6, "motes": 1.0},
	State.DEPLOYED: {"runes": .28, "rune_flicker": 0.0, "crystal": .22, "crystal_flicker": .25, "fracture": .5, "water": .22,
		"cave": .55, "source": .35, "motes": 0.0},
	State.COOLDOWN: {"runes": .05, "rune_flicker": .5, "crystal": .07, "crystal_flicker": .7, "fracture": .9, "water": .05,
		"cave": .22, "source": 0.0, "motes": 0.0},
	State.SOON: {"runes": .5, "rune_flicker": .45, "crystal": .45, "crystal_flicker": .35, "fracture": .3, "water": .4,
		"cave": 1.2, "source": .8, "motes": .3},
}

var state: int = State.AVAILABLE
## Team whose colour the runes carry while the boss is deployed (-1 = neutral).
var claim_team: int = -1
var fade_target: float = 0.0
var _fade: float = 0.0
var boss_figure: Node3D
var boss_visible: bool = false
var cave_light: OmniLight3D
var source_light: OmniLight3D
var _parts: Dictionary = {}
var _instances: Array = []
var _runes: Array = []
var _crystals: Array = []
var _water: Array = []
var _stone: Array = []
var _look: Dictionary = {}
## The back of the sanctuary (gate, cave, rocks) is what can hide Top-lane figures; only it fades.
var _back: Array = []
var _sent: Dictionary = {}
var _motes: GPUParticles3D
var _sparks: GPUParticles3D
var _burst: GPUParticles3D
var _dust: GPUParticles3D
var _flash: MeshInstance3D
var _flash_time: float = -1.0
var _time: float = 0.0
var _pulse: float = 0.0
var _boss_awake: bool = false
var _ready_once: bool = false
var _victory_played: bool = false

func setup() -> void:
	name = "BossGrotto"
	var model: Node3D = (load(SCENE_PATH) as PackedScene).instantiate()
	model.name = "Model"
	add_child(model)
	for child: Node in model.get_children():
		_parts[str(child.name)] = child
	_instances = Materials.dress(model)
	Materials.apply_team(_instances, 2, 4.2)
	for key: String in _parts:
		var list: Array = _collect(_parts[key])
		if key in ["Gate", "Rocks", "Cave", "CaveGlow"]:
			_back.append_array(list)
		match key:
			"Runes":
				_runes.append_array(list)
			"Source", "PillarCrystals", "CaveGlow":
				_crystals.append_array(list)
			"Channel":
				_water.append_array(list)
			"Cave":
				pass
			_:
				_stone.append_array(list)
	Materials.apply_rune_tint(_runes, 2)
	# The terrace sits 1.7 m up; the dither fade starts above head height of figures on it.
	Materials.set_param(_instances, "fade_floor", position.y + 2.2)
	for group: Array in [_stone, _crystals, _water]:
		for instance: GeometryInstance3D in group:
			instance.set_instance_shader_parameter("tint", Materials.team_color(2, "crystal"))
	cave_light = OmniLight3D.new()
	cave_light.name = "CaveLight"
	cave_light.position = CAVE_LOCAL
	cave_light.light_color = Materials.team_color(2, "light")
	cave_light.omni_range = 7.5
	cave_light.omni_attenuation = 1.6
	add_child(cave_light)
	source_light = OmniLight3D.new()
	source_light.name = "SourceLight"
	source_light.position = SOURCE_LOCAL + Vector3(0, .6, 0)
	source_light.light_color = Materials.team_color(2, "light").lightened(.4)
	source_light.omni_range = 6.5
	source_light.omni_attenuation = 1.5
	add_child(source_light)
	var violet: Color = Materials.team_color(2, "crystal")
	_motes = Fx.motes(violet, 26, 2.2, 3.2)
	_motes.position = BOSS_LOCAL + Vector3(0, .4, 0)
	add_child(_motes)
	_sparks = Fx.sparks(Materials.team_color(2, "light"), 18, 2.6, 1.4)
	_sparks.position = BOSS_LOCAL + Vector3(0, .5, 0)
	add_child(_sparks)
	_burst = Fx.shard_burst(violet, 60, 6.0)
	add_child(_burst)
	_dust = Fx.dust_burst(40, 1.6, 1.8, Color(.5, .47, .52))
	add_child(_dust)
	_flash = Fx.flash_mesh(Color(violet.r * 2.0, violet.g * 2.0, violet.b * 2.0, 1.0), 6.0)
	_flash.position = SOURCE_LOCAL
	_flash.visible = false
	add_child(_flash)
	_make_boss()
	_look = (LOOK[State.AVAILABLE] as Dictionary).duplicate()
	_apply_look(0.0, true)

func _collect(node: Node) -> Array:
	var result: Array = []
	if node is GeometryInstance3D:
		result.append(node)
	for child: Node in node.get_children():
		result.append_array(_collect(child))
	return result

## The boss resting on its dais while the grotto is open: the same figure the fight uses.
func _make_boss() -> void:
	var id: String = BOSS_MODEL if AssetLibrary.has_model(BOSS_MODEL) else FALLBACK_BOSS
	boss_figure = AssetLibrary.instantiate_fighter(id)
	if boss_figure == null:
		return
	boss_figure.name = "RestingBoss"
	boss_figure.scale = Vector3.ONE * 1.7
	boss_figure.position = BOSS_LOCAL + Vector3(0, DAIS[0][1], 0)
	# It faces the arena and the two stairs (towards Mid).
	boss_figure.rotation.y = atan2(LuneMap.AXIS.x, LuneMap.AXIS.y)
	add_child(boss_figure)
	if AssetLibrary.has_model(BOSS_MODEL):
		_tint_boss(boss_figure, 2)

## Crystal glow of the boss figure follows the team it fights for (neutral violet in the grotto).
static func _tint_boss(figure: Node3D, team: int) -> void:
	for instance: GeometryInstance3D in Materials.dress(figure):
		instance.set_instance_shader_parameter("tint", Materials.team_color(team, "crystal"))
		instance.set_instance_shader_parameter("seed", 1.7)
		# Resting: the veins glow at half strength until someone enters the grotto.
		instance.set_instance_shader_parameter("energy", .55)

## Height of the grotto floor or boss dais above the terrace at a local ground distance.
static func surface_lift(local: Vector2) -> float:
	var d: float = local.distance_to(Vector2(BOSS_LOCAL.x, BOSS_LOCAL.z))
	for step: Array in DAIS:
		if d < float(step[0]):
			return float(step[1])
	return FLOOR_LIFT if local.length() < LuneTerrain.ARENA_RADIUS - .2 else 0.0

## The state from the public match state (static so tests can ask without a scene).
static func state_for(match_state: LuneMatch) -> int:
	var combat: LuneCombat = match_state.combat if match_state.phase == LuneMatch.Phase.COMBAT else null
	if combat != null and combat.grotto_boss != null:
		if combat.grotto_boss.alive:
			return State.FIGHT
		return State.COOLDOWN
	var claim: Dictionary = match_state.boss.claim
	if not claim.is_empty():
		return State.DEPLOYED
	var next: int = int(match_state.boss.next_available_round)
	if match_state.round_number >= next:
		return State.AVAILABLE
	if match_state.round_number == next - 1:
		return State.SOON
	return State.COOLDOWN

func state_name() -> String:
	return STATE_NAMES[state]

## World box of the gate and its rocks (the part that can hide Top-lane figures behind it).
func occluder_box() -> AABB:
	var box := AABB()
	var first: bool = true
	for local: Vector3 in [Vector3(-9.6, 2.2, -2.2), Vector3(-2.2, 2.2, -9.6), Vector3(-5.1, 7.4, -9.8), Vector3(-9.8, 7.4, -5.1),
			Vector3(-4.2, 2.2, -4.2), Vector3(-8.6, 7.4, -8.6)]:
		var point: Vector3 = to_global(local)
		box = AABB(point, Vector3.ZERO) if first else box.expand(point)
		first = false
	return box

func current_fade() -> float:
	return _fade

## Called every frame with the match and the unit views (to find the fighting boss).
func sync(match_state: LuneMatch, views: Dictionary, delta: float) -> void:
	_time += delta
	var next: int = state_for(match_state)
	var claim: Dictionary = match_state.boss.claim
	var team: int = int(claim.team) if not claim.is_empty() else -1
	if next != state or team != claim_team:
		_enter(next, team)
	var combat: LuneCombat = match_state.combat if match_state.phase == LuneMatch.Phase.COMBAT else null
	var fighter: LuneUnit = combat.grotto_boss if combat != null else null
	# The resting figure stands in whenever no boss unit is on the dais.
	boss_visible = state == State.AVAILABLE and fighter == null
	if boss_figure != null:
		boss_figure.visible = boss_visible
		if boss_visible:
			_animate_resting(delta)
	if fighter != null and fighter.alive and not fighter.dormant and not _boss_awake:
		_boss_awake = true
		_wake(views.get(fighter.id))
	elif fighter == null or fighter.dormant:
		_boss_awake = false
	# The expeditions failed and the boss still stands: it claims its grotto (victory clip).
	if fighter != null and fighter.alive and combat.grotto_resolved and combat.grotto_outcome == "failed" and not _victory_played:
		_victory_played = true
		var view: Node3D = views.get(fighter.id)
		if view != null and view.model != null and view.model.has_method("play_event"):
			view.model.play_event("victory")
	elif fighter == null:
		_victory_played = false
	_pulse = maxf(0.0, _pulse - delta * 1.6)
	_apply_look(delta)
	_ready_once = true

func _enter(next: int, team: int) -> void:
	var previous: int = state
	state = next
	claim_team = team
	var tint: Color = Materials.team_color(team, "rune") if next == State.DEPLOYED and team >= 0 else Materials.team_color(2, "rune")
	Materials.set_param(_runes, "tint", tint)
	_motes.emitting = float(LOOK[next].motes) > 0.0
	_motes.amount_ratio = maxf(.05, float(LOOK[next].motes))
	_sparks.emitting = next == State.FIGHT
	if _ready_once and previous == State.FIGHT and next == State.COOLDOWN:
		# The boss has fallen: the source overloads once and the energy collapses.
		Fx.fire(_burst, to_global(SOURCE_LOCAL))
		Fx.fire(_dust, to_global(BOSS_LOCAL))
		_flash.visible = true
		_flash_time = 0.0

## The boss wakes when one expedition remains: roar clip on its figure and a pulse of light.
func _wake(view: Node3D) -> void:
	_pulse = 1.0
	if view != null and view.model != null and view.model.has_method("play_event"):
		view.model.play_event("roar")

func _animate_resting(_delta: float) -> void:
	if boss_figure.has_method("preview"):
		var length: float = boss_figure.clip_length("idle") if boss_figure.has_method("clip_length") else 3.0
		boss_figure.preview("idle", fmod(_time, maxf(.1, length)))
	elif boss_figure.has_method("pose"):
		boss_figure.pose(_time, false, 0.0, 0.0, 0.0)

func _param(group: Array, key: String, parameter: String, value: float, epsilon: float = .01) -> void:
	var id: String = key + ":" + parameter
	if _sent.has(id) and absf(float(_sent[id]) - value) < epsilon:
		return
	_sent[id] = value
	Materials.set_param(group, parameter, value)

## Eases every visual channel towards the state's targets (1.2 s), plus the fight pulse.
func _apply_look(delta: float, instant: bool = false) -> void:
	var target: Dictionary = LOOK[state]
	for key: String in target:
		_look[key] = float(target[key]) if instant else move_toward(float(_look[key]), float(target[key]), delta * maxf(.8, absf(float(target[key]) - float(_look[key])) / 1.2))
	var beat: float = 0.0
	if state == State.FIGHT:
		beat = .25 * (.5 + .5 * sin(_time * 5.5))
	var boost: float = 1.0 + _pulse * 1.3 + beat
	_param(_runes, "runes", "energy", float(_look.runes) * boost, .02)
	_param(_runes, "runes", "flicker", float(_look.rune_flicker))
	_param(_crystals, "crystals", "energy", float(_look.crystal) * boost, .02)
	_param(_crystals, "crystals", "flicker", float(_look.crystal_flicker))
	_param(_crystals, "crystals", "fracture", float(_look.fracture))
	_param(_water, "water", "energy", float(_look.water) * (1.0 + _pulse * .6), .02)
	cave_light.light_energy = float(_look.cave) * (1.0 + _pulse * .8 + beat * .6)
	source_light.light_energy = float(_look.source) * boost
	cave_light.visible = cave_light.light_energy > .02
	source_light.visible = source_light.light_energy > .02
	if _flash_time >= 0.0:
		_flash_time += delta
		var k: float = clampf(_flash_time / .6, 0.0, 1.0)
		_flash.scale = Vector3.ONE * lerpf(.3, 1.5, k)
		_flash.transparency = k
		if k >= 1.0:
			_flash.visible = false
			_flash_time = -1.0
	_fade = move_toward(_fade, fade_target, delta * 3.0)
	_param(_back, "back", "fade", _fade, .02)