class_name LuneUnit
extends RefCounted
## One combat instance. Persistent ownership stays in LuneMatch; this object lives for
## one combat phase. Damage, heals and effects are queued and applied by LuneCombat.

const DAMAGE_MATRIX = [[1.30, 0.75, 1.00], [1.00, 1.30, 0.75], [0.75, 1.00, 1.30]]
const MOBILE_KINDS: Array[String] = ["troop", "hero", "monster", "champion", "boss"]

var id: int = 0
var kind: String = "troop"
var team: int = 0
var owner_slot: int = -1
var persistent_uid: String = ""
var lane: String = "mid"
var zone: String = "lane"
var def: Dictionary = {}
var building_id: String = ""
var position: Vector2 = Vector2.ZERO
var previous_position: Vector2 = Vector2.ZERO
var facing: float = 0.0
var hp: float = 1.0
var max_hp: float = 1.0
var alive: bool = true
var target: LuneUnit = null
var progress: float = 0.0
var lateral: float = 0.0
var attack_progress: float = 0.0
var hit_count: int = 0
var combat_time: float = 0.0
var shield: float = 0.0
var shield_remaining: float = INF
var effects: Dictionary = {}
var dots: Dictionary = {}
var ability_ready: float = 6.0
var reached_base: bool = false
# Presentation-only signals; never read by the rules.
var attack_serial: int = 0
var ability_serial: int = 0
var hit_flash: float = 0.0
var in_range: bool = false
var death_time: float = -1.0

func is_building() -> bool:
	return kind == "tower" or kind == "core"

func is_mobile() -> bool:
	return kind in MOBILE_KINDS

func attack_range() -> float:
	return float(def.get("attack_range", 1.0))

func speed() -> float:
	return float(def.get("speed", 2.0))

func armor_type() -> int:
	return clampi(int(def.get("armor_type", 1 if is_building() else 0)), 0, 2)

func ability() -> String:
	return str(def.get("ability", ""))

func is_boss() -> bool:
	return kind == "boss" or bool(def.get("is_boss", false))

func mitigated(raw: float, attack_type: int) -> float:
	var value: float = maxf(0.0, raw) * float(DAMAGE_MATRIX[clampi(attack_type, 0, 2)][armor_type()])
	return value * (1.0 - damage_reduction())

## Applies an already mitigated amount through the shield.
func take(amount: float) -> void:
	if not alive or amount <= 0.0:
		return
	var absorbed: float = minf(shield, amount)
	shield -= absorbed
	hp = maxf(0.0, hp - (amount - absorbed))
	hit_flash = .18

func heal(amount: float) -> void:
	if alive and not is_building():
		hp = minf(max_hp, hp + maxf(0.0, amount) * (1.0 - strongest_effect("healing_reduction")))

func grant_shield(amount: float, duration: float = INF) -> void:
	if alive and amount > shield:
		shield = amount
		shield_remaining = duration

func apply_effect(family: String, effect_kind: String, amount: float, duration: float) -> void:
	# Buildings ignore crowd control and buffs; their gates are handled elsewhere.
	if not alive or is_building():
		return
	if effects.has(family):
		effects[family].amount = maxf(float(effects[family].amount), amount)
		effects[family].remaining = maxf(float(effects[family].remaining), duration)
	else:
		effects[family] = {"kind": effect_kind, "amount": amount, "remaining": duration}

func apply_dot(family: String, damage: float, duration: float, attack_type: int) -> void:
	if not alive or is_building():
		return
	if dots.has(family):
		var effect: Dictionary = dots[family]
		if damage > float(effect.damage):
			effect.damage = damage
			effect.attack_type = attack_type
		effect.remaining = maxf(float(effect.remaining), duration)
	else:
		dots[family] = {"damage": damage, "remaining": duration, "next_tick": 1.0, "attack_type": attack_type}

func strongest_effect(effect_kind: String) -> float:
	var amount: float = 0.0
	for effect: Dictionary in effects.values():
		if str(effect.kind) == effect_kind:
			amount = maxf(amount, float(effect.amount))
	return amount

func damage_bonus() -> float:
	var result: float = 0.0
	for effect: Dictionary in effects.values():
		if str(effect.kind) == "damage":
			result += float(effect.amount)
	return minf(0.30, result) + float(def.get("damage_bonus", 0.0))

func damage_reduction() -> float:
	var result: float = strongest_effect("reduction")
	match ability():
		"g03":
			if combat_time < 8.0 - 0.000001:
				result = maxf(result, 0.15)
		"g04":
			result = maxf(result, 0.25 if combat_time < 10.0 - 0.000001 else 0.10)
	return minf(0.35, result + float(def.get("reduction_bonus", 0.0)))

func attack_speed_factor() -> float:
	var slowing: float = strongest_effect("attack_slow") * (0.5 if is_boss() else 1.0)
	return 1.0 + clampf(strongest_effect("attack_speed") - slowing, -0.25, 0.25)

func movement_factor() -> float:
	return 1.0 - minf(0.35, strongest_effect("movement_slow") * (0.5 if is_boss() else 1.0))

## Status timers; DoT damage is returned so the caller can queue it with all other damage.
func advance_status(delta: float) -> float:
	combat_time += delta
	hit_flash = maxf(0.0, hit_flash - delta)
	for family: String in effects.keys():
		effects[family].remaining -= delta
		if float(effects[family].remaining) <= 0.000001:
			effects.erase(family)
	if shield_remaining != INF:
		shield_remaining -= delta
		if shield_remaining <= 0.000001:
			shield = 0.0
	var dot_damage: float = 0.0
	for family: String in dots.keys():
		var effect: Dictionary = dots[family]
		effect.next_tick -= minf(delta, maxf(0.0, float(effect.remaining)))
		while float(effect.next_tick) <= 0.000001:
			dot_damage += mitigated(float(effect.damage), int(effect.attack_type))
			effect.next_tick += 1.0
		effect.remaining -= delta
		if float(effect.remaining) <= 0.000001:
			dots.erase(family)
	return dot_damage