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scripts/autoloads/player_stats.gd

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+## PlayerStats — 玩家属性统计（Autoload: PlayerStats）
+## 权威来源：development_plan.md S2、numerical_design.md §1.2
+extends Node
+
+signal stats_changed
+signal leveled_up(new_level: int)
+
+# ── HP ───────────────────────────────────────────────
+var hp:     float = 100.0
+var hp_max: float = 100.0
+
+# ── 资源 ──────────────────────────────────────────────
+var gold:   int   = 0
+var xp:     int   = 0
+
+# ── 等级 ──────────────────────────────────────────────
+var level:     int = 1
+var xp_to_next: int = 10  # 升级所需 XP
+
+# ── 战斗属性 ───────────────────────────────────────────
+var cpu_limit:     int = 5    # 控制 MAX_OPS = cpu_limit * 40
+var armor:         float = 0.0
+var resistance:    float = 0.0  # 0.0~1.0
+
+func _ready() -> void:
+	EventBus.subscribe(EventID.PLAYER_DAMAGED, _on_player_damaged)
+
+## 升级曲线：roundf(10 × 1.4^(level-1))，P6-N16
+## Level 1→2: 10 XP; Level 5→6: ≈ 54 XP
+static func xp_for_level(lv: int) -> int:
+	return roundi(10.0 * pow(1.4, float(lv - 1)))
+
+func gain_xp(amount: int) -> void:
+	xp += amount
+	while xp >= xp_to_next:
+		xp -= xp_to_next
+		level += 1
+		xp_to_next = xp_for_level(level)
+		leveled_up.emit(level)
+		EventBus.emit(EventID.LEVEL_UP, {"level": level})
+	stats_changed.emit()
+
+func gain_gold(amount: int) -> void:
+	gold += amount
+	stats_changed.emit()
+
+func spend_gold(amount: int) -> bool:
+	if gold < amount:
+		return false
+	gold -= amount
+	stats_changed.emit()
+	return true
+
+func take_damage(amount: float) -> void:
+	hp = max(0.0, hp - amount * SettingsManager.player_dmg_taken_mult())  # 难度减伤（初学者×0.7）
+	stats_changed.emit()
+	if hp <= 0.0:
+		EventBus.emit(EventID.PLAYER_DIED, {})
+
+func heal(amount: float) -> void:
+	hp = min(hp_max, hp + amount)
+	stats_changed.emit()
+
+func get_hp_percent() -> float:
+	return hp / max(hp_max, 0.001)
+
+func _on_player_damaged(payload: Dictionary) -> void:
+	take_damage(float(payload.get("damage", 0.0)))
+
+func reset_for_run() -> void:
+	hp        = hp_max
+	gold      = 0
+	xp        = 0
+	level     = 1
+	xp_to_next = xp_for_level(1)
+	stats_changed.emit()
+
+func get_save_data() -> Dictionary:
+	return {"hp": hp, "hp_max": hp_max, "gold": gold, "xp": xp, "level": level, "cpu_limit": cpu_limit}
+
+func load_save_data(data: Dictionary) -> void:
+	hp        = float(data.get("hp",     100.0))
+	hp_max    = float(data.get("hp_max", 100.0))
+	gold      = int(data.get("gold",    0))
+	xp        = int(data.get("xp",      0))
+	level     = int(data.get("level",   1))
+	cpu_limit = int(data.get("cpu_limit", 5))
+	xp_to_next = xp_for_level(level)
+	stats_changed.emit()