feat: adding the skin_shader_generator, and gacha base barebone

scripts/managers/gacha_manager.gd

@@ -0,0 +1,137 @@
+extends Node
+## GachaManager — Autoload singleton
+## Handles pull logic, pity counter, and fragment reward dispatch.
+
+const DATA_PATH = "res://assets/data/gacha_data.json"
+
+var data: Dictionary = {}
+
+# pity_counters[banner_id] = int
+var pity_counters: Dictionary = {"star": 0, "gold": 0}
+
+signal pull_completed(results: Array)  # Array of {id, rarity, name}
+
+func _ready() -> void:
+	_load_data()
+
+func _load_data() -> void:
+	var f := FileAccess.open(DATA_PATH, FileAccess.READ)
+	if f:
+		var parsed = JSON.parse_string(f.get_as_text())
+		if parsed is Dictionary:
+			data = parsed
+	else:
+		push_error("[GachaManager] Could not open gacha_data.json")
+
+# ─── Public API ──────────────────────────────────────────────────────────────
+
+func pull(banner_id: String, count: int) -> Array:
+	if data.is_empty(): _load_data()
+	var banner: Dictionary = data.get("banners", {}).get(banner_id, {})
+	if banner.is_empty():
+		push_error("[GachaManager] Unknown banner: " + banner_id)
+		return []
+
+	var currency: String  = banner.get("currency", "star")
+	var cost_key: String  = "pull_%d_cost" % count
+	var cost: int         = banner.get(cost_key, banner.get("pull_1_cost", 999) * count)
+	var pity_at: int      = banner.get("pity_at", 90)
+
+	# Deduct currency
+	var bal: int = UserProfileManager.wallet.get(currency, 0)
+	if bal < cost:
+		push_warning("[GachaManager] Not enough %s (have %d need %d)" % [currency, bal, cost])
+		return []
+	UserProfileManager.wallet[currency] = bal - cost
+	UserProfileManager.save_wallet()
+
+	var results: Array = []
+	for _i in range(count):
+		var pity: int = pity_counters.get(banner_id, 0)
+		var rarity: String
+		if pity + 1 >= pity_at:
+			rarity = "real_prize"
+			pity_counters[banner_id] = 0
+		else:
+			rarity = _roll_rarity(banner.get("rates", {}))
+			pity_counters[banner_id] = (pity + 1) if rarity != "real_prize" else 0
+
+		var item_id: String = _pick_from_pool(rarity, banner_id)
+		var item_data: Dictionary = _resolve_item(item_id, rarity)
+		results.append({
+			"id":     item_id,
+			"rarity": rarity,
+			"name":   item_data.get("name", item_id)
+		})
+		_grant_item(item_id, rarity)
+
+	pull_completed.emit(results)
+	return results
+
+func get_pity(banner_id: String) -> int:
+	return pity_counters.get(banner_id, 0)
+
+func get_balance(banner_id: String) -> int:
+	var banner: Dictionary = data.get("banners", {}).get(banner_id, {})
+	var currency: String = banner.get("currency", "star")
+	return UserProfileManager.wallet.get(currency, 0)
+
+# ─── Internal ─────────────────────────────────────────────────────────────────
+
+func _roll_rarity(rates: Dictionary) -> String:
+	var roll := randf()
+	var cumulative := 0.0
+	for rarity in ["real_prize", "rare", "uncommon", "common"]:
+		cumulative += rates.get(rarity, 0.0)
+		if roll <= cumulative:
+			return rarity
+	return "common"
+
+func _pick_from_pool(rarity: String, _banner_id: String) -> String:
+	var pool: Array = data.get("pools", {}).get(rarity, [])
+	if pool.is_empty(): return ""
+	return pool[randi() % pool.size()]
+
+func _resolve_item(item_id: String, rarity: String) -> Dictionary:
+	if rarity == "real_prize":
+		return data.get("real_prize_catalog", {}).get(item_id, {})
+	return data.get("fragments", {}).get(item_id, {})
+
+func _grant_item(item_id: String, rarity: String) -> void:
+	if rarity == "real_prize":
+		# Add skin directly to inventory
+		if not UserProfileManager.inventory.has(item_id):
+			UserProfileManager.inventory.append(item_id)
+	else:
+		# Add fragment count
+		var frags: Dictionary = UserProfileManager.fragments
+		frags[item_id] = frags.get(item_id, 0) + 1
+		UserProfileManager.fragments = frags
+
+# ─── Crafting ─────────────────────────────────────────────────────────────────
+
+func get_all_recipes() -> Dictionary:
+	return data.get("craft_recipes", {})
+
+func can_craft(recipe_id: String) -> bool:
+	var recipe: Dictionary = data.get("craft_recipes", {}).get(recipe_id, {})
+	if recipe.is_empty(): return false
+	var cost: Dictionary = recipe.get("cost", {})
+	for frag_id in cost:
+		var needed: int = cost[frag_id]
+		var have: int   = UserProfileManager.fragments.get(frag_id, 0)
+		if have < needed: return false
+	return true
+
+func craft(recipe_id: String) -> bool:
+	if not can_craft(recipe_id): return false
+	var recipe: Dictionary = data.get("craft_recipes", {}).get(recipe_id, {})
+	var cost: Dictionary   = recipe.get("cost", {})
+	for frag_id in cost:
+		UserProfileManager.fragments[frag_id] -= cost[frag_id]
+	var result_id: String = recipe.get("result_id", "")
+	if not result_id.is_empty():
+		if not UserProfileManager.inventory.has(result_id):
+			UserProfileManager.inventory.append(result_id)
+	UserProfileManager.save_wallet()
+	return true