baseline: 批次A-D 成果 + membership 半成品（测试红）
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"""配额校验（批次 C1）：`check_and_count(tenant, kind)` 统一入口。
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kind 取值与 `Plan.limits` 的键对应：
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- users / products / bills_monthly → 数量型（达到即拒）
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- ai_parse_order / ai_ask → 复用给 apps.ai.usage.quota_for()
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- batch_managed / finance_ledger → 功能开关（False 即拒）
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- storefront → 功能开关
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调用方拿到 QuotaExceeded 后翻译成 403 + 升级引导（见 views / 业务拦截点）。
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"""
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from __future__ import annotations
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from django.db.models import Count, Sum
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from .models import Plan, Subscription, get_subscription
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class QuotaExceeded(Exception):
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"""超出套餐限制。payload 供前端弹"升级引导"（列差距 + 跳价格页）。"""
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def __init__(self, kind: str, used, limit, plan_code: str, plan_name: str,
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upgrade_hint: str = ""):
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self.kind = kind
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self.used = used
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self.limit = limit
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self.plan_code = plan_code
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self.plan_name = plan_name
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self.upgrade_hint = upgrade_hint or "升级套餐即可解除限制"
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super().__init__(f"quota exceeded for {kind}: {used}/{limit} @ {plan_code}")
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def as_dict(self) -> dict:
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return {
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"code": "quota_exceeded",
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"kind": self.kind,
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"detail": f"{self.kind} 已达 {self.used}/{self.limit} 上限（当前套餐：{self.plan_name}），{self.upgrade_hint}",
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"used": float(self.used) if isinstance(self.used, (int, float)) else self.used,
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"limit": float(self.limit) if isinstance(self.limit, (int, float)) else self.limit,
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"plan_code": self.plan_code,
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"plan_name": self.plan_name,
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"upgrade_url": "/#/pricing",
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}
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def limits_for(tenant) -> dict:
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return get_subscription(tenant).effective_limits()
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def plan_of(tenant) -> Plan:
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return get_subscription(tenant).plan
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def _count_users(tenant) -> int:
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"""该租户下的活跃用户数（经审计日志里出现过的操作者去重）。
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注：当前用户表尚未挂 tenant 外键（阶段 1 只做了 Org/租户字段预留），
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故用"在该租户留下过审计记录的用户数"作为保守口径；
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接入成员表后替换此函数即可，调用方无需改动。
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"""
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from apps.core.models import AuditLog
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return (
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AuditLog.objects.filter(tenant=tenant, user__isnull=False)
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.values("user_id")
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.distinct()
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.count()
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)
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def _count_products(tenant) -> int:
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from apps.catalog.models import Product
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return Product.objects.filter(tenant=tenant, is_deleted=False).count()
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def _count_bills_monthly(tenant) -> int:
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"""本月单据量 = 销售单 + 进货单（草稿与已过账都算，is_deleted 排除）。"""
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from datetime import date
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from apps.purchase.models import PurchaseBill
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from apps.sales.models import SalesBill
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today = date.today()
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month_start = today.replace(day=1)
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sales = SalesBill.objects.filter(
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tenant=tenant, is_deleted=False, bill_date__gte=month_start
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).count()
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purchase = PurchaseBill.objects.filter(
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tenant=tenant, is_deleted=False, bill_date__gte=month_start
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).count()
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return sales + purchase
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COUNTERS = {
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"users": _count_users,
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"products": _count_products,
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"bills_monthly": _count_bills_monthly,
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}
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FEATURE_FLAGS = {"batch_managed", "finance_ledger", "storefront"}
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def usage_snapshot(tenant) -> dict:
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"""当前用量 vs 限额（前端"套餐用量"页 + 升级引导弹窗的数据源）。"""
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sub = get_subscription(tenant)
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limits = sub.effective_limits()
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snap = {
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"plan": {
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"code": sub.plan.code, "name": sub.plan.name,
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"price_monthly": float(sub.plan.price_monthly),
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},
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"status": sub.status,
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"trial_ends_at": sub.trial_ends_at.isoformat() if sub.trial_ends_at else None,
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"trial_expired": sub.is_trial_expired,
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"period_end": sub.period_end.isoformat() if sub.period_end else None,
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"items": [],
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}
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for kind, fn in COUNTERS.items():
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limit = int(limits.get(kind) or 0)
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used = fn(tenant)
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snap["items"].append({
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"kind": kind,
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"used": used,
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"limit": limit,
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"unlimited": limit == 0,
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"percent": None if limit == 0 else round(used / limit * 100, 1),
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})
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# AI 次数（复用 ai.usage）
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from apps.ai import usage as ai_usage
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for kind in (ai_usage.KIND_PARSE_ORDER, ai_usage.KIND_ASK):
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limit = int(limits.get(f"ai_{kind}") or 0)
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used = ai_usage.monthly_count(tenant, kind)
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snap["items"].append({
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"kind": f"ai_{kind}",
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"used": used,
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"limit": limit,
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"unlimited": limit == 0,
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"percent": None if limit == 0 else round(used / limit * 100, 1),
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})
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snap["features"] = {k: bool(limits.get(k)) for k in FEATURE_FLAGS}
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return snap
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def check_and_count(tenant, kind: str, *, delta: int = 1) -> dict:
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"""配额校验统一入口。
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数量型：used + delta > limit → 拒（limit=0 视为不限）
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功能开关：limits[kind] 为假 → 拒
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AI 次数：交给 apps.ai.usage.check_quota（保持单一实现）
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返回 {used, limit, remaining} 或抛 QuotaExceeded。
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"""
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sub = get_subscription(tenant)
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limits = sub.effective_limits()
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plan = sub.plan
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if kind in COUNTERS:
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limit = int(limits.get(kind) or 0)
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used = COUNTERS[kind](tenant)
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if limit > 0 and used + delta > limit:
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raise QuotaExceeded(kind, used, limit, plan.code, plan.name,
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upgrade_hint=_hint_for(kind))
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return {
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"kind": kind, "used": used, "limit": limit,
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"remaining": (limit - used) if limit > 0 else None,
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}
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if kind in FEATURE_FLAGS:
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if not limits.get(kind):
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raise QuotaExceeded(kind, 0, 0, plan.code, plan.name,
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upgrade_hint=f"{_label(kind)}需专业版")
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return {"kind": kind, "enabled": True}
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if kind.startswith("ai_"):
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from apps.ai import usage as ai_usage
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out = ai_usage.check_quota(tenant, kind[3:]) # ai_usage 内部已抛自己的 QuotaExceeded
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return out
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raise ValueError(f"unknown quota kind: {kind}")
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def _label(kind: str) -> str:
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return {
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"users": "用户数", "products": "商品数", "bills_monthly": "月度单据量",
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"ai_parse_order": "AI 录单次数", "ai_ask": "AI 问答次数",
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"batch_managed": "批次效期管理", "finance_ledger": "总账核算",
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"storefront": "订货商城",
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}.get(kind, kind)
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def _hint_for(kind: str) -> str:
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return {
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"users": "升级到基础版可加到 5 个用户，专业版 50 个",
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"products": "升级到基础版可管 3000 个商品",
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"bills_monthly": "升级到专业版不限制单据量",
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"ai_parse_order": "升级套餐可获得更多 AI 录单次数",
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"ai_ask": "升级套餐可获得更多 AI 问答次数",
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}.get(kind, "升级套餐即可解除限制")
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# ------------------------------------------------------------
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# 供 apps.ai 反向调用（billing 未安装时 ai 会回落到 settings）
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# ------------------------------------------------------------
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def quota_for(tenant, kind: str) -> int:
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"""返回某配额项的月度/总量上限（0 = 不限）。apps.ai.usage 优先调用本函数。"""
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limits = limits_for(tenant)
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return int(limits.get(kind) or 0)
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