@core / discounts

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优惠码与自动折扣：百分比、固定金额、包邮、按商品或分类、使用次数和首单限制

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@core/discounts — rules for AI agents

Purpose

Discount codes and automatic discounts for @core/cart: percent, fixed amount or free shipping; optional scope by product or category slugs, minimum order, start/end dates, total and per-customer usage limits, first-order-only and combinability (non-combinable ones compete: the biggest wins). Registers the discounts (100) and free-shipping (250) totals steps and records redemptions inside the transaction that creates/pays the order (onOrderPaidTx of @core/orders), with the discount row locked. Limits count recorded redemptions plus open payments carrying the code (pendingCodeUses of @core/cart, fed by @core/checkout). If a limit was exceeded anyway (the customer already paid), the order is kept, the redemption recorded and a discount_over_limit event is added to the order timeline for review. Tables: discounts, discount_redemptions.

Map

index.ts — public API: upsertDiscount, DiscountInput, discountsStep, freeShippingStep, recordRedemptions, discountsAdminResource.
discounts.ts — validation, application and the redemption handler (registered on import). admin.ts — admin resource.

Integration

Migrations as in src/lib/db/AGENTS.md. Import this module at startup (it registers its steps and handler).
Cart page: a code field calling PUT /api/cart/codes {codes: [code]} (@core/cart); show totals.discounts and any invalid_code issues.
Pass the customer email to computeTotals(cart, { email }) once known so per-customer and first-order limits apply.
Add discountsAdminResource to src/genpm/admin.ts (permissions discounts:read|update).
Verify: create TEN (10 %), apply it, the total drops and each line shows its share.

Conventions

Codes are stored uppercase (A–Z 0–9 _ -); values: percent 1–100, fixed in minor units.
Deleting a discount deactivates it (redemption history stays).
Free-shipping adjustments carry their code (amount 0), so they count towards usage limits.
Check the order timeline (discount_over_limit) when a usage-limited campaign ends.
Prefer automatic discounts for store-wide sales; codes for campaigns.

Don't

Don't show a "was" price or a percentage off that isn't real: in the EU a price reduction must refer to the lowest price of the previous 30 days (Omnibus Directive). Use @core/pricing's price history for compare-at prices.
Don't apply discounts on the client or trust discount amounts sent by the browser.
Don't create fake urgency (countdowns that reset, "only today" when it isn't).

# @core/discounts — rules for AI agents

## Purpose
Discount codes and automatic discounts for @core/cart: percent, fixed amount or free shipping; optional scope by
product or category slugs, minimum order, start/end dates, total and per-customer usage limits, first-order-only and
combinability (non-combinable ones compete: the biggest wins). Registers the `discounts` (100) and `free-shipping`
(250) totals steps and records redemptions inside the transaction that creates/pays the order (`onOrderPaidTx` of
@core/orders), with the discount row locked. Limits count recorded redemptions plus open payments carrying the code
(`pendingCodeUses` of @core/cart, fed by @core/checkout). If a limit was exceeded anyway (the customer already paid),
the order is kept, the redemption recorded and a `discount_over_limit` event is added to the order timeline for review.
Tables: `discounts`, `discount_redemptions`.

## Map
- `index.ts` — public API: `upsertDiscount`, `DiscountInput`, `discountsStep`, `freeShippingStep`, `recordRedemptions`, `discountsAdminResource`.
- `discounts.ts` — validation, application and the redemption handler (registered on import). `admin.ts` — admin resource.

## Integration
1. Migrations as in `src/lib/db/AGENTS.md`. Import this module at startup (it registers its steps and handler).
2. Cart page: a code field calling `PUT /api/cart/codes {codes: [code]}` (@core/cart); show `totals.discounts` and any `invalid_code` issues.
3. Pass the customer email to `computeTotals(cart, { email })` once known so per-customer and first-order limits apply.
4. Add `discountsAdminResource` to `src/genpm/admin.ts` (permissions `discounts:read|update`).
5. Verify: create `TEN` (10 %), apply it, the total drops and each line shows its share.

## Conventions
- Codes are stored uppercase (`A–Z 0–9 _ -`); values: percent 1–100, fixed in minor units.
- Deleting a discount deactivates it (redemption history stays).
- Free-shipping adjustments carry their `code` (amount 0), so they count towards usage limits.
- Check the order timeline (`discount_over_limit`) when a usage-limited campaign ends.
- Prefer automatic discounts for store-wide sales; codes for campaigns.

## Don't
- Don't show a "was" price or a percentage off that isn't real: in the EU a price reduction must refer to the lowest
  price of the previous 30 days (Omnibus Directive). Use @core/pricing's price history for compare-at prices.
- Don't apply discounts on the client or trust discount amounts sent by the browser.
- Don't create fake urgency (countdowns that reset, "only today" when it isn't).

应用 .genpmignore 后将被注入的确切目录树。固定于

src/lib/discounts/LICENSE只读 · 6b23d34

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