shanshanzhong
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同一 quantity 有两条记录时： - new_user_only=true (discount=99.64) 是新人限制标记，非实际折扣 - new_user_only=false (discount=35.36) 是实际折扣价格 原逻辑遍历到第一条即返回，导致新人拿到 99.64 而非 35.36。 修复后优先取 new_user_only=false 的条目，仅在无 false 条目时才降级到 new_user_only=true。 Co-Authored-By: claude-flow <ruv@ruv.net>
56 lines
2.0 KiB
Go
56 lines
2.0 KiB
Go
package order
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import "github.com/perfect-panel/server/internal/types"
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// getDiscount returns the discount factor for the given quantity.
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//
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// Design: when a quantity has both a new_user_only=true entry and a new_user_only=false entry,
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// the new_user_only=true entry is a "gating marker" (its discount value is irrelevant).
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// The actual discounted price is always carried by the new_user_only=false entry.
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// Whether the buyer is eligible to use this quantity is enforced by isNewUserOnlyForQuantity
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// before calling this function. Here we simply return the best applicable discount.
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//
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// Priority: new_user_only=false entry beats new_user_only=true entry for the same quantity.
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func getDiscount(discounts []types.SubscribeDiscount, inputMonths int64, isNewUser bool) float64 {
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var best float64 = 1
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foundFallback := false
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for _, d := range discounts {
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if d.Quantity != inputMonths || d.Discount <= 0 || d.Discount >= 100 {
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continue
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}
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factor := d.Discount / float64(100)
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if !d.NewUserOnly {
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// Prefer the non-new-user-only tier as the actual price tier.
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best = factor
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foundFallback = true
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} else if !foundFallback && isNewUser {
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// Fall back to new-user-only tier only when no general tier exists
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// and the buyer qualifies.
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best = factor
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}
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}
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return best
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}
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// isNewUserOnlyForQuantity checks whether the matched discount tier has new_user_only enabled.
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// Returns true only when all matching tiers for the given quantity require new-user status
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// (i.e. no fallback tier with new_user_only=false exists). When both a new-user-only tier
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// and a general tier exist for the same quantity, non-new-users can still purchase via the
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// general tier, so this returns false.
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func isNewUserOnlyForQuantity(discounts []types.SubscribeDiscount, inputQuantity int64) bool {
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hasNewUserOnly := false
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hasFallback := false
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for _, d := range discounts {
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if d.Quantity != inputQuantity {
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continue
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}
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if d.NewUserOnly {
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hasNewUserOnly = true
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} else {
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hasFallback = true
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}
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}
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return hasNewUserOnly && !hasFallback
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}
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