shanshanzhong
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56 lines
1.7 KiB
Go
56 lines
1.7 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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// - New user: pick the tier with the lowest discount value (biggest saving).
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// - Non-new user: pick the tier with the highest discount value (least saving / closest to full price).
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func getDiscount(discounts []types.SubscribeDiscount, inputMonths int64, isNewUser bool) float64 {
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best := float64(-1)
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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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if d.NewUserOnly && !isNewUser {
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continue
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}
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if isNewUser {
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// lowest discount value = biggest saving
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if best < 0 || d.Discount < best {
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best = d.Discount
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}
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} else {
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// highest discount value = least saving (closest to original price)
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if best < 0 || d.Discount > best {
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best = d.Discount
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}
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}
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}
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if best < 0 {
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return 1
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}
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return best / float64(100)
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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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