package order

import "github.com/perfect-panel/server/internal/types"

func getDiscount(discounts []types.SubscribeDiscount, inputMonths int64, isNewUser bool) float64 {
	for _, discount := range discounts {
		if discount.NewUserOnly && !isNewUser {
			continue
		}
		if inputMonths == discount.Quantity && discount.Discount > 0 && discount.Discount < 100 {
			return discount.Discount / float64(100)
		}
	}

	return 1
}

// isNewUserOnlyForQuantity checks whether the matched discount tier has new_user_only enabled.
// Returns true only when all matching tiers for the given quantity require new-user status
// (i.e. no fallback tier with new_user_only=false exists). When both a new-user-only tier
// and a general tier exist for the same quantity, non-new-users can still purchase via the
// general tier, so this returns false.
func isNewUserOnlyForQuantity(discounts []types.SubscribeDiscount, inputQuantity int64) bool {
	hasNewUserOnly := false
	hasFallback := false
	for _, d := range discounts {
		if d.Quantity != inputQuantity {
			continue
		}
		if d.NewUserOnly {
			hasNewUserOnly = true
		} else {
			hasFallback = true
		}
	}
	return hasNewUserOnly && !hasFallback
}