赠送套餐逻辑

internal/service/packageprice/policy.go

@@ -0,0 +1,114 @@
+// Package packageprice 提供套餐价格与赠送语义的统一判定逻辑
+// 负责原始价格、价格状态、生效价和赠送限制的集中计算
+package packageprice
+
+import (
+	"github.com/break/junhong_cmp_fiber/internal/model"
+	"github.com/break/junhong_cmp_fiber/pkg/constants"
+	"github.com/break/junhong_cmp_fiber/pkg/errors"
+)
+
+// ResolvePackagePriceState 解析套餐价格状态和落库存储值。
+func ResolvePackagePriceState(isGift bool, rawPrice *int64) (int, int64, error) {
+	if isGift {
+		if rawPrice == nil || *rawPrice != 0 {
+			return 0, 0, errors.New(errors.CodeInvalidParam, "赠送套餐必须显式配置 0 元售价")
+		}
+		return constants.PackagePriceConfigStatusGiftZero, 0, nil
+	}
+
+	if rawPrice == nil {
+		return constants.PackagePriceConfigStatusUnconfigured, 0, nil
+	}
+	if *rawPrice == 0 {
+		return 0, 0, errors.New(errors.CodeInvalidParam, "普通可售套餐不允许显式配置 0 元售价")
+	}
+
+	return constants.PackagePriceConfigStatusConfigured, *rawPrice, nil
+}
+
+// ResolveAllocationPriceState 解析代理分配零售价状态和落库存储值。
+func ResolveAllocationPriceState(rawPrice *int64) (int, int64, error) {
+	if rawPrice == nil {
+		return constants.PackagePriceConfigStatusUnconfigured, 0, nil
+	}
+	if *rawPrice == 0 {
+		return 0, 0, errors.New(errors.CodeInvalidParam, "普通可售套餐不允许显式配置 0 元零售价")
+	}
+
+	return constants.PackagePriceConfigStatusConfigured, *rawPrice, nil
+}
+
+// PackageEffectiveRetailPrice 返回套餐生效售价。
+func PackageEffectiveRetailPrice(pkg *model.Package) int64 {
+	if pkg == nil {
+		return 0
+	}
+
+	switch pkg.PriceConfigStatus {
+	case constants.PackagePriceConfigStatusGiftZero:
+		return 0
+	case constants.PackagePriceConfigStatusConfigured:
+		return pkg.SuggestedRetailPrice
+	default:
+		return pkg.CostPrice
+	}
+}
+
+// PackageRawSuggestedRetailPrice 返回套餐原始建议售价。
+func PackageRawSuggestedRetailPrice(pkg *model.Package) *int64 {
+	if pkg == nil || pkg.PriceConfigStatus == constants.PackagePriceConfigStatusUnconfigured {
+		return nil
+	}
+	price := pkg.SuggestedRetailPrice
+	return &price
+}
+
+// AllocationEffectiveRetailPrice 返回代理分配记录生效零售价。
+func AllocationEffectiveRetailPrice(allocation *model.ShopPackageAllocation) int64 {
+	if allocation == nil {
+		return 0
+	}
+	if allocation.RetailPriceConfigStatus == constants.PackagePriceConfigStatusUnconfigured {
+		return allocation.CostPrice
+	}
+	return allocation.RetailPrice
+}
+
+// AllocationRawRetailPrice 返回代理分配记录原始零售价。
+func AllocationRawRetailPrice(allocation *model.ShopPackageAllocation) *int64 {
+	if allocation == nil || allocation.RetailPriceConfigStatus == constants.PackagePriceConfigStatusUnconfigured {
+		return nil
+	}
+	price := allocation.RetailPrice
+	return &price
+}
+
+// ContainsGiftPackage 判断套餐列表中是否包含赠送套餐。
+func ContainsGiftPackage(packages []*model.Package) bool {
+	for _, pkg := range packages {
+		if pkg != nil && pkg.IsGift {
+			return true
+		}
+	}
+	return false
+}
+
+// ValidateGiftAdminOrder 校验后台赠送订单约束。
+func ValidateGiftAdminOrder(packages []*model.Package) error {
+	if !ContainsGiftPackage(packages) {
+		return nil
+	}
+	if len(packages) != 1 {
+		return errors.New(errors.CodeInvalidParam, "赠送套餐必须单独创建订单")
+	}
+	for _, pkg := range packages {
+		if pkg == nil {
+			continue
+		}
+		if !pkg.IsGift {
+			return errors.New(errors.CodeInvalidParam, "赠送订单不能混入普通可售套餐")
+		}
+	}
+	return nil
+}