实现库存管理相关逻辑

internal/app/dto/inventory_converter.go

@@ -0,0 +1,66 @@
+package dto
+
+import (
+	"time"
+
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
+)
+
+// ConvertCurrentStockToDTO 将原料及其最新库存日志转换为 CurrentStockResponse DTO
+func ConvertCurrentStockToDTO(material *models.RawMaterial, latestLog *models.RawMaterialStockLog) *CurrentStockResponse {
+	if material == nil {
+		return nil
+	}
+
+	stock := float32(0)
+	lastUpdated := material.CreatedAt.Format(time.RFC3339) // 默认使用创建时间
+
+	if latestLog != nil {
+		stock = latestLog.AfterQuantity
+		lastUpdated = latestLog.HappenedAt.Format(time.RFC3339)
+	}
+
+	return &CurrentStockResponse{
+		RawMaterialID:   material.ID,
+		RawMaterialName: material.Name,
+		Stock:           stock,
+		LastUpdated:     lastUpdated,
+	}
+}
+
+// ConvertStockLogToDTO 将 models.RawMaterialStockLog 转换为 StockLogResponse DTO
+func ConvertStockLogToDTO(log *models.RawMaterialStockLog) *StockLogResponse {
+	if log == nil {
+		return nil
+	}
+
+	return &StockLogResponse{
+		ID:              log.ID,
+		RawMaterialID:   log.RawMaterialID,
+		RawMaterialName: log.RawMaterial.Name, // 假设 RawMaterial 已被预加载
+		ChangeAmount:    log.ChangeAmount,
+		BeforeQuantity:  log.BeforeQuantity,
+		AfterQuantity:   log.AfterQuantity,
+		SourceType:      string(log.SourceType),
+		SourceID:        log.SourceID,
+		HappenedAt:      log.HappenedAt,
+		Remarks:         log.Remarks,
+	}
+}
+
+// ConvertStockLogListToDTO 将 []models.RawMaterialStockLog 转换为 ListStockLogResponse DTO
+func ConvertStockLogListToDTO(logs []models.RawMaterialStockLog, total int64, page, pageSize int) *ListStockLogResponse {
+	logDTOs := make([]StockLogResponse, len(logs))
+	for i, log := range logs {
+		logDTOs[i] = *ConvertStockLogToDTO(&log)
+	}
+
+	return &ListStockLogResponse{
+		List: logDTOs,
+		Pagination: PaginationDTO{
+			Page:     page,
+			PageSize: pageSize,
+			Total:    total,
+		},
+	}
+}