chore: 同步本地 v9 整改与运营能力

server-go/internal/service/farm_stats.go

@@ -0,0 +1,53 @@
+package service
+
+// ProductionLossRow 产量损失统计原始行。
+type ProductionLossRow struct {
+	BatchID     string  `gorm:"column:batch_id"`
+	RoomID      string  `gorm:"column:room_id"`
+	DeathCount  int64   `gorm:"column:death_count"`
+	CulledCount int64   `gorm:"column:culled_count"`
+	YieldKg     float64 `gorm:"column:yield_kg"`
+	LossKg      float64 `gorm:"column:loss_kg"`
+	CostAmount  float64 `gorm:"column:cost_amount"`
+	RecordCount int64   `gorm:"column:record_count"`
+}
+
+// ProductionLossStat 按房间/批次聚合后的产量损失统计。
+type ProductionLossStat struct {
+	BatchID     string  `json:"batchId"`
+	RoomID      string  `json:"roomId"`
+	RoomName    string  `json:"roomName,omitempty"`
+	BatchName   string  `json:"batchName,omitempty"`
+	DeathCount  int64   `json:"deathCount"`
+	CulledCount int64   `json:"culledCount"`
+	YieldKg     float64 `json:"yieldKg"`
+	LossKg      float64 `json:"lossKg"`
+	CostAmount  float64 `json:"costAmount"`
+	RecordCount int64   `json:"recordCount"`
+}
+
+// AggregateProductionLoss 聚合产量损失记录；空输入返回空数组。
+func AggregateProductionLoss(rows []ProductionLossRow) []ProductionLossStat {
+	byKey := make(map[string]*ProductionLossStat)
+	var order []string
+	for _, r := range rows {
+		key := r.RoomID + "|" + r.BatchID
+		stat, ok := byKey[key]
+		if !ok {
+			stat = &ProductionLossStat{RoomID: r.RoomID, BatchID: r.BatchID}
+			byKey[key] = stat
+			order = append(order, key)
+		}
+		stat.DeathCount += r.DeathCount
+		stat.CulledCount += r.CulledCount
+		stat.YieldKg += r.YieldKg
+		stat.LossKg += r.LossKg
+		stat.CostAmount += r.CostAmount
+		stat.RecordCount += r.RecordCount
+	}
+	result := make([]ProductionLossStat, 0, len(order))
+	for _, key := range order {
+		result = append(result, *byKey[key])
+	}
+	return result
+}