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
+}

server-go/internal/service/farm_stats_test.go

@@ -0,0 +1,26 @@
+package service
+
+import "testing"
+
+func TestAggregateProductionLoss(t *testing.T) {
+	rows := []ProductionLossRow{
+		{RoomID: "room-a", DeathCount: 10, CulledCount: 2, YieldKg: 5, LossKg: 1, CostAmount: 20, RecordCount: 1},
+		{RoomID: "room-a", DeathCount: 3, CulledCount: 1, YieldKg: 2, LossKg: 0.5, CostAmount: 30, RecordCount: 1},
+	}
+	stats := AggregateProductionLoss(rows)
+	if len(stats) != 1 {
+		t.Fatalf("stats len = %d, want 1", len(stats))
+	}
+	if stats[0].DeathCount != 13 || stats[0].CulledCount != 3 || stats[0].CostAmount != 50 {
+		t.Fatalf("unexpected aggregate: %+v", stats[0])
+	}
+	if stats[0].RecordCount != 2 {
+		t.Fatalf("record count = %d, want 2", stats[0].RecordCount)
+	}
+}
+
+func TestAggregateProductionLossEmpty(t *testing.T) {
+	if stats := AggregateProductionLoss(nil); len(stats) != 0 {
+		t.Fatalf("empty input should return empty, got %d", len(stats))
+	}
+}