feat(server-go): 区域发病统计（#22，rooms.region + region-stats）

2026-08-13 08:53:00 +08:00
parent 15f09dcdee
commit 7949f90c0c
4 changed files with 106 additions and 0 deletions
@@ -0,0 +1,44 @@
+package service
+
+import "sort"
+
+// RegionDiseaseEntry 区域发病条目（trace_records 联查 rooms 得到）
+type RegionDiseaseEntry struct {
+	Region  string
+	Disease string
+}
+
+// RegionStat 区域发病统计
+type RegionStat struct {
+	Region   string         `json:"region"`
+	Total    int            `json:"total"`
+	Diseases map[string]int `json:"diseases"`
+}
+
+// AggregateRegionStats 按区域分组统计发病数与病种分布（空区域剔除，按总数降序）
+func AggregateRegionStats(entries []RegionDiseaseEntry) []RegionStat {
+	byRegion := make(map[string]*RegionStat)
+	for _, e := range entries {
+		if e.Region == "" {
+			continue
+		}
+		s, ok := byRegion[e.Region]
+		if !ok {
+			s = &RegionStat{Region: e.Region, Diseases: map[string]int{}}
+			byRegion[e.Region] = s
+		}
+		s.Total++
+		s.Diseases[e.Disease]++
+	}
+	result := make([]RegionStat, 0, len(byRegion))
+	for _, s := range byRegion {
+		result = append(result, *s)
+	}
+	sort.Slice(result, func(i, j int) bool {
+		if result[i].Total != result[j].Total {
+			return result[i].Total > result[j].Total
+		}
+		return result[i].Region < result[j].Region
+	})
+	return result
+}