feat(server-go): 蚕房健康画像与年度发病统计（#24）

server-go/internal/service/health_profile.go

@@ -0,0 +1,87 @@
+package service
+
+import (
+	"sort"
+	"strings"
+)
+
+// HealthInput 健康画像输入
+type HealthInput struct {
+	RecentRiskLevels  []string // 近 30 天巡检风险等级
+	LampPositive      int
+	LampTotal         int
+	ConsultationCount int
+	TraceCount        int
+}
+
+// ComputeHealthScore 综合健康分（0-100）与评级（优/良/中/差）
+func ComputeHealthScore(in HealthInput) (float64, string) {
+	score := 100.0
+	for _, level := range in.RecentRiskLevels {
+		switch level {
+		case "red":
+			score -= 25
+		case "orange":
+			score -= 12
+		case "yellow":
+			score -= 4
+		}
+	}
+	if in.LampTotal > 0 {
+		score -= float64(in.LampPositive) / float64(in.LampTotal) * 30
+	}
+	score -= float64(in.ConsultationCount) * 10
+	score -= float64(in.TraceCount) * 8
+	if score < 0 {
+		score = 0
+	}
+	if score > 100 {
+		score = 100
+	}
+	grade := "差"
+	switch {
+	case score >= 85:
+		grade = "优"
+	case score >= 70:
+		grade = "良"
+	case score >= 55:
+		grade = "中"
+	}
+	return score, grade
+}
+
+// MonthDiseaseEntry 月度发病条目
+type MonthDiseaseEntry struct {
+	Month   string
+	Disease string
+}
+
+// MonthStat 月度发病统计
+type MonthStat struct {
+	Month    string         `json:"month"`
+	Total    int            `json:"total"`
+	Diseases map[string]int `json:"diseases"`
+}
+
+// AggregateMonthlyStats 按月份聚合发病数与病种分布（升序）
+func AggregateMonthlyStats(entries []MonthDiseaseEntry) []MonthStat {
+	byMonth := make(map[string]*MonthStat)
+	for _, e := range entries {
+		if strings.TrimSpace(e.Month) == "" {
+			continue
+		}
+		s, ok := byMonth[e.Month]
+		if !ok {
+			s = &MonthStat{Month: e.Month, Diseases: map[string]int{}}
+			byMonth[e.Month] = s
+		}
+		s.Total++
+		s.Diseases[e.Disease]++
+	}
+	result := make([]MonthStat, 0, len(byMonth))
+	for _, s := range byMonth {
+		result = append(result, *s)
+	}
+	sort.Slice(result, func(i, j int) bool { return result[i].Month < result[j].Month })
+	return result
+}