f

internal/domains/api/services/processors/jrzq/decode_interval.go

@@ -0,0 +1,85 @@
+package jrzq
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+)
+
+// DecodeIntervalMidpoint 将 xyp 区间码解码为区间中位整数。
+func DecodeIntervalMidpoint(field, code string) int {
+	if code == "" || code == "0" {
+		return 0
+	}
+	rules, ok := loanRiskIntervalMappings[field]
+	if !ok {
+		return 0
+	}
+	for _, rule := range rules {
+		if rule.output != code {
+			continue
+		}
+		min := rule.min
+		max := rule.max
+		if max >= math.MaxFloat64/4 {
+			if rule.minInclusive {
+				return int(math.Round(min + 1))
+			}
+			return int(math.Round(min + 2))
+		}
+		lo := min
+		hi := max
+		if !rule.minInclusive {
+			lo += 0.5
+		}
+		if !rule.maxInclusive {
+			hi -= 0.5
+		}
+		return int(math.Round((lo + hi) / 2))
+	}
+	return 0
+}
+
+// FormatLoanRiskInterval 将 xyp 区间码格式化为可读区间字符串。
+func FormatLoanRiskInterval(field, code string) string {
+	if code == "" || code == "0" {
+		return "0"
+	}
+	rules, ok := loanRiskIntervalMappings[field]
+	if !ok {
+		return "0"
+	}
+	for _, rule := range rules {
+		if rule.output != code {
+			continue
+		}
+		return formatIntervalBounds(rule.min, rule.max, rule.minInclusive, rule.maxInclusive)
+	}
+	return "0"
+}
+
+func formatIntervalBounds(min, max float64, minInclusive, maxInclusive bool) string {
+	if max >= math.MaxFloat64/4 {
+		left := "("
+		if minInclusive {
+			left = "["
+		}
+		return fmt.Sprintf("%s%s,+)", left, formatBound(min))
+	}
+	left := "("
+	if minInclusive {
+		left = "["
+	}
+	right := ")"
+	if maxInclusive {
+		right = "]"
+	}
+	return fmt.Sprintf("%s%s,%s%s", left, formatBound(min), formatBound(max), right)
+}
+
+func formatBound(v float64) string {
+	if v == float64(int64(v)) {
+		return strconv.FormatInt(int64(v), 10)
+	}
+	return strconv.FormatFloat(v, 'f', -1, 64)
+}