update

internal/pkg/season/season.go

@@ -0,0 +1,71 @@
+// Package season 走秀季节 / 年份 → season_code 的推导与解析辅助。
+//
+// season_code 是对外与排序共用的紧凑编码：SS26 / FW25 / RES26 / PF25，
+// 规则：前缀由 collection_type（rtw/menswear→SS/FW；resort→RES；pre_fall→PF）
+// 或 season（spring→SS / fall→FW）决定，后缀为两位年份。
+// 历史代码 vogue.go 漏填 season_code 是已知 bug，这里集中推导逻辑，worker 与回填脚本复用。
+package season
+
+import (
+	"strconv"
+)
+
+// CollectionType / Season 取值白名单。
+const (
+	ColRTW      = "rtw"
+	ColMenswear = "menswear"
+	ColCouture  = "couture"
+	ColResort   = "resort"
+	ColPreFall  = "pre_fall"
+
+	SeasonSpring = "spring"
+	SeasonFall   = "fall"
+)
+
+// Derive 由年份 + 系列/季节推导 season_code（如 2026 + spring → "SS26"）。
+//
+// 优先级：collection_type 先在（resort→RES、pre_fall→PF）；否则用 season
+// （spring→SS、fall→FW）；二者皆空或无法识别时回落 "SS"。
+// year 为 0 时返回空串（未知年份无法编码）。
+func Derive(year uint16, collectionType, season string) string {
+	if year == 0 {
+		return ""
+	}
+	prefix := prefixOf(collectionType, season)
+	return prefix + twoDigit(year)
+}
+
+func prefixOf(collectionType, season string) string {
+	switch collectionType {
+	case ColResort:
+		return "RES"
+	case ColPreFall:
+		return "PF"
+	case ColCouture:
+		// 高定沿用秋冬编码（FW），与排序优先级一致
+		return "FW"
+	case ColMenswear:
+		return "FW"
+	case ColRTW:
+		return "SS"
+	}
+	switch season {
+	case SeasonFall:
+		return "FW"
+	case SeasonSpring:
+		return "SS"
+	}
+	return "SS"
+}
+
+// twoDigit 取年份后两位（2026 → "26"）。
+func twoDigit(year uint16) string {
+	if year >= 2000 {
+		year -= 2000
+	}
+	s := strconv.Itoa(int(year))
+	if len(s) > 2 {
+		s = s[len(s)-2:]
+	}
+	return s
+}

internal/pkg/season/season_test.go

@@ -0,0 +1,28 @@
+package season
+
+import "testing"
+
+func TestDerive(t *testing.T) {
+	cases := []struct {
+		year   uint16
+		col    string
+		season string
+		want   string
+	}{
+		{2026, ColRTW, SeasonSpring, "SS26"},
+		{2025, "", SeasonFall, "FW25"},
+		{2026, ColResort, "", "RES26"},
+		{2026, ColPreFall, "", "PF26"},
+		{2025, ColMenswear, "", "FW25"},
+		{2025, ColCouture, "", "FW25"},
+		{2026, "", "", "SS26"},        // 二者皆空回落 SS
+		{0, ColRTW, SeasonSpring, ""}, // 未知年份无法编码
+		{2099, ColRTW, SeasonSpring, "SS99"},
+	}
+	for _, c := range cases {
+		got := Derive(c.year, c.col, c.season)
+		if got != c.want {
+			t.Fatalf("Derive(%d,%q,%q)=%q want %q", c.year, c.col, c.season, got, c.want)
+		}
+	}
+}