package ingest

import "strings"

// ParseCollection 从走秀标题解析出 collection_type 与 season。
//
// 仅输出后端白名单枚举（与 backend_v2/internal/pkg/season.Derive 一致）：
//   collection_type ∈ {rtw, menswear, couture, resort, pre_fall}
//   season          ∈ {spring, fall}（resort/pre_fall 无 spring/fall 词，season 留空，由 Derive 按 collection 前缀补码）
//
// 常见 Vogue 标题形态：
//   "Fall 2024 Ready-to-Wear"  → (rtw, fall)
//   "Spring 2024 Menswear"     → (menswear, spring)
//   "Fall 2024 Couture"        → (couture, fall)
//   "Resort 2024"              → (resort, "")
//   "Pre-Fall 2024"            → (pre_fall, "")
// "Cruise" 视作 resort 的同义表述（Vogue 两词混用）；未识别到系列词时兜底为 rtw（成衣）。
func ParseCollection(title string) (collectionType, season string) {
	t := strings.ToLower(title)

	// season：仅 spring / fall 两种
	switch {
	case strings.Contains(t, "spring"):
		season = "spring"
	case strings.Contains(t, "fall"):
		season = "fall"
	}

	// collection_type：按关键字优先级匹配，最后兜底 rtw
	switch {
	case strings.Contains(t, "menswear"), strings.Contains(t, "men's"):
		collectionType = "menswear"
	case strings.Contains(t, "couture"):
		collectionType = "couture"
	case strings.Contains(t, "resort"), strings.Contains(t, "cruise"):
		collectionType = "resort"
	case strings.Contains(t, "pre-fall"), strings.Contains(t, "pre fall"), strings.Contains(t, "prefall"):
		collectionType = "pre_fall"
	case strings.Contains(t, "ready-to-wear"), strings.Contains(t, "ready to wear"), strings.Contains(t, "rtw"):
		collectionType = "rtw"
	default:
		collectionType = "rtw"
	}
	return collectionType, season
}