528 lines
21 KiB
Go
528 lines
21 KiB
Go
package tokenhub
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqlmodel"
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)
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// outfitCategories 穿搭推荐支持的衣物大类,与 mysqlmodel.Clothes.CategoryMain 取值对齐。
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var outfitCategories = []string{"上装", "下装", "连衣裙", "外套", "鞋", "配饰"}
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// 完整性规则涉及的品类常量(取值必须与 outfitCategories 一致)。
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const (
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categoryTop = "上装"
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categoryBottom = "下装"
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categoryDress = "连衣裙"
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categoryCoat = "外套"
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categoryShoes = "鞋"
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)
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// RecommendLLMItem 大模型返回的单品推荐。
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type RecommendLLMItem struct {
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Type string `json:"type"` // 品类:上装/下装/连衣裙/外套/鞋/配饰
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ClothesID int64 `json:"clothes_id"` // 衣橱衣物 ID
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ClothesUUID string `json:"clothes_uuid"` // 衣橱衣物 UUID
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Reason string `json:"reason"` // 选择理由
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}
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// RecommendLLMResponse 大模型返回的穿搭推荐。
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type RecommendLLMResponse struct {
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OutfitName string `json:"outfit_name"`
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Description string `json:"description"`
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Style string `json:"style"` // 穿搭风格
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Scene string `json:"scene"` // 适合场景
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Items []RecommendLLMItem `json:"items"`
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}
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// GenerateOutfitRecommendation 调用混元生成今日穿搭推荐。
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// scene 为用户自定义场景(前端 scene_type=2 时传入),为空表示由模型自行判断。
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// retryHint 为「上次输出不完整」时的服务端纠偏提示(由本包 BuildCorrectionHint /
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// CorrectionHintStrictSelection 生成,不含用户输入);为空表示首次调用。
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func (c *Client) GenerateOutfitRecommendation(ctx context.Context, zodiac string, fortune *FortuneItem, clothes []mysqlmodel.Clothes, scene, retryHint string) (*RecommendLLMResponse, error) {
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messages := []Message{
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{Role: "user", Content: buildRecommendPrompt(zodiac, fortune, clothes, scene, retryHint)},
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}
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responseFormat := &ResponseFormat{
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Type: "json_schema",
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JSONSchema: &JSONSchema{
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Name: "outfit_recommendation",
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Schema: buildRecommendSchema(),
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},
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}
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data, err := c.ChatCompletion(ctx, messages, responseFormat)
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if err != nil {
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return nil, fmt.Errorf("call hunyuan for outfit recommend: %w", err)
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}
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var cr chatResponse
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if err := json.Unmarshal(data, &cr); err != nil {
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return nil, fmt.Errorf("unmarshal chat response: %w", err)
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}
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if len(cr.Choices) == 0 {
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return nil, fmt.Errorf("no choices in response")
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}
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var result RecommendLLMResponse
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content := sanitizeJSONContent(cr.Choices[0].Message.Content)
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if err := json.Unmarshal([]byte(content), &result); err != nil {
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return nil, fmt.Errorf("unmarshal outfit recommend json: %w, raw=%s", err, content)
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}
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return &result, nil
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}
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// buildRecommendPrompt 构造穿搭推荐 prompt。
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// scene 为用户自定义场景(已做注入清洗):非空时作为硬约束写入 prompt,并指示模型在 scene 字段回填;
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// 为空时整段不出现,保持「由模型自行判断场景」的原行为。
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// retryHint 为本包生成的纠偏提示(不含用户输入);为空时整段不出现。
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func buildRecommendPrompt(zodiac string, fortune *FortuneItem, clothes []mysqlmodel.Clothes, scene, retryHint string) string {
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clothesText := FormatClothesInfo(clothes)
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sceneSection := ""
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if s := sanitizePromptField(scene); s != "" {
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sceneSection = fmt.Sprintf("\n## 用户指定场景\n用户希望这套搭配用于「%s」,请优先围绕该场景挑选单品,并在 scene 字段回填该场景。\n", s)
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}
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correctionSection := ""
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if h := strings.TrimSpace(retryHint); h != "" {
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correctionSection = fmt.Sprintf("\n## 上次输出问题(本次必须修正)\n%s\n", h)
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}
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return fmt.Sprintf(`你是一位专业的时尚搭配师。请根据用户今天的星座运势和衣橱中的衣物,为用户推荐一套今日穿搭。
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## 用户信息
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- 星座:%s
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- 今日综合运势:%d 星(满分 5 星)
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- 今日爱情运势:%d 星
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- 今日工作运势:%d 星
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- 今日财富运势:%d 星
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- 今日运势描述:%s
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## 用户衣橱
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%s
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%s
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## 搭配规则
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1. 所有推荐单品必须严格选自用户衣橱,clothes_id 与 clothes_uuid 必须与衣橱中存在的衣物一一对应,不得虚构
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2. 先识别衣橱中包含的有效品类,仅统计以下 6 类:上装、下装、连衣裙、外套、鞋、配饰:
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- 每个存在的品类最多推荐 1 件最合适的单品
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- 衣橱中没有的品类,不在结果中输出,无需强制凑满 6 件
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3. 完整性要求(判定依据为衣橱实际存在的品类,必须满足,否则视为无效输出):
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- 必须包含「上装」或「连衣裙」二者之一(衣橱存在其中任一时)——不能只推荐外套或只推荐下装
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- 选择「外套」时必须同时搭配「上装」或「连衣裙」(外套是外层,不可孤立出现)
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- 选择「连衣裙」时不再搭配「下装」(二者互斥)
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- 未选择「连衣裙」且衣橱存在「下装」时,必须包含「下装」
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- 衣橱存在「鞋」时必须包含「鞋」;「配饰」为可选点缀
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4. 结合今日运势调整风格:运势评分高可选择出彩、有设计感的搭配;运势一般则选择稳重、舒适的基础款搭配
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5. 参考衣服的版型(version)、面料材质(material)、图案纹理(pattern)、颜色(主色/副色)、袖型、衣长等进行搭配,确保搭配和谐
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6. 保证所选单品之间颜色、风格协调统一
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7. 为每件推荐单品撰写一句简洁的推荐理由
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8. 为整套穿搭拟定一个贴合风格与运势的好听标题
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%s
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## 输出要求
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必须严格按以下 JSON 结构输出,不要输出任何多余文字、解释或代码围栏:
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{
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"outfit_name": "穿搭标题",
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"description": "结合今日运势的整体搭配说明",
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"style": "穿搭风格,如:简约/复古/街头/甜美等",
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"scene": "适合场景,如:通勤/约会/休闲/运动等",
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"items": [
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{"type": "上装", "clothes_id": 1, "clothes_uuid": "衣橱中该衣物对应的UUID", "reason": "单品推荐理由"}
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]
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}
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补充约束:
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- type 字段取值仅限「上装」「下装」「连衣裙」「外套」「鞋」「配饰」,与衣橱实际品类一一对应
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- style 表示穿搭风格(如简约/复古/街头/甜美),scene 表示适合场景(如通勤/约会/休闲/运动),两者含义不同,必须分别输出
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- items 数组长度由衣橱中存在的品类数量决定,不存在的品类不写入数组;且必须满足上述「完整性要求」
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- clothes_id 必须为整数,且必须是衣橱中真实存在的 ID
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- clothes_uuid 必须从「用户衣橱」信息中精确复制,且与 clothes_id 一一对应,严禁编造或改动 UUID`,
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zodiac, fortune.Overall, fortune.Love, fortune.Work, fortune.Money, fortune.Description, clothesText, sceneSection, correctionSection)
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}
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// buildRecommendSchema 构造 JSON Schema 要求大模型结构化输出。
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func buildRecommendSchema() map[string]interface{} {
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return map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"outfit_name": map[string]interface{}{
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"type": "string",
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"description": "穿搭标题",
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},
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"description": map[string]interface{}{
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"type": "string",
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"description": "穿搭整体描述,结合运势说明搭配理由",
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},
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"style": map[string]interface{}{
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"type": "string",
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"description": "穿搭风格,如:简约、复古、街头、甜美等",
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},
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"scene": map[string]interface{}{
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"type": "string",
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"description": "适合场景,如:通勤、约会、休闲、运动等",
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},
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"items": map[string]interface{}{
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"type": "array",
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"description": "推荐的单品列表,每个存在的品类最多一件,不存在的品类不输出",
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"items": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"type": map[string]interface{}{
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"type": "string",
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"description": "品类,必须是以下之一:上装、下装、连衣裙、外套、鞋、配饰",
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"enum": outfitCategories,
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},
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"clothes_id": map[string]interface{}{
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"type": "integer",
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"description": "衣橱中衣物的 ID",
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},
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"clothes_uuid": map[string]interface{}{
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"type": "string",
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"description": "衣橱中衣物的 UUID,必须与 clothes_id 对应",
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},
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"reason": map[string]interface{}{
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"type": "string",
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"description": "推荐理由,一句话说明为什么选这件",
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},
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},
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"required": []string{"type", "clothes_id", "clothes_uuid", "reason"},
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},
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},
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},
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"required": []string{"outfit_name", "description", "style", "scene", "items"},
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}
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}
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// ValidateClothesIDs 校验并纠偏大模型返回的推荐结果:
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// 1. 过滤 clothes_id 不在用户衣橱中的项;
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// 2. 将 type 规范化为衣物实际的大类(CategoryMain);
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// 3. 以衣橱实际数据回填正确的 ClothesUUID(防止模型抄错 UUID);
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// 4. 对重复的 clothes_id 去重(保留首次出现)。
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func (r *RecommendLLMResponse) ValidateClothesIDs(clothes []mysqlmodel.Clothes) {
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clothesByID := make(map[int64]mysqlmodel.Clothes, len(clothes))
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for _, c := range clothes {
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clothesByID[c.ID] = c
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}
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filtered := make([]RecommendLLMItem, 0, len(r.Items))
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seen := make(map[int64]struct{}, len(r.Items))
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for _, item := range r.Items {
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c, ok := clothesByID[item.ClothesID]
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if !ok {
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continue
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}
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if _, dup := seen[item.ClothesID]; dup {
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continue
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}
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// 以衣橱中实际数据为准,纠偏模型可能返回的 type 与 UUID。
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item.Type = c.CategoryMain
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item.ClothesUUID = c.ClothesUUID
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seen[item.ClothesID] = struct{}{}
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filtered = append(filtered, item)
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}
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r.Items = filtered
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}
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// GetClothesIDs 获取推荐中所有不重复的 clothes ID。
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func (r *RecommendLLMResponse) GetClothesIDs() []int64 {
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ids := make([]int64, 0, len(r.Items))
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seen := make(map[int64]struct{}, len(r.Items))
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for _, item := range r.Items {
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if _, ok := seen[item.ClothesID]; ok {
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continue
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}
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seen[item.ClothesID] = struct{}{}
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ids = append(ids, item.ClothesID)
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}
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return ids
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}
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// ---- 搭配完整性保障 ----
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// CorrectionHintStrictSelection 首次输出没有任何有效单品时的纠偏提示(要求严格从衣橱选品)。
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const CorrectionHintStrictSelection = "上一次输出没有任何有效单品。请严格从「用户衣橱」中选择衣物," +
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"clothes_id 与 clothes_uuid 必须与衣橱中真实存在的衣物完全一致,不得虚构或使用未列出的衣物。"
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// BuildCorrectionHint 生成重试时的纠偏提示:仅由固定品类枚举拼装(不含任何用户输入);无问题时返回空串。
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func BuildCorrectionHint(missing, conflicts []string) string {
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if len(missing) == 0 && len(conflicts) == 0 {
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return ""
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}
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var sb strings.Builder
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sb.WriteString("上一次输出不符合搭配完整性规则,本次必须修正:")
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if len(missing) > 0 {
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sb.WriteString("\n- 必须补充以下品类(每类 1 件,且必须选自用户衣橱):" + strings.Join(missing, "、"))
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}
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if len(conflicts) > 0 {
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sb.WriteString("\n- 以下品类与已选单品冲突,必须移除:" + strings.Join(conflicts, "、"))
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}
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sb.WriteString("\n- 其余单品可沿用上一次的选择,但必须同时满足「## 搭配规则」的全部要求。")
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return sb.String()
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}
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// NormalizeCategories 同一品类最多保留 1 件(保留首次出现),返回被移除的品类。
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// 与提示词「每个存在的品类最多推荐 1 件」保持一致,避免模型重复给出同类单品造成搭配冗余。
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func (r *RecommendLLMResponse) NormalizeCategories() (removed []string) {
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seen := make(map[string]bool, len(r.Items))
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kept := make([]RecommendLLMItem, 0, len(r.Items))
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for _, item := range r.Items {
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if item.Type != "" {
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if seen[item.Type] {
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removed = append(removed, item.Type)
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continue
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}
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seen[item.Type] = true
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}
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kept = append(kept, item)
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}
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r.Items = kept
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return removed
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}
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// CompletenessIssues 按衣橱实际存在的品类判定搭配完整性,返回缺失品类与冲突品类;两者皆空表示搭配完整。
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//
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// 规则(衣橱中不存在的品类不强制,避免要求补齐一个衣橱里根本没有的品类):
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// 1. 内层必选(含「外套不可孤立」):结果必须包含「上装」或「连衣裙」二者之一;选了外套同样如此,
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// 因为外套是外层、无法单独构成一套穿搭;
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// 2. 下装:结果未选「连衣裙」且衣橱存在「下装」时,必须包含「下装」;
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// 3. 鞋:衣橱存在「鞋」时必须包含「鞋」;「配饰」为可选点缀,不做要求;
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// 4. 冲突:结果同时包含「连衣裙」与「下装」(二者互斥)。
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//
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// 调用前需先执行 ValidateClothesIDs,保证 item.Type 为衣橱实际大类。
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func (r *RecommendLLMResponse) CompletenessIssues(clothes []mysqlmodel.Clothes) (missing []string, conflicts []string) {
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wardrobe := wardrobeCategories(clothes)
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picked := r.pickedCategories()
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hasDress := picked[categoryDress]
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if hasInner := picked[categoryTop] || hasDress; !hasInner &&
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(picked[categoryCoat] || wardrobe[categoryTop] || wardrobe[categoryDress]) {
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// 优先补「上装」,衣橱没有上装时补「连衣裙」;两者都没有则无法补齐,不做要求。
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switch {
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case wardrobe[categoryTop]:
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missing = append(missing, categoryTop)
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case wardrobe[categoryDress]:
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missing = append(missing, categoryDress)
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}
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}
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if !hasDress && wardrobe[categoryBottom] && !picked[categoryBottom] {
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missing = append(missing, categoryBottom)
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}
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if wardrobe[categoryShoes] && !picked[categoryShoes] {
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missing = append(missing, categoryShoes)
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}
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if hasDress && picked[categoryBottom] {
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conflicts = append(conflicts, categoryBottom)
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}
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return missing, conflicts
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}
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// ApplyAutoComplete 确定性补齐缺失品类并剔除冲突项,返回新增与移除的品类。
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// 补齐顺序与 CompletenessIssues 的缺失顺序一致(内层 → 下装 → 鞋);候选单品按固定优先级排序,保证同输入同输出。
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func (r *RecommendLLMResponse) ApplyAutoComplete(clothes []mysqlmodel.Clothes) (added []string, removed []string) {
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removed = append(removed, r.removeConflicts()...)
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pref := r.completionPref(clothes)
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// 循环上限取品类总数(补齐最多 3 件),防御异常输入导致死循环。
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for round := 0; round < len(outfitCategories); round++ {
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missing, conflicts := r.CompletenessIssues(clothes)
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if len(conflicts) > 0 {
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removed = append(removed, r.removeConflicts()...)
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continue
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}
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if len(missing) == 0 {
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break
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}
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item, ok := r.pickCompletionItem(clothes, missing[0], pref)
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if !ok {
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break // 衣橱中该品类没有可用单品:无法补齐,保留现状。
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}
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r.Items = append(r.Items, *item)
|
||
added = append(added, missing[0])
|
||
}
|
||
return added, removed
|
||
}
|
||
|
||
// completionPreference 补齐偏好:已选单品的风格 / 主色 / 视觉冲击力众数(空串表示无偏好)。
|
||
type completionPreference struct {
|
||
style string
|
||
color string
|
||
visualImpact string
|
||
}
|
||
|
||
// completionPref 汇总已选单品对应衣物的风格/主色/视觉冲击力众数,用于挑选最协调的补齐单品。
|
||
func (r *RecommendLLMResponse) completionPref(clothes []mysqlmodel.Clothes) completionPreference {
|
||
clothesByID := make(map[int64]mysqlmodel.Clothes, len(clothes))
|
||
for _, c := range clothes {
|
||
clothesByID[c.ID] = c
|
||
}
|
||
styles := make([]string, 0, len(r.Items))
|
||
colors := make([]string, 0, len(r.Items))
|
||
impacts := make([]string, 0, len(r.Items))
|
||
for _, item := range r.Items {
|
||
c, ok := clothesByID[item.ClothesID]
|
||
if !ok {
|
||
continue
|
||
}
|
||
styles = append(styles, c.Style)
|
||
colors = append(colors, c.ColorMain)
|
||
impacts = append(impacts, c.VisualImpact)
|
||
}
|
||
return completionPreference{
|
||
style: mostFrequent(styles),
|
||
color: mostFrequent(colors),
|
||
visualImpact: mostFrequent(impacts),
|
||
}
|
||
}
|
||
|
||
// pickCompletionItem 为指定品类挑选补齐单品:排除已在结果中的衣物,按
|
||
// 「同风格 → 主色一致 → 视觉冲击力一致 → ID 最新」的确定性优先级取第一件。
|
||
func (r *RecommendLLMResponse) pickCompletionItem(clothes []mysqlmodel.Clothes, category string, pref completionPreference) (*RecommendLLMItem, bool) {
|
||
picked := make(map[int64]bool, len(r.Items))
|
||
for _, item := range r.Items {
|
||
picked[item.ClothesID] = true
|
||
}
|
||
var best *mysqlmodel.Clothes
|
||
for i := range clothes {
|
||
c := &clothes[i]
|
||
if c.CategoryMain != category || picked[c.ID] {
|
||
continue
|
||
}
|
||
if best == nil || completionBetter(c, best, pref) {
|
||
best = c
|
||
}
|
||
}
|
||
if best == nil {
|
||
return nil, false
|
||
}
|
||
return &RecommendLLMItem{
|
||
Type: best.CategoryMain,
|
||
ClothesID: best.ID,
|
||
ClothesUUID: best.ClothesUUID,
|
||
Reason: "系统按搭配完整性规则补齐(原推荐缺少" + category + ")",
|
||
}, true
|
||
}
|
||
|
||
// completionBetter 报告 a 是否应优先于 b(确定性排序键,保证同输入同输出)。
|
||
func completionBetter(a, b *mysqlmodel.Clothes, pref completionPreference) bool {
|
||
if hitA, hitB := prefMatch(a.Style, pref.style), prefMatch(b.Style, pref.style); hitA != hitB {
|
||
return hitA
|
||
}
|
||
if hitA, hitB := prefMatch(a.ColorMain, pref.color), prefMatch(b.ColorMain, pref.color); hitA != hitB {
|
||
return hitA
|
||
}
|
||
if hitA, hitB := prefMatch(a.VisualImpact, pref.visualImpact), prefMatch(b.VisualImpact, pref.visualImpact); hitA != hitB {
|
||
return hitA
|
||
}
|
||
return a.ID > b.ID // 同一优先级时取最近上传的一件,保证结果稳定可复现。
|
||
}
|
||
|
||
// prefMatch 判断候选值是否命中偏好值(偏好为空视为不命中,避免空值互相“匹配”造成排序漂移)。
|
||
func prefMatch(value, preference string) bool {
|
||
return preference != "" && value == preference
|
||
}
|
||
|
||
// removeConflicts 剔除与「连衣裙」互斥的「下装」,返回被移除的品类。
|
||
func (r *RecommendLLMResponse) removeConflicts() (removed []string) {
|
||
picked := r.pickedCategories()
|
||
if !picked[categoryDress] || !picked[categoryBottom] {
|
||
return nil
|
||
}
|
||
kept := make([]RecommendLLMItem, 0, len(r.Items))
|
||
for _, item := range r.Items {
|
||
if item.Type == categoryBottom {
|
||
removed = append(removed, item.Type)
|
||
continue
|
||
}
|
||
kept = append(kept, item)
|
||
}
|
||
r.Items = kept
|
||
return removed
|
||
}
|
||
|
||
// pickedCategories 返回推荐结果覆盖的品类集合。
|
||
func (r *RecommendLLMResponse) pickedCategories() map[string]bool {
|
||
picked := make(map[string]bool, len(r.Items))
|
||
for _, item := range r.Items {
|
||
picked[item.Type] = true
|
||
}
|
||
return picked
|
||
}
|
||
|
||
// wardrobeCategories 统计衣橱中实际存在的大类(仅 6 类有意义,其它取值不影响规则判定)。
|
||
func wardrobeCategories(clothes []mysqlmodel.Clothes) map[string]bool {
|
||
wardrobe := make(map[string]bool, len(outfitCategories))
|
||
for _, c := range clothes {
|
||
wardrobe[c.CategoryMain] = true
|
||
}
|
||
return wardrobe
|
||
}
|
||
|
||
// mostFrequent 返回非空值中出现次数最多的值(并列时取先出现者);全为空时返回空串。
|
||
func mostFrequent(values []string) string {
|
||
counts := make(map[string]int, len(values))
|
||
best, bestCount := "", 0
|
||
for _, v := range values {
|
||
if v == "" {
|
||
continue
|
||
}
|
||
counts[v]++
|
||
if counts[v] > bestCount {
|
||
best, bestCount = v, counts[v]
|
||
}
|
||
}
|
||
return best
|
||
}
|
||
|
||
// FormatClothesInfo 将衣橱衣物列表转换为传给 LLM 的摘要格式。
|
||
// 使用「字段名:值」标注,补全穿搭相关字段,便于模型准确理解每个属性。
|
||
// 所有字符串字段经 sanitizePromptField 清洗,降低 prompt 注入风险。
|
||
func FormatClothesInfo(clothesList []mysqlmodel.Clothes) string {
|
||
var sb strings.Builder
|
||
for _, c := range clothesList {
|
||
sb.WriteString(fmt.Sprintf(
|
||
"- ID:%d | UUID:%s | 大类:%s | 小类:%s | 名称:%s | 主色:%s | 副色:%s | 风格:%s | 版型:%s | 材质:%s | 花纹:%s | 厚度:%s | 袖型:%s | 衣长:%s | 领型:%s | 正式度:%s | 场合:%s | 视觉冲击力:%s\n",
|
||
c.ID,
|
||
sanitizePromptField(c.ClothesUUID), sanitizePromptField(c.CategoryMain), sanitizePromptField(c.CategorySub),
|
||
sanitizePromptField(c.Name), sanitizePromptField(c.ColorMain), sanitizePromptField(c.ColorSub),
|
||
sanitizePromptField(c.Style), sanitizePromptField(c.Version), sanitizePromptField(c.Material),
|
||
sanitizePromptField(c.Pattern), sanitizePromptField(c.Thickness), sanitizePromptField(c.SleeveType),
|
||
sanitizePromptField(c.ClothesType), sanitizePromptField(c.NecklineType), sanitizePromptField(c.Formality),
|
||
sanitizePromptField(c.Occasions), sanitizePromptField(c.VisualImpact)))
|
||
}
|
||
return sb.String()
|
||
}
|
||
|
||
// sanitizePromptField 清洗拼入 prompt 的用户可控字段:
|
||
// 截断长度、移除换行与控制字符、压缩连续空白,降低 prompt 注入风险。
|
||
func sanitizePromptField(s string) string {
|
||
const maxLen = 200
|
||
if s == "" {
|
||
return ""
|
||
}
|
||
|
||
var b strings.Builder
|
||
for _, r := range s {
|
||
switch {
|
||
case r == '\n' || r == '\r' || r == '\t':
|
||
b.WriteRune(' ') // 换行/制表符压缩为空格,防止注入换行指令。
|
||
case r < 0x20 || r == 0x7F:
|
||
continue // 丢弃其它控制字符。
|
||
default:
|
||
b.WriteRune(r)
|
||
}
|
||
}
|
||
|
||
// 压缩连续空白。
|
||
out := strings.Join(strings.Fields(b.String()), " ")
|
||
runes := []rune(out)
|
||
if len(runes) > maxLen {
|
||
out = string(runes[:maxLen])
|
||
}
|
||
return out
|
||
}
|