121 lines
3.6 KiB
Go
121 lines
3.6 KiB
Go
package viral
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import (
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"encoding/json"
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"fmt"
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"regexp"
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"strings"
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"haixun-backend/internal/library/threadspost"
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)
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var codeFenceRE = regexp.MustCompile("(?s)```(?:json)?\\s*([\\s\\S]*?)```")
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type ReplicateInput struct {
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TopicLabel string
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TopicBrief string
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Persona string
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StyleProfile string
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OriginalText string
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AuthorName string
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StructureAnalysis string
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}
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type ReplicateResult struct {
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Angle string `json:"angle"`
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Hook string `json:"hook"`
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Text string `json:"text"`
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Rationale string `json:"rationale"`
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StructureNotes string `json:"structureNotes"`
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}
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func BuildSystemPrompt() string {
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return strings.TrimSpace(`你是 Threads 爆款複製策略師。根據參考爆文，為使用者撰寫「同結構、同節奏、但完全原創」的貼文。
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規則：
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- 複製的是爆款公式（hook 手法、情緒節奏），不是抄襲原文
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- 文筆必須像創作者本人，套用其 8D 風格策略
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- text 主文 ≤ 500 字（Threads API 硬上限，含 #話題標籤）
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- 爆款互動最佳 80～220 字：前 1～2 行強 hook，口語精簡；超過 300 字互動通常下降
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- 只回傳一個 JSON 物件，欄位：angle, hook, text, rationale, structureNotes`)
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}
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func BuildUserPrompt(input ReplicateInput) string {
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var b strings.Builder
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b.WriteString("主題：")
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b.WriteString(strings.TrimSpace(input.TopicLabel))
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b.WriteString("\n")
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if brief := strings.TrimSpace(input.TopicBrief); brief != "" {
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b.WriteString("Brief：")
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b.WriteString(brief)
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b.WriteString("\n")
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}
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if persona := strings.TrimSpace(input.Persona); persona != "" {
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b.WriteString("\n人設與語氣：\n")
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b.WriteString(persona)
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b.WriteString("\n")
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}
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if style := strings.TrimSpace(input.StyleProfile); style != "" {
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b.WriteString("\n8D 風格策略：\n")
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b.WriteString(style)
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b.WriteString("\n")
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}
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author := strings.TrimSpace(input.AuthorName)
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if author == "" {
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author = "匿名"
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}
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if analysis := strings.TrimSpace(input.StructureAnalysis); analysis != "" {
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b.WriteString("\n爆款結構分析（仿寫時套用）：\n")
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b.WriteString(analysis)
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b.WriteString("\n")
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}
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b.WriteString("\n原文參考（@")
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b.WriteString(author)
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b.WriteString("，只學結構不抄內容）：\n")
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b.WriteString(strings.TrimSpace(input.OriginalText))
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b.WriteString("\n\n請產出一篇可發布的複製版貼文 JSON。")
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return b.String()
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}
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func ParseReplicateOutput(raw string) (ReplicateResult, error) {
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payload, err := extractJSONObject(raw)
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if err != nil {
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return ReplicateResult{}, err
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}
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var out ReplicateResult
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if err := json.Unmarshal(payload, &out); err != nil {
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return ReplicateResult{}, fmt.Errorf("parse viral replica json: %w", err)
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}
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out.Text = trimText(out.Text)
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if out.Text == "" {
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return ReplicateResult{}, fmt.Errorf("replica text missing")
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}
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out.Angle = strings.TrimSpace(out.Angle)
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out.Hook = strings.TrimSpace(out.Hook)
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out.Rationale = strings.TrimSpace(out.Rationale)
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out.StructureNotes = strings.TrimSpace(out.StructureNotes)
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return out, nil
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}
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func trimText(text string) string {
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text = strings.TrimSpace(text)
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runes := []rune(text)
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if len(runes) > threadspost.MaxPublishRunes {
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return string(runes[:threadspost.MaxPublishRunes])
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}
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return text
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}
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func extractJSONObject(raw string) ([]byte, error) {
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raw = strings.TrimSpace(raw)
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if m := codeFenceRE.FindStringSubmatch(raw); len(m) == 2 {
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raw = strings.TrimSpace(m[1])
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}
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start := strings.Index(raw, "{")
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end := strings.LastIndex(raw, "}")
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if start < 0 || end <= start {
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return nil, fmt.Errorf("replica output missing json object")
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}
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return []byte(raw[start : end+1]), nil
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}
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