100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
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package threadspost
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import (
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"fmt"
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"strings"
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)
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// Threads Graph API text post hard limit (main post body).
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const MaxPublishRunes = 500
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// Threads reply/comment limit (outreach, not main post).
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const MaxReplyRunes = 1000
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// ViralSweetMin/Max: engagement sweet spot on Threads feed (Buffer / creator data, 2024–2026).
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const ViralSweetMin = 80
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const ViralSweetMax = 220
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// ViralSoftWarn: engagement tends to drop beyond this length in the main visible post.
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const ViralSoftWarn = 300
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type LengthBand string
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const (
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BandEmpty LengthBand = "empty"
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BandTooShort LengthBand = "too_short"
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BandSweet LengthBand = "sweet"
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BandLong LengthBand = "long"
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BandOverSoft LengthBand = "over_soft"
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BandOverHard LengthBand = "over_hard"
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)
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func RuneLen(text string) int {
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return len([]rune(strings.TrimSpace(text)))
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}
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func ClampPublish(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) > MaxPublishRunes {
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return string(runes[:MaxPublishRunes])
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}
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return text
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}
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func PublishBand(text string) LengthBand {
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n := RuneLen(text)
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switch {
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case n == 0:
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return BandEmpty
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case n < ViralSweetMin:
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return BandTooShort
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case n <= ViralSweetMax:
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return BandSweet
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case n <= ViralSoftWarn:
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return BandLong
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case n <= MaxPublishRunes:
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return BandOverSoft
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default:
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return BandOverHard
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}
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}
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func ValidatePublish(text string) error {
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if strings.TrimSpace(text) == "" {
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return fmt.Errorf("貼文內文不可為空")
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}
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n := RuneLen(text)
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if n > MaxPublishRunes {
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return fmt.Errorf("貼文超過 Threads 上限 %d 字（目前 %d 字）", MaxPublishRunes, n)
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}
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return nil
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}
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func ValidateReply(text string) error {
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if strings.TrimSpace(text) == "" {
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return fmt.Errorf("留言內文不可為空")
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}
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n := RuneLen(text)
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if n > MaxReplyRunes {
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return fmt.Errorf("留言超過 Threads 上限 %d 字（目前 %d 字）", MaxReplyRunes, n)
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}
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return nil
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}
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func PublishHint(text string) string {
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switch PublishBand(text) {
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case BandTooShort:
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return fmt.Sprintf("偏短（爆款常見 %d～%d 字）", ViralSweetMin, ViralSweetMax)
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case BandSweet:
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return fmt.Sprintf("長度適中（爆款常見 %d～%d 字）", ViralSweetMin, ViralSweetMax)
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case BandLong:
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return fmt.Sprintf("略長（超過 %d 字互動可能下降）", ViralSoftWarn)
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case BandOverSoft:
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return fmt.Sprintf("接近 Threads 主文上限 %d 字", MaxPublishRunes)
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case BandOverHard:
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return fmt.Sprintf("超過 Threads 上限 %d 字，請縮短", MaxPublishRunes)
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default:
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return ""
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}
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}
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