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package comic
import (
"strings"
)
const maxPromptSlugLength = 48
// slugify converts a comic title into a safe file-name component.
func slugify(title string) string {
title = strings.ToLower(strings.TrimSpace(title))
var b strings.Builder
prevHyphen := false
for _, r := range title {
switch {
case r >= 'a' && r <= 'z', r >= '0' && r <= '9':
b.WriteRune(r)
prevHyphen = false
case r == ' ' || r == '-' || r == '_':
if !prevHyphen && b.Len() > 0 {
b.WriteByte('-')
prevHyphen = true
}
}
}
slug := strings.TrimRight(b.String(), "-")
if slug == "" {
return "comic"
}
return slug
}
func shortSlug(title, fallback string) string {
slug := slugify(title)
if slug == "comic" {
slug = fallback
}
if slug == "" {
slug = fallback
}
if len(slug) <= maxPromptSlugLength {
return slug
}
cut := strings.LastIndex(slug[:maxPromptSlugLength+1], "-")
if cut < 12 {
cut = maxPromptSlugLength
}
slug = strings.TrimRight(slug[:cut], "-")
if slug == "" {
return fallback
}
return slug
}
func shortPromptSlugFromText(text string) string {
return shortSlug(text, "manual-prompt")
}
// splitIntoSections divides text into n sections, preferring paragraph boundaries.
func splitIntoSections(text string, n int) []string {
paragraphs := splitParagraphs(text)
if len(paragraphs) >= n {
return distributeParagraphs(paragraphs, n)
}
return splitByChars(text, n)
}
// splitParagraphs returns non-empty paragraphs separated by blank lines.
func splitParagraphs(text string) []string {
var out []string
for _, paragraph := range strings.Split(text, "\n\n") {
if paragraph = strings.TrimSpace(paragraph); paragraph != "" {
out = append(out, paragraph)
}
}
return out
}
func distributeParagraphs(paragraphs []string, n int) []string {
sections := make([]string, n)
size, rem, idx := len(paragraphs)/n, len(paragraphs)%n, 0
for i := range n {
count := size
if i < rem {
count++
}
sections[i] = strings.Join(paragraphs[idx:idx+count], "\n\n")
idx += count
}
return sections
}
func splitByChars(text string, n int) []string {
runes := []rune(text)
size := len(runes) / n
sections := make([]string, n)
for i := range n {
start := i * size
end := start + size
if i == n-1 {
end = len(runes)
}
sections[i] = strings.TrimSpace(string(runes[start:end]))
}
return sections
}
func orDefault(value, fallback string) string {
if strings.TrimSpace(value) != "" {
return value
}
return fallback
}
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