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package comic
import (
"context"
"errors"
"fmt"
"strings"
"codeberg.org/snonux/comicforge/internal/provider"
)
// GeneratorConfig configures story generation.
type GeneratorConfig struct {
TextProvider provider.TextProvider
Prompts PromptRenderer
Language string
Script string
Theme string
Genres []string
StoryPages int
PanelsPerPage int
}
// Generator produces the comic story text, bible, title, and panel script.
type Generator struct {
textProvider provider.TextProvider
prompts PromptRenderer
language string
script string
theme string
genres []string
storyPages int
panelsPerPage int
initErr error
}
var _ = (*Generator)(nil)
// NewGenerator creates a new story generator.
func NewGenerator(cfg *GeneratorConfig) *Generator {
g := &Generator{
language: "Bulgarian",
script: "Cyrillic",
genres: defaultStoryGenres,
storyPages: defaultStoryPagesInScript,
panelsPerPage: defaultStoryPanelsPerPage,
}
if cfg == nil {
g.initErr = errors.New("generator config is required")
return g
}
g.textProvider = cfg.TextProvider
g.prompts = cfg.Prompts
g.language = orDefault(cfg.Language, g.language)
g.script = orDefault(cfg.Script, g.script)
g.theme = cfg.Theme
if cfg.StoryPages > 0 {
g.storyPages = cfg.StoryPages
}
if cfg.PanelsPerPage > 0 {
g.panelsPerPage = cfg.PanelsPerPage
}
if len(cfg.Genres) > 0 {
g.genres = append([]string(nil), cfg.Genres...)
}
if g.textProvider == nil {
g.initErr = fmt.Errorf("%w: text provider", ErrMissingProvider)
}
if g.prompts == nil {
g.initErr = errors.Join(g.initErr, fmt.Errorf("%w: prompt renderer", ErrMissingProvider))
}
return g
}
// Generate produces only the story text.
func (g *Generator) Generate(ctx context.Context, entries []WordEntry) (string, error) {
if err := g.ready(); err != nil {
return "", err
}
prompt, err := g.renderStoryPrompt(storyPromptTemplate, entries)
if err != nil {
return "", err
}
ctx, cancel := withTimeout(ctx, storyTimeout)
defer cancel()
text, err := g.textProvider.GenerateText(ctx, prompt)
if err != nil {
return "", fmt.Errorf("generate story: %w", err)
}
text = strings.TrimSpace(text)
if text == "" {
return "", fmt.Errorf("no story content returned")
}
if err := validateTextScript("story text", text, g.script); err != nil {
return "", err
}
if err := validateNoPromptLeakage("story text", text); err != nil {
return "", err
}
return text, nil
}
// GenerateFull produces the combined story, bible, title, and panel script.
func (g *Generator) GenerateFull(ctx context.Context, entries []WordEntry) (GenerateResult, error) {
if err := g.ready(); err != nil {
return GenerateResult{}, err
}
prompt, err := g.renderStoryPrompt(storyFullPromptTemplate, entries)
if err != nil {
return GenerateResult{}, err
}
ctx, cancel := withTimeout(ctx, storyTimeout)
defer cancel()
text, err := g.textProvider.GenerateText(ctx, prompt)
if err != nil {
return GenerateResult{}, fmt.Errorf("generate story bundle: %w", err)
}
text = strings.TrimSpace(text)
if text == "" {
return GenerateResult{}, fmt.Errorf("no content returned")
}
result := parseGenerateResultWithDimensions(text, g.storyPages, g.panelsPerPage)
if err := validateGeneratedResult(result, g.script); err != nil {
return GenerateResult{}, err
}
return result, nil
}
func (g *Generator) ready() error {
if g == nil {
return errors.New("generator is nil")
}
if g.initErr != nil {
return g.initErr
}
return nil
}
func (g *Generator) renderStoryPrompt(templateName string, entries []WordEntry) (string, error) {
genre := resolveGenre(g.theme, g.genres)
data := map[string]any{
"Language": g.language,
"LanguageName": localizedLanguageName(g.language, g.script),
"Script": g.script,
"ScriptName": localizedScriptName(g.script),
"Genre": genre,
"Words": buildWordList(entries, ""),
"StoryPages": g.storyPages,
"PanelsPerPage": g.panelsPerPage,
"TotalPanels": g.storyPages * g.panelsPerPage,
"PanelLabelsText": panelLabelsText(g.panelsPerPage),
"RequiredDialoguePanels": requiredDialoguePanels(g.panelsPerPage),
"StoryBibleSeparator": storyBibleSeparator,
"StoryTitleSeparator": storyTitleSeparator,
"StoryPanelSeparator": storyPanelSeparator,
}
systemPrompt, err := g.prompts.RenderPrompt(storySystemPromptTemplate, map[string]any{
"Language": g.language,
"LanguageName": localizedLanguageName(g.language, g.script),
"Script": g.script,
"ScriptName": localizedScriptName(g.script),
})
if err != nil {
return "", err
}
userPrompt, err := g.prompts.RenderPrompt(templateName, data)
if err != nil {
return "", err
}
return systemPrompt + "\n\n" + userPrompt, nil
}
func validateGeneratedResult(result GenerateResult, script string) error {
if err := validateTextScript("story text", result.StoryText, script); err != nil {
return fmt.Errorf("%w (story=%q)", err, compactTextSnippet(result.StoryText))
}
if err := validateNoPromptLeakage("story text", result.StoryText); err != nil {
return fmt.Errorf("%w (story=%q)", err, compactTextSnippet(result.StoryText))
}
if err := validateTextScript("character bible", result.Bible, script); err != nil {
return fmt.Errorf("%w (bible=%q)", err, compactTextSnippet(result.Bible))
}
if err := validateNoPromptLeakage("character bible", result.Bible); err != nil {
return fmt.Errorf("%w (bible=%q)", err, compactTextSnippet(result.Bible))
}
if err := validateTextScript("comic title", result.Title, script); err != nil {
return fmt.Errorf("%w (title=%q)", err, compactTextSnippet(result.Title))
}
if err := validateNoPromptLeakage("comic title", result.Title); err != nil {
return fmt.Errorf("%w (title=%q)", err, compactTextSnippet(result.Title))
}
for pageIdx, page := range result.PanelScript {
for panelIdx, panel := range page {
label := fmt.Sprintf("panel script P%d-%s", pageIdx+1, panelLabel(panelIdx))
if err := validateTextScript(label, panel, script); err != nil {
return fmt.Errorf("%w (panel=%q)", err, compactTextSnippet(panel))
}
if err := validateNoPromptLeakage(label, panel); err != nil {
return fmt.Errorf("%w (panel=%q)", err, compactTextSnippet(panel))
}
}
}
return nil
}
func compactTextSnippet(text string) string {
text = strings.TrimSpace(text)
text = strings.Join(strings.Fields(text), " ")
if len(text) > 220 {
text = text[:220] + "..."
}
return text
}
|
