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|
package image
import (
"context"
"fmt"
"strings"
"google.golang.org/genai"
"codeberg.org/snonux/comicforge/internal/apicircuit"
)
func (c *GeminiProvider) generateText(ctx context.Context, model, systemPrompt, userPrompt string, temperature float32, maxOutputTokens int32) (string, error) {
temp := temperature
resp, err := apicircuit.Execute(nil, c.Name(), apicircuit.CapabilityText, func() (*genai.GenerateContentResponse, error) {
return c.client.Models.GenerateContent(ctx, model, []*genai.Content{
genai.NewContentFromText(userPrompt, genai.RoleUser),
}, &genai.GenerateContentConfig{
SystemInstruction: genai.NewContentFromText(systemPrompt, genai.RoleUser),
Temperature: &temp,
MaxOutputTokens: maxOutputTokens,
})
})
if err != nil {
return "", fmt.Errorf("gemini API error: %w", err)
}
text := strings.TrimSpace(resp.Text())
if text == "" {
return "", fmt.Errorf("no response received")
}
return text, nil
}
func geminiImageConfig(aspectRatio string) *genai.GenerateContentConfig {
if aspectRatio == "" {
aspectRatio = geminiAspectRatio
}
return &genai.GenerateContentConfig{
ResponseModalities: []string{string(genai.ModalityImage)},
ImageConfig: &genai.ImageConfig{
AspectRatio: aspectRatio,
},
}
}
func geminiReferenceParts(prompt string, refs [][]byte) []*genai.Part {
parts := make([]*genai.Part, 0, len(refs)+1)
for _, ref := range refs {
if len(ref) == 0 {
continue
}
parts = append(parts, &genai.Part{
InlineData: &genai.Blob{MIMEType: "image/png", Data: ref},
})
}
refNote := fmt.Sprintf(
"The %d reference image(s) above show the exact character appearance that must be preserved. "+
"Every character, animal, or object must look identical in the new image. Now generate:\n\n",
len(refs),
)
parts = append(parts, &genai.Part{Text: refNote + prompt})
return parts
}
func (c *GeminiProvider) generateImage(ctx context.Context, prompt, aspectRatio string) ([]byte, string, error) {
cfg := geminiImageConfig(aspectRatio)
resp, err := apicircuit.Execute(nil, c.Name(), apicircuit.CapabilityImage, func() (*genai.GenerateContentResponse, error) {
return c.client.Models.GenerateContent(ctx, c.modelName(), []*genai.Content{
genai.NewContentFromText(prompt, genai.RoleUser),
}, cfg)
})
if err != nil {
return nil, "", &SearchError{
Provider: geminiSource,
Code: "API_ERROR",
Message: fmt.Sprintf("failed to generate image: %v", err),
}
}
imageBytes, mimeType, err := extractGeneratedImage(resp)
if err != nil {
return nil, "", &SearchError{
Provider: geminiSource,
Code: "NO_RESULTS",
Message: err.Error(),
}
}
return imageBytes, mimeType, nil
}
func (c *GeminiProvider) generateImageWithRefs(ctx context.Context, prompt, aspectRatio string, refs [][]byte) ([]byte, string, error) {
cfg := geminiImageConfig(aspectRatio)
parts := geminiReferenceParts(prompt, refs)
resp, err := apicircuit.Execute(nil, c.Name(), apicircuit.CapabilityImage, func() (*genai.GenerateContentResponse, error) {
return c.client.Models.GenerateContent(ctx, c.modelName(), []*genai.Content{
{
Role: string(genai.RoleUser),
Parts: parts,
},
}, cfg)
})
if err != nil {
return nil, "", &SearchError{
Provider: geminiSource,
Code: "API_ERROR",
Message: fmt.Sprintf("failed to generate image with refs: %v", err),
}
}
imageBytes, mimeType, err := extractGeneratedImage(resp)
if err != nil {
return nil, "", &SearchError{
Provider: geminiSource,
Code: "NO_RESULTS",
Message: err.Error(),
}
}
return imageBytes, mimeType, nil
}
func extractGeneratedImage(response *genai.GenerateContentResponse) ([]byte, string, error) {
if response == nil {
return nil, "", fmt.Errorf("no response from Gemini")
}
for _, candidate := range response.Candidates {
if candidate == nil || candidate.Content == nil {
continue
}
for _, part := range candidate.Content.Parts {
if part == nil || part.InlineData == nil || len(part.InlineData.Data) == 0 {
continue
}
mimeType := part.InlineData.MIMEType
if mimeType == "" {
mimeType = "image/png"
}
return append([]byte(nil), part.InlineData.Data...), mimeType, nil
}
}
return nil, "", fmt.Errorf("no image data returned from Gemini")
}
|
