From a574e5290261f9ea2cc39fd0a9a2ba756fc1f67a Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Wed, 1 Apr 2026 12:51:04 +0300
Subject: z4: anchor genai dependency

---
 internal/image/nanobanana.go      | 32 ++++++++++++++++++++++++++++++++
 internal/image/nanobanana_test.go | 26 ++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 internal/image/nanobanana.go
 create mode 100644 internal/image/nanobanana_test.go

(limited to 'internal')

diff --git a/internal/image/nanobanana.go b/internal/image/nanobanana.go
new file mode 100644
index 0000000..f65833f
--- /dev/null
+++ b/internal/image/nanobanana.go
@@ -0,0 +1,32 @@
+package image
+
+import "google.golang.org/genai"
+
+const (
+	// DefaultNanoBananaModel is the model name planned for Nano Banana image generation.
+	DefaultNanoBananaModel = "gemini-3.1-flash-image-preview"
+
+	// DefaultNanoBananaTextModel is the text model planned for prompt and translation work.
+	DefaultNanoBananaTextModel = "gemini-2.5-flash"
+)
+
+// NanoBananaConfig holds the settings needed to build a Gemini-backed image generator.
+type NanoBananaConfig struct {
+	APIKey    string
+	Model     string
+	TextModel string
+}
+
+// NewNanoBananaConfig returns a normalized Nano Banana configuration.
+func NewNanoBananaConfig(apiKey string) *NanoBananaConfig {
+	return &NanoBananaConfig{
+		APIKey:    apiKey,
+		Model:     DefaultNanoBananaModel,
+		TextModel: DefaultNanoBananaTextModel,
+	}
+}
+
+// ClientConfig returns the Google GenAI client config for this provider.
+func (c *NanoBananaConfig) ClientConfig() *genai.ClientConfig {
+	return &genai.ClientConfig{APIKey: c.APIKey}
+}
diff --git a/internal/image/nanobanana_test.go b/internal/image/nanobanana_test.go
new file mode 100644
index 0000000..bde91a1
--- /dev/null
+++ b/internal/image/nanobanana_test.go
@@ -0,0 +1,26 @@
+package image
+
+import "testing"
+
+func TestNewNanoBananaConfig(t *testing.T) {
+	t.Parallel()
+
+	cfg := NewNanoBananaConfig("test-key")
+	if cfg.APIKey != "test-key" {
+		t.Fatalf("expected API key to be preserved, got %q", cfg.APIKey)
+	}
+	if cfg.Model != DefaultNanoBananaModel {
+		t.Fatalf("expected default model %q, got %q", DefaultNanoBananaModel, cfg.Model)
+	}
+	if cfg.TextModel != DefaultNanoBananaTextModel {
+		t.Fatalf("expected default text model %q, got %q", DefaultNanoBananaTextModel, cfg.TextModel)
+	}
+
+	clientCfg := cfg.ClientConfig()
+	if clientCfg == nil {
+		t.Fatal("expected client config")
+	}
+	if clientCfg.APIKey != "test-key" {
+		t.Fatalf("expected client config API key to be preserved, got %q", clientCfg.APIKey)
+	}
+}
-- 
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