package backend

import "os"

const (
	geminiBaseURL     = "https://generativelanguage.googleapis.com/v1beta/openai/"
	geminiDefaultModel = "gemini-2.5-flash-preview-05-20"
)

// NewGemini constructs an OpenAI-compatible backend pointed at Google AI Studio.
// apiKey is the Google AI Studio key (OLLIE_GEMINI_KEY).
// If model is empty the default model is used.
func NewGemini(apiKey string) (*OpenAIBackend, error) {
	b, err := NewOpenAI("gemini", geminiBaseURL, apiKey)
	if err != nil {
		return nil, err
	}
	b.model = geminiDefaultModel
	return b, nil
}

// geminiKey returns the API key from OLLIE_GEMINI_KEY, falling back to
// OLLIE_OPENAI_KEY so existing env files that set the generic key still work.
func geminiKey() string {
	if k := os.Getenv("OLLIE_GEMINI_KEY"); k != "" {
		return k
	}
	return os.Getenv("OLLIE_OPENAI_KEY")
}