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package llm
import (
"context"
"errors"
"os"
"strings"
)
// Message represents a chat-style prompt message.
type Message struct {
Role string
Content string
}
// Client is a minimal LLM provider interface.
// Future providers (Ollama, etc.) should implement this.
type Client interface {
// Chat sends chat messages and returns the assistant text.
Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error)
// Name returns the provider's short name (e.g., "openai", "ollama").
Name() string
// DefaultModel returns the configured default model name.
DefaultModel() string
}
// Options for a request. Providers may ignore unsupported fields.
type Options struct {
Model string
Temperature float64
MaxTokens int
Stop []string
}
// RequestOption mutates Options.
type RequestOption func(*Options)
func WithModel(model string) RequestOption { return func(o *Options) { o.Model = model } }
func WithTemperature(t float64) RequestOption { return func(o *Options) { o.Temperature = t } }
func WithMaxTokens(n int) RequestOption { return func(o *Options) { o.MaxTokens = n } }
func WithStop(stop ...string) RequestOption {
return func(o *Options) { o.Stop = append([]string{}, stop...) }
}
// NewDefault returns the default provider using environment configuration.
// Selection order:
// 1) HEXAI_LLM_PROVIDER=openai|ollama
// 2) If OPENAI_API_KEY is set -> OpenAI
// 3) If any OLLAMA_* vars are set -> Ollama
func NewDefault() (Client, error) {
// Explicit provider selection
if p := strings.ToLower(strings.TrimSpace(os.Getenv("HEXAI_LLM_PROVIDER"))); p != "" {
switch p {
case "openai":
apiKey := os.Getenv("OPENAI_API_KEY")
if apiKey == "" {
return nil, errors.New("OPENAI_API_KEY is not set")
}
return newOpenAIFromEnv(apiKey), nil
case "ollama":
return newOllamaFromEnv(), nil
default:
return nil, errors.New("unknown HEXAI_LLM_PROVIDER: " + p)
}
}
// Auto-detect
if apiKey := os.Getenv("OPENAI_API_KEY"); apiKey != "" {
return newOpenAIFromEnv(apiKey), nil
}
if os.Getenv("OLLAMA_BASE_URL") != "" || os.Getenv("OLLAMA_HOST") != "" || os.Getenv("OLLAMA_MODEL") != "" {
return newOllamaFromEnv(), nil
}
return nil, errors.New("no LLM provider configured (set OPENAI_API_KEY or HEXAI_LLM_PROVIDER/OLLAMA_*)")
}
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