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// Summary: LLM provider interfaces, request options, configuration, and factory to build a client from config.
package llm
import (
"context"
"errors"
"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
}
// Streamer is an optional interface that providers may implement to support
// token-by-token streaming responses. Callers can type-assert to Streamer and
// fall back to Client.Chat when not implemented.
type Streamer interface {
// ChatStream sends chat messages and invokes onDelta with incremental text
// chunks as they are produced by the model. Implementations should call
// onDelta with empty strings sparingly (prefer only non-empty chunks).
ChatStream(ctx context.Context, messages []Message, onDelta func(string), opts ...RequestOption) error
}
// CodeCompleter is an optional interface for providers that support a
// prompt/suffix code-completion API (e.g., Copilot Codex endpoint). Clients
// can type-assert to this and prefer it over chat when available.
type CodeCompleter interface {
// CodeCompletion requests up to n suggestions given a left-hand prompt and
// right-hand suffix around the cursor. Language is advisory and may be
// ignored. Temperature applies when provider supports it.
CodeCompletion(ctx context.Context, prompt string, suffix string, n int, language string, temperature float64) ([]string, error)
}
// 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...) }
}
// Config defines provider configuration read from the Hexai config file.
type Config struct {
Provider string
// OpenAI options
OpenAIBaseURL string
OpenAIModel string
OpenAITemperature *float64
// Ollama options
OllamaBaseURL string
OllamaModel string
OllamaTemperature *float64
// Copilot options
CopilotBaseURL string
CopilotModel string
CopilotTemperature *float64
}
// NewFromConfig creates an LLM client using only the supplied configuration.
// The OpenAI API key is supplied separately and may be read from the environment
// by the caller; other environment-based configuration is not used.
func NewFromConfig(cfg Config, openAIAPIKey, copilotAPIKey string) (Client, error) {
p := strings.ToLower(strings.TrimSpace(cfg.Provider))
if p == "" {
p = "openai"
}
switch p {
case "openai":
if strings.TrimSpace(openAIAPIKey) == "" {
return nil, errors.New("missing OPENAI_API_KEY for provider openai")
}
// Set coding-friendly default temperature if none provided
if cfg.OpenAITemperature == nil {
t := 0.2
cfg.OpenAITemperature = &t
}
return newOpenAI(cfg.OpenAIBaseURL, cfg.OpenAIModel, openAIAPIKey, cfg.OpenAITemperature), nil
case "ollama":
if cfg.OllamaTemperature == nil {
t := 0.2
cfg.OllamaTemperature = &t
}
return newOllama(cfg.OllamaBaseURL, cfg.OllamaModel, cfg.OllamaTemperature), nil
case "copilot":
if strings.TrimSpace(copilotAPIKey) == "" {
return nil, errors.New("missing COPILOT_API_KEY for provider copilot")
}
if cfg.CopilotTemperature == nil {
t := 0.2
cfg.CopilotTemperature = &t
}
return newCopilot(cfg.CopilotBaseURL, cfg.CopilotModel, copilotAPIKey, cfg.CopilotTemperature), nil
default:
return nil, errors.New("unknown LLM provider: " + p)
}
}
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