Added missing file

ai/llm_provider_openai_client.go

@@ -0,0 +1,56 @@
+// Package ai provides a flexible interface for interacting with various Language Learning Models (LLMs).
+package ai
+
+import (
+	"context"
+
+	"github.com/openai/openai-go"
+	"github.com/openai/openai-go/option"
+	"github.com/openai/openai-go/packages/ssestream"
+)
+
+// OpenAIClient defines the interface for interacting with OpenAI's API.
+// This interface abstracts the essential operations used by OpenAILLMProvider.
+type OpenAIClient interface {
+	// CreateCompletion creates a new chat completion using OpenAI's API.
+	CreateCompletion(ctx context.Context, params openai.ChatCompletionNewParams) (*openai.ChatCompletion, error)
+
+	// CreateStreamingCompletion creates a streaming chat completion using OpenAI's API.
+	CreateStreamingCompletion(ctx context.Context, params openai.ChatCompletionNewParams) *ssestream.Stream[openai.ChatCompletionChunk]
+}
+
+// RealOpenAIClient implements the OpenAIClient interface using OpenAI's official SDK.
+type RealOpenAIClient struct {
+	client *openai.Client
+}
+
+// NewRealOpenAIClient creates a new instance of RealOpenAIClient with the provided API key
+// and optional client options.
+//
+// Example usage:
+//
+//	// Basic usage with API key
+//	client := NewRealOpenAIClient("your-api-key")
+//
+//	// Usage with custom HTTP client
+//	httpClient := &http.Client{Timeout: 30 * time.Second}
+//	client := NewRealOpenAIClient(
+//	    "your-api-key",
+//	    option.WithHTTPClient(httpClient),
+//	)
+func NewRealOpenAIClient(apiKey string, opts ...option.RequestOption) *RealOpenAIClient {
+	opts = append(opts, option.WithAPIKey(apiKey))
+	return &RealOpenAIClient{
+		client: openai.NewClient(opts...),
+	}
+}
+
+// CreateCompletion implements the OpenAIClient interface using the real OpenAI client.
+func (c *RealOpenAIClient) CreateCompletion(ctx context.Context, params openai.ChatCompletionNewParams) (*openai.ChatCompletion, error) {
+	return c.client.Chat.Completions.New(ctx, params)
+}
+
+// CreateStreamingCompletion implements the streaming support for the OpenAIClient interface.
+func (c *RealOpenAIClient) CreateStreamingCompletion(ctx context.Context, params openai.ChatCompletionNewParams) *ssestream.Stream[openai.ChatCompletionChunk] {
+	return c.client.Chat.Completions.NewStreaming(ctx, params)
+}