From 58f5dd48d9c64782e25d49f234e7076d39b0bd12 Mon Sep 17 00:00:00 2001
From: Achim Rohn <achim@rohn.eu>
Date: Fri, 9 Jan 2026 17:39:52 +0100
Subject: [PATCH] Add embedding support to Mistral client and mock

---
 llm/mistral.go | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/llm/mistral.go b/llm/mistral.go
index 737f83e..b30bbb9 100644
--- a/llm/mistral.go
+++ b/llm/mistral.go
@@ -91,6 +91,35 @@ type UsageInfo struct {
 	TotalTokens      int `json:"total_tokens"`
 }
 
+// EmbeddingRequest represents the request body for embeddings
+type EmbeddingRequest struct {
+	Model          string   `json:"model"`
+	Input          []string `json:"input"`
+	EncodingFormat string   `json:"encoding_format,omitempty"`
+}
+
+// EmbeddingResponse represents the API response for embeddings
+type EmbeddingResponse struct {
+	ID     string             `json:"id"`
+	Object string             `json:"object"`
+	Data   []EmbeddingData    `json:"data"`
+	Model  string             `json:"model"`
+	Usage  EmbeddingUsageInfo `json:"usage"`
+}
+
+// EmbeddingData represents a single embedding result
+type EmbeddingData struct {
+	Object    string    `json:"object"`
+	Embedding []float64 `json:"embedding"`
+	Index     int       `json:"index"`
+}
+
+// EmbeddingUsageInfo represents token usage information for embeddings
+type EmbeddingUsageInfo struct {
+	PromptTokens int `json:"prompt_tokens"`
+	TotalTokens  int `json:"total_tokens"`
+}
+
 // Client represents a Mistral API client
 type MistralClientImpl struct {
 	APIKey     string
@@ -145,8 +174,47 @@ func (c *MistralClientImpl) CreateChatCompletion(req *ChatCompletionRequest) (*C
 	return &result, nil
 }
 
+// CreateEmbedding sends an embedding request to the API
+func (c *MistralClientImpl) CreateEmbedding(req *EmbeddingRequest) (*EmbeddingResponse, error) {
+	jsonData, err := json.Marshal(req)
+	if err != nil {
+		return nil, fmt.Errorf("error marshaling request: %v", err)
+	}
+
+	request, err := http.NewRequest("POST", c.BaseURL+"/v1/embeddings", bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("error creating request: %v", err)
+	}
+
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Authorization", "Bearer "+c.APIKey)
+
+	response, err := c.HTTPClient.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("error making request: %v", err)
+	}
+	defer response.Body.Close()
+
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("error reading response body: %v", err)
+	}
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API request failed with status %d: %s", response.StatusCode, string(body))
+	}
+
+	var result EmbeddingResponse
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("error unmarshaling response: %v", err)
+	}
+
+	return &result, nil
+}
+
 type MistralClient interface {
 	CreateChatCompletion(req *ChatCompletionRequest) (*ChatCompletionResponse, error)
+	CreateEmbedding(req *EmbeddingRequest) (*EmbeddingResponse, error)
 }
 
 type MistralClientMock struct {
@@ -170,3 +238,27 @@ func (m MistralClientMock) CreateChatCompletion(req *ChatCompletionRequest) (*Ch
 	return &response, nil
 	//return nil, errors.New("something went wrong")
 }
+
+func (m MistralClientMock) CreateEmbedding(req *EmbeddingRequest) (*EmbeddingResponse, error) {
+	ersteller.Debug("mocking the mistral client embedding")
+	// Return mock embeddings with dummy values
+	data := make([]EmbeddingData, len(req.Input))
+	for i := range req.Input {
+		data[i] = EmbeddingData{
+			Object:    "embedding",
+			Embedding: make([]float64, 1024), // Mistral embedding models typically use 1024 dimensions
+			Index:     i,
+		}
+	}
+	response := EmbeddingResponse{
+		ID:     "mock-embedding-id",
+		Object: "list",
+		Data:   data,
+		Model:  req.Model,
+		Usage: EmbeddingUsageInfo{
+			PromptTokens: len(req.Input) * 10,
+			TotalTokens:  len(req.Input) * 10,
+		},
+	}
+	return &response, nil
+}