Function createChatInputFromParts

coderd/exp_chats.go:6214–6311

(
	ctx context.Context,
	db database.Store,
	parts []codersdk.ChatInputPart,
	fieldName string,
)

}

func createChatInputFromParts(
	ctx context.Context,
	db database.Store,
	parts []codersdk.ChatInputPart,
	fieldName string,
) ([]codersdk.ChatMessagePart, string, []uuid.UUID, *codersdk.Response) {
	if len(parts) == 0 {
		return nil, "", nil, &codersdk.Response{
			Message: "Content is required.",
			Detail:  "Content cannot be empty.",
		}
	}

	var fileIDs []uuid.UUID
	content := make([]codersdk.ChatMessagePart, 0, len(parts))
	textParts := make([]string, 0, len(parts))
	for i, part := range parts {
		switch strings.ToLower(strings.TrimSpace(string(part.Type))) {
		case string(codersdk.ChatInputPartTypeText):
			text := strings.TrimSpace(part.Text)
			if text == "" {
				return nil, "", nil, &codersdk.Response{
					Message: "Invalid input part.",
					Detail:  fmt.Sprintf("%s[%d].text cannot be empty.", fieldName, i),
				}
			}
			content = append(content, codersdk.ChatMessageText(text))
			textParts = append(textParts, text)
		case string(codersdk.ChatInputPartTypeFile):
			if part.FileID == uuid.Nil {
				return nil, "", nil, &codersdk.Response{
					Message: "Invalid input part.",
					Detail:  fmt.Sprintf("%s[%d].file_id is required for file parts.", fieldName, i),
				}
			}
			// Validate that the file exists and get its media type.
			// File data is not loaded here; it's resolved at LLM
			// dispatch time via chatFileResolver.
			chatFile, err := db.GetChatFileByID(ctx, part.FileID)
			if err != nil {
				if httpapi.Is404Error(err) {
					return nil, "", nil, &codersdk.Response{
						Message: "Invalid input part.",
						Detail:  fmt.Sprintf("%s[%d].file_id references a file that does not exist.", fieldName, i),
					}
				}
				return nil, "", nil, &codersdk.Response{
					Message: "Internal error.",
					Detail:  fmt.Sprintf("Failed to retrieve file for %s[%d].", fieldName, i),
				}
			}
			content = append(content, codersdk.ChatMessageFile(part.FileID, chatFile.Mimetype, chatFile.Name))
			fileIDs = append(fileIDs, part.FileID)
		// file-reference parts carry inline code snippets, not uploaded
		// files. They have no FileID and are excluded from file tracking.
		case string(codersdk.ChatInputPartTypeFileReference):
			if part.FileName == "" {
				return nil, "", nil, &codersdk.Response{