import { ChatService } from '../../ChatService';
import { Message, MessageWithVision } from '../../../../types';
/**
 * Gemini implementation of ChatService
 */
export declare class GeminiChatService implements ChatService {
    private apiKey;
    private model;
    private visionModel;
    /** Provider name */
    readonly provider: string;
    /**
     * Constructor
     * @param apiKey Google API key
     * @param model Name of the model to use
     * @param visionModel Name of the vision model
     */
    constructor(apiKey: string, model?: string, visionModel?: string);
    /**
     * Get the current model name
     * @returns Model name
     */
    getModel(): string;
    /**
     * Get the current vision model name
     * @returns Vision model name
     */
    getVisionModel(): string;
    /**
     * Process chat messages
     * @param messages Array of messages to send
     * @param onPartialResponse Callback to receive each part of streaming response
     * @param onCompleteResponse Callback to execute when response is complete
     */
    processChat(messages: Message[], onPartialResponse: (text: string) => void, onCompleteResponse: (text: string) => Promise<void>): Promise<void>;
    /**
     * Process chat messages with images
     * @param messages Array of messages to send (including images)
     * @param onPartialResponse Callback to receive each part of streaming response
     * @param onCompleteResponse Callback to execute when response is complete
     * @throws Error if the selected model doesn't support vision
     */
    processVisionChat(messages: MessageWithVision[], onPartialResponse: (text: string) => void, onCompleteResponse: (text: string) => Promise<void>): Promise<void>;
    /**
     * Convert AITuber OnAir messages to Gemini format
     * @param messages Array of messages
     * @returns Gemini formatted messages
     */
    private convertMessagesToGeminiFormat;
    /**
     * Convert AITuber OnAir vision messages to Gemini format
     * @param messages Array of vision messages
     * @returns Gemini formatted vision messages
     */
    private convertVisionMessagesToGeminiFormat;
    /**
     * Convert Blob to Base64 string
     * @param blob Image blob
     * @returns Promise with base64 encoded string
     */
    private blobToBase64;
    /**
     * Map AITuber OnAir roles to Gemini roles
     * @param role AITuber OnAir role
     * @returns Gemini role
     */
    private mapRoleToGemini;
}