import { DiscountType } from './models/ReferralCode';
import type { CreateCodeResponse, VerifyCodeResponse, IncrementUsageResponse } from './controllers/referralController';
export interface CoupanCodeSDKConfig {
    apiKey: string;
    clientId: string;
}
/**
 * Coupan Code SDK - Main entry point for using the package
 * Similar to AWS SDK pattern where you initialize with credentials
 */
export declare class CoupanCodeSDK {
    private apiKey;
    private clientId;
    private isInitialized;
    private validatedClientId?;
    constructor(config: CoupanCodeSDKConfig);
    /**
     * Initialize the SDK - validates API key and connects to database
     * Must be called before using any other methods
     * Uses optimized connection pooling and retry logic
     * @returns Promise that resolves when initialization is complete
     * @throws Error if API key is invalid or database connection fails
     */
    init(): Promise<void>;
    /**
     * Ensure SDK is initialized
     * @private
     */
    private ensureInitialized;
    /**
     * Creates a new referral code
     * @param discountType - Type of discount ('percentage' | 'amount')
     * @param discountValue - Discount value (percentage 0-100 or fixed amount)
     * @param usageLimit - Optional maximum usage limit
     * @param code - Optional custom referral code. If provided, will validate it with clientId and check if it's available
     * @returns CreateCodeResponse with generated code or error
     */
    createCode(discountType: DiscountType, discountValue: number, usageLimit?: number, code?: string): Promise<CreateCodeResponse>;
    /**
     * Verifies a referral code and returns validation status with discount information
     * @param code - The referral code to verify
     * @param originalAmount - Optional original amount for discount calculation
     * @returns VerifyCodeResponse with validation status and discount info
     */
    verifyCode(code: string, originalAmount?: number): Promise<VerifyCodeResponse>;
    /**
     * Increments the usage count of a referral code
     * Automatically deactivates if usage limit is reached
     * @param code - The referral code to increment usage for
     * @returns IncrementUsageResponse with updated usage count and active status
     */
    incrementUsage(code: string): Promise<IncrementUsageResponse>;
    /**
     * Get the validated client ID
     * @returns Client ID that was validated during init
     */
    getClientId(): string;
    /**
     * Check if SDK is initialized
     * @returns True if initialized, false otherwise
     */
    isReady(): boolean;
}