interface SendEmailOptions {
    to: string;
    subject: string;
    replyTo?: string;
    html: string;
    text: string;
}
interface SendEmailResult {
    success: boolean;
    messageId?: string;
    testMode: boolean;
}
interface SendCampaignEmailOptions {
    recipientEmail: string;
    recipientName?: string;
    recipientLevel?: string;
    userEmail: string;
    userName: string;
    postalCode: string;
    subject: string;
    message: string;
    campaignTitle: string;
}
declare class EmailService {
    private transporter;
    constructor();
    private createTransporter;
    /** Rebuild transporter from DB settings (with env fallback). Call after SMTP settings change. */
    rebuildTransporter(): Promise<void>;
    testConnection(): Promise<boolean>;
    /**
     * Load template from database (with caching)
     */
    private loadTemplateFromDatabase;
    /**
     * Load template - checks database first, falls back to filesystem
     * @param name Template key (e.g., "campaign-email")
     * @param type File type (html or txt) - only used for filesystem fallback
     */
    loadTemplate(name: string, type: 'html' | 'txt'): string;
    /**
     * Clear database template cache
     * @param key Optional specific template key to clear. If not provided, clears all.
     */
    clearDatabaseCache(key?: string): void;
    escapeHtml(unsafe: string): string;
    /**
     * Fetch video metadata from Media API
     */
    private getVideoMetadata;
    processTemplate(template: string, vars: Record<string, string>, variableDefinitions?: Array<{
        key: string;
        type: string;
        videoId?: number;
    }>): Promise<string>;
    /**
     * Process text template (for plain text emails)
     */
    processTextTemplate(template: string, vars: Record<string, string>, variableDefinitions?: Array<{
        key: string;
        type: string;
        videoId?: number;
    }>): Promise<string>;
    /**
     * Process subject line template
     * Same as processTemplate but without HTML escaping
     */
    processSubject(subject: string, vars: Record<string, string>): string;
    private getFromField;
    private getOrganizationName;
    private getEmailTestConfig;
    sendEmail(options: SendEmailOptions): Promise<SendEmailResult>;
    sendCampaignEmail(options: SendCampaignEmailOptions): Promise<SendEmailResult>;
    sendResponseVerification(options: {
        recipientEmail: string;
        campaignTitle: string;
        responseType: string;
        responseText: string;
        submitterName: string;
        verificationUrl: string;
        reportUrl: string;
    }): Promise<SendEmailResult>;
}
export declare const emailService: EmailService;
export {};
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