import { StructuredTool } from '@langchain/core/tools';
import { ZodError, z } from 'zod';
import { Logger } from '@hashgraphonline/standards-sdk';
import { FormMessage, FormSubmission } from './types';

/**
 * Tool execution result with optional form requirement
 */
export interface ToolExecutionResult {
    success: boolean;
    output: string;
    metadata?: Record<string, unknown>;
    requiresForm?: boolean;
    formMessage?: FormMessage;
    error?: string;
}
/**
 * Context for form generation operations
 */
export interface FormGenerationContext {
    tool: StructuredTool;
    input: unknown;
    sessionId?: string;
    userId?: string;
    missingFields?: Set<string>;
}
/**
 * FormEngine handles all form generation and validation logic
 */
export declare class FormEngine {
    private formGenerator;
    private logger;
    constructor(logger?: Logger);
    /**
     * Generate a form for a tool with the given input
     */
    generateForm(toolName: string, tool: StructuredTool, input: unknown, context?: Partial<FormGenerationContext>): Promise<FormMessage | null>;
    /**
     * Process a form submission
     */
    processSubmission(submission: FormSubmission, context?: {
        originalInput?: Record<string, unknown>;
        schema?: unknown;
    }): Promise<Record<string, unknown>>;
    /**
     * Check if a tool requires form generation based on input
     */
    shouldGenerateForm(tool: StructuredTool, input: unknown): boolean;
    /**
     * Generate form from error context
     */
    generateFormFromError(error: ZodError, toolName: string, toolSchema: z.ZodSchema, originalPrompt: string): Promise<FormMessage>;
    /**
     * Generate form for FormValidatable tools
     */
    private generateFormValidatableForm;
    /**
     * Generate form based on schema validation
     */
    private generateSchemaBasedForm;
    /**
     * Generate form based on render config
     */
    private generateRenderConfigForm;
    /**
     * Generate form from Zod validation error
     */
    private generateErrorBasedForm;
    /**
     * Validate input against tool schema
     */
    private validateInput;
    /**
     * Check if schema is ZodObject
     */
    private isZodObject;
    /**
     * Check if tool has render configuration
     */
    private hasRenderConfig;
    /**
     * Extract render configuration from tool
     */
    private extractRenderConfig;
    /**
     * Resolve form schema for FormValidatable tools
     */
    private resolveFormSchema;
    /**
     * Determine missing fields for form generation
     */
    private determineMissingFields;
    /**
     * Generate form with resolved schema
     */
    private generateFormWithSchema;
    /**
     * Validate form submission
     */
    private validateSubmission;
    /**
     * Extract base tool input from context
     */
    private extractBaseToolInput;
    /**
     * Extract submission data
     */
    private extractSubmissionData;
    /**
     * Merge input data
     */
    private mergeInputData;
    /**
     * Get registered strategies
     */
    getRegisteredStrategies(): string[];
    /**
     * Get registered middleware
     */
    getRegisteredMiddleware(): string[];
}