/**
 * Count total conditions in an expression
 */
export declare function countConditions(expr: QLExpression): number;

export declare type FieldType = 'text' | 'number' | 'date' | 'datetime' | 'boolean' | 'option' | 'multiselect' | 'user';

/**
 * Get all field names used in an expression
 */
export declare function getUsedFields(expr: QLExpression): string[];

/**
 * Helper functions to work with QL expressions and convert them to database queries
 */
export declare function isCondition(expr: QLExpression): expr is QLCondition;

export declare function isLogicalGroup(expr: QLExpression): expr is QLLogicalGroup;

export declare type LogicalOperatorType = 'AND' | 'OR' | 'NOT';

export declare type OperatorType = '=' | '!=' | '>' | '<' | '>=' | '<=' | '~' | '!~' | 'IN' | 'NOT IN' | 'IS EMPTY' | 'IS NOT EMPTY' | 'WAS' | 'WAS IN' | 'WAS NOT IN' | 'CHANGED';

export declare interface ParseContext {
    input: string;
    position: number;
    tokens: QLToken[];
    currentToken?: QLToken;
    expectingField: boolean;
    expectingOperator: boolean;
    expectingValue: boolean;
    expectingLogical: boolean;
    parenthesesLevel: number;
    inOrderBy: boolean;
    lastField?: string;
}

/**
 * Pretty print expression for debugging
 */
export declare function printExpression(expr: QLExpression, indent?: number): string;

export declare interface QLCondition {
    field: string;
    operator: OperatorType;
    value?: string | string[];
    not?: boolean;
}

export declare type QLExpression = QLCondition | QLLogicalGroup;

/**
 * Enhanced QL Expression Parser
 * Builds hierarchical expression trees that properly represent logical grouping
 */
export declare class QLExpressionParser {
    private tokens;
    private position;
    parse(tokens: QLToken[]): QLExpression | null;
    private parseExpression;
    private parseOrExpression;
    private parseAndExpression;
    private parsePrimaryExpression;
    private parseCondition;
    private parseValue;
    private parseFunctionCall;
    private parseInList;
    private operatorRequiresValue;
    private current;
    private advance;
    private isLogicalGroup;
}

export declare interface QLField {
    name: string;
    displayName: string;
    type: FieldType;
    operators: OperatorType[];
    sortable?: boolean;
    description?: string;
    options?: QLValue[];
    asyncValueSuggestions?: boolean;
}

export declare interface QLFunction {
    name: string;
    displayName: string;
    description?: string;
    parameters?: {
        name: string;
        type: FieldType;
        required: boolean;
        description?: string;
    }[];
}

export declare interface QLInputConfig {
    fields: QLField[];
    functions?: QLFunction[];
    operators?: OperatorType[];
    logicalOperators?: LogicalOperatorType[];
    keywords?: string[];
    maxSuggestions?: number;
    debounceMs?: number;
    caseSensitive?: boolean;
    allowParentheses?: boolean;
    allowOrderBy?: boolean;
    allowFunctions?: boolean;
}

export declare interface QLInputProps {
    value?: string;
    onChange?: (value: string, query: QLQuery) => void;
    onExecute?: (query: QLQuery) => void;
    config: QLInputConfig;
    placeholder?: string;
    disabled?: boolean;
    className?: string;
    showSearchIcon?: boolean;
    showClearIcon?: boolean;
    getAsyncValueSuggestions?: (field: string, typedValue: string) => Promise<QLValue[]>;
    getPredefinedValueSuggestions?: (field: string) => QLValue[];
}

export declare interface QLInputState {
    value: string;
    tokens: QLToken[];
    suggestions: QLSuggestion[];
    showSuggestions: boolean;
    selectedSuggestionIndex: number;
    cursorPosition: number;
    query: QLQuery;
    validationErrors: ValidationError[];
    isLoading: boolean;
    justSelectedSuggestion: boolean;
}

export declare interface QLLogicalGroup {
    operator: LogicalOperatorType;
    conditions: (QLCondition | QLLogicalGroup)[];
    not?: boolean;
}

export declare interface QLOrderBy {
    field: string;
    direction: SortDirection;
}

export declare class QLParser {
    constructor(_config: QLInputConfig);
    /**
     * Tokenize the input string into QL tokens
     */
    tokenize(input: string): QLToken[];
    /**
     * Classify unknown tokens based on context
     */
    private classifyTokens;
    /**
     * Parse tokens into a QL query object
     */
    parse(input: string): QLQuery;
    private splitQuery;
    private parseOrderBy;
}

export declare interface QLQuery {
    where?: QLExpression;
    orderBy?: QLOrderBy[];
    raw: string;
    valid: boolean;
    errors: string[];
}

export declare interface QLSuggestion {
    type: 'field' | 'operator' | 'value' | 'logical' | 'keyword' | 'function' | 'parenthesis' | 'comma';
    value: string;
    displayValue?: string;
    description?: string;
    insertText?: string;
    category?: string;
}

export declare interface QLToken {
    type: 'field' | 'operator' | 'value' | 'logical' | 'keyword' | 'function' | 'parenthesis' | 'comma' | 'whitespace' | 'unknown';
    value: string;
    start: number;
    end: number;
    valid?: boolean;
    error?: string;
}

export declare interface QLValue {
    value: string;
    displayValue?: string;
    description?: string;
}

export declare type SortDirection = 'ASC' | 'DESC';

export declare interface SuggestionContext {
    input: string;
    cursorPosition: number;
    tokens: QLToken[];
    currentToken?: QLToken;
    previousToken?: QLToken;
    nextToken?: QLToken;
    expectingField: boolean;
    expectingOperator: boolean;
    expectingValue: boolean;
    expectingLogical: boolean;
    inOrderBy: boolean;
    parenthesesLevel: number;
    inInList: boolean;
    lastField?: string;
    lastOperator?: string;
    partialInput?: string;
}

/**
 * Convert QL expression to Mongoose query
 */
export declare function toMongooseQuery(expr: QLExpression): any;

/**
 * Convert QL expression to SQL WHERE clause
 */
export declare function toSQLQuery(expr: QLExpression): string;

export declare interface ValidationError {
    message: string;
    start: number;
    end: number;
    severity: 'error' | 'warning';
}

export { }