/* eslint-disable valid-jsdoc */
/* eslint-disable security/detect-object-injection */
import { merge, isNullOrUndefined } from '@syncfusion/ej2-base';
import { DataManager } from './manager';
import { Query, Predicate } from './query';
import { ReturnType } from './adaptors';
const consts: { [key: string]: string } = { GroupGuid: '{271bbba0-1ee7}' };

/**
 * Data manager common utility methods.
 *
 * @hidden
 */
export class DataUtil {
    /**
     * Specifies the value which will be used to adjust the date value to server timezone.
     *
     * @default null
     */
    public static serverTimezoneOffset: number = null;

    /**
     * Species whether are not to be parsed with serverTimezoneOffset value.
     *
     * @hidden
     */
    public static timeZoneHandling: boolean = true;

    /**
     * Returns the value by invoking the provided parameter function.
     * If the paramater is not of type function then it will be returned as it is.
     *
     * @param {Function|string|string[]|number} value
     * @param {Object} inst?
     * @param inst
     * @hidden
     */
    public static getValue<T>(value: T | Function, inst?: Object): T {
        if (typeof value === 'function') {
            return (<Function>value).call(inst || {});
        }
        return <T>value;
    }

    /**
     * Returns true if the input string ends with given string.
     *
     * @param  {string} input
     * @param  {string} substr
     */
    public static endsWith(input: string, substr: string): boolean {
        return input.slice && input.slice(-substr.length) === substr;
    }

    /**
     * Returns true if the input string not ends with given string.
     *
     * @param  {string} input
     * @param  {string} substr
     */
    public static notEndsWith(input: string, substr: string): boolean {
        return input.slice && input.slice(-substr.length) !== substr;
    }

    /**
     * Returns true if the input string starts with given string.
     *
     * @param {string} str
     * @param {string} startstr
     * @param input
     * @param start
     */
    public static startsWith(input: string, start: string): boolean {
        return input.slice(0, start.length) === start;
    }

    /**
     * Returns true if the input string not starts with given string.
     *
     * @param {string} str
     * @param {string} startstr
     * @param input
     * @param start
     */
    public static notStartsWith(input: string, start: string): boolean {
        return input.slice(0, start.length) !== start;
    }

    /**
     * Returns true if the input string pattern(wildcard) matches with given string.
     *
     * @param {string} str
     * @param {string} startstr
     * @param input
     * @param pattern
     */
    public static wildCard(input: string, pattern: string): boolean {
        let asteriskSplit: string[];
        let optionalSplit: string[];
        // special character allowed search
        if (pattern.indexOf('[') !== -1) {
            pattern = pattern.split('[').join('[[]');
        }
        if (pattern.indexOf('(') !== -1) {
            pattern = pattern.split('(').join('[(]');
        }
        if (pattern.indexOf(')') !== -1) {
            pattern = pattern.split(')').join('[)]');
        }
        if (pattern.indexOf('\\') !== -1) {
            pattern = pattern.split('\\').join('[\\\\]');
        }
        if (pattern.indexOf('*') !== -1) {
            if (pattern.charAt(0) !== '*') {
                pattern = '^' + pattern;
            }
            if (pattern.charAt(pattern.length - 1) !== '*') {
                pattern = pattern + '$';
            }
            asteriskSplit = pattern.split('*');
            for (let i: number = 0; i < asteriskSplit.length; i++) {
                if (asteriskSplit[i].indexOf('.') === -1) {
                    asteriskSplit[i] = asteriskSplit[i] + '.*';
                }
                else {
                    asteriskSplit[i] = asteriskSplit[i] + '*';
                }
            }
            pattern = asteriskSplit.join('');
        }
        if (pattern.indexOf('%3f') !== -1 || pattern.indexOf('?') !== -1) {
            optionalSplit = pattern.indexOf('%3f') !== -1 ? pattern.split('%3f') : pattern.split('?');
            pattern = optionalSplit.join('.');
        }
        // eslint-disable-next-line security/detect-non-literal-regexp
        const regexPattern: RegExp = new RegExp(pattern, 'g');
        return regexPattern.test(input);
    }

    /**
     * Returns true if the input string pattern(like) matches with given string.
     *
     * @param {string} str
     * @param {string} startstr
     * @param input
     * @param pattern
     */
    public static like(input: string, pattern: string): boolean {
        if (pattern.indexOf('%') !== -1) {
            if (pattern.charAt(0) === '%' && pattern.lastIndexOf('%') < 2) {
                pattern = pattern.substring(1, pattern.length);
                return DataUtil.startsWith(DataUtil.toLowerCase(input), DataUtil.toLowerCase(pattern));
            }
            else if (pattern.charAt(pattern.length - 1) === '%' && pattern.indexOf('%') > pattern.length - 3) {
                pattern = pattern.substring(0, pattern.length - 1);
                return DataUtil.endsWith(DataUtil.toLowerCase(input), DataUtil.toLowerCase(pattern));
            }
            else if (pattern.lastIndexOf('%') !== pattern.indexOf('%') && pattern.lastIndexOf('%') > pattern.indexOf('%') + 1) {
                pattern = pattern.substring(pattern.indexOf('%') + 1, pattern.lastIndexOf('%'));
                return input.indexOf(pattern) !== -1;
            }
            else {
                return input.indexOf(pattern) !== -1;
            }
        }
        else {
            return false;
        }
    }

    /**
     * To return the sorting function based on the string.
     *
     * @param  {string} order
     * @hidden
     */
    public static fnSort(order: string): Function {
        order = order ? DataUtil.toLowerCase(order) : 'ascending';
        if (order === 'ascending') {
            return this.fnAscending;
        }
        return this.fnDescending;
    }

    /**
     * Comparer function which is used to sort the data in ascending order.
     *
     * @param  {string|number} x
     * @param  {string|number} y
     * @returns number
     */
    public static fnAscending(x: string | number, y: string | number)
        : number {
        if (isNullOrUndefined(x) && isNullOrUndefined(y)) {
            return 0;
        }
        if (y === null || y === undefined) {
            return -1;
        }
        if (typeof x === 'string') {
            return x.localeCompare(<string>y);
        }
        if (x === null || x === undefined) {
            return 1;
        }
        return <number>x - <number>y;
    }
    /**
     * Comparer function which is used to sort the data in descending order.
     *
     * @param  {string|number} x
     * @param  {string|number} y
     * @returns number
     */
    public static fnDescending(x: string | number, y: string | number)
        : number {
        if (isNullOrUndefined(x) && isNullOrUndefined(y)) {
            return 0;
        }
        if (y === null || y === undefined) {
            return 1;
        }
        if (typeof x === 'string') {
            return x.localeCompare(y as string) * -1;
        }
        if (x === null || x === undefined) {
            return -1;
        }

        return <number>y - <number>x;
    }
    private static extractFields(obj: Object, fields: string[]): Object {
        let newObj: { [key: string]: Object } | Object = {};

        for (let i: number = 0; i < fields.length; i++) {
            newObj = this.setValue(fields[i], this.getObject(fields[i], obj), newObj);
        }

        return newObj;
    }

    /**
     * Select objects by given fields from jsonArray.
     *
     * @param  {Object[]} jsonArray
     * @param  {string[]} fields
     */
    public static select(jsonArray: Object[], fields: string[]): Object[] {
        const newData: Object[] = [];

        for (let i: number = 0; i < jsonArray.length; i++) {
            newData.push(this.extractFields(jsonArray[i], fields));
        }
        return newData;
    }

    /**
     * Group the input data based on the field name.
     * It also performs aggregation of the grouped records based on the aggregates paramater.
     *
     * @param {Object[]} jsonArray
     * @param {string} field?
     * @param {Object[]} agg?
     * @param {number} level?
     * @param {Object[]} groupDs?
     * @param field
     * @param aggregates
     * @param level
     * @param groupDs
     * @param format
     * @param isLazyLoad
     */
    public static group(
        jsonArray: Object[], field?: string, aggregates?: Object[], level?: number,
        groupDs?: Object[], format?: Function, isLazyLoad?: boolean
    ): Object[] {
        level = level || 1;
        const jsonData: Group[] = jsonArray;
        const guid: string = 'GroupGuid';
        if ((<Group>jsonData).GroupGuid === consts[guid]) {
            for (let j: number = 0; j < jsonData.length; j++) {
                if (!isNullOrUndefined(groupDs)) {
                    let indx: number = -1;
                    const temp: Group[] = groupDs.filter((e: { key: string }) => { return e.key === jsonData[j].key; });
                    indx = groupDs.indexOf(temp[0]);
                    jsonData[j].items = this.group(
                        jsonData[j].items, field, aggregates, (jsonData as Group).level + 1,
                        (groupDs as Group[])[indx].items, format, isLazyLoad
                    );
                    jsonData[j].count = (groupDs as Group[])[indx].count;
                } else {
                    jsonData[j].items = this.group(
                        jsonData[j].items, field, aggregates, (jsonData as Group).level + 1, null, format, isLazyLoad
                    );
                    jsonData[j].count = jsonData[j].items.length;
                }
            }

            (jsonData as Group).childLevels += 1;
            return jsonData;
        }

        const grouped: { [key: string]: Group } = {};
        const groupedArray: Group[] = [];

        (groupedArray as Group).GroupGuid = consts[guid];
        (groupedArray as Group).level = level;
        (groupedArray as Group).childLevels = 0;
        (groupedArray as Group).records = jsonData;

        for (let i: number = 0; i < jsonData.length; i++) {
            let val: string = (<string>this.getVal(jsonData, i, field));
            if (!isNullOrUndefined(format)) {
                val = format(val, field);
            }
            if (!grouped[val]) {
                grouped[val] = {
                    key: val,
                    count: 0,
                    items: [],
                    aggregates: {},
                    field: field
                };
                groupedArray.push(grouped[val]);
                if (!isNullOrUndefined(groupDs)) {
                    const tempObj: Group[] = groupDs.filter((e: { key: string }) => { return e.key === grouped[val].key; });
                    grouped[val].count = tempObj[0].count;
                }
            }

            grouped[val].count = !isNullOrUndefined(groupDs) ? grouped[val].count : grouped[val].count += 1;
            if (!isLazyLoad || (isLazyLoad && aggregates.length)) {
                grouped[val].items.push(jsonData[i]);
            }
        }
        if (aggregates && aggregates.length) {

            for (let i: number = 0; i < groupedArray.length; i++) {
                const res: { [key: string]: Object } = {};
                let fn: Function;
                const aggs: Aggregates[] = aggregates as Aggregates[];
                for (let j: number = 0; j < aggregates.length; j++) {
                    fn = DataUtil.aggregates[(aggregates[j] as Aggregates).type];
                    if (!isNullOrUndefined(groupDs)) {
                        const temp: Group[] = groupDs.filter((e: { key: string }) => { return e.key === groupedArray[i].key; });
                        if (fn) {
                            res[aggs[j].field + ' - ' + aggs[j].type] = fn(temp[0].items, aggs[j].field);
                        }
                    } else {
                        if (fn) {
                            res[aggs[j].field + ' - ' + aggs[j].type] = fn(groupedArray[i].items, aggs[j].field);
                        }
                    }
                }
                groupedArray[i].aggregates = res;
            }
        }
        if (isLazyLoad && groupedArray.length && aggregates.length) {
            for (let i: number = 0; i < groupedArray.length; i++) {
                groupedArray[i].items = [];
            }
        }
        return jsonData.length && groupedArray || jsonData;
    }

    /**
     * It is used to categorize the multiple items based on a specific field in jsonArray.
     * The hierarchical queries are commonly required when you use foreign key binding.
     *
     * @param {string} fKey
     * @param {string} from
     * @param {Object[]} source
     * @param {Group} lookup?
     * @param {string} pKey?
     * @param lookup
     * @param pKey
     * @hidden
     */
    public static buildHierarchy(fKey: string, from: string, source: Group, lookup?: Group, pKey?: string): void {
        let i: number;
        const grp: { [key: string]: Object[] } = {};
        let temp: Object[];
        if (lookup.result) { lookup = lookup.result; }

        if (lookup.GroupGuid) {
            this.throwError('DataManager: Do not have support Grouping in hierarchy');
        }

        for (i = 0; i < (<Group[]>lookup).length; i++) {
            const fKeyData: number = (<number>this.getObject(fKey, (<Group[]>lookup)[i]));
            temp = grp[fKeyData] || (grp[fKeyData] = []);
            temp.push((<Group[]>lookup)[i]);
        }

        for (i = 0; i < (<Group[]>source).length; i++) {
            const fKeyData: number = (<number>this.getObject(pKey || fKey, (<Group[]>source)[i]));
            (<Group[]>source)[i][from] = grp[fKeyData];
        }
    }

    /**
     * Throw error with the given string as message.
     *
     * @param {string} er
     * @param error
     */
    public static throwError: Function = (error: string) => {
        try {
            throw new Error(error);
        } catch (e) {
            // eslint-disable-next-line no-throw-literal
            throw e.message + '\n' + e.stack;
        }
    }

    public static aggregates: Aggregates = {
        /**
         * Calculate sum of the given field in the data.
         *
         * @param  {Object[]} ds
         * @param  {string} field
         */
        sum: (ds: Object[], field: string): number => {
            let result: number = 0;
            let val: number;
            const castRequired: boolean = typeof DataUtil.getVal(ds, 0, field) !== 'number';

            for (let i: number = 0; i < ds.length; i++) {
                val = DataUtil.getVal(ds, i, field) as number;
                if (!isNaN(val) && val !== null) {
                    if (castRequired) {
                        val = +val;
                    }
                    result += val;
                }
            }
            return result;
        },
        /**
         * Calculate average value of the given field in the data.
         *
         * @param  {Object[]} ds
         * @param  {string} field
         */
        average: (ds: Object[], field: string): number => {
            return DataUtil.aggregates.sum(ds, field) / ds.length;
        },
        /**
         * Returns the min value of the data based on the field.
         *
         * @param  {Object[]} ds
         * @param  {string|Function} field
         */
        min: (ds: Object[], field: string | Function) => {
            let comparer: Function;
            if (typeof field === 'function') {
                comparer = <Function>field;
                field = null;
            }
            return DataUtil.getObject(<string>field, DataUtil.getItemFromComparer(ds, <string>field, comparer || DataUtil.fnAscending));
        },
        /**
         * Returns the max value of the data based on the field.
         *
         * @param  {Object[]} ds
         * @param  {string} field
         * @returns number
         */
        max: (ds: Object[], field: string | Function) => {
            let comparer: Function;
            if (typeof field === 'function') {
                comparer = <Function>field;
                field = null;
            }
            return DataUtil.getObject(<string>field, DataUtil.getItemFromComparer(ds, <string>field, comparer || DataUtil.fnDescending));
        },
        /**
         * Returns the total number of true value present in the data based on the given boolean field name.
         *
         * @param  {Object[]} ds
         * @param  {string} field
         */
        truecount: (ds: Object[], field: string): number => {
            return new DataManager(ds as JSON[]).executeLocal(new Query().where(field, 'equal', true, true)).length;
        },
        /**
         * Returns the total number of false value present in the data based on the given boolean field name.
         *
         * @param  {Object[]} ds
         * @param  {string} field
         */
        falsecount: (ds: Object[], field: string): number => {
            return new DataManager(ds as JSON[]).executeLocal(new Query().where(field, 'equal', false, true)).length;
        },
        /**
         * Returns the length of the given data.
         *
         * @param {Object[]} ds
         * @param {string} field?
         * @param field
         * @returns number
         */
        count: (ds: Object[], field?: string): number => {
            return ds.length;
        }
    };

    /**
     * The method used to get the field names which started with specified characters.
     *
     * @param {Object} obj
     * @param {string[]} fields?
     * @param {string} prefix?
     * @param fields
     * @param prefix
     * @hidden
     */
    public static getFieldList(obj: Object, fields?: string[], prefix?: string): string[] {
        if (prefix === undefined) {
            prefix = '';
        }
        if (fields === undefined || fields === null) {
            return this.getFieldList(obj, [], prefix);
        }
        const copyObj: { [key: string]: Object } = (obj as { [key: string]: Object });
        const keys: string[] = Object.keys(obj);
        for (const prop of keys) {
            if (typeof copyObj[prop] === 'object' && !(copyObj[prop] instanceof Array)) {
                this.getFieldList((copyObj[prop] as Object), fields, prefix + prop + '.');
            } else {
                fields.push(prefix + prop);
            }
        }
        return fields;
    }

    /**
     * Gets the value of the property in the given object.
     * The complex object can be accessed by providing the field names concatenated with dot(.).
     *
     * @param  {string} nameSpace - The name of the property to be accessed.
     * @param  {Object} from - Defines the source object.
     */
    public static getObject(nameSpace: string, from: Object): Object {
        if (!nameSpace) {
            return from;
        }
        if (!from) {
            return undefined;
        }
        if (nameSpace.indexOf('.') === -1) {
            if (!isNullOrUndefined(from[nameSpace])) {
                return from[nameSpace];
            }
            else {
                const lowerCaseNameSpace: string = nameSpace.charAt(0).toLowerCase() + nameSpace.slice(1);
                const upperCaseNameSpace: string = nameSpace.charAt(0).toUpperCase() + nameSpace.slice(1);
                if (!isNullOrUndefined(from[lowerCaseNameSpace])) {
                    return from[lowerCaseNameSpace];
                } else if (!isNullOrUndefined(from[upperCaseNameSpace])) {
                    return from[upperCaseNameSpace];
                } else {
                    return null;
                }
            }
        }
        let value: Object = from;
        const splits: string[] = nameSpace.split('.');
        for (let i: number = 0; i < splits.length; i++) {
            if (value == null) {
                break;
            }
            value = value[splits[i]];
            if (value === undefined) {
                const casing: string = splits[i].charAt(0).toUpperCase() + splits[i].slice(1);
                value = from[casing] || from[casing.charAt(0).toLowerCase() + casing.slice(1)] || null;
            }
            from = value;
        }
        return value;
    }

    /**
     * To set value for the nameSpace in desired object.
     *
     * @param {string} nameSpace - String value to the get the inner object.
     * @param {Object} value - Value that you need to set.
     * @param {Object} obj - Object to get the inner object value.
     * @return { [key: string]: Object; } | Object
     * @hidden
     */
    public static setValue(nameSpace: string, value: Object | null, obj: Object): { [key: string]: Object; } | Object {
        const keys: string[] = nameSpace.toString().split('.');
        const start: Object = obj || {};
        let fromObj: Object = start;
        let i: number;
        const length: number = keys.length;
        let key: string;
        for (i = 0; i < length; i++) {
            key = keys[i];
            if (i + 1 === length) {
                fromObj[key] = value === undefined ? undefined : value;
            } else if (isNullOrUndefined(fromObj[key])) {
                fromObj[key] = {};
            }
            fromObj = fromObj[key];
        }
        return start;
    }

    /**
     * Sort the given data based on the field and comparer.
     *
     * @param  {Object[]} dataSource - Defines the input data.
     * @param  {string} field - Defines the field to be sorted.
     * @param  {Function} comparer - Defines the comparer function used to sort the records.
     */
    public static sort(dataSource: Object[], field: string, comparer: Function): Object[] {
        if (dataSource.length <= 1) {
            return dataSource;
        }
        return dataSource.slice()
            .sort((a: Object, b: Object) => (<Function>comparer)(this.getVal([a], 0, field), this.getVal([b], 0, field), a, b));
    }
    public static ignoreDiacritics(value: string | number | Date | boolean): string | Object {
        if (typeof value !== 'string') {
            return value;
        }
        const result: string[] = value.split('');
        const newValue: string[] = result.map((temp: string) => temp in DataUtil.diacritics ? DataUtil.diacritics[temp] : temp);
        return newValue.join('');
    }
    public static ignoreDiacriticsForArrays(valueArray: Array<string | number | Date>): Array<string | number> {
        if (!Array.isArray(valueArray)) {
            return [];
        }
        return valueArray.map(item => {
            return DataUtil.ignoreDiacritics(item) as string | number;
        });
    }

    private static merge(left: Object[], right: Object[], fieldName: string, comparer: Function): Object[] {
        const result: Object[] = [];
        let current: Object[];

        while (left.length > 0 || right.length > 0) {
            if (left.length > 0 && right.length > 0) {
                if (comparer) {
                    current = (<Function>comparer)(this.getVal(left, 0, fieldName), this.getVal(right, 0, fieldName),
                                                   left[0], right[0]) <= 0 ? left : right;
                } else {
                    current = left[0][fieldName] < left[0][fieldName] ? left : right;
                }
            } else {
                current = left.length > 0 ? left : right;
            }
            result.push(current.shift());
        }
        return result;
    }
    private static getVal(array: Object[], index: number, field?: string): Object {
        return field ? this.getObject(field, array[index]) : array[index];
    }
    private static toLowerCase(val: string | number | boolean | Date): string {
        if (isNullOrUndefined(val)) return '';
        if (typeof val === 'string') return val.toLowerCase();
        if (val instanceof Date) return val.toString().toLowerCase();
        return val.toString();
    }
    /**
     * Specifies the Object with filter operators.
     */
    public static operatorSymbols: { [key: string]: string } = {
        '<': 'lessthan',
        '>': 'greaterthan',
        '<=': 'lessthanorequal',
        '>=': 'greaterthanorequal',
        '==': 'equal',
        '!=': 'notequal',
        '*=': 'contains',
        '$=': 'endswith',
        '^=': 'startswith'
    };
    /**
     * Specifies the Object with filter operators which will be used for OData filter query generation.
     * * It will be used for date/number type filter query.
     */
    public static odBiOperator: { [key: string]: string } = {
        '<': ' lt ',
        '>': ' gt ',
        '<=': ' le ',
        '>=': ' ge ',
        '==': ' eq ',
        '!=': ' ne ',
        'lessthan': ' lt ',
        'lessthanorequal': ' le ',
        'greaterthan': ' gt ',
        'greaterthanorequal': ' ge ',
        'equal': ' eq ',
        'notequal': ' ne '
    };
    /**
     * Specifies the Object with filter operators which will be used for OData filter query generation.
     * It will be used for string type filter query.
     */
    public static odUniOperator: { [key: string]: string } = {
        '$=': 'endswith',
        '^=': 'startswith',
        '*=': 'substringof',
        'endswith': 'endswith',
        'startswith': 'startswith',
        'contains': 'substringof',
        'doesnotendwith': 'not endswith',
        'doesnotstartwith': 'not startswith',
        'doesnotcontain': 'not substringof',
        'wildcard': 'wildcard',
        'like': 'like'
    };

    /**
     * Specifies the Object with filter operators which will be used for ODataV4 filter query generation.
     * It will be used for string type filter query.
     */
    public static odv4UniOperator: { [key: string]: string } = {
        '$=': 'endswith',
        '^=': 'startswith',
        '*=': 'contains',
        'endswith': 'endswith',
        'startswith': 'startswith',
        'contains': 'contains',
        'doesnotendwith': 'not endswith',
        'doesnotstartwith': 'not startswith',
        'doesnotcontain': 'not contains',
        'wildcard': 'wildcard',
        'like': 'like'
    };
    public static diacritics: { [key: string]: string } = {
        '\u24B6': 'A',
        '\uFF21': 'A',
        '\u00C0': 'A',
        '\u00C1': 'A',
        '\u00C2': 'A',
        '\u1EA6': 'A',
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        '\u015B': 's',
        '\u1E65': 's',
        '\u015D': 's',
        '\u1E61': 's',
        '\u0161': 's',
        '\u1E67': 's',
        '\u1E63': 's',
        '\u1E69': 's',
        '\u0219': 's',
        '\u015F': 's',
        '\u023F': 's',
        '\uA7A9': 's',
        '\uA785': 's',
        '\u1E9B': 's',
        '\u24E3': 't',
        '\uFF54': 't',
        '\u1E6B': 't',
        '\u1E97': 't',
        '\u0165': 't',
        '\u1E6D': 't',
        '\u021B': 't',
        '\u0163': 't',
        '\u1E71': 't',
        '\u1E6F': 't',
        '\u0167': 't',
        '\u01AD': 't',
        '\u0288': 't',
        '\u2C66': 't',
        '\uA787': 't',
        '\uA729': 'tz',
        '\u24E4': 'u',
        '\uFF55': 'u',
        '\u00F9': 'u',
        '\u00FA': 'u',
        '\u00FB': 'u',
        '\u0169': 'u',
        '\u1E79': 'u',
        '\u016B': 'u',
        '\u1E7B': 'u',
        '\u016D': 'u',
        '\u00FC': 'u',
        '\u01DC': 'u',
        '\u01D8': 'u',
        '\u01D6': 'u',
        '\u01DA': 'u',
        '\u1EE7': 'u',
        '\u016F': 'u',
        '\u0171': 'u',
        '\u01D4': 'u',
        '\u0215': 'u',
        '\u0217': 'u',
        '\u01B0': 'u',
        '\u1EEB': 'u',
        '\u1EE9': 'u',
        '\u1EEF': 'u',
        '\u1EED': 'u',
        '\u1EF1': 'u',
        '\u1EE5': 'u',
        '\u1E73': 'u',
        '\u0173': 'u',
        '\u1E77': 'u',
        '\u1E75': 'u',
        '\u0289': 'u',
        '\u24E5': 'v',
        '\uFF56': 'v',
        '\u1E7D': 'v',
        '\u1E7F': 'v',
        '\u028B': 'v',
        '\uA75F': 'v',
        '\u028C': 'v',
        '\uA761': 'vy',
        '\u24E6': 'w',
        '\uFF57': 'w',
        '\u1E81': 'w',
        '\u1E83': 'w',
        '\u0175': 'w',
        '\u1E87': 'w',
        '\u1E85': 'w',
        '\u1E98': 'w',
        '\u1E89': 'w',
        '\u2C73': 'w',
        '\u24E7': 'x',
        '\uFF58': 'x',
        '\u1E8B': 'x',
        '\u1E8D': 'x',
        '\u24E8': 'y',
        '\uFF59': 'y',
        '\u1EF3': 'y',
        '\u00FD': 'y',
        '\u0177': 'y',
        '\u1EF9': 'y',
        '\u0233': 'y',
        '\u1E8F': 'y',
        '\u00FF': 'y',
        '\u1EF7': 'y',
        '\u1E99': 'y',
        '\u1EF5': 'y',
        '\u01B4': 'y',
        '\u024F': 'y',
        '\u1EFF': 'y',
        '\u24E9': 'z',
        '\uFF5A': 'z',
        '\u017A': 'z',
        '\u1E91': 'z',
        '\u017C': 'z',
        '\u017E': 'z',
        '\u1E93': 'z',
        '\u1E95': 'z',
        '\u01B6': 'z',
        '\u0225': 'z',
        '\u0240': 'z',
        '\u2C6C': 'z',
        '\uA763': 'z',
        '\u0386': '\u0391',
        '\u0388': '\u0395',
        '\u0389': '\u0397',
        '\u038A': '\u0399',
        '\u03AA': '\u0399',
        '\u038C': '\u039F',
        '\u038E': '\u03A5',
        '\u03AB': '\u03A5',
        '\u038F': '\u03A9',
        '\u03AC': '\u03B1',
        '\u03AD': '\u03B5',
        '\u03AE': '\u03B7',
        '\u03AF': '\u03B9',
        '\u03CA': '\u03B9',
        '\u0390': '\u03B9',
        '\u03CC': '\u03BF',
        '\u03CD': '\u03C5',
        '\u03CB': '\u03C5',
        '\u03B0': '\u03C5',
        '\u03C9': '\u03C9',
        '\u03C2': '\u03C3'
    };

    public static fnOperators: Operators = {
        /**
         * Returns true when the actual input is equal to the given input.
         *
         * @param {string|number|boolean} actual
         * @param {string|number|boolean} expected
         * @param {boolean} ignoreCase?
         * @param {boolean} ignoreAccent?
         * @param ignoreCase
         * @param ignoreAccent
         */
        equal: (actual: string | number | boolean, expected: string | number | boolean, ignoreCase?: boolean,
                ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return DataUtil.toLowerCase(actual) === DataUtil.toLowerCase(expected);
            }
            return actual === expected;
        },
        /**
         * Returns true when the actual input is not equal to the given input.
         *
         * @param {string|number|boolean} actual
         * @param {string|number|boolean} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         * @param ignoreAccent
         */
        notequal: (actual: string | number | boolean, expected: string | number | boolean, ignoreCase?: boolean,
                   ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            return !DataUtil.fnOperators.equal(actual, expected, ignoreCase);
        },
        /**
         * Returns true when the actual input is less than to the given input.
         *
         * @param {string|number|boolean} actual
         * @param {string|number|boolean} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         */
        lessthan: (actual: string | number | boolean, expected: string | number | boolean, ignoreCase?: boolean): boolean => {
            if (ignoreCase) {
                return DataUtil.toLowerCase(actual) < DataUtil.toLowerCase(expected);
            }
            if (isNullOrUndefined(actual)) {
                actual = undefined;
            }
            return actual < expected;
        },
        /**
         * Returns true when the actual input is greater than to the given input.
         *
         * @param {string|number|boolean} actual
         * @param {string|number|boolean} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         */
        greaterthan: (actual: string | number | boolean, expected: string | number | boolean, ignoreCase?: boolean): boolean => {
            if (ignoreCase) {
                return DataUtil.toLowerCase(actual) > DataUtil.toLowerCase(expected);
            }
            return actual > expected;
        },
        /**
         * Returns true when the actual input is less than or equal to the given input.
         *
         * @param {string|number|boolean} actual
         * @param {string|number|boolean} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         */
        lessthanorequal: (actual: string | number | boolean, expected: string | number | boolean, ignoreCase?: boolean): boolean => {
            if (ignoreCase) {
                return DataUtil.toLowerCase(actual) <= DataUtil.toLowerCase(expected);
            }
            if (isNullOrUndefined(actual)) {
                actual = undefined;
            }
            return actual <= expected;
        },
        /**
         * Returns true when the actual input is greater than or equal to the given input.
         *
         * @param {string|number|boolean} actual
         * @param {string|number|boolean} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         */
        greaterthanorequal: (actual: string | number | boolean, expected: string | number | boolean, ignoreCase?: boolean): boolean => {
            if (ignoreCase) {
                return DataUtil.toLowerCase(actual) >= DataUtil.toLowerCase(expected);
            }
            if (isNullOrUndefined(actual)) {
                actual = undefined;
            }
            return actual >= expected;
        },
        /**
         * Returns true when the actual input contains the given string.
         *
         * @param {string|number} actual
         * @param {string|number} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         * @param ignoreAccent
         */
        contains: (actual: string | number, expected: string | number, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return !isNullOrUndefined(actual) && !isNullOrUndefined(expected) &&
                    DataUtil.toLowerCase(actual).indexOf(DataUtil.toLowerCase(expected)) !== -1;
            }
            return !isNullOrUndefined(actual) && !isNullOrUndefined(expected) &&
                actual.toString().indexOf(expected as string) !== -1;
        },
        /**
         * Returns true when the actual input not contains the given string.
         *
         * @param  {string|number} actual
         * @param  {string|number} expected
         * @param  {boolean} ignoreCase?
         */
        doesnotcontain: (actual: string | number, expected: string | number, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return !isNullOrUndefined(actual) && !isNullOrUndefined(expected) &&
                    DataUtil.toLowerCase(actual).indexOf(DataUtil.toLowerCase(expected)) === -1;
            }
            return !isNullOrUndefined(actual) && !isNullOrUndefined(expected) &&
                actual.toString().indexOf(expected as string) === -1;
        },
        /**
         * Returns true when the given input value is not null.
         *
         * @param  {string|number} actual
         * @returns boolean
         */
        isnotnull: (actual: string | number): boolean => {
            return actual !== null && actual !== undefined;
        },
        /**
         * Returns true when the given input value is null.
         *
         * @param  {string|number} actual
         * @returns boolean
         */
        isnull: (actual: string | number): boolean => {
            return actual === null || actual === undefined;
        },
        /**
         * Returns true when the actual input starts with the given string
         *
         * @param {string} actual
         * @param {string} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         * @param ignoreAccent
         */
        startswith: (actual: string, expected: string, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return actual && expected && DataUtil.startsWith(DataUtil.toLowerCase(actual), DataUtil.toLowerCase(expected));
            }
            return actual && expected && DataUtil.startsWith(actual, expected);
        },
        /**
         * Returns true when the actual input not starts with the given string
         *
         * @param  {string} actual
         * @param  {string} expected
         * @param  {boolean} ignoreCase?
         */
        doesnotstartwith: (actual: string, expected: string, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return actual && expected && DataUtil.notStartsWith(DataUtil.toLowerCase(actual), DataUtil.toLowerCase(expected));
            }
            return actual && expected && DataUtil.notStartsWith(actual, expected);
        },
        /**
         * Returns true when the actual input like with the given string.
         *
         * @param  {string} actual
         * @param  {string} expected
         * @param  {boolean} ignoreCase?
         */
        like: (actual: string, expected: string, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return actual && expected && DataUtil.like(DataUtil.toLowerCase(actual), DataUtil.toLowerCase(expected));
            }
            return actual && expected && DataUtil.like(actual, expected);
        },
        /**
         * Returns true when the given input value is empty.
         *
         * @param  {string|number} actual
         * @returns boolean
         */
        isempty: (actual: string): boolean => {
            return actual === undefined || actual === '';
        },
        /**
         * Returns true when the given input value is not empty.
         *
         * @param  {string|number} actual
         * @returns boolean
         */
        isnotempty: (actual: string): boolean => {
            return actual !== undefined && actual !== '';
        },
        /**
         * Returns true when the actual input pattern(wildcard) matches with the given string.
         *
         * @param  {string|Date} actual
         * @param  {string} expected
         * @param  {boolean} ignoreCase?
         */
        wildcard: (actual: string, expected: string, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return (actual || typeof actual === 'boolean') && expected && typeof actual !== 'object' &&
                    DataUtil.wildCard(DataUtil.toLowerCase(actual), DataUtil.toLowerCase(expected));
            }
            return (actual || typeof actual === 'boolean') && expected && DataUtil.wildCard(actual, expected);
        },
        /**
         * Returns true when the actual input ends with the given string.
         *
         * @param {string} actual
         * @param {string} expected
         * @param {boolean} ignoreCase?
         * @param ignoreCase
         * @param ignoreAccent
         */
        endswith: (actual: string, expected: string, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return actual && expected && DataUtil.endsWith(DataUtil.toLowerCase(actual), DataUtil.toLowerCase(expected));
            }
            return actual && expected && DataUtil.endsWith(actual, expected);
        },
        /**
         * Returns true when the actual input not ends with the given string.
         *
         * @param  {string} actual
         * @param  {string} expected
         * @param  {boolean} ignoreCase?
         */
        doesnotendwith: (actual: string, expected: string, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expected = <string>DataUtil.ignoreDiacritics(expected);
            }
            if (ignoreCase) {
                return actual && expected && DataUtil.notEndsWith(DataUtil.toLowerCase(actual), DataUtil.toLowerCase(expected));
            }
            return actual && expected && DataUtil.notEndsWith(actual, expected);
        },
        /**
         * It will return the filter operator based on the filter symbol.
         *
         * @param  {string} operator
         * @hidden
         */
        processSymbols: (operator: string): string => {
            const fnName: string = DataUtil.operatorSymbols[operator];
            if (fnName) {
                const fn: string = DataUtil.fnOperators[fnName];
                return fn;
            }
            return DataUtil.throwError('Query - Process Operator : Invalid operator');
        },
        /**
         * It will return the valid filter operator based on the specified operators.
         *
         * @param  {string} operator
         * @hidden
         */
        processOperator: (operator: string): string => {
            const fn: string = DataUtil.fnOperators[operator];
            if (fn) { return fn; }
            return DataUtil.fnOperators.processSymbols(operator);
        },
        /**
         * Checks if the specified value exists in the given array, with optional case and accent insensitivity.
         *
         * @param {string | number} actual - The value to check.
         * @param {Array<string | number>} expectedArray - The array to search within.
         * @param {boolean} [ignoreCase] - Whether to perform a case-insensitive comparison.
         * @param {boolean} [ignoreAccent] - Whether to ignore accents/diacritics.
         * @returns {boolean} `true` if the value is found, otherwise `false`.
         */
        in: (actual: string | number | Date, expectedArray: Array<string | number | Date>, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expectedArray = <Array<string | number | Date>>DataUtil.ignoreDiacriticsForArrays(expectedArray);
            }
            if (ignoreCase) {
                return !isNullOrUndefined(actual) && expectedArray && expectedArray.length > 0 && expectedArray
                    .map(item => DataUtil.toLowerCase(item)).indexOf(DataUtil.toLowerCase(actual)) > -1;
            }
            if (actual instanceof Date) {
                return !isNullOrUndefined(actual) && expectedArray && expectedArray.length > 0 && Array.isArray(expectedArray) &&
                    expectedArray.some(item => item instanceof Date && (item as Date).getTime() === (actual as Date).getTime());
            }
            return !isNullOrUndefined(actual) && expectedArray && expectedArray.length > 0 && expectedArray.indexOf(actual) > -1;
        },
        /**
         * Checks if the specified value is not present in the given array, with optional case and accent insensitivity.
         *
         * @param {string | number} actual - The value to check.
         * @param {Array<string | number>} expectedArray - The array to search within.
         * @param {boolean} [ignoreCase] - Whether to perform a case-insensitive comparison.
         * @param {boolean} [ignoreAccent] - Whether to ignore accents/diacritics.
         * @returns {boolean} `true` if the value is not found, otherwise `false`.
         */
        notin: (actual: string | number | Date, expectedArray: Array<string | number | Date>, ignoreCase?: boolean, ignoreAccent?: boolean): boolean => {
            if (ignoreAccent) {
                actual = <string>DataUtil.ignoreDiacritics(actual);
                expectedArray = <Array<string | number>>DataUtil.ignoreDiacriticsForArrays(expectedArray);
            }
            if (ignoreCase) {
                return !isNullOrUndefined(actual) && expectedArray && expectedArray.length > 0 && expectedArray
                    .map(item => DataUtil.toLowerCase(item)).indexOf(DataUtil.toLowerCase(actual)) === -1;
            }
            if (actual instanceof Date) {
                return !isNullOrUndefined(actual) && expectedArray && expectedArray.length > 0 && Array.isArray(expectedArray) &&
                    expectedArray.every(item => !(item instanceof Date) || (item as Date).getTime() !== (actual as Date).getTime());
            }
            return !isNullOrUndefined(actual) && expectedArray && expectedArray.length > 0 && expectedArray.indexOf(actual) === -1;
        }
    };

    /**
     * To perform the filter operation with specified adaptor and returns the result.
     *
     * @param {Object} adaptor
     * @param {string} fnName
     * @param {Object} param1?
     * @param {Object} param2?
     * @param param1
     * @param param2
     * @hidden
     */
    public static callAdaptorFunction(adaptor: Object, fnName: string, param1?: Object, param2?: Object): Object {
        if (fnName in adaptor) {
            const res: Query = adaptor[fnName](param1, param2);
            if (!isNullOrUndefined(res)) { param1 = res; }
        }
        return param1;
    }

    public static getAddParams(adp: Object, dm: DataManager, query: Query): Object {
        const req: Object = {};
        DataUtil.callAdaptorFunction(adp, 'addParams', {
            dm: dm,
            query: query,
            params: query ? query.params : [],
            reqParams: req
        });
        return req;
    }
    /**
     * To perform the parse operation on JSON data, like convert to string from JSON or convert to JSON from string.
     */
    public static parse: ParseOption = {
        /**
         * Parse the given string to the plain JavaScript object.
         *
         * @param  {string|Object|Object[]} jsonText
         */
        parseJson: (jsonText: string | Object | Object[]): Object => {
            if (typeof jsonText === 'string' && (/^[\s]*\[|^[\s]*\{(.)+:/g.test(jsonText) || jsonText.indexOf('"') === -1)) {
                jsonText = JSON.parse(<string>jsonText, DataUtil.parse.jsonReviver);
            } else if (jsonText instanceof Array) {
                DataUtil.parse.iterateAndReviveArray(jsonText);
            } else if (typeof jsonText === 'object' && jsonText !== null) {
                DataUtil.parse.iterateAndReviveJson(jsonText);
            }
            return jsonText;
        },
        /**
         * It will perform on array of values.
         *
         * @param  {string[]|Object[]} array
         * @hidden
         */
        iterateAndReviveArray: (array: string[] | Object[]): void => {
            for (let i: number = 0; i < array.length; i++) {
                if (typeof array[i] === 'object' && array[i] !== null) {
                    DataUtil.parse.iterateAndReviveJson(array[i]);
                // eslint-disable-next-line no-useless-escape
                } else if (typeof array[i] === 'string' && (!/^[\s]*\[|^[\s]*\{(.)+:|\"/g.test(<string>array[i]) ||
                    array[i].toString().indexOf('"') === -1)) {
                    array[i] = DataUtil.parse.jsonReviver('', array[i]);
                } else {
                    array[i] = DataUtil.parse.parseJson(array[i]);
                }
            }
        },
        /**
         * It will perform on JSON values
         *
         * @param  {JSON} json
         * @hidden
         */
        iterateAndReviveJson: (json: JSON): void => {
            let value: Object | string;

            const keys: string[] = Object.keys(json);
            for (const prop of keys) {
                if (DataUtil.startsWith(prop, '__')) {
                    continue;
                }

                value = json[prop];
                if (typeof value === 'object') {
                    if (value instanceof Array) {
                        DataUtil.parse.iterateAndReviveArray(value);
                    } else if (value) {
                        DataUtil.parse.iterateAndReviveJson(value);
                    }
                } else {
                    json[prop] = DataUtil.parse.jsonReviver(json[prop], value);
                }
            }
        },
        /**
         * It will perform on JSON values
         *
         * @param  {string} field
         * @param  {string|Date} value
         * @hidden
         */
        jsonReviver: (field: string, value: string | Date): string | Date => {
            if (typeof value === 'string') {
                // eslint-disable-next-line security/detect-unsafe-regex
                const ms: string[] = /^\/Date\(([+-]?[0-9]+)([+-][0-9]{4})?\)\/$/.exec(<string>value);
                const offSet: number = DataUtil.timeZoneHandling ? DataUtil.serverTimezoneOffset : null;
                if (ms) {
                    return DataUtil.dateParse.toTimeZone(new Date(parseInt(ms[1], 10)), offSet, true);
                // eslint-disable-next-line no-useless-escape, security/detect-unsafe-regex
                } else if (/^(\d{4}\-\d\d\-\d\d([tT][\d:\.]*){1})([zZ]|([+\-])(\d\d):?(\d\d))?$/.test(<string>value)) {
                    const isUTC: boolean = value.indexOf('Z') > -1 || value.indexOf('z') > -1;
                    const arr: string[] = (<string>value).split(/[^0-9.]/);
                    if (isUTC) {
                        if (arr[5].indexOf('.') > -1) {
                            const secondsMs: string[] = arr[5].split('.');
                            arr[5] = secondsMs[0];
                            arr[6] = new Date(<string>value).getUTCMilliseconds().toString();
                        } else {
                            arr[6] = '00';
                        }
                        value = DataUtil.dateParse
                            .toTimeZone(new Date(
                                parseInt(arr[0], 10),
                                parseInt(arr[1], 10) - 1,
                                parseInt(arr[2], 10),
                                parseInt(arr[3], 10), parseInt(arr[4], 10), parseInt(arr[5] ? arr[5] : '00', 10), parseInt(arr[6], 10)),
                                        DataUtil.serverTimezoneOffset, false);
                    } else {
                        const utcFormat: Date = new Date(
                            parseInt(arr[0], 10),
                            parseInt(arr[1], 10) - 1,
                            parseInt(arr[2], 10),
                            parseInt(arr[3], 10), parseInt(arr[4], 10), parseInt(arr[5] ? arr[5] : '00', 10));
                        const hrs: number = parseInt(arr[6], 10);
                        const mins: number = parseInt(arr[7], 10);
                        if (isNaN(hrs) && isNaN(mins)) {
                            return utcFormat;
                        }
                        if (value.indexOf('+') > -1) {
                            utcFormat.setHours(utcFormat.getHours() - hrs, utcFormat.getMinutes() - mins);
                        } else {
                            utcFormat.setHours(utcFormat.getHours() + hrs, utcFormat.getMinutes() + mins);
                        }
                        value = DataUtil.dateParse
                            .toTimeZone(utcFormat, DataUtil.serverTimezoneOffset, false);
                    }
                    if (DataUtil.serverTimezoneOffset == null) {
                        value = DataUtil.dateParse.addSelfOffset(value);
                    }
                }
            }
            return value;
        },
        /**
         * Check wheather the given value is JSON or not.
         *
         * @param  {Object[]} jsonData
         */
        isJson: (jsonData: Object[]): Object => {
            if (typeof jsonData[0] === 'string') {
                return jsonData;
            }
            return DataUtil.parse.parseJson(jsonData);
        },
        /**
         * Checks wheather the given value is GUID or not.
         *
         * @param  {string} value
         */
        isGuid: (value: string): boolean => {
            // eslint-disable-next-line security/detect-unsafe-regex
            const regex: RegExp = /[A-Fa-f0-9]{8}(?:-[A-Fa-f0-9]{4}){3}-[A-Fa-f0-9]{12}/i;
            const match: RegExpExecArray = regex.exec(value);
            return match != null;
        },
        /**
         * The method used to replace the value based on the type.
         *
         * @param  {Object} value
         * @param  {boolean} stringify
         * @hidden
         */
        replacer: (value: Object, stringify?: boolean): Object => {

            if (DataUtil.isPlainObject(value)) {
                return DataUtil.parse.jsonReplacer(value, stringify);
            }

            if (value instanceof Array) {
                return DataUtil.parse.arrayReplacer(value);
            }

            if (value instanceof Date) {
                return DataUtil.parse.jsonReplacer({ val: value }, stringify).val;
            }
            return value;
        },
        /**
         * It will replace the JSON value.
         *
         * @param {string} key
         * @param {Object} val
         * @param stringify
         * @hidden
         */
        jsonReplacer: (val: Object, stringify: boolean): Object => {
            let value: Date;
            const keys: string[] = Object.keys(val);
            for (const prop of keys) {
                value = val[prop];

                if (!(value instanceof Date)) {
                    continue;
                }
                let d: Date = value;
                if (DataUtil.serverTimezoneOffset == null) {
                    val[prop] = DataUtil.dateParse.toTimeZone(d, null).toJSON();
                } else {
                    d = new Date(+d + DataUtil.serverTimezoneOffset * 3600000);
                    val[prop] = DataUtil.dateParse.toTimeZone(DataUtil.dateParse.addSelfOffset(d), null).toJSON();
                }
            }

            return val;
        },
        /**
         * It will replace the Array of value.
         *
         * @param  {string} key
         * @param  {Object[]} val
         * @hidden
         */
        arrayReplacer: (val: Object[]): Object => {

            for (let i: number = 0; i < val.length; i++) {
                if (DataUtil.isPlainObject(val[i])) {
                    val[i] = DataUtil.parse.jsonReplacer(val[i]);
                } else if (val[i] instanceof Date) {
                    val[i] = DataUtil.parse.jsonReplacer({ date: val[i] }).date;
                }
            }

            return val;
        },
        /**
         * It will replace the Date object with respective to UTC format value.
         *
         * @param  {string} key
         * @param  {any} value
         * @hidden
         */
        /* eslint-disable @typescript-eslint/no-explicit-any */
        /* tslint:disable-next-line:no-any */
        jsonDateReplacer: (key: string, value: any): any => {
            /* eslint-enable @typescript-eslint/no-explicit-any */
            if (key === 'value' && value) {
                if (typeof value === 'string') {
                    // eslint-disable-next-line security/detect-unsafe-regex
                    const ms: string[] = /^\/Date\(([+-]?[0-9]+)([+-][0-9]{4})?\)\/$/.exec(<string>value);
                    if (ms) {
                        value = DataUtil.dateParse.toTimeZone(new Date(parseInt(ms[1], 10)), null, true);
                    // eslint-disable-next-line no-useless-escape, security/detect-unsafe-regex
                    } else if (/^(\d{4}\-\d\d\-\d\d([tT][\d:\.]*){1})([zZ]|([+\-])(\d\d):?(\d\d))?$/.test(<string>value)) {
                        const arr: string[] = (<string>value).split(/[^0-9]/);
                        value = DataUtil.dateParse
                            .toTimeZone(new Date(
                                parseInt(arr[0], 10),
                                parseInt(arr[1], 10) - 1,
                                parseInt(arr[2], 10),
                                parseInt(arr[3], 10), parseInt(arr[4], 10), parseInt(arr[5], 10)),
                                        null, true);
                    }
                }
                if (value instanceof Date) {
                    value = DataUtil.dateParse.addSelfOffset(value);
                    if (DataUtil.serverTimezoneOffset === null) {
                        return DataUtil.dateParse.toTimeZone(DataUtil.dateParse.addSelfOffset(value), null).toJSON();
                    } else {
                        value = DataUtil.dateParse.toTimeZone(value, ((value.getTimezoneOffset() / 60)
                                                                     - DataUtil.serverTimezoneOffset ),
                                                              false);
                        return value.toJSON();
                    }
                }
            }
            return value;
        }
    };

    /**
     * Checks wheather the given input is a plain object or not.
     *
     * @param  {Object|Object[]} obj
     */
    public static isPlainObject(obj: Object | Object[]): boolean {
        return (!!obj) && (obj.constructor === Object);
    }

    /**
     * Returns true when the browser cross origin request.
     */
    public static isCors(): boolean {
        let xhr: XMLHttpRequest = null;
        const request: string = 'XMLHttpRequest';
        try {
            xhr = new window[request]();
        } catch (e) {
            // No exception handling
        }
        return !!xhr && ('withCredentials' in xhr);
    }
    /**
     * Generate random GUID value which will be prefixed with the given value.
     *
     * @param  {string} prefix
     */
    public static getGuid(prefix: string): string {
        const hexs: string = '0123456789abcdef';
        let rand: number;
        return (prefix || '') + '00000000-0000-4000-0000-000000000000'.replace(/0/g, (val: string, i: number) => {
            if ('crypto' in window && 'getRandomValues' in crypto) {
                const arr: Uint8Array = new Uint8Array(1);
                window.crypto.getRandomValues(arr);
                rand = arr[0] % 16 | 0;
            } else {
                rand = Math.random() * 16 | 0;
            }
            return hexs[i === 19 ? rand & 0x3 | 0x8 : rand];
        });
    }
    /**
     * Checks wheather the given value is null or not.
     *
     * @param  {string|Object} val
     * @returns boolean
     */
    public static isNull(val: string | Object): boolean {
        return val === undefined || val === null;
    }
    /**
     * To get the required items from collection of objects.
     *
     * @param  {Object[]} array
     * @param  {string} field
     * @param  {Function} comparer
     * @returns Object
     * @hidden
     */
    public static getItemFromComparer(array: Object[], field: string, comparer: Function): Object {
        let keyVal: Object;
        let current: Object;
        let key: Object;
        let i: number = 0;
        const castRequired: boolean = typeof DataUtil.getVal(array, 0, field) === 'string';
        if (array.length) {
            while (isNullOrUndefined(keyVal) && i < array.length) {
                keyVal = DataUtil.getVal(array, i, field);
                key = array[i++];
            }
        }
        for (; i < array.length; i++) {
            current = DataUtil.getVal(array, i, field);
            if (isNullOrUndefined(current)) {
                continue;
            }
            if (castRequired) {
                keyVal = +keyVal;
                current = +current;
            }
            if (comparer(keyVal, current) > 0) {
                keyVal = current;
                key = array[i];
            }
        }
        return key;
    }

    /**
     * To get distinct values of Array or Array of Objects.
     *
     * @param {Object[]} json
     * @param {string} field
     * @param fieldName
     * @param {boolean} requiresCompleteRecord
     * @returns Object[]
     * * distinct array of objects is return when requiresCompleteRecord set as true.
     * @hidden
     */
    public static distinct(json: Object[], fieldName: string, requiresCompleteRecord?: boolean): Object[] {
        requiresCompleteRecord = isNullOrUndefined(requiresCompleteRecord) ? false : requiresCompleteRecord;
        const result: Object[] = [];
        let val: string;
        const tmp: Object = {};
        json.forEach((data: Object, index: number) => {
            val = typeof(json[index]) === 'object' ? DataUtil.getVal(json, index, fieldName) as string : json[index] as string;
            if (!(val in tmp)) {
                result.push(!requiresCompleteRecord ? val : json[index]);
                tmp[val] = 1;
            }
        });
        return result;
    }
    /**
     * @hidden
     */
    public static dateParse: DateParseOption = {
        addSelfOffset: (input: Date) => {
            return new Date(+input - (input.getTimezoneOffset() * 60000));
        },
        toUTC: (input: Date) => {
            return new Date(+input + (input.getTimezoneOffset() * 60000));
        },
        toTimeZone: (input: Date, offset?: number, utc?: boolean) => {
            if (offset === null) { return input; }
            const unix: Date = utc ? DataUtil.dateParse.toUTC(input) : input;
            return new Date(+unix - (offset * 3600000));
        },
        toLocalTime: (input: Date) => {
            const datefn: Date = input;
            const timeZone: number = -datefn.getTimezoneOffset();
            const differenceString: string = timeZone >= 0 ? '+' : '-';
            const localtimefn: Function =  (num: number) => {
                const norm: number = Math.floor(Math.abs(num));
                return (norm < 10 ? '0' : '') + norm;
            };
            const val: string = datefn.getFullYear() + '-' + localtimefn(datefn.getMonth() + 1) + '-' + localtimefn(datefn.getDate()) +
            'T' + localtimefn(datefn.getHours()) +
            ':' + localtimefn(datefn.getMinutes()) +
            ':' + localtimefn(datefn.getSeconds()) +
            differenceString + localtimefn(timeZone / 60) +
            ':' + localtimefn(timeZone % 60);
            return val;
        }
    };
    /**
     * Process the given records based on the datamanager string.
     *
     * @param {string} datamanager
     * @param dm
     * @param {Object[]} records
     */
    public static processData(dm: GraphQLParams, records: Object[]): ReturnType {
        const query: Query = this.prepareQuery(dm);
        const sampledata: DataManager = new DataManager(records);
        if (dm.requiresCounts) {
            query.requiresCount();
        }
        /* eslint-disable @typescript-eslint/no-explicit-any */
        // tslint:disable-next-line:no-any
        const result: ReturnType | any = sampledata.executeLocal(query);
        /* eslint-enable @typescript-eslint/no-explicit-any */
        const returnValue: ReturnType = {
            result: dm.requiresCounts ? result.result : result,
            count: result.count,
            aggregates: JSON.stringify(result.aggregates)
        };
        return dm.requiresCounts ? returnValue : result;
    }

    private static prepareQuery(dm: GraphQLParams): Query {
        const query: Query = new Query();

        if (dm.select) {
            query.select(dm.select as string[]);
        }

        if (dm.where) {
            const where: Predicate[] = DataUtil.parse.parseJson(dm.where);
            where.filter((pred: Predicate) => {
                if (isNullOrUndefined(pred.condition)) {
                    query.where(pred.field, pred.operator, (pred.value as string | number | boolean | Date), pred.ignoreCase,
                                pred.ignoreAccent);
                } else {
                    let predicateList: Predicate[] = [];
                    if ((pred as Predicate).field) {
                        predicateList.push(new Predicate(pred.field, pred.operator, pred.value, pred.ignoreCase,
                                                         pred.ignoreAccent));
                    } else {
                        predicateList = predicateList.concat(this.getPredicate(pred.predicates));
                    }
                    if (pred.condition === 'or') {
                        query.where(Predicate.or(predicateList));
                    } else if (pred.condition === 'and') {
                        query.where(Predicate.and(predicateList));
                    }
                }
            });

        }

        if (dm.search) {
            const search: object[] = DataUtil.parse.parseJson(dm.search);
            // tslint:disable-next-line:no-string-literal
            search.filter((e: { key: string, fields: string[] }) => query.search(e.key, e.fields, e['operator'],
                                                                                 // tslint:disable-next-line:no-string-literal
                                                                                 e['ignoreCase'], e['ignoreAccent']));
        }
        if (dm.aggregates) {
            dm.aggregates.filter((e: { type: string, field: string }) => query.aggregate(e.type, e.field));
        }

        if (dm.sorted) {
            dm.sorted.filter((e: { name: string, direction: string }) => query.sortBy(e.name, e.direction));
        }
        if (dm.skip) {
            query.skip(dm.skip);
        }
        if (dm.take) {
            query.take(dm.take);
        }

        if (dm.group) {
            dm.group.filter((grp: string) => query.group(grp));
        }
        return query;
    }

    private static getPredicate(pred: Predicate[]): Predicate[] {
        const mainPred: Predicate[] = [];
        for (let i: number = 0; i < pred.length; i++) {
            const e: Predicate = pred[i];
            if (e.field) {
                mainPred.push(new Predicate(e.field, e.operator, e.value, e.ignoreCase,
                                            e.ignoreAccent));
            } else {
                const childPred: Predicate[] = [];
                // tslint:disable-next-line:typedef
                const cpre = this.getPredicate(e.predicates);
                for (const prop of Object.keys(cpre)) {
                    childPred.push(cpre[prop]);
                }
                mainPred.push(e.condition === 'or' ? Predicate.or(childPred) : Predicate.and(childPred));
            }
        }
        return mainPred;
    }
}

/**
 * @hidden
 */
export interface GraphQLParams {
    skip?: number;
    take?: number;
    sorted?: {name: string, direction: string}[];
    group?: string[];
    table?: string;
    select?: string[];
    where?: string;
    search?: string;
    requiresCounts?: boolean;
    aggregates?: Aggregates[];
    params?: string;
}

/**
 * @hidden
 */
export interface Aggregates {
    sum?: Function;
    average?: Function;
    min?: Function;
    max?: Function;
    truecount?: Function;
    falsecount?: Function;
    count?: Function;
    type?: string;
    field?: string;
}

/**
 * @hidden
 */
export interface Operators {
    equal?: Function;
    notequal?: Function;
    lessthan?: Function;
    greaterthan?: Function;
    lessthanorequal?: Function;
    greaterthanorequal?: Function;
    contains?: Function;
    doesnotcontain?: Function;
    isnotnull?: Function;
    isnull?: Function;
    startswith?: Function;
    doesnotstartwith?: Function;
    like?: Function;
    isempty?: Function;
    isnotempty?: Function;
    wildcard?: Function;
    endswith?: Function;
    doesnotendwith?: Function;
    processSymbols?: Function;
    processOperator?: Function;
    in?: Function;
    notin?: Function;
}

/**
 * @hidden
 */
export interface Group {
    GroupGuid?: string;
    level?: number;
    childLevels?: number;
    records?: Object[];
    key?: string;
    count?: number;
    items?: Object[];
    aggregates?: Object;
    field?: string;
    result?: Object;

}

/**
 * @hidden
 */
export interface ParseOption {
    parseJson?: Function;
    iterateAndReviveArray?: Function;
    iterateAndReviveJson?: Function;
    jsonReviver?: (key: string, value: Object) => Object;
    isJson?: Function;
    isGuid?: Function;
    replacer?: Function;
    jsonReplacer?: Function;
    arrayReplacer?: Function;
    /* eslint-disable @typescript-eslint/no-explicit-any */
    /* tslint:disable-next-line:no-any */
    jsonDateReplacer?: (key: string, value: any) => any;
    /* eslint-enable @typescript-eslint/no-explicit-any */
}
/**
 * @hidden
 */
export interface DateParseOption {
    addSelfOffset?: (input: Date) => Date;
    toUTC?: (input: Date) => Date;
    toTimeZone?: (input: Date, offset?: number, utc?: boolean) => Date;
    toLocalTime?: (input: Date) => string;
}