import * as esprima from 'esprima';

import { INode } from "../../interfaces/nodes/INode";
import { IOptions } from "../../interfaces/IOptions";

import { TBlockScopeNode } from "../../types/TBlockScopeNode";

import { AppendState } from "../../enums/AppendState";
import { JSFuck } from "../../enums/JSFuck";

import { NO_CUSTOM_NODES_PRESET } from "../../preset-options/NoCustomNodesPreset";

import { JavaScriptObfuscator } from "../../JavaScriptObfuscator";
import { Node } from '../Node';
import { NodeUtils } from "../../NodeUtils";
import { Utils } from "../../Utils";

export class SelfDefendingUnicodeNode extends Node {
    /**
     * @type {AppendState}
     */
    protected appendState: AppendState = AppendState.AfterObfuscation;

    /**
     * @param options
     */
    constructor (options: IOptions = {}) {
        super(options);

        this.node = this.getNodeStructure();
    }

    /**
     * @param blockScopeNode
     */
    public appendNode (blockScopeNode: TBlockScopeNode): void {
        let programBodyLength: number = blockScopeNode.body.length,
            randomIndex: number = 0;

        if (programBodyLength > 2) {
            randomIndex = Utils.getRandomInteger(programBodyLength / 2, programBodyLength - 1);
        }

        NodeUtils.insertNodeAtIndex(blockScopeNode.body, this.getNode(), randomIndex);
    }

    /**
     * @returns {INode}
     */
    protected getNodeStructure (): INode {
        let node: INode = esprima.parse(
            JavaScriptObfuscator.obfuscate(`
                (function () {                                
                    var func = function(){return ${Utils.stringToUnicode('dev')};},
                        func2 = function () {
                            return 'window';
                        };
                
                    !Function(${Utils.stringToUnicode(`return/\\w+ *\\(\\) *{\\w+ *['|"].+['|"];? *}/`)})().test(func.toString()) ? Function(${Utils.stringToUnicode(`return/(\\\\[x|u](\\w){2,4})+/`)})().test(func2.toString()) ? []['filter']['constructor'](${Utils.stringToJSFuck('while')} + '(${JSFuck.False}){}')() : []['filter']['constructor'](${Utils.stringToJSFuck('while')} + '(${JSFuck.True}){}')() : []['filter']['constructor'](${Utils.stringToJSFuck('while')} + '(${JSFuck.False}){}')();
                })();
            `, NO_CUSTOM_NODES_PRESET)
        );

        NodeUtils.addXVerbatimPropertyToLiterals(node);

        return NodeUtils.getBlockScopeNodeByIndex(node);
    }
}