'use strict';

const zlib = require('zlib');
const crypto = require("crypto");

const js2xmlparser = require('js2xmlparser');

const GenericOrder = require('./GenericOrder');

module.exports = class GenericUploadOrder extends GenericOrder {
	constructor(client, document) {
		super(client);

		this._document    = document;
		this._key         = crypto.randomBytes(16);

		this._schema.body = {
			DataTransfer: {
				DataEncryptionInfo: {
					"@": { authenticate: true },
					EncryptionPubKeyDigest: {
						"@": { Version: "E002", Algorithm: "http://www.w3.org/2001/04/xmlenc#sha256" },
						"#": this.client.bankE().publicDigest()
					},
					TransactionKey: this.client.bankE().publicEncrypt(this._key).toString('base64'),
				},
				SignatureData: {
					"@": { authenticate: true },
					"#": this.encryptedOrderSignature()
				}
			}
		};
	};

	orderSignature() {
		const xmlObj = {
			"@": {
				xmlns: "http://www.ebics.org/S001",
				"xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
				"xsi:schemaLocation": "http://www.ebics.org/S001 http://www.ebics.org/S001/ebics_signature.xsd"
			},
			OrderSignatureData: {
				SignatureVersion: "A006",
				SignatureValue: this.signatureValue(),
				PartnerID: this.partnerId,
				UserID: this.userId
			}
		};

		return js2xmlparser.parse('UserSignatureData', xmlObj, this.xmlOptions);
	};

	signatureValue() {
		const digested = crypto.createHash('sha256').update(this._document.replace(/\n|\r/g, "")).digest();

		return this.client.a().sign(digested);
	};

	encryptedOrderData() {
		const dst = zlib.deflateSync(this._document.replace(/\r|\n/g, ""));
		const cipher = crypto.createCipheriv('aes-128-cbc', this._key, Buffer.from([0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,])).setAutoPadding(false);

		return Buffer.concat([cipher.update(this._pad(dst)), cipher.final()]).toString('base64');
	}

		encryptedOrderSignature() {
		const dst    = zlib.deflateSync(this.orderSignature());
		const cipher = crypto.createCipheriv('aes-128-cbc', this._key, Buffer.from([0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,])).setAutoPadding(false);

		return Buffer.concat([cipher.update(this._pad(dst)), cipher.final()]).toString('base64');
	};

	_pad(d) {
		const dLen = d.length;
		const len = 16 * ( Math.trunc(dLen / 16) + 1 );

		return Buffer.concat([d, Buffer.from(Buffer.from([0]).toString().repeat(len - dLen - 1)), Buffer.from([len-dLen])]);
	}
};