const UserError = require('vn-loopback/util/user-error');
const {DOMImplementation, XMLSerializer} = require('xmldom');
const moment = require('moment');
const jsbarcode = require('jsbarcode');

module.exports = {
    name: 'item-label-barcode',
    async serverPrefetch() {
        this.company = await this.findOneFromDef('company', [this.warehouseId]);
        if (!this.company)
            throw new UserError(`There is no company associated with that warehouse`);

        this.date = Date.vnNew();
        this.lastBuy = await this.findOneFromDef('lastBuy', [
            this.id,
            this.warehouseId,
            this.date
        ]);
        this.items = await this.rawSqlFromDef('item', [this.copies || 1, this.lastBuy.id]);
        if (!this.items.length) throw new UserError(`Empty data source`);
        this.date = moment(this.date).format('WW/E');
    },
    methods: {
        getBarcode(data) {
            const document = new DOMImplementation().createDocument('http://www.w3.org/1999/xhtml', 'html', null);
            const svgNode = document.createElementNS('http://www.w3.org/2000/svg', 'svg');

            jsbarcode(svgNode, data, {
                xmlDocument: document,
                format: 'code128',
                displayValue: false,
                width: 3.8,
                height: 85,
                margin: 0
            });
            return new XMLSerializer().serializeToString(svgNode);
        }
    },
    props: {
        id: {
            type: Number,
            required: true,
            description: 'The item id'
        },
        warehouseId: {
            type: Number
        },
        packing: {
            type: Number
        },
        copies: {
            type: Number
        },
        userId: {
            type: Number
        }
    }
};