const UserError = require('vn-loopback/util/user-error');
const moment = require('moment');
const qrcode = require('qrcode');

module.exports = {
    name: 'item-label-qr',
    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.qr = await this.getQr(this.items[0].buyFk);
        this.date = moment(this.date).format('WW/E');
    },
    methods: {
        getQr(data) {
            data = {
                company: this.company,
                user: this.userId,
                created: this.date,
                table: 'buy',
                id: data
            };
            return qrcode.toDataURL(JSON.stringify(data), {
                margin: 0,
                errorCorrectionLevel: 'L'
            });
        }
    },
    props: {
        id: {
            type: Number,
            required: true,
            description: 'The item id'
        },
        warehouseId: {
            type: Number
        },
        packing: {
            type: Number
        },
        copies: {
            type: Number
        },
        userId: {
            type: Number
        }
    }
};