const database = require(`${appPath}/lib/database`);
const UserException = require(`${appPath}/lib/exceptions/userException`);
const strftime = require('strftime');
const qrcode = require('qrcode');

module.exports = {
    name: 'rpt-item-label',
    async asyncData(ctx, params) {
        Object.assign(this, this.methods);

        if (!params.itemId)
            throw new UserException('No item id specified');

        if (!params.warehouseId)
            throw new UserException('No warehouse id specified');

        const data = {
            item: await this.fetchItem(params.itemId, params.warehouseId),
            tags: await this.fetchItemTags(params.itemId),
            barcode: await this.getBarcodeBase64(params.itemId),
            labelNumber: params.labelNumber,
            totalLabels: params.totalLabels
        };

        return data;
    },
    computed: {
        dated() {
            return strftime('%W/%d', new Date());
        }
    },
    methods: {
        fetchItem(id, warehouseId) {
            return database.pool.query(
                `SELECT 
                    i.id, 
                    i.name,
                    i.stems, 
                    i.size,
                    b.packing
                FROM vn.item i
                    JOIN cache.last_buy clb ON clb.item_id = i.id
                    JOIN vn.buy b ON b.id = clb.buy_id
                    JOIN vn.entry e ON e.id = b.entryFk
                WHERE i.id = ? AND clb.warehouse_id = ?`, [id, warehouseId])
                .then(([rows]) => {
                    if (rows.length == 0)
                        throw new UserException(`Item #${id} not found on warehouse #${warehouseId}`);
                    return rows[0];
                });
        },
        fetchItemTags(itemId) {
            return database.pool.query(
                `SELECT t.code, t.name, it.value
                    FROM vn.itemTag it
                        JOIN vn.tag t ON t.id = it.tagFk
                    WHERE it.itemFk = ?`, [itemId])
                .then(([rows]) => {
                    const tags = {};
                    rows.forEach(row => tags[row.code] = row.value);

                    return tags;
                });
        },
        getBarcodeBase64(itemId) {
            return qrcode.toDataURL(itemId, {margin: 0});
        },
        packing() {
            const stems = this.item.stems ? this.item.stems : 1;
            return `${this.item.packing}x${stems}`;
        },
        labelPage() {
            const labelNumber = this.labelNumber ? this.labelNumber : 1;
            const totalLabels = this.totalLabels ? this.totalLabels : 1;

            return `${labelNumber}/${totalLabels}`;
        }
    },
    components: {
        'report-header': require('../report-header'),
        'report-footer': require('../report-footer'),
    },
};