let UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethodCtx('confirm', {
        description: '',
        accessType: 'WRITE',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'The request ID',
        }, {
            arg: 'itemFk',
            type: 'number',
            required: true,
            description: 'The requested item ID',
        }, {
            arg: 'quantity',
            type: 'number',
            required: true,
            description: 'The requested item quantity',
        }],
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/:id/confirm`,
            verb: 'post'
        }
    });

    Self.confirm = async(ctx, options) => {
        const userId = ctx.req.accessToken.userId;
        const models = Self.app.models;
        const $t = ctx.req.__; // $translate
        const myOptions = {userId};
        let tx;

        if (typeof options == 'object')
            Object.assign(myOptions, options);

        if (!myOptions.transaction) {
            tx = await Self.beginTransaction({});
            myOptions.transaction = tx;
        }

        try {
            const item = await models.Item.findById(ctx.args.itemFk, null, myOptions);
            if (!item)
                throw new UserError(`That item doesn't exists`);

            const request = await models.TicketRequest.findById(ctx.args.id, {
                include: {relation: 'ticket'}
            }, myOptions);

            const itemStock = await models.Item.getVisibleAvailable(
                ctx.args.itemFk,
                request.ticket().warehouseFk,
                request.ticket().shipped,
                myOptions
            );

            const isAvailable = itemStock.available > 0;

            if (!isAvailable)
                throw new UserError(`This item is not available`);

            if (request.saleFk)
                throw new UserError(`This request already contains a sale`);

            const sale = await models.Sale.create({
                ticketFk: request.ticketFk,
                itemFk: ctx.args.itemFk,
                quantity: ctx.args.quantity,
                concept: item.name
            }, myOptions);
            await request.updateAttributes({
                saleFk: sale.id,
                itemFk: sale.itemFk,
                isOk: true
            }, myOptions);

            const query = `CALL vn.sale_calculateComponent(?, NULL)`;
            await Self.rawSql(query, [sale.id], myOptions);

            const origin = ctx.req.headers.origin;
            const requesterId = request.requesterFk;

            const message = $t('Bought units from buy request', {
                quantity: sale.quantity,
                concept: sale.concept,
                itemId: sale.itemFk,
                ticketId: sale.ticketFk,
                url: `${origin}/#!/ticket/${sale.ticketFk}/summary`,
                urlItem: `${origin}/#!/item/${sale.itemFk}/summary`
            });
            await models.Chat.sendCheckingPresence(ctx, requesterId, message, myOptions);

            if (tx) await tx.commit();

            return sale;
        } catch (e) {
            if (tx) await tx.rollback();
            throw e;
        }
    };
};