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

module.exports = Self => {
    Self.remoteMethodCtx('allocatePDA', {
        description: 'Deallocate the PDA of the worker',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'The worker id',
            http: {source: 'path'}
        }, {
            arg: 'pda',
            type: 'number',
            required: true,
            description: 'The pda id'
        }],
        returns: {
            type: ['object'],
            root: true
        },
        http: {
            path: `/:id/allocatePDA`,
            verb: 'POST'
        }
    });

    Self.allocatePDA = async(ctx, options) => {
        const models = Self.app.models;
        const args = ctx.args;
        let tx;
        const myOptions = {};

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

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

        try {
            const pda = await models.DeviceProduction.findById(args.pda, myOptions);
            if (pda.stateFk != 'idle') throw new UserError(`The PDA state is not idle`);
            await pda.updateAttributes({stateFk: 'active'}, myOptions);
            await models.DeviceProductionUser.create({
                deviceProductionFk: args.pda,
                userFk: args.id,
                created: new Date()
            }, myOptions);

            if (tx) await tx.commit();

            return {
                deviceProductionFk: pda.id,
                deviceProduction: {
                    modelFk: pda.modelFk,
                    serialNumber: pda.serialNumber
                }
            };
        } catch (e) {
            if (tx) await tx.rollback();
            throw e;
        }
    };
};