var router = require('express').Router(),
    mongoose = require('mongoose'),
    Metal = mongoose.model('Metal');
const auth = require('../auth');

// Preload metal objects on routes with ':code'
router.param('code', function (req, res, next, code) {
    Metal.findOne({ code: code })
        .then(function (metal) {
            if (!metal) {
                return res.sendStatus(404);
            }
            req.metal = metal;
            return next();
        }).catch(next);
});

router.get('/', auth.required, function (req, res, next) {
    var query = {};
    var limit = 20;
    var offset = 0;
    if (typeof req.query.limit !== 'undefined') {
        limit = req.query.limit;
    }
    if (typeof req.query.offset !== 'undefined') {
        offset = req.query.offset;
    }
    if (typeof req.query.code !== 'undefined') {
        query.code = req.query.code;
    }
    if (typeof req.query.color !== 'undefined') {
        query.color = req.query.color;
    }
    if (typeof req.query.ordering !== 'undefined') {
        query.ordering = req.query.ordering;
    }
    if (typeof req.query.title !== 'undefined') {
        query.title = req.query.title;
    }
    Promise.all([
        Metal.find(query)
            .limit(Number(limit))
            .skip(Number(offset))
            .exec(),
        Metal.count(query).exec()
    ]).then(function (results) {
        var metals = results[0];
        var metalsCount = results[1];

        return res.json({
            metals: metals.map(function (metal) {
                return metal.toJSONFor();
            }),
            metalsCount: metalsCount
        });
    }).catch(next);
});

// return a metal
router.get('/:code', auth.required, function (req, res, next) {
    return res.json({ metal: req.metal.toJSONFor() });
});

module.exports = router;