const _ = require('lodash');
const HomebrewModel = require('./homebrew.model.js').model;
const router = require('express').Router();
const zlib = require('zlib');

// const getTopBrews = (cb) => {
// 	HomebrewModel.find().sort({ views: -1 }).limit(5).exec(function(err, brews) {
// 		cb(brews);
// 	});
// };

const getGoodBrewTitle = (text)=>{
	const titlePos = text.indexOf('# ');
	if(titlePos !== -1) {
		const ending = text.indexOf('\n', titlePos);
		return text.substring(titlePos + 2, ending);
	} else {
		return _.find(text.split('\n'), (line)=>line);
	}
};

const newBrew = (req, res)=>{
	const authors = (req.account) ? [req.account.username] : [];

	const newHomebrew = new HomebrewModel(_.merge({},
		req.body,
		{ authors: authors }
	));

	if(!newHomebrew.title) {
		newHomebrew.title = getGoodBrewTitle(newHomebrew.text);
	}

	// Compress brew text to binary before saving
	newHomebrew.textBin = zlib.deflateRawSync(newHomebrew.text);
	// Delete the non-binary text field since it's not needed anymore
	newHomebrew.text = undefined;

	newHomebrew.save((err, obj)=>{
		if(err) {
			console.error(err, err.toString(), err.stack);
			return res.status(500).send(`Error while creating new brew, ${err.toString()}`);
		}
		return res.json(obj);
	});
};

const updateBrew = (req, res)=>{
	HomebrewModel.get({ editId: req.params.id })
		.then((brew)=>{
			brew = _.merge(brew, req.body);
			// Compress brew text to binary before saving
			brew.textBin = zlib.deflateRawSync(req.body.text);
			// Delete the non-binary text field since it's not needed anymore
			brew.text = undefined;
			brew.updatedAt = new Date();

			if(req.account) {
				brew.authors = _.uniq(_.concat(brew.authors, req.account.username));
			}

			brew.markModified('authors');
			brew.markModified('systems');

			brew.save((err, obj)=>{
				if(err) throw err;
				return res.status(200).send(obj);
			});
		})
		.catch((err)=>{
			console.error(err);
			return res.status(500).send('Error while saving');
		});
};

const deleteBrew = (req, res)=>{
	HomebrewModel.find({ editId: req.params.id }, (err, objs)=>{
		if(!objs.length || err) {
			return res.status(404).send('Can not find homebrew with that id');
		}

		const brew = objs[0];

		if(req.account) {
			// Remove current user as author
			brew.authors = _.pull(brew.authors, req.account.username);
			brew.markModified('authors');
		}

		if(brew.authors.length === 0) {
			// Delete brew if there are no authors left
			brew.remove((err)=>{
				if(err) return res.status(500).send('Error while removing');
				return res.status(200).send();
			});
		} else {
			// Otherwise, save the brew with updated author list
			brew.save((err, savedBrew)=>{
				if(err) throw err;
				return res.status(200).send(savedBrew);
			});
		}
	});
};

router.post('/api', newBrew);
router.put('/api/:id', updateBrew);
router.put('/api/update/:id', updateBrew);
router.delete('/api/:id', deleteBrew);
router.get('/api/remove/:id', deleteBrew);

module.exports = router;

/*
module.exports = function(app) {
	app;

	app.get('/api/search', mw.adminOnly, function(req, res) {
		var page = req.query.page || 0;
		var count = req.query.count || 20;

		var query = {};
		if (req.query && req.query.id) {
			query = {
				"$or": [{
					editId : req.query.id
				}, {
					shareId : req.query.id
				}]
			};
		}

		HomebrewModel.find(query, {
			text : 0 //omit the text
		}, {
			skip: page*count,
			limit: count*1
		}, function(err, objs) {
			if (err) console.error(err);
			return res.json({
				page : page,
				count : count,
				total : homebrewTotal,
				brews : objs
			});
		});
	})

	return app;
}
*/