"use strict";

var express = require('express');
var router = express.Router();

var readChunk = require('read-chunk'),
		fileType = require('file-type'),
		Promise = require('bluebird'),
		fs = Promise.promisifyAll(require('fs-extra')),
		path = require('path'),
		_ = require('lodash');

var validPathRe = new RegExp("^([a-z0-9\\/-]+\\.[a-z0-9]+)$");
var validPathThumbsRe = new RegExp("^([0-9]+\\.png)$");

// ==========================================
// SERVE UPLOADS FILES
// ==========================================

router.get('/t/*', (req, res, next) => {

	let fileName = req.params[0];
	if(!validPathThumbsRe.test(fileName)) {
		return res.sendStatus(404).end();
	}

	//todo: Authentication-based access

	res.sendFile(fileName, {
		root: lcdata.getThumbsPath(),
		dotfiles: 'deny'
	}, (err) => {
		if (err) {
			res.status(err.status).end();
		}
	});

});

router.post('/img', lcdata.uploadImgHandler, (req, res, next) => {

	let destFolder = _.chain(req.body.folder).trim().toLower().value();

	upl.validateUploadsFolder(destFolder).then((destFolderPath) => {
		
		if(!destFolderPath) {
			res.json({ ok: false, msg: 'Invalid Folder' });
			return true;
		}

		Promise.map(req.files, (f) => {

			let destFilename = '';
			let destFilePath = '';

			return lcdata.validateUploadsFilename(f.originalname, destFolder).then((fname) => {
				
				destFilename = fname;
				destFilePath = path.resolve(destFolderPath, destFilename);

				return readChunk(f.path, 0, 262);

			}).then((buf) => {

				//-> Check MIME type by magic number

				let mimeInfo = fileType(buf);
				if(!_.includes(['image/png', 'image/jpeg', 'image/gif', 'image/webp'], mimeInfo.mime)) {
					return Promise.reject(new Error('Invalid file type.'));
				}
				return true;

			}).then(() => {

				//-> Move file to final destination

				return fs.moveAsync(f.path, destFilePath, { clobber: false });

			}).then(() => {
				return {
					ok: true,
					filename: destFilename,
					filesize: f.size
				};
			}).reflect();

		}, {concurrency: 3}).then((results) => {
			let uplResults = _.map(results, (r) => {
				if(r.isFulfilled()) {
					return r.value();
				} else {
					return {
						ok: false,
						msg: r.reason().message
					};
				}
			});
			res.json({ ok: true, results: uplResults });
			return true;
		}).catch((err) => {
			res.json({ ok: false, msg: err.message });
			return true;
		});

	});

});

router.get('/*', (req, res, next) => {

	let fileName = req.params[0];
	if(!validPathRe.test(fileName)) {
		return res.sendStatus(404).end();
	}

	//todo: Authentication-based access

	res.sendFile(fileName, {
		root: git.getRepoPath() + '/uploads/',
		dotfiles: 'deny'
	}, (err) => {
		if (err) {
			res.status(err.status).end();
		}
	});

});

module.exports = router;