var fs = require('fs')
var	knox = require('knox')
var uuid = require('node-uuid')
var crypto = require('crypto')

var s3

var acceptableuploadTypes = {
	'image/gif': 'gif',
	'image/jpeg': 'jpg',
	'image/jpg': 'jpg',
	'image/png': 'png',
	'application/pdf': 'pdf',
}

module.exports = {}

module.exports.init = function (opt){
	if (opt.local) {
		s3 = { local: opt.local }
	} else {	
	  s3 = knox.createClient({
	    key: opt.key,
	    secret: opt.secret,
	    bucket: opt.bucket,
	  })
	}
}

module.exports.put = function (opt) {
	var filename
	var err
	var now = new Date()

	var file = opt.file
	// console.log("Received", file.originalname, file.mimetype)

  var types = opt.types || acceptableuploadTypes
	var extension = types[file.mimetype]

	if (opt.filename) {
	  filename = opt.filename
	}
	else if (opt.preserveFilename) {
	  filename = file.originalname
	}
	else {
    filename = uuid.v1() + "." + extension;
	}

	var remote_path = "/" + opt.dirname + "/" + filename

	if (! extension) {
		err = "Unacceptable filetype."
	}
	else if (opt.maxSize && file.size > opt.maxSize) {
		err = "File too large. Uploads can be a maximum of " + opt.maxSize + " bytes."
	}

	if (err) {
		console.error(">>>", err)
		opt.unacceptable && opt.unacceptable(err)
		return
	}

	opt.acceptable && opt.acceptable(err)
	
	// console.log("upload >", remote_path)
	if (s3.local) {
		var hash = crypto.createHash("sha256").update(filename, "utf8").digest("hex")
		var hash_path = hash.substr(0, 2)
		fs.mkdir(s3.local.localPath + hash_path, function(error){
			if (error && error.code !== "EEXIST") {
				console.error("error creating directory")
				console.error(error)
				opt.unacceptable && opt.unacceptable(error)
				return
			}
			var localPath = (s3.local.localPath + hash_path + "/" + filename).replace(/\/\//g, "/")
			var remotePath = (s3.local.remotePath + hash_path + "/" + filename).replace(/\/\//g, "/")
	    fs.writeFile(localPath, file.buffer, {}, function(error){
				if (error) {
					console.error("error saving file")
					console.error(error)
					opt.unacceptable && opt.unacceptable(error)
					return
				}
				opt.success && opt.success(remotePath)
	    });
		})
	} else {
		s3.putBuffer(file.buffer, remote_path, {
			'Content-Length': file.size,
			'Content-Type': file.mimetype,
			'x-amz-acl': 'public-read'
		}, function(err, s3res) {
			if (err || s3res.statusCode !== 200) {
				console.error(err);
				if (s3res && s3res.resume) {
					s3res.resume()
				}
				return;
			}

			var file_url = s3res.url || s3res.req.url		

			opt.success && opt.success(file_url)
		}).on('error', function(err, s3res){
			console.error(err)
			s3res && s3res.resume && s3res.resume()
		})
	}
}