var Uploader = {

    roomId: null,
    
    createRoom: function(callback) {
	var self = this;
	$.post('/room', {}, function(response) {
	    callback($.parseJSON(response).id);
	})
    },

    getRoom: function(callback) {
	$.getJSON('/room/'+this.roomId, callback)
    },

    getFile: function(fileName, callback) {
	var xhr = new XMLHttpRequest();
	xhr.open('GET', '/room/'+this.roomId+'/'+encodeURIComponent(fileName), true);
	xhr.responseType = 'arraybuffer';
	xhr.onload = callback;
	xhr.send();
    },
    
    deleteRoom: function() {
	$.ajax({
	    type: 'DELETE',
	    url: '/room/'+this.roomId
	})
    },

    uploadFile: function(name, data){
	var formData = new FormData();
	formData.append("file", data, name);
	$.ajax({
	    url: '/room/'+this.roomId,
            data: formData,	    
            cache: false,
            processData: false,
            contentType: false,
            xhr: function () {
                var xhr = new XMLHttpRequest()
                //xhr.upload.addEventListener('progress', progress, false)
                return xhr
            },
            type: 'POST'
	});
    },
    
    deleteFile: function() {
	console.log('NOPE');
    },
}

var CryptoUploader = {
 
    createRoom: function() {
	Uploader.createRoom(function(roomId){
	    CryptoUtils.initialize()
		.then(function(){
		    window.location = window.location.href+"#"+roomId+","+CryptoUtils.urlSafeKey;
		    window.location.reload();
		})
	});
    },
    
    uploadFile: function() {
	var fileReader = new FileReader();
	var data;
	var file = document.getElementById("file-selector").files[0];
	var self = this;
	fileReader.onload = function(e) {
	    this.data = fileReader.result;
	    CryptoUtils.encrypt(this.data)
		.then(function(encrypted){
		    Uploader.uploadFile(file.name, encrypted);
		    self.showRoomContent();
		}).catch(function(err){
		    console.error(err);
		});
	};
	fileReader.readAsArrayBuffer(file);
    },

    downloadFile: function(fileName) {
	Uploader.getFile(fileName, function(e){
	    if(this.status == 200) {
		CryptoUtils.decrypt(this.response).
		    then(function(decrypted){
			var a = document.createElement("a");
			document.body.appendChild(a);
			a.style = "display: none";
			blob = new Blob([decrypted], {type: "application/octet-binary"}),
			url = window.URL.createObjectURL(blob);
			a.href = url;
			a.download = fileName;
			a.click();
			window.URL.revokeObjectURL(url);
		    }).catch(function(err){
			console.error(err);
		    })
	    }
	})
    },

    showRoomContent: function() {
	$("#file-list > ul").empty();
	Uploader.getRoom(function(data){
	    for(let f of data.entries()) {
		$("<li><a>"+f[1]+"</a></li>")
		    .appendTo("#file-list > ul")
		    .on('click', function(e){CryptoUploader.downloadFile(e.target.text)});
	    }
	})
    }
}

$(function(){
    if(window.location.hash) {
	var params = window.location.hash.substr(1).split(',');
	var roomId = params.shift();
	var key = params.shift();
	var file = params.shift();
	$("#create-room").hide();
	$("#room").show();
	Uploader.roomId = roomId;
	CryptoUtils.initialize(key).then(function(){
	    $("#woot").on('click', function(){
		CryptoUploader.uploadFile();
	    });
	    CryptoUploader.showRoomContent();
	    if(file !== undefined) {
		CryptoUploader.downloadFile(file);
	    }
	}).catch(function(err){
	    console.error(err);
	});
    }
    else {
	$("#room").hide();
	$("#create-room > input").show().on('click', function(e){
	    CryptoUploader.createRoom();
	});
    }
})