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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using Microsoft.AspNet.SignalR;
using Project_Unite.Models;
namespace Project_Unite
{
public static class NotificationDaemon
{
public static Action<Notification> OnBroadcast;
private static void SendMessage(string uid, string message)
{
GlobalHost
.ConnectionManager
.GetHubContext<NotificationHub>().Clients.User(uid).sendMessage(message);
}
public static void NotifyFollowers(string uid, string title, string desc, string url)
{
var db = new ApplicationDbContext();
var user = db.Users.FirstOrDefault(x => x.Id == uid);
if (user == null)
throw new Exception("Cannot find user with ID " + uid + ".");
foreach(var follower in user.Followers)
{
NotifyUser(uid, follower.Follower, title, desc, url);
}
}
public static void NotifyEveryone(string uid, string title, string desc, string url)
{
var db = new ApplicationDbContext();
var user = db.Users.FirstOrDefault(x => x.Id == uid);
if (user == null)
throw new Exception("Cannot find user with ID " + uid + ".");
foreach (var usr in db.Users.Where(x=>x.Id!=uid).ToArray())
{
NotifyUser(uid, usr.Id, title, desc, url);
}
}
private static string ComposeHtml(Notification note)
{
var builder = new StringBuilder();
builder.AppendLine("<a href=\"" + note.ActionUrl + "\">");
//Avatar holder start:
builder.AppendLine("<div style=\"width:64px;height:64px;display:inline-block;\">");
//Avatar
builder.AppendLine("<img src=\"" + note.AvatarUrl + "\" width=\"64\" height=\"64\"/>");
//Avatar holder end:
builder.AppendLine("</div>");
//Notification title.
builder.AppendLine("<p><strong>" + note.Title + "</strong><br/><br/>");
//Contents.
builder.AppendLine(note.Description + "</p>");
builder.AppendLine("</a>");
return builder.ToString();
}
public static void NotifyUser(string uid, string target, string title, string desc, string url)
{
var db = new ApplicationDbContext();
var user = db.Users.FirstOrDefault(x => x.Id == uid);
if (user == null)
throw new Exception("Cannot find user with ID " + target + ".");
var note = new Notification
{
Id = Guid.NewGuid().ToString(),
UserId = target,
Title = title,
Timestamp = DateTime.Now,
ActionUrl = url,
Description = desc,
AvatarUrl = user.AvatarUrl
};
db.Notifications.Add(note);
db.SaveChanges();
SendMessage(target, ComposeHtml(note));
}
}
}
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