public Task<Stat> Click(string segment, string referer, string ip)
{
return Task.Run(() =>
{
using (var ctx = new ShorturlContext())
{
ShortUrl url = ctx.ShortUrls.Where(u => u.Segment == segment).FirstOrDefault();
if (url == null)
{
throw new ShorturlNotFoundException();
}
url.NumOfClicks = url.NumOfClicks + 1;
Stat stat = new Stat()
{
ClickDate = DateTime.Now,
Ip = ip,
Referer = referer,
ShortUrl = url
};
ctx.Stats.Add(stat);
ctx.SaveChanges();
return stat;
}
});
}
public Task<ShortUrl> ShortenUrl(string longUrl, string ip, string segment = "")
{
return Task.Run(() =>
{
using (var ctx = new ShorturlContext())
{
ShortUrl url;
url = ctx.ShortUrls.Where(u => u.LongUrl == longUrl).FirstOrDefault();
if (url != null)
{
return url;
}
if (!string.IsNullOrEmpty(segment))
{
if (ctx.ShortUrls.Where(u => u.Segment == segment).Any())
{
throw new ShorturlConflictException();
}
}
else
{
segment = this.NewSegment();
}
if (string.IsNullOrEmpty(segment))
{
throw new ArgumentException("Segment is empty");
}
url = new ShortUrl()
{
Added = DateTime.Now,
Ip = ip,
LongUrl = longUrl,
NumOfClicks = 0,
Segment = segment
};
ctx.ShortUrls.Add(url);
ctx.SaveChanges();
return url;
}
});
}
private string NewSegment()
{
using (var ctx = new ShorturlContext())
{
int i = 0;
while (true)
{
string segment = Guid.NewGuid().ToString().Substring(0, 6);
if (!ctx.ShortUrls.Where(u => u.Segment == segment).Any())
{
return segment;
}
if (i > 30)
{
break;
}
i++;
}
return string.Empty;
}
}
