public IEnumerable <Recommendation> RecommendQuery(RecommendQuery query)
{
var account = AccountContext.Accounts.FirstOrDefault(s => s.Id == query.AccountId);
if (account == null)
{
return(null);
}
IQueryable <Account> accountsQuery = AccountContext.Accounts;//.FromSql("");
accountsQuery = AddQueryItems(accountsQuery, query);
accountsQuery = accountsQuery.Where(s => s.Sex != account.Sex);
var now = SecondEpochConverter.ConvertTo(DateTime.UtcNow);
var recommendation = accountsQuery.Select(a => new
{
Account = a,
Premium = ((a.PremiumStart ?? long.MaxValue) <= now && ((a.PremiumFinish ?? 0) >= now)) ? 1000000000 : 0,
Status = GetStatusCount(a.Status),
Interests = InterestsComp(a.Interests, account.Interests),
AgeDif = Math.Abs((account.Birth - a.Birth).TotalSeconds)
})
.Where(r => r.Interests > 0)
.OrderByDescending(r => r.Premium)
.ThenByDescending(r => r.Status)
.ThenByDescending(r => r.Interests)
.ThenBy(r => r.AgeDif)
.ThenBy(r => r.Account.Id)
.Select(r => new Recommendation(r.Account))
.Take(query.Limit);
return(recommendation);
}
private IQueryable <Account> AddPremiumQuery(IQueryable <Account> accounts, QueryItem queryItem)
{
switch (queryItem.Predicate)
{
case Predicate.@null:
if (queryItem.Value == "1")
{
return(accounts.Where(a => a.PremiumStart == null));
}
if (queryItem.Value == "0")
{
return(accounts.Where(a => a.PremiumStart != null));
}
throw new Exception($"Wrong value {queryItem.Value}");
case Predicate.now:
var now = SecondEpochConverter.ConvertTo(DateTime.UtcNow);
return(accounts.Where(a => a.PremiumStart != null && a.PremiumFinish != null && a.PremiumStart <= now && a.PremiumFinish >= now));
default:
throw new Exception($"Unsupportend predicate {queryItem.Predicate}");
}
}