public IEnumerable <Book> SearchBooks(string query, string order, string direction)
{
List <string> parts = query.ToLower().Split('+', StringSplitOptions.RemoveEmptyEntries).ToList();
Dictionary <Book, int> Relevance;
if (parts.Count > 0)
{
var partsWithDashes = parts.Where(x => x.Contains('-'));
var noDashParts = partsWithDashes.Select(x => x.Replace("-", "")).ToList();
if (noDashParts.Count > 0)
{
parts.AddRange(noDashParts);
}
Relevance = new Dictionary <Book, int>();
foreach (var part in parts)
{
var bookWithKeyword = _context.Books
.Where(p => $"{p.Name} {p.Edition} {p.Author} {p.ISBN10} {p.ISBN13}"
.Contains(part, StringComparison.InvariantCultureIgnoreCase));
foreach (var book in bookWithKeyword)
{
if (Relevance.ContainsKey(book))
{
Relevance[book]++;
}
else
{
Relevance.Add(book, 1);
}
}
}
}
else
{
Relevance = _context.Books.ToDictionary(x => x, x => 1);
}
foreach (var book in Relevance)
{
if (book.Key.User == null)
{
book.Key.User = GetUser(book.Key.UserId, false);
}
}
switch (order)
{
case "relevance":
if (direction == "asc")
{
return(Relevance.OrderByDescending(x => x.Value).Select(x => x.Key));
}
else if (direction == "desc")
{
return(Relevance.OrderBy(x => x.Value).Select(x => x.Key));
}
break;
case "price":
if (direction == "asc")
{
return(Relevance.OrderBy(x => x.Key.Price).Select(x => x.Key));
}
else if (direction == "desc")
{
return(Relevance.OrderByDescending(x => x.Key.Price).Select(x => x.Key));
}
break;
case "name":
if (direction == "asc")
{
return(Relevance.OrderBy(x => x.Key.Name).Select(x => x.Key));
}
else if (direction == "desc")
{
return(Relevance.OrderByDescending(x => x.Key.Name).Select(x => x.Key));
}
break;
}
return(new List <Book>());
}