public async Task <ActionResult <IEnumerable <ReadBookDto> > > Get([FromQuery(Name = "filter")] Filter[] filter)
{
//api/books?filter=[{"property":"genres","value":"Poetry"},{"property":"publicationYear","value":"1993"}]
string author = null;
string title = null;
int? publicationYear = null;
Bookbindings bookbinding = Bookbindings.NotSet;
AgeCategories ageCategorie = AgeCategories.NotSet;
List <Genres> genres = null;
foreach (var f in filter)
{
switch (f.property)
{
case "author":
author = string.IsNullOrWhiteSpace(f.value) ? null : f.value;
break;
case "title":
title = string.IsNullOrWhiteSpace(f.value) ? null : f.value;
break;
case "publicationYear":
publicationYear = int.TryParse(f.value, out var tmpPublicationYear) ? (int?)tmpPublicationYear : null;
break;
case "bookbinding":
if (!string.IsNullOrWhiteSpace(f.value))
{
if (Enum.TryParse(f.value, true, out Bookbindings newBookbinding))
{
bookbinding = newBookbinding;
}
}
break;
case "ageCategorie":
if (!string.IsNullOrWhiteSpace(f.value))
{
if (Enum.TryParse(f.value, true, out AgeCategories newAgeCategorie))
{
ageCategorie = newAgeCategorie;
}
}
break;
case "genres":
if (!string.IsNullOrWhiteSpace(f.value))
{
genres = new List <Genres>();
foreach (var v in f.value.Split(','))
{
if (Enum.TryParse(v, true, out Genres genre))
{
genres.Add(genre);
}
}
}
break;
}
}
if (string.IsNullOrEmpty(author) && string.IsNullOrEmpty(title) && !publicationYear.HasValue && bookbinding == Bookbindings.NotSet && genres == null && ageCategorie == AgeCategories.NotSet)
{
var books = await _bookService.GetAllBooks();
var readBooks = _mapper.Map <IEnumerable <Book>, IEnumerable <ReadBookDto> >(books);
return(Ok(readBooks));
}
else
{
var criteria = GetCriteria(author, title, publicationYear, bookbinding, ageCategorie, genres);
var books = _bookService.FindBooks(criteria).AsEnumerable();
var readBooks = _mapper.Map <IEnumerable <Book>, IEnumerable <ReadBookDto> >(books);
return(Ok(readBooks));
}
}
private static Expression <Func <Book, bool> > GetCriteria(string author, string title, int?publicationYear, Bookbindings bookbinding, AgeCategories ageCategorie, List <Genres> genres)
{
Expression <Func <Book, bool> > criteria = book =>
(string.IsNullOrEmpty(author) || book.Author.Contains(author)) &&
(string.IsNullOrEmpty(title) || book.Title.Contains(title)) &&
(!publicationYear.HasValue || book.PublicationYear.Equals(publicationYear)) &&
(bookbinding.HasFlag(Bookbindings.NotSet) || book.Bookbinding.HasFlag(bookbinding))
//&& (genres == null || book.Genres.Contains(genres[0]))
//&& (genres == null || genres.All(g => book.Genres.Any(x => x.HasFlag(g))))
//&& (genres == null || book.Genres.All(g => genres.))
&& (ageCategorie.HasFlag(AgeCategories.NotSet) || book.AgeCategorie.HasFlag(ageCategorie));
return(criteria);
}
