private string CreateProblemsResourceUri(HomePageParameters homePageParameters, ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(Url.Link("GetProblems", new
{
solved = homePageParameters.Solved,
userName = homePageParameters.UserHandle,
tagName = homePageParameters.TagName,
pageNumber = homePageParameters.PageNumber - 1,
pageSize = homePageParameters.PageSize
}));
case ResourceUriType.NextPage:
return(Url.Link("GetProblems", new
{
solved = homePageParameters.Solved,
userName = homePageParameters.UserHandle,
tagName = homePageParameters.TagName,
pageNumber = homePageParameters.PageNumber + 1,
pageSize = homePageParameters.PageSize
}));
default:
return(Url.Link("GetProblems", new
{
solved = homePageParameters.Solved,
userName = homePageParameters.UserHandle,
tagName = homePageParameters.TagName,
pageNumber = homePageParameters.PageNumber,
pageSize = homePageParameters.PageSize
}));
}
}
public PagedList <Problem> GetProblems(HomePageParameters homePageParameters)
{
var collectionBeforePaging = _context.Problems.OrderBy(p => p.Name).AsQueryable();
// filtering by Tag Name
if (!string.IsNullOrEmpty(homePageParameters.TagName))
{
var tagTitle = homePageParameters.TagName.Trim().ToLowerInvariant();
var _tag = _context.Tags.FirstOrDefault(a => a.Title.ToLowerInvariant() == tagTitle);
if (_tag != null)
{
Guid tagId = _tag.Id;
collectionBeforePaging = collectionBeforePaging.Where(a => _context.ProblemTags.Where(b => b.ProblemId == a.Id && b.TagId == tagId).Any());
}
}
// filtering by [solved/not solved]
if (!string.IsNullOrEmpty(homePageParameters.Solved))
{
User user = GetUser(homePageParameters.UserHandle);
if (homePageParameters.Solved.Equals("false"))
{
collectionBeforePaging = collectionBeforePaging.Where(a => _context.UserProblems.Count(b => b.UserId == user.Id && b.ProblemId == a.Id) == 0);
}
else
if (homePageParameters.Solved.Equals("true"))
{
collectionBeforePaging = collectionBeforePaging.Where(a => _context.UserProblems.Count(b => b.UserId == user.Id && b.ProblemId == a.Id) == 1);
}
}
// searching for a specific word
if (!string.IsNullOrEmpty(homePageParameters.Search))
{
var word = homePageParameters.Search.Trim().ToLowerInvariant();
collectionBeforePaging = collectionBeforePaging.Where(a => a.Name.ToLowerInvariant().Contains(word));
}
return(PagedList <Problem> .Create(collectionBeforePaging, homePageParameters.PageNumber, homePageParameters.PageSize));
}
public IActionResult GetProblems(HomePageParameters homePageParameters)
{
var problemsFromRepo = repo.GetProblems(homePageParameters);
var previousPageLink = problemsFromRepo.HasPrevious
? CreateProblemsResourceUri(homePageParameters, ResourceUriType.PreviousPage)
: null;
var nextPageLink = problemsFromRepo.HasNext
? CreateProblemsResourceUri(homePageParameters, ResourceUriType.NextPage)
: null;
var paginationMetaData = new
{
totalCount = problemsFromRepo.TotalCount,
pageSize = problemsFromRepo.PageSize,
currentPage = problemsFromRepo.CurrentPage,
totalPages = problemsFromRepo.TotalPages,
previousPageLink = previousPageLink,
nextPageLink = nextPageLink
};
Response.Headers.Add("X-Pagination",
Newtonsoft.Json.JsonConvert.SerializeObject(paginationMetaData));
var problems = repo.toDto(problemsFromRepo);
if (!string.IsNullOrEmpty(homePageParameters.UserHandle))
{
var user = repo.GetUser(homePageParameters.UserHandle);
if (user != null)
{
foreach (var problem in problems)
{
problem.Solved = repo.IsSolved(user.Id, problem.Id);
}
}
}
return(Ok(new { problems, pagedList = paginationMetaData.totalCount }));
}
