/// <summary>
/// Initializes a new instance of the search.
/// </summary>
/// <param name="linkGenerator">Represents the link generator.</param>
/// <param name="httpContext">Represents the current HTTP context.</param>
/// <param name="input">Represents the input parameters.</param>
/// <param name="query">Represents the query agains which to perform the search.</param>
public SearchViewModel(LinkGenerator linkGenerator, HttpContext httpContext, SearchInputViewModel input, IQueryable <T> query)
{
// Define the input.
Input = input;
// Get the pagination.
Pagination = new SearchPaginationViewModel(linkGenerator, httpContext, Input, query.Count());
// Define the current searches and filters.
Filters = new List <SearchFilterViewModel>();
// Check if there is any search applied.
if (Input.SearchIn.Any())
{
// Go over each of the search locations.
foreach (var value in Input.SearchIn)
{
// Add a corresponding new filter.
Filters.Add(new SearchFilterViewModel
{
Text = $"Search: \"{Input.SearchString}\" in {Input.Options.SearchIn[value]}",
Link = linkGenerator.GetPathByRouteValues(httpContext: httpContext, routeName: null, values: new { id = Input.Id, searchString = Input.SearchIn.Count() == 1 ? string.Empty : Input.SearchString, searchIn = Input.SearchIn.Where(item => item != value), filter = Input.Filter, sortBy = Input.SortBy, sortDirection = Input.SortDirection, itemsPerPage = Input.ItemsPerPage, currentPage = 1 }),
Type = "SearchIn"
});
}
// Add a new filter for all search locations.
Filters.Add(new SearchFilterViewModel
{
Text = "Search: Clear all",
Link = linkGenerator.GetPathByRouteValues(httpContext: httpContext, routeName: null, values: new { id = Input.Id, searchString = string.Empty, searchIn = Enumerable.Empty <string>(), filter = Input.Filter, sortBy = Input.SortBy, sortDirection = Input.SortDirection, itemsPerPage = Input.ItemsPerPage, currentPage = 1 }),
Type = "All"
});
}
// Check if there are any filters applied.
if (Input.Filter.Any())
{
// Go over each of the applied filters.
foreach (var value in Input.Filter)
{
// Add a corresponding new filter.
Filters.Add(new SearchFilterViewModel
{
Text = $"Filter: {Input.Options.Filter[value]}",
Link = linkGenerator.GetPathByRouteValues(httpContext: httpContext, routeName: null, values: new { id = Input.Id, searchString = Input.SearchString, searchIn = Input.SearchIn, filter = Input.Filter.Where(item => item != value), sortBy = Input.SortBy, sortDirection = Input.SortDirection, itemsPerPage = Input.ItemsPerPage, currentPage = 1 }),
Type = "Filter"
});
}
// Add a new filter for all applied filters.
Filters.Add(new SearchFilterViewModel
{
Text = "Filter: Clear all",
Link = linkGenerator.GetPathByRouteValues(httpContext: httpContext, routeName: null, values: new { id = Input.Id, searchString = Input.SearchString, searchIn = Input.SearchIn, filter = Enumerable.Empty <string>(), sortBy = Input.SortBy, sortDirection = Input.SortDirection, itemsPerPage = Input.ItemsPerPage, currentPage = 1 }),
Type = "All"
});
}
// Get only the items on the current page, as enumerable.
Items = query.Skip((Input.CurrentPage - 1) * Input.ItemsPerPage).Take(Input.ItemsPerPage).ToList();
}
/// <summary>
/// Initializes a new instance of pagination.
/// </summary>
/// <param name="linkGenerator"></param>
/// <param name="httpContext"></param>
/// <param name="input"></param>
/// <param name="totalItems"></param>
public SearchPaginationViewModel(LinkGenerator linkGenerator, HttpContext httpContext, SearchInputViewModel input, int totalItems)
{
// Get the total number of items and of pages, as well as the number of items on the current page.
TotalItems = totalItems;
CurrentPage = input.CurrentPage;
TotalPages = (int)Math.Ceiling((double)totalItems / input.ItemsPerPage);
ItemsPerPageFirst = 0 < TotalItems ? (CurrentPage - 1) * input.ItemsPerPage + 1 : 0;
ItemsPerPageLast = 0 < TotalItems?CurrentPage *Math.Min(input.ItemsPerPage, TotalItems) < TotalItems?CurrentPage *Math.Min(input.ItemsPerPage, TotalItems) : TotalItems : 0;
// Create the links for the next and the previous pages.
PreviousPageLink = CurrentPage == 1 || TotalPages == 0 ? null : linkGenerator.GetPathByRouteValues(httpContext: httpContext, routeName: null, values: new { id = input.Id, searchString = input.SearchString, searchIn = input.SearchIn, filter = input.Filter, sortBy = input.SortBy, sortDirection = input.SortDirection, itemsPerPage = input.ItemsPerPage, currentPage = CurrentPage - 1 });
NextPageLink = CurrentPage == TotalPages || TotalPages == 0 ? null : linkGenerator.GetPathByRouteValues(httpContext: httpContext, routeName: null, values: new { id = input.Id, searchString = input.SearchString, searchIn = input.SearchIn, filter = input.Filter, sortBy = input.SortBy, sortDirection = input.SortDirection, itemsPerPage = input.ItemsPerPage, currentPage = CurrentPage + 1 });
}
