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OpenArchival.Blazor.ArchiveDisplay/SearchArchive.razor
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242
OpenArchival.Blazor.ArchiveDisplay/SearchArchive.razor
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@page "/search"
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@page "/search/{SearchTerms}"
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@using Microsoft.AspNetCore.Components.Web
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@using Microsoft.EntityFrameworkCore
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@using Microsoft.Extensions.Logging
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@using MudBlazor
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@using NpgsqlTypes
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@using OpenArchival.DataAccess
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@using Persic
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@using Npgsql.EntityFrameworkCore.PostgreSQL
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@using System.Linq
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@using System.Linq.Expressions
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@using OpenArchival.Blazor.ArtifactGroupingDisplay
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@using OpenArchival.Blazor.ArchiveSearch
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@namespace OpenArchival.Blazor.ArchiveDisplay
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<ArchiveSearchBar SearchTermsChanged="OnSearchSubmittedAsync"/>
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<FilterSelectorComponent
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@bind-SelectedFilter="_selectedFilter"
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@bind-SelectedTitlePrefix="_selectedLetter"
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ApplyFiltersClicked="OnApplyFilters"></FilterSelectorComponent>
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@if (_totalResults > 0 && !_allArtifactsMode)
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{
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<MudGrid Justify="Justify.FlexStart" Class="mt-1 ml-1 mb-2">
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<MudText Typo="Typo.subtitle2" Class="my-2">@_totalResults results found</MudText>
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<MudButton Class="ml-1"
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StartIcon="@Icons.Material.Filled.Clear"
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OnClick="@(args => OnClearResults(args, true, true))"
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Variant="Variant.Filled"
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Color="Color.Primary"
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Size="Size.Small">Clear</MudButton>
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</MudGrid>
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}
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@if (_artifactGroupings.Count > 0)
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{
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<MudGrid>
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@foreach (var grouping in _artifactGroupings)
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{
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<MudItem xs="12" sm="6" md="4" lg="4">
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<ArtifactGroupingSearchResult ArtifactGrouping="grouping"></ArtifactGroupingSearchResult>
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</MudItem>
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}
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</MudGrid>
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<MudPaper Class="d-flex justify-center py-2 mt-4" Elevation="0">
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<MudPagination Count="_totalPages" Selected="_currentPage" SelectedChanged="OnPageChangedAsync" />
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</MudPaper>
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}
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@inject IDbContextFactory<ApplicationDbContext> ContextFactory;
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@inject ILogger<SearchArchive> Logger;
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@inject NavigationManager NavigationManager;
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@code {
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[Parameter]
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public string SearchTerms { get; set; } = "";
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private ArchiveSearchFilterType _selectedFilter = ArchiveSearchFilterType.All;
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// Field to store the current filter logic
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private Expression<Func<ArtifactGrouping, bool>> _currentFilterPredicate;
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private List<ArtifactGrouping> _artifactGroupings { get; set; } = [];
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private int _currentPage { get; set; } = 1;
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private int _totalPages { get; set; } = 0;
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private int _totalResults { get; set; } = 0;
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private const int PageSize = 20;
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private bool _allArtifactsMode = true;
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private string? _selectedLetter;
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protected override async Task OnParametersSetAsync()
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{
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if (string.IsNullOrWhiteSpace(SearchTerms))
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{
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_allArtifactsMode = true;
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await LoadPageAsync(1);
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} else
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{
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_allArtifactsMode = false;
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await PerformSearchAsync();
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}
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}
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private IQueryable<ArtifactGrouping> BuildFilterQuery(IQueryable<ArtifactGrouping> startingQuery)
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{
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// Filter
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if (_currentFilterPredicate != null && !_allArtifactsMode)
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{
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startingQuery = startingQuery.Where(_currentFilterPredicate);
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}
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if (!string.IsNullOrWhiteSpace(_selectedLetter))
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{
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string likePattern = $"{_selectedLetter}%";
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startingQuery = startingQuery.Where(artifact => EF.Functions.ILike(artifact.Title, likePattern));
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}
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return startingQuery;
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}
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/// <summary>
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/// Called by the ArchiveSearchBar component's 'SearchTermsChanged' event.
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/// </summary>
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private async Task OnSearchSubmittedAsync(string searchTerms)
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{
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await OnClearResults(null, false, true);
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if (string.IsNullOrWhiteSpace(searchTerms))
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{
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// Tell the clear operation not to navigate back to the search page and refresh
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_allArtifactsMode = true;
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await PerformSearchAsync();
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return;
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}
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SearchTerms = searchTerms;
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NavigationManager.NavigateTo($"/search/{Uri.EscapeDataString(SearchTerms)}", replace: true);
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_allArtifactsMode = false;
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// This eventually calls LoadPageAsync
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await PerformSearchAsync();
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}
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/// <summary>
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/// Sets the search predicate, calculates total results, and loads the first page.
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/// </summary>
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private async Task PerformSearchAsync()
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{
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// Determine which filter expression to use
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switch (_selectedFilter)
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{
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case ArchiveSearchFilterType.Tags:
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_currentFilterPredicate = x => x.TagsSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.Title:
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_currentFilterPredicate = x => x.TitleSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.Description:
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_currentFilterPredicate = x => x.DescriptionSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.Defects:
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_currentFilterPredicate = x => x.DefectsSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.Filenames:
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_currentFilterPredicate = x => x.FilenamesSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.ArtifactTranscriptions:
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_currentFilterPredicate = x => x.FileContentSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.ListedNames:
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_currentFilterPredicate = x => x.ListedNamesSearchVector.Matches(SearchTerms);
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break;
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case ArchiveSearchFilterType.All:
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default:
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_currentFilterPredicate = x => x.AllSearchVector.Matches(SearchTerms);
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break;
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}
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// Load the first page with the chosen filter
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await LoadPageAsync(1);
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}
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private async Task OnPageChangedAsync(int page)
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{
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await LoadPageAsync(page);
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}
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/// <summary>
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/// Fetches a specific page of data from the database using the currently set filter.
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/// </summary>
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private async Task LoadPageAsync(int page)
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{
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await using var context = await ContextFactory.CreateDbContextAsync();
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IQueryable<ArtifactGrouping> query = context.ArtifactGroupings;
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query = BuildFilterQuery(query);
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// Select child data we want
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query = query
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.Include(x => x.ChildArtifactEntries)
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.ThenInclude(x => x.Files);
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// If we are showing all artifacts, then order results alphabetically
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if (_allArtifactsMode)
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{
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query = query.OrderBy(artifact => artifact.Title);
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} else
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{
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query = query.OrderBy(artifact => artifact.Id);
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}
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_totalResults = await query.CountAsync();
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_totalPages = (int)Math.Ceiling(_totalResults / (double)PageSize);
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_currentPage = page;
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query = query
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.Skip((_currentPage - 1) * PageSize)
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.Take(PageSize);
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_artifactGroupings = await query.ToListAsync();
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StateHasChanged();
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}
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private async Task OnClearResults(Microsoft.AspNetCore.Components.Web.MouseEventArgs args, bool navigate = true, bool resetFirstLetterFilter = false)
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{
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_totalResults = 0;
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_artifactGroupings.Clear();
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_currentPage = 1;
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_totalPages = 0;
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SearchTerms = "";
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if (navigate)
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{
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NavigationManager.NavigateTo("/search", replace: true);
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}
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if (resetFirstLetterFilter)
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{
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_selectedLetter = "";
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}
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StateHasChanged();
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}
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private async Task OnApplyFilters(MouseEventArgs args)
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{
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if (string.IsNullOrWhiteSpace(SearchTerms))
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{
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_allArtifactsMode = true;
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} else
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{
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_allArtifactsMode = false;
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}
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await PerformSearchAsync();
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}
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}
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