aliasvault/apps/server/AliasVault.Admin/Main/Pages/Emails.razor

@page "/emails"
@using AliasVault.RazorComponents.Tables
@inherits MainBase

<LayoutPageTitle>Emails</LayoutPageTitle>

<PageHeader
    BreadcrumbItems="@BreadcrumbItems"
    Title="@(TotalRecords > 0 ? $"Emails ({TotalRecords:N0})" : "Emails")"
    Description="This page shows an overview of recently received mails by this AliasVault server. Note: all email fields except 'To' are encrypted with the public key of the user and are unreadable by the server.">
    <CustomActions>
        <RefreshButton OnClick="RefreshData" ButtonText="Refresh" />
    </CustomActions>
</PageHeader>

@if (IsInitialized)
{
    <div class="px-4">
        <Paginator CurrentPage="CurrentPage" PageSize="PageSize" TotalRecords="TotalRecords" OnPageChanged="HandlePageChanged" />
        <div class="mb-3">
            <div class="relative">
                <SearchIcon />
                <input type="text" @bind-value="SearchTerm" @bind-value:event="oninput" id="search" placeholder="Search emails..." class="w-full px-4 ps-10 py-2 border rounded text-sm text-gray-700 focus:outline-none focus:ring-2 focus:ring-blue-500 dark:bg-gray-700 dark:border-gray-600 dark:placeholder-gray-400 dark:text-white">
            </div>
        </div>
    </div>
}

@if (IsLoading)
{
    <LoadingIndicator />
}
else
{
    <div class="overflow-x-auto px-4">
        <SortableTable Columns="@_tableColumns" SortColumn="@SortColumn" SortDirection="@SortDirection" OnSortChanged="HandleSortChanged">
            @foreach (var viewModel in EmailViewModelList)
            {
                <SortableTableRow>
                    <SortableTableColumn IsPrimary="true">@viewModel.Email.Id</SortableTableColumn>
                    <SortableTableColumn>@viewModel.Email.DateSystem.ToString("yyyy-MM-dd HH:mm")</SortableTableColumn>
                    <SortableTableColumn>@(viewModel.Email.FromLocal.Length > 10 ? viewModel.Email.FromLocal.Substring(0, 10) : viewModel.Email.FromLocal)@@@(viewModel.Email.FromDomain.Length > 10 ? viewModel.Email.FromDomain.Substring(0, 10) : viewModel.Email.FromDomain)</SortableTableColumn>
                    <SortableTableColumn>@viewModel.Email.ToLocal@@@viewModel.Email.ToDomain</SortableTableColumn>
                    <SortableTableColumn>
                        @if (viewModel.UserName.Length > 0)
                        {
                            <span class="line-clamp-1"><a href="users/@viewModel.UserId">@viewModel.UserName</a></span>
                        }
                        else
                        {
                            <span class="line-clamp-1">n/a</span>
                        }
                    </SortableTableColumn>
                    <SortableTableColumn>@viewModel.Email.Attachments.Count</SortableTableColumn>
                </SortableTableRow>
            }
        </SortableTable>
    </div>
}

@code {
    /// <summary>
    /// The search term from the query parameter.
    /// </summary>
    [Parameter]
    [SupplyParameterFromQuery(Name = "search")]
    public string? SearchTermFromQuery { get; set; }

    private readonly List<TableColumn> _tableColumns = [
        new TableColumn { Title = "ID", PropertyName = "Id" },
        new TableColumn { Title = "Time", PropertyName = "DateSystem" },
        new TableColumn { Title = "From", PropertyName = "From" },
        new TableColumn { Title = "To", PropertyName = "To" },
        new TableColumn { Title = "User", Sortable = false },
        new TableColumn { Title = "Attachments", PropertyName = "Attachments" },
    ];

    private List<EmailViewModel> EmailViewModelList { get; set; } = [];
    private bool IsInitialized { get; set; } = false;
    private bool IsLoading { get; set; } = true;
    private int CurrentPage { get; set; } = 1;
    private int PageSize { get; set; } = 50;
    private int TotalRecords { get; set; }
    private string _searchTerm = string.Empty;

    /// <summary>
    /// The last search term.
    /// </summary>
    private string _lastSearchTerm = string.Empty;

    private string SearchTerm
    {
        get => _searchTerm;
        set
        {
            if (_searchTerm != value)
            {
                _searchTerm = value;
                _ = RefreshData();
            }
        }
    }

    private string SortColumn { get; set; } = "Id";
    private SortDirection SortDirection { get; set; } = SortDirection.Descending;
    private async Task HandleSortChanged((string column, SortDirection direction) sort)
    {
        SortColumn = sort.column;
        SortDirection = sort.direction;
        await RefreshData();
    }

    /// <inheritdoc />
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            // Set the search term from the query parameter if it exists
            if (!string.IsNullOrEmpty(SearchTermFromQuery))
            {
                _searchTerm = SearchTermFromQuery;
            }
            
            await RefreshData();
        }
    }

    private void HandlePageChanged(int newPage)
    {
        CurrentPage = newPage;
        _ = RefreshData();
    }

    private async Task RefreshData()
    {
        IsLoading = true;
        StateHasChanged();

        await using var dbContext = await DbContextFactory.CreateDbContextAsync();

        IQueryable<Email> query = dbContext.Emails;

        query = ApplySearchFilter(query);
        query = ApplySort(query);

        TotalRecords = await query.CountAsync();
        var emailList = await query
            .Skip((CurrentPage - 1) * PageSize)
            .Take(PageSize)
            .ToListAsync();

        // Get all usernames for the emails in the current list
        var encryptionKeyIds = emailList.Select(x => x.UserEncryptionKeyId).Distinct().ToList();
        var encryptionKeyUsernames = await dbContext.UserEncryptionKeys
                    .Where(x => encryptionKeyIds.Contains(x.Id))
                    .Join(dbContext.AliasVaultUsers, x => x.UserId, y => y.Id, (x, y) => new { EncryptionKeyId = x.Id, UserId = y.Id, y.UserName })
                    .ToListAsync();

        // Create new list of viewmodels
        EmailViewModelList = new List<EmailViewModel>();

        foreach (var email in emailList)
        {
            var encryptionKey = encryptionKeyUsernames.FirstOrDefault(x => x.EncryptionKeyId == email.UserEncryptionKeyId);
            EmailViewModelList.Add(new EmailViewModel { Email = email, UserId = encryptionKey?.UserId ?? string.Empty, UserName = encryptionKey?.UserName ?? string.Empty });
        }

        IsLoading = false;
        IsInitialized = true;
        StateHasChanged();
    }

    /// <summary>
    /// Applies a search filter to the query based on the search term.
    /// </summary>
    /// <param name="query">The query to filter.</param>
    /// <returns>The filtered query.</returns>
    private IQueryable<Email> ApplySearchFilter(IQueryable<Email> query)
    {
        if (SearchTerm.Length > 0)
        {
            // Reset page number back to 1 if the search term has changed.
            if (SearchTerm != _lastSearchTerm && CurrentPage != 1)
            {
                CurrentPage = 1;
            }
            _lastSearchTerm = SearchTerm;

            query = query.Where(x => EF.Functions.Like(x.To.ToLower(), "%" + SearchTerm.Trim().ToLower() + "%"));
        }

        return query;
    }

    /// <summary>
    /// Applies sorting to the query based on the sort column and direction.
    /// </summary>
    /// <param name="query">The query to sort.</param>
    /// <returns>The sorted query.</returns>
    private IQueryable<Email> ApplySort(IQueryable<Email> query)
    {
        // Apply sort
        switch (SortColumn)
        {
            case "Id":
                query = SortDirection == SortDirection.Ascending
                    ? query.OrderBy(x => x.Id)
                    : query.OrderByDescending(x => x.Id);
                break;
            case "DateSystem":
                query = SortDirection == SortDirection.Ascending
                    ? query.OrderBy(x => x.DateSystem)
                    : query.OrderByDescending(x => x.DateSystem);
                break;
            case "From":
                query = SortDirection == SortDirection.Ascending
                    ? query.OrderBy(x => x.FromLocal + "@" + x.FromDomain)
                    : query.OrderByDescending(x => x.FromLocal + "@" + x.FromDomain);
                break;
            case "To":
                query = SortDirection == SortDirection.Ascending
                    ? query.OrderBy(x => x.ToLocal + "@" + x.ToDomain)
                    : query.OrderByDescending(x => x.ToLocal + "@" + x.ToDomain);
                break;
            case "Attachments":
                query = SortDirection == SortDirection.Ascending
                    ? query.OrderBy(x => x.Attachments.Count)
                    : query.OrderByDescending(x => x.Attachments.Count);
                break;
            default:
                query = query.OrderByDescending(x => x.DateSystem);
                break;
        }

        return query;
    }

    private sealed class EmailViewModel
    {
        public Email Email { get; set; } = new();
        public string UserId { get; set; } = string.Empty;
        public string UserName { get; set; } = string.Empty;
    }
}