chapter-organizer/WebApp/Components/Features/Events/Edit.razor

@page "/events/edit"
@attribute [Authorize]
@using Microsoft.EntityFrameworkCore
@using WebApp.Components.Shared.Components
@inject AppDbContext context
@inject NavigationManager NavigationManager

@if (EventDefinition is null)
{
    <p><em>Loading...</em></p>
    return;
}

<PageHeader
    Title="Edit"
    Subtitle="Event"
    ShowBackButton="true"
    BackButtonUrl="/events" />

<EditForm id="edit-event-form" Model="EventDefinition" OnValidSubmit="OnValidSubmit" Enhance>
    <FormChangeTracker @ref="_formChangeTracker" />
    <AntiforgeryToken />
    <DataAnnotationsValidator />
    <MudGrid>
        <MudItem xs="12" sm="7">
            <MudPaper Class="pa-4">
                <MudTextField T="string" Label="Event Name" @bind-Value="EventDefinition.Name" For="@(() => EventDefinition.Name)"></MudTextField>
                <MudTextField T="string" Label="Short Name" @bind-Value="EventDefinition.ShortName" For="@(() => EventDefinition.ShortName)"></MudTextField>

                <MudText Typo="Typo.subtitle2" Class="mt-4 mb-2">Format</MudText>
                <MudRadioGroup T="EventFormat" @bind-Value="@EventDefinition.EventFormat" For="@(() => EventDefinition.EventFormat)">
                    @foreach (EventFormat format in Enum.GetValues(typeof(EventFormat)))
                    {
                        <MudRadio T="EventFormat" Value="@format">@format.ToString()</MudRadio>
                    }
                </MudRadioGroup>

                <MudTextField T="string" Label="Description" AutoGrow="true" @bind-Value="EventDefinition.Description" For="@(() => EventDefinition.Description)" Class="mt-4"></MudTextField>
                <MudTextField T="string" Label="Theme" AutoGrow="true" @bind-Value="EventDefinition.Theme" For="@(() => EventDefinition.Theme)"></MudTextField>
                <MudTextField T="string" Label="Documentation" @bind-Value="EventDefinition.Documentation" For="@(() => EventDefinition.Documentation)"></MudTextField>
                <MudNumericField T="int?" Label="Level of Effort" @bind-Value="EventDefinition.LevelOfEffort" For="@(() => EventDefinition.LevelOfEffort)"></MudNumericField>
                <MudDivider></MudDivider>
                <MudTextField T="string" Label="Nationals Eligibility" @bind-Value="EventDefinition.Eligibility" For="@(() => EventDefinition.Eligibility)"></MudTextField>
                <MudNumericField T="int" Label="Minimum Team Size" @bind-Value="EventDefinition.MinTeamSize" For="@(() => EventDefinition.MinTeamSize)"></MudNumericField>
                <MudNumericField T="int" Label="Maxiumum Team Size" @bind-Value="EventDefinition.MaxTeamSize" For="@(() => EventDefinition.MaxTeamSize)"></MudNumericField>
                <MudNumericField T="int" Label="Team Count at Regionals" @bind-Value="EventDefinition.ChapterEligibilityCountRegionals" For="@(() => EventDefinition.ChapterEligibilityCountRegionals)"></MudNumericField>
                <MudNumericField T="int" Label="Team Count at State" @bind-Value="EventDefinition.ChapterEligibilityCountState" For="@(() => EventDefinition.ChapterEligibilityCountState)"></MudNumericField>
                <MudDivider></MudDivider>
                <MudTextField T="string" Label="Semifinalist Activity" @bind-Value="EventDefinition.SemifinalistActivity" For="@(() => EventDefinition.SemifinalistActivity)"></MudTextField>
                <MudCheckBox T="bool" Label="On Site Activity" @bind-Value="EventDefinition.OnSiteActivity" For="@(() => EventDefinition.OnSiteActivity)"></MudCheckBox>
                <MudCheckBox T="bool" Label="Requires Presubmission" @bind-Value="EventDefinition.Presubmission" For="@(() => EventDefinition.Presubmission)"></MudCheckBox>
            </MudPaper>
        </MudItem>
    </MudGrid>
</EditForm>

<FormActions>
    <MudButton ButtonType="ButtonType.Submit" Variant="Variant.Filled" Color="Color.Primary" Form="edit-event-form">Save</MudButton>
    <MudButton OnClick="HandleCancel" Variant="Variant.Text">Cancel</MudButton>
</FormActions>

@code {
    [SupplyParameterFromQuery]
    private int Id { get; set; }

    [SupplyParameterFromForm]
    private EventDefinition? EventDefinition { get; set; }

    private FormChangeTracker? _formChangeTracker;

    protected override async Task OnInitializedAsync()
    {
        EventDefinition ??= await context.Events.FirstOrDefaultAsync(m => m.Id == Id);

        if (EventDefinition is null)
        {
            NavigationManager.NavigateTo("notfound");
        }
    }

    // To protect from overposting attacks, enable the specific properties you want to bind to.
    // For more information, see https://learn.microsoft.com/aspnet/core/blazor/forms/#mitigate-overposting-attacks.
    private void OnValidSubmit()
    {
        context.Attach(EventDefinition!).State = EntityState.Modified;

        try
        {
            context.SaveChangesAsync();
            _formChangeTracker?.AllowNavigation();
            NavigationManager.NavigateTo("/events");
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!EventDefinitionExists(EventDefinition!.Id))
            {
                NavigationManager.NavigateTo("notfound");
            }
            else
            {
                throw;
            }
        }
    }

    private async Task HandleCancel()
    {
        // Discard all in-memory changes by reloading from database
        if (EventDefinition != null)
        {
            await context.Entry(EventDefinition).ReloadAsync();
        }

        _formChangeTracker?.AllowNavigation();
        NavigationManager.NavigateTo("/events");
    }

    private bool EventDefinitionExists(int id)
    {
        return context.Events.Any(e => e.Id == id);
    }
}