@page "/fetchdata"
@using WasmServerPrerenderedWPersist.Shared
@inject HttpClient Http
@inject PersistentComponentState ApplicationState
@implements IDisposable


<PageTitle>Weather forecast</PageTitle>

<h1>Weather forecast</h1>

<p>This component demonstrates fetching data from the server.</p>

@if (forecasts == null)
{
    <p><em>Loading...</em></p>
}
else
{
    <table class="table">
        <thead>
            <tr>
                <th>Date</th>
                <th>Temp. (C)</th>
                <th>Temp. (F)</th>
                <th>Summary</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var forecast in forecasts)
            {
                <tr>
                    <td>@forecast.Date.ToShortDateString()</td>
                    <td>@forecast.TemperatureC</td>
                    <td>@forecast.TemperatureF</td>
                    <td>@forecast.Summary</td>
                </tr>
            }
        </tbody>
    </table>
}

@code {
private WeatherForecast[]? forecasts;
private PersistingComponentStateSubscription _subscription;

protected override async Task OnInitializedAsync()
{
    _subscription = ApplicationState.RegisterOnPersisting(PersistState);
    if (ApplicationState.TryTakeFromJson<WeatherForecast[]>("weatherdata", out var stored))
    {
        forecasts = stored;
    }
    else
    {
        forecasts = await Http.GetFromJsonAsync<WeatherForecast[]>("WeatherForecast");
    }
}

private Task PersistState()
{
    ApplicationState.PersistAsJson("weatherdata", forecasts);
    return Task.CompletedTask;
}

public void Dispose()
{
    _subscription.Dispose();
}

}
