@page "/User"
@implements IDisposable
@if (_isInitialized) {
    <h3>User (@WhoAmI.UserId#@WhoAmI.DeviceId[..5])</h3>
    <LinkButton OnClick="@(() => {
                             NavigationManager.NavigateTo("/User/Devices");
                             return Task.CompletedTask;
                         })">Manage devices
    </LinkButton>
    <hr/>

    <span>
        Raise alarm:
        <LinkButton OnClick="@(() => RaiseAlarm("fall"))">Fall</LinkButton>
        <LinkButton OnClick="@(() => RaiseAlarm("toilet"))">Toilet</LinkButton>
        <LinkButton Color="#FF0000" OnClick="@(() => RaiseAlarm(null))">Clear</LinkButton>
    </span>
    <br/>
    
    <span>Budget: @Math.Round(Budget.Amount, 2)</span><br/>
    
    <span>
        Spend 
        <FancyTextBox Value="@ToSpend.Amount.ToString()" ValueChanged="s => ToSpend.Amount = double.Parse(s)"/> 
        EUR at 
        <FancyTextBox @bind-Value="@ToSpend.Venue"/> 
        for 
        <FancyTextBox @bind-Value="@ToSpend.Reason"/> 
        <LinkButton OnClick="@(() => SpendBudget(ToSpend))">Spend</LinkButton>
    </span><br/>
    
    <i>Spend history is comming soon!</i>
    @* oops, forgot to use the DTO for getting own budget... *@
    @* @foreach(var history in Budget.History) { *@
    @*     <div> *@
    @*         <span>@history.CreatedAt!.Value.ToLocalTime()</span> -  *@
    @*         <span>@history.Amount EUR</span> -  *@
    @*         <span>@history.Reason</span> -  *@
    @*         <span>@history.Venue</span> *@
    @*     </div> *@
    @* } *@
    
}

@if (Alarm != null) {
    <ModalWindow Title="User alarm">
        <div class="modal-body">
            <span><strong>Alarm ID:</strong> @Alarm.Id</span><br/>
            <span><strong>Reason:</strong> @Alarm.Reason</span><br/>
            <span><strong>Raised at:</strong> @Alarm.CreatedAt.ToLocalTime()</span><br/>
        </div>
        <div class="modal-footer">
            <LinkButton Color="#FF0000" OnClick="@(() => RaiseAlarm(null))">Clear Alarm</LinkButton>
        </div>
    </ModalWindow>
}

@code {

    bool _isInitialized = false;
    bool _running = true;

    private WhoAmI WhoAmI { get; set; } = null!;
    private AlarmDto? Alarm { get; set; } = null!;
    private BudgetHistoryEntry ToSpend { get; set; } = new() {
        Amount = 0,
        Reason = string.Empty,
        Venue = string.Empty 
    };

    protected override async Task OnInitializedAsync() {
        WhoAmI = await App.UserClient.WhoAmI();
        _ = PollAlarm();
        Budget = await App.UserClient.GetBudget();
        NavigationManager.LocationChanged += (sender, args) => {
            if (args.Location != NavigationManager.Uri) {
                _running = false;
            }
        };
        _isInitialized = true;
    }

    private async Task PollAlarm() {
        while (_running) {
            var newAlarm = await App.UserClient.GetAlarm();
            if (Alarm?.Id != newAlarm?.Id) {
                Alarm = newAlarm;
                StateHasChanged();
            }
            
            var newBudget = await App.UserClient.GetBudget();
            if (Math.Abs(Budget.Amount - newBudget.Amount) > 0.01) {
                Budget = newBudget;
                StateHasChanged();
            }

            await Task.Delay(1000);
        }
    }

    public CurrentBalance Budget { get; set; }

    private async Task RaiseAlarm(string? reason) {
        if (string.IsNullOrWhiteSpace(reason))
            await App.UserClient.DeleteAlarm();
        else
            await App.UserClient.SetAlarm(new() { Reason = reason });
    }

    private void ReleaseUnmanagedResources() {
        _running = false;
    }

    public void Dispose() {
        ReleaseUnmanagedResources();
        GC.SuppressFinalize(this);
    }

    ~User() => ReleaseUnmanagedResources();

    private async Task SpendBudget(BudgetHistoryEntry toSpend) {
        await App.UserClient.SpendBudget(toSpend);
    }

}