@using System.Globalization
@using MudBlazor

<MudDialog>
    <DialogContent>
        <MudStack Spacing="3" Class="pa-2">
            <MudSelect @bind-Value="_selectedYear" Label="Jahr" Variant="Variant.Outlined">
                @foreach (var year in _years)
                {
                    <MudSelectItem Value="@year">@year</MudSelectItem>
                }
            </MudSelect>
            <MudSelect @bind-Value="_selectedMonth" Label="Monat" Variant="Variant.Outlined">
                @foreach (var month in _months)
                {
                    <MudSelectItem Value="@month.Value">@month.Name</MudSelectItem>
                }
            </MudSelect>
        </MudStack>
    </DialogContent>
    <DialogActions>
        <MudButton OnClick="Cancel">Abbrechen</MudButton>
        <MudButton Color="Color.Primary" Variant="Variant.Filled" OnClick="Submit">Herunterladen</MudButton>
    </DialogActions>
</MudDialog>

@code {
    [CascadingParameter] IMudDialogInstance MudDialog { get; set; } = null!;

    private int _selectedYear = DateTime.Today.Year;
    private int _selectedMonth = DateTime.Today.Month;

    private List<int> _years = Enumerable.Range(DateTime.Today.Year - 5, 6).OrderByDescending(y => y).ToList();
    
    private class MonthOption
    {
        public int Value { get; set; }
        public string Name { get; set; } = "";
    }
    
    private List<MonthOption> _months = [];

    protected override void OnInitialized()
    {
        var deCulture = new CultureInfo("de-DE");
        _months = Enumerable.Range(1, 12).Select(m => new MonthOption
        {
            Value = m,
            Name = deCulture.DateTimeFormat.GetMonthName(m)
        }).ToList();
    }

    public class MonthSelectorResult
    {
        public int Year { get; set; }
        public int Month { get; set; }
    }

    void Submit() => MudDialog.Close(DialogResult.Ok(new MonthSelectorResult { Year = _selectedYear, Month = _selectedMonth }));
    void Cancel() => MudDialog.Cancel();
}