EnvelopeGenerator/EnvelopeGenerator.ReceiverUI/Shared/LanguageSelector.razor

@using System.Globalization
@using EnvelopeGenerator.ReceiverUI.Services
@inject IJSRuntime JSRuntime
@inject NavigationManager Navigation
@inject CultureService CultureService

<div class="language-selector">
    <button class="language-selector__trigger" @onclick="ToggleDropdown" aria-label="Select Language">
        <span class="fi fi-@GetFlagCode(CurrentCulture)"></span>
        <span class="language-selector__arrow">@GetLanguageName(CurrentCulture)</span>
    </button>
    
    @if (isOpen)
    {
        <div class="language-selector__dropdown">
            <button class="language-selector__option" @onclick="@(() => ChangeLanguageAsync("de-DE"))">
                <span class="fi fi-de"></span>
                <span>Deutsch</span>
            </button>
            <button class="language-selector__option" @onclick="@(() => ChangeLanguageAsync("en-US"))">
                <span class="fi fi-us"></span>
                <span>English</span>
            </button>
            <button class="language-selector__option" @onclick="@(() => ChangeLanguageAsync("fr-FR"))">
                <span class="fi fi-fr"></span>
                <span>Français</span>
            </button>
        </div>
    }
</div>

@code {
    private bool isOpen = false;
    private string CurrentCulture => CultureInfo.CurrentCulture.Name;

    private void ToggleDropdown()
    {
        isOpen = !isOpen;
    }

    private async Task ChangeLanguageAsync(string culture)
    {
        if (CultureInfo.CurrentCulture.Name != culture)
        {
            await CultureService.SetCultureAsync(culture);
            
            // Set culture without page reload
            var cultureInfo = new CultureInfo(culture);
            CultureInfo.DefaultThreadCurrentCulture = cultureInfo;
            CultureInfo.DefaultThreadCurrentUICulture = cultureInfo;
            
            // Navigate without reload to trigger re-render
            Navigation.NavigateTo(Navigation.Uri, forceLoad: false);
        }
        
        isOpen = false;
    }

    private string GetFlagCode(string culture)
    {
        return culture switch
        {
            "de-DE" => "de",
            "en-US" => "us",
            "fr-FR" => "fr",
            _ => "de"
        };
    }

    private string GetLanguageName(string culture)
    {
        return culture switch
        {
            "de-DE" => "Deutsch",
            "en-US" => "English",
            "fr-FR" => "Français",
            _ => "Deutsch"
        };
    }
}