@page "/first-run-setup"
@inject IAuthService AuthService
@inject ISettingsService SettingsService
@inject NavigationManager Navigation
@inject ILocalizationService Loc

@rendermode InteractiveServer

<PageTitle>Ersteinrichtung</PageTitle>

<div class="auth-page">
    <div class="auth-card">
        <div class="auth-logo">
            <img src="/Assets/logo.jpg" alt="Author Buddy" />
        </div>
        <h2>Ersteinrichtung</h2>
        <p>Willkommen bei Author Buddy! Richten Sie Ihren Administrator-Account ein.</p>

        @if (!_setupComplete)
        {
            <div class="form-group">
                <label for="adminUsername">Admin-Benutzername</label>
                <input id="adminUsername" @bind="_username" disabled="@_isBusy" />
            </div>

            <button @onclick="GeneratePassword" disabled="@_generateDisabled">Passwort generieren</button>

            @if (!string.IsNullOrEmpty(_generatedPassword))
            {
                <div class="auth-error" style="margin-top: 1rem; padding: 1rem; border: 2px solid red; background: #fff0f0; color: #c00; border-radius: 8px;">
                    <strong style="font-size: 1.2rem;">Sicherheitswarnung!</strong>
                    <p>Dieses Passwort wird nur <strong>einmalig</strong> angezeigt. Speichern Sie es sofort sicher ab.</p>
                    <div style="font-family: monospace; font-size: 1.4rem; text-align: center; padding: 0.5rem; background: white; border: 1px solid #c00; margin: 0.5rem 0; letter-spacing: 2px;">
                        @_generatedPassword
                    </div>
                    <p style="font-size: 0.85rem; color: #888;">Nach dem Klick auf "Admin erstellen" wird das Passwort nicht mehr angezeigt.</p>
                </div>

                <div class="form-group">
                    <label for="adminPassword">Passwort eingeben (zur Bestätigung)</label>
                    <input id="adminPassword" type="password" @bind="_password" />
                </div>

                <button @onclick="CreateAdmin" disabled="@_createAdminDisabled">Admin erstellen</button>
            }
        }
        else
        {
            <div class="auth-success" style="margin-top: 1rem; padding: 1rem; border: 2px solid green; background: #f0fff0; color: #080; border-radius: 8px;">
                <strong>Admin-Account erfolgreich erstellt!</strong>
                <p>Sie werden zum Login weitergeleitet...</p>
            </div>
        }

        @if (!string.IsNullOrEmpty(_errorMessage))
        {
            <div class="auth-error">@_errorMessage</div>
        }
    </div>
</div>

@code {
    private string _username = "admin";
    private string? _generatedPassword;
    private string _password = string.Empty;
    private string _errorMessage = string.Empty;
    private bool _isBusy;
    private bool _setupComplete;
    private bool _generateDisabled => _isBusy || string.IsNullOrWhiteSpace(_username);
    private bool _createAdminDisabled => _isBusy || _password != _generatedPassword;

    protected override async Task OnInitializedAsync()
    {
        var users = await SettingsService.GetUsersAsync();
        if (users.Count > 0)
        {
            Navigation.NavigateTo("/login");
        }
    }

    private void GeneratePassword()
    {
        using var rng = System.Security.Cryptography.RandomNumberGenerator.Create();
        var bytes = new byte[12];
        rng.GetBytes(bytes);
        _generatedPassword = Convert.ToBase64String(bytes).TrimEnd('=').Replace('+', 'X').Replace('/', 'Y');
        _password = string.Empty;
        _errorMessage = string.Empty;
    }

    private async Task CreateAdmin()
    {
        if (string.IsNullOrWhiteSpace(_username) || string.IsNullOrWhiteSpace(_password))
        {
            _errorMessage = "Benutzername und Passwort dürfen nicht leer sein.";
            return;
        }

        _isBusy = true;
        _errorMessage = string.Empty;

        try
        {
            var result = await AuthService.RegisterAsync(_username, _password);
            if (result)
            {
                _generatedPassword = null;
                _password = string.Empty;
                _setupComplete = true;
                StateHasChanged();
                await Task.Delay(2000);
                Navigation.NavigateTo("/login");
            }
            else
            {
                _errorMessage = "Benutzername bereits vergeben.";
            }
        }
        catch (Exception ex)
        {
            _errorMessage = $"Fehler: {ex.Message}";
        }
        finally
        {
            _isBusy = false;
        }
    }
}