@page "/login/{EnvelopeKey}"
@using EnvelopeGenerator.ReceiverUI.Options
@using Microsoft.Extensions.Options

<div class="login-page-wrapper d-flex align-items-center justify-content-center min-vh-100 bg-light">
    <div class="card shadow-sm" style="max-width: 420px; width: 100%;">
        <div class="card-body p-4">

            <h4 class="card-title mb-1">Zugang zum Dokument</h4>
            <p class="text-muted mb-4" style="font-size: 0.9rem;">
                Bitte geben Sie den Zugangscode ein, den Sie per E-Mail erhalten haben, um das Dokument zu öffnen.
            </p>

            @if (!string.IsNullOrWhiteSpace(ErrorMessage)) {
                <div class="alert alert-danger py-2">@ErrorMessage</div>
            }

            <div class="mb-3">
                <label class="form-label" for="login-access-code">Zugangscode</label>
                <input id="login-access-code"
                       type="password"
                       class="form-control"
                       placeholder="Zugangscode eingeben"
                       @bind="AccessCode"
                       @bind:event="oninput"
                       @onkeydown="OnKeyDownAsync"
                       disabled="@IsLoading" />
            </div>

            <button class="btn btn-primary w-100"
                    @onclick="SubmitAsync"
                    disabled="@(IsLoading || string.IsNullOrWhiteSpace(AccessCode))">
                @if (IsLoading) {
                    <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>
                    <span>Überprüfen …</span>
                } else {
                    <span>Weiter</span>
                }
            </button>

        </div>
    </div>
</div>

@code {
    [Parameter] public string EnvelopeKey { get; set; } = string.Empty;

    string AccessCode = string.Empty;
    string? ErrorMessage;
    bool IsLoading;

    async Task OnKeyDownAsync(Microsoft.AspNetCore.Components.Web.KeyboardEventArgs e) {
        if (e.Key == "Enter")
            await SubmitAsync();
    }

    async Task SubmitAsync() {
        if (string.IsNullOrWhiteSpace(AccessCode)) return;

        IsLoading = true;
        ErrorMessage = null;
        await InvokeAsync(StateHasChanged);

        // TODO: API entegrasyonu buraya eklenecek
        await Task.Delay(500); // placeholder

        IsLoading = false;
        ErrorMessage = "Der eingegebene Zugangscode ist ungültig. Bitte versuchen Sie es erneut.";
        await InvokeAsync(StateHasChanged);
    }
}