@page "/envelope/login/{EnvelopeKey}"
@rendermode InteractiveWebAssembly
@using EnvelopeGenerator.Server.Client.Services
@using EnvelopeGenerator.Application.Resources
@using Microsoft.Extensions.Localization
@inject AuthService AuthService
@inject NavigationManager Navigation
@inject IStringLocalizer<Resource> UiLocalizer

<div class="login-page-wrapper d-flex align-items-center justify-content-center min-vh-100">
    <div class="login-card card shadow border-0" style="max-width: 440px; width: 100%;">

        <div class="card-header text-white text-center py-4 border-0" style="background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%); border-radius: calc(0.375rem - 1px) calc(0.375rem - 1px) 0 0;">
            <div class="mb-2">
                <svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" fill="currentColor" viewBox="0 0 16 16">
                    <path d="M8 1a2 2 0 0 1 2 2v4H6V3a2 2 0 0 1 2-2zm3 6V3a3 3 0 0 0-6 0v4a2 2 0 0 0-2 2v5a2 2 0 0 0 2 2h6a2 2 0 0 0 2-2V9a2 2 0 0 0-2-2z" />
                </svg>
            </div>
            <h5 class="mb-0 fw-semibold">@L("OpenDocument", "Dokument öffnen")</h5>
            <p class="mb-0 mt-1 opacity-75" style="font-size: 0.85rem;">@L("ReceiverLogin_Subtitle", "Sicherer Zugang mit Zugangscode")</p>
        </div>

        <div class="card-body p-4">

            <p class="text-muted mb-4" style="font-size: 0.875rem; line-height: 1.5;">
                @L("ReceiverLogin_Description", "Bitte geben Sie den Zugangscode ein, den Sie per E-Mail erhalten haben, um das Dokument sicher zu öffnen.")
            </p>

            @if (LoginResult == EnvelopeLoginResult.NotFound)
            {
                <div class="alert alert-warning d-flex align-items-start gap-2 py-2" role="alert">
                    <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" fill="currentColor" class="flex-shrink-0 mt-1" viewBox="0 0 16 16">
                        <path d="M8.982 1.566a1.13 1.13 0 0 0-1.96 0L.165 13.233c-.457.778.091 1.767.98 1.767h13.713c.889 0 1.438-.99.98-1.767L8.982 1.566zM8 5c.535 0 .954.462.9.995l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 5.995A.905.905 0 0 1 8 5zm.002 6a1 1 0 1 1 0 2 1 1 0 0 1 0-2z" />
                    </svg>
                    <div>
                        <strong>@L("ReceiverLogin_NotFound_Title", "Dokument nicht gefunden.")</strong><br />
                        <span style="font-size:0.85rem;">@L("ReceiverLogin_NotFound_Body", "Der angegebene Zugangscode konnte keinem Dokument zugeordnet werden. Bitte prüfen Sie den Link in Ihrer E-Mail.")</span>
                    </div>
                </div>
            }
            else if (LoginResult == EnvelopeLoginResult.InvalidCode)
            {
                <div class="alert alert-danger d-flex align-items-start gap-2 py-2" role="alert">
                    <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" fill="currentColor" class="flex-shrink-0 mt-1" viewBox="0 0 16 16">
                        <path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0zM5.354 4.646a.5.5 0 1 0-.708.708L7.293 8l-2.647 2.646a.5.5 0 0 0 .708.708L8 8.707l2.646 2.647a.5.5 0 0 0 .708-.708L8.707 8l2.647-2.646a.5.5 0 0 0-.708-.708L8 7.293 5.354 4.646z" />
                    </svg>
                    <div>
                        <strong>@L("ReceiverLogin_InvalidCode_Title", "Ungültiger Zugangscode.")</strong><br />
                        <span style="font-size:0.85rem;">@L("ReceiverLogin_InvalidCode_Body", "Der eingegebene Code ist falsch. Bitte versuchen Sie es erneut.")</span>
                    </div>
                </div>
            }
            else if (LoginResult == EnvelopeLoginResult.Error)
            {
                <div class="alert alert-secondary d-flex align-items-start gap-2 py-2" role="alert">
                    <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" fill="currentColor" class="flex-shrink-0 mt-1" viewBox="0 0 16 16">
                        <path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14zm0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16z" />
                        <path d="M7.002 11a1 1 0 1 1 2 0 1 1 0 0 1-2 0zM7.1 4.995a.905.905 0 1 1 1.8 0l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 4.995z" />
                    </svg>
                    <div>
                        <strong>@L("ServerError", "Serverfehler.")</strong><br />
                        <span style="font-size:0.85rem;">@L("UnexpectedErrorTryAgainLater", "Ein unerwarteter Fehler ist aufgetreten. Bitte versuchen Sie es später erneut.")</span>
                    </div>
                </div>
            }

            <div class="mb-4">
                <label class="form-label fw-medium" for="login-access-code">
                    @L("AccessCode", "Zugangscode")
                    <span class="text-danger ms-1">*</span>
                </label>
                <div class="input-group">
                    <span class="input-group-text bg-light border-end-0">
                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="#6c757d" viewBox="0 0 16 16">
                            <path d="M3.5 11.5a3.5 3.5 0 1 1 3.163-5H14L15.5 8 14 9.5l-1-1-1 1-1-1-1 1-1-1-1.837 1.337A3.5 3.5 0 0 1 3.5 11.5zm0-1a2.5 2.5 0 1 0 0-5 2.5 2.5 0 0 0 0 5z" />
                        </svg>
                    </span>
                    <input id="login-access-code"
                           type="@(ShowCode ? "text" : "password")"
                           class="form-control border-start-0 border-end-0 @(LoginResult == EnvelopeLoginResult.InvalidCode ? "is-invalid" : null)"
                           placeholder="@L("ReceiverLogin_AccessCode_Placeholder", "Zugangscode eingeben")"
                           @bind="AccessCode"
                           @bind:event="oninput"
                           @onkeydown="OnKeyDownAsync"
                           disabled="@IsLoading"
                           autocomplete="one-time-code" />
                    <button type="button"
                            class="btn btn-outline-secondary border-start-0"
                            style="border-left: none;"
                            tabindex="-1"
                            @onclick="() => ShowCode = !ShowCode">
                        @if (ShowCode)
                        {
                            <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
                                <path d="M13.359 11.238C15.06 9.72 16 8 16 8s-3-5.5-8-5.5a7.028 7.028 0 0 0-2.79.588l.77.771A5.944 5.944 0 0 1 8 3.5c2.12 0 3.879 1.168 5.168 2.457A13.134 13.134 0 0 1 14.828 8c-.058.087-.122.183-.195.288-.335.48-.83 1.12-1.465 1.755-.165.165-.337.328-.517.486l.708.709z" />
                                <path d="M11.297 9.176a3.5 3.5 0 0 0-4.474-4.474l.823.823a2.5 2.5 0 0 1 2.829 2.829l.822.822zm-2.943 1.299.822.822a3.5 3.5 0 0 1-4.474-4.474l.823.823a2.5 2.5 0 0 0 2.829 2.829z" />
                                <path d="M3.35 5.47c-.18.16-.353.322-.518.487A13.134 13.134 0 0 0 1.172 8l.195.288c.335.48.83 1.12 1.465 1.755C4.121 11.332 5.881 12.5 8 12.5c.716 0 1.39-.133 2.02-.36l.77.772A7.029 7.029 0 0 1 8 13.5C3 13.5 0 8 0 8s.939-1.721 2.641-3.238l.708.709z" />
                                <path fill-rule="evenodd" d="M13.646 14.354l-12-12 .708-.708 12 12-.708.708z" />
                            </svg>
                        }
                        else
                        {
                            <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
                                <path d="M16 8s-3-5.5-8-5.5S0 8 0 8s3 5.5 8 5.5S16 8 16 8zM1.173 8a13.133 13.133 0 0 1 1.66-2.043C4.12 4.668 5.88 3.5 8 3.5c2.12 0 3.879 1.168 5.168 2.457A13.133 13.133 0 0 1 14.828 8c-.058.087-.122.183-.195.288-.335.48-.83 1.12-1.465 1.755C11.879 11.332 10.119 12.5 8 12.5c-2.12 0-3.879-1.168-5.168-2.457A13.134 13.134 0 0 1 1.172 8z" />
                                <path d="M8 5.5a2.5 2.5 0 1 0 0 5 2.5 2.5 0 0 0 0-5zM4.5 8a3.5 3.5 0 1 1 7 0 3.5 3.5 0 0 1-7 0z" />
                            </svg>
                        }
                    </button>
                </div>
            </div>

            <button class="btn btn-primary w-100 py-2 fw-medium"
                    style="background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%); border: none;"
                    @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>@L("VerifyInProgress", "Überprüfen …")</span>
                }
                else
                {
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="me-2" viewBox="0 0 16 16">
                        <path d="M8 1a2 2 0 0 1 2 2v4H6V3a2 2 0 0 1 2-2zm3 6V3a3 3 0 0 0-6 0v4a2 2 0 0 0-2 2v5a2 2 0 0 0 2 2h6a2 2 0 0 0 2-2V9a2 2 0 0 0-2-2z" />
                    </svg>
                    <span>@L("OpenDocument", "Dokument öffnen")</span>
                }
            </button>

        </div>

        <div class="card-footer text-center text-muted py-3 border-0 bg-transparent" style="font-size: 0.78rem;">
            @L("ReceiverLogin_FooterHelp", "Bei Problemen wenden Sie sich bitte an den Absender des Dokuments.")
        </div>

    </div>
</div>

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

    string AccessCode = string.Empty;
    bool ShowCode;
    bool IsLoading;
    EnvelopeLoginResult? LoginResult;

    protected override async Task OnInitializedAsync()
    {
        if (string.IsNullOrWhiteSpace(EnvelopeKey))
            return;

        _ = await AuthService.RequestEnvelopeReceiverAccessCodeAsync(EnvelopeKey);
    }

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

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

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

        var result = await AuthService.LoginEnvelopeReceiverAsync(EnvelopeKey, AccessCode.Trim());

        if (result == EnvelopeLoginResult.Success)
        {
            Navigation.NavigateTo($"/envelope/{Uri.EscapeDataString(EnvelopeKey)}", forceLoad: true);
            return;
        }

        LoginResult = result;
        IsLoading = false;
        await InvokeAsync(StateHasChanged);
    }

    string L(string key, string fallback)
    {
        var value = UiLocalizer[key];
        return value.ResourceNotFound ? fallback : value.Value;
    }
}