@page "/sender/login"
@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="M11 6a3 3 0 1 1-6 0 3 3 0 0 1 6 0z"/>
                    <path fill-rule="evenodd" d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8zm8-7a7 7 0 0 0-5.468 11.37C3.242 11.226 4.805 10 8 10s4.757 1.225 5.468 2.37A7 7 0 0 0 8 1z"/>
                </svg>
            </div>
            <h5 class="mb-0 fw-semibold">@L("SenderLogin_Title", "Sender Anmeldung")</h5>
            <p class="mb-0 mt-1 opacity-75" style="font-size: 0.85rem;">@L("SenderLogin_Subtitle", "Sicherer Zugang zum Sender-Dashboard")</p>
        </div>

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

            <p class="text-muted mb-4" style="font-size: 0.875rem; line-height: 1.5;">
                @L("SenderLogin_Description", "Bitte melden Sie sich mit Ihren Zugangsdaten an, um auf das Sender-Dashboard zuzugreifen.")
            </p>

            @if (LoginResult == SenderLoginResult.InvalidCredentials) {
                <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("SenderLogin_InvalidCredentials_Title", "Ungültige Anmeldedaten.")</strong><br />
                        <span style="font-size:0.85rem;">@L("SenderLogin_InvalidCredentials_Body", "Benutzername oder Passwort ist falsch. Bitte versuchen Sie es erneut.")</span>
                    </div>
                </div>
            } else if (LoginResult == SenderLoginResult.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-3">
                <label class="form-label fw-medium" for="login-username">
                    @L("UserName", "Benutzername")
                    <span class="text-danger ms-1">*</span>
                </label>
                <div class="input-group">
                    <span class="input-group-text bg-light">
                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="#6c757d" viewBox="0 0 16 16">
                            <path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1H3Zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6Z"/>
                        </svg>
                    </span>
                    <input id="login-username"
                           type="text"
                           class="form-control @(LoginResult == SenderLoginResult.InvalidCredentials ? "is-invalid" : null)"
                           placeholder="@L("SenderLogin_Username_Placeholder", "Benutzername eingeben")"
                           @bind="Username"
                           @bind:event="oninput"
                           @onkeydown="OnKeyDownAsync"
                           disabled="@IsLoading"
                           autocomplete="username" />
                </div>
            </div>

            <div class="mb-4">
                <label class="form-label fw-medium" for="login-password">
                    @L("Password", "Passwort")
                    <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="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>
                    <input id="login-password"
                           type="@(ShowPassword ? "text" : "password")"
                           class="form-control border-start-0 border-end-0 @(LoginResult == SenderLoginResult.InvalidCredentials ? "is-invalid" : null)"
                           placeholder="@L("SenderLogin_Password_Placeholder", "Passwort eingeben")"
                           @bind="Password"
                           @bind:event="oninput"
                           @onkeydown="OnKeyDownAsync"
                           disabled="@IsLoading"
                           autocomplete="current-password" />
                    <button type="button"
                            class="btn btn-outline-secondary border-start-0"
                            style="border-left: none;"
                            tabindex="-1"
                            @onclick="() => ShowPassword = !ShowPassword">
                        @if (ShowPassword) {
                            <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(Username) || string.IsNullOrWhiteSpace(Password))">
                @if (IsLoading) {
                    <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>
                    <span>@L("LoginInProgress", "Anmelden …")</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 fill-rule="evenodd" d="M10 3.5a.5.5 0 0 0-.5-.5h-8a.5.5 0 0 0-.5.5v9a.5.5 0 0 0 .5.5h8a.5.5 0 0 0 .5-.5v-2a.5.5 0 0 1 1 0v2A1.5 1.5 0 0 1 9.5 14h-8A1.5 1.5 0 0 1 0 12.5v-9A1.5 1.5 0 0 1 1.5 2h8A1.5 1.5 0 0 1 11 3.5v2a.5.5 0 0 1-1 0v-2z"/>
                        <path fill-rule="evenodd" d="M4.146 8.354a.5.5 0 0 1 0-.708l3-3a.5.5 0 1 1 .708.708L5.707 7.5H14.5a.5.5 0 0 1 0 1H5.707l2.147 2.146a.5.5 0 0 1-.708.708l-3-3z"/>
                    </svg>
                    <span>@L("Login", "Anmelden")</span>
                }
            </button>

        </div>

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

    </div>
</div>

@code {
    string Username = string.Empty;
    string Password = string.Empty;
    bool ShowPassword;
    bool IsLoading;
    SenderLoginResult? LoginResult;

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

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

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

        var result = await AuthService.LoginSenderAsync(Username.Trim(), Password.Trim());

        if (result == SenderLoginResult.Success) {
            Navigation.NavigateTo("/sender", 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;
    }
}