@page "/login"
@attribute [AllowAnonymous]
@inject AuthenticationStateProvider AuthStateProvider
@inject NavigationManager NavigationManager
@inject IConfiguration Configuration

<PageTitle>로그인 - QuantEngine</PageTitle>

<div class="auth-container">
    <div class="auth-card">
        <div class="brand-section">
            <img src="images/quant_engine_logo.jpg" alt="QuantEngine Logo" class="brand-logo" />
            <h1 class="brand-title">QuantEngine</h1>
            <p class="brand-subtitle">은퇴자산포트폴리오 투자 관리 시스템</p>
        </div>

        <form @onsubmit="HandleLoginAsync" class="auth-form">
            <div class="form-group">
                <label for="username">관리자 아이디</label>
                <input type="text" id="username" class="form-control" @bind="Username" placeholder="아이디를 입력하세요" autocomplete="username" />
            </div>

            <div class="form-group">
                <label for="password">비밀번호</label>
                <input type="password" id="password" class="form-control" @bind="Password" placeholder="비밀번호를 입력하세요" autocomplete="current-password" />
            </div>

            @if (!string.IsNullOrEmpty(ErrorMessage))
            {
                <div class="error-message">
                    <svg class="error-icon" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
                    </svg>
                    <span>@ErrorMessage</span>
                </div>
            }

            <button type="submit" class="btn-submit" disabled="@IsSubmitting">
                @if (IsSubmitting)
                {
                    <span class="spinner"></span>
                    <span>인증 중...</span>
                }
                else
                {
                    <span>로그인</span>
                }
            </button>
        </form>
    </div>
</div>

<style>
    .auth-container {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 100vh;
        width: 100vw;
        background: linear-gradient(135deg, #090a15 0%, #12142d 100%);
        font-family: 'Roboto', 'Inter', sans-serif;
        color: #ffffff;
        position: fixed;
        top: 0;
        left: 0;
        z-index: 9999;
        overflow: hidden;
    }

    /* Ambient background glow */
    .auth-container::before {
        content: "";
        position: absolute;
        width: 600px;
        height: 600px;
        background: radial-gradient(circle, rgba(0, 242, 254, 0.08) 0%, rgba(79, 172, 254, 0) 70%);
        top: -10%;
        left: -10%;
        pointer-events: none;
    }

    .auth-container::after {
        content: "";
        position: absolute;
        width: 600px;
        height: 600px;
        background: radial-gradient(circle, rgba(79, 172, 254, 0.08) 0%, rgba(0, 242, 254, 0) 70%);
        bottom: -10%;
        right: -10%;
        pointer-events: none;
    }

    .auth-card {
        background: rgba(255, 255, 255, 0.02);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border: 1px solid rgba(255, 255, 255, 0.06);
        border-radius: 20px;
        padding: 48px;
        width: 440px;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
        display: flex;
        flex-direction: column;
        align-items: center;
        z-index: 10;
        animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .brand-section {
        text-align: center;
        margin-bottom: 36px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .brand-logo {
        width: 80px;
        height: 80px;
        border-radius: 50%;
        object-fit: cover;
        border: 2px solid rgba(0, 242, 254, 0.3);
        box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
        margin-bottom: 16px;
        transition: transform 0.3s ease;
    }

    .brand-logo:hover {
        transform: rotate(5deg) scale(1.05);
    }

    .brand-title {
        font-size: 26px;
        font-weight: 700;
        margin: 0;
        background: linear-gradient(90deg, #00f2fe 0%, #4facfe 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        letter-spacing: 0.5px;
    }

    .brand-subtitle {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.5);
        margin: 6px 0 0 0;
        font-weight: 300;
    }

    .auth-form {
        width: 100%;
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    .form-group {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .form-group label {
        font-size: 13px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.8);
        padding-left: 2px;
    }

    .form-control {
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 10px;
        padding: 14px 16px;
        color: #ffffff;
        font-size: 14px;
        transition: all 0.3s ease;
        outline: none;
    }

    .form-control:focus {
        border-color: rgba(0, 242, 254, 0.6);
        background: rgba(255, 255, 255, 0.08);
        box-shadow: 0 0 12px rgba(0, 242, 254, 0.15);
    }

    .form-control::placeholder {
        color: rgba(255, 255, 255, 0.25);
    }

    .error-message {
        display: flex;
        align-items: center;
        gap: 10px;
        background: rgba(239, 68, 68, 0.08);
        border: 1px solid rgba(239, 68, 68, 0.2);
        border-radius: 10px;
        padding: 12px 16px;
        color: #f87171;
        font-size: 13px;
    }

    .error-icon {
        width: 18px;
        height: 18px;
        flex-shrink: 0;
    }

    .btn-submit {
        background: linear-gradient(90deg, #00f2fe 0%, #4facfe 100%);
        border: none;
        border-radius: 10px;
        padding: 14px;
        color: #0b0c15;
        font-size: 15px;
        font-weight: 700;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        transition: all 0.3s ease;
        box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
    }

    .btn-submit:hover:not(:disabled) {
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(0, 242, 254, 0.35);
    }

    .btn-submit:active:not(:disabled) {
        transform: translateY(0);
    }

    .btn-submit:disabled {
        opacity: 0.6;
        cursor: not-allowed;
        box-shadow: none;
    }

    .spinner {
        width: 16px;
        height: 16px;
        border: 2px solid rgba(11, 12, 21, 0.25);
        border-top-color: #0b0c15;
        border-radius: 50%;
        animation: spin 0.8s linear infinite;
    }

    @@keyframes spin {
        to { transform: rotate(360deg); }
    }

    @@keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
</style>

@code {
    private string Username { get; set; } = string.Empty;
    private string Password { get; set; } = string.Empty;
    private string ErrorMessage { get; set; } = string.Empty;
    private bool IsSubmitting { get; set; } = false;

    private async Task HandleLoginAsync()
    {
        ErrorMessage = string.Empty;
        if (string.IsNullOrWhiteSpace(Username) || string.IsNullOrWhiteSpace(Password))
        {
            ErrorMessage = "아이디와 비밀번호를 모두 입력해 주세요.";
            return;
        }

        IsSubmitting = true;

        try
        {
            // Verify against configurations in appsettings.json
            var expectedUser = Configuration["AdminSettings:Username"] ?? "admin";
            var expectedPass = Configuration["AdminSettings:Password"] ?? "quant123!";

            if (Username == expectedUser && Password == expectedPass)
            {
                var customProvider = (CustomAuthenticationStateProvider)AuthStateProvider;
                await customProvider.MarkUserAsAuthenticatedAsync(Username);
                
                // Redirect back to home dashboard
                NavigationManager.NavigateTo("");
            }
            else
            {
                ErrorMessage = "아이디 또는 비밀번호가 올바르지 않습니다.";
            }
        }
        catch (Exception ex)
        {
            ErrorMessage = $"로그인 중 오류가 발생했습니다: {ex.Message}";
        }
        finally
        {
            IsSubmitting = false;
        }
    }
}