@page "/login"
@attribute [AllowAnonymous]
@layout AuthLayout
@inject AuthenticationStateProvider AuthStateProvider
@inject NavigationManager NavigationManager
@inject HttpClient Http

<PageTitle>로그인 - QuantEngine</PageTitle>

<MudContainer MaxWidth="MaxWidth.False" Class="login-shell">
    <MudPaper Class="login-card pa-8" Elevation="10">
        <MudStack AlignItems="AlignItems.Center" Spacing="2" Class="mb-6">
            <MudAvatar Size="Size.Large" Color="Color.Primary">Q</MudAvatar>
            <MudText Typo="Typo.h4">QuantEngine</MudText>
            <MudText Typo="Typo.body2" Align="Align.Center">은퇴자산포트폴리오 투자 관리 시스템</MudText>
        </MudStack>

        <MudStack Spacing="2">
            <MudTextField Label="관리자 아이디" @bind-Value="Username" Variant="Variant.Outlined" Immediate="true" AutoFocus="true" />
            <MudTextField Label="비밀번호" @bind-Value="Password" Variant="Variant.Outlined" InputType="InputType.Password" Immediate="true" />
            <MudCheckBox T="bool" @bind-Checked="RememberUsername" Color="Color.Primary" Label="아이디 저장" />

            @if (!string.IsNullOrEmpty(ErrorMessage))
            {
                <MudAlert Severity="Severity.Error">@ErrorMessage</MudAlert>
            }

            <MudButton Variant="Variant.Filled" Color="Color.Primary" FullWidth="true" Disabled="@IsSubmitting" OnClick="HandleLoginAsync">
                @(IsSubmitting ? "인증 중..." : "로그인")
            </MudButton>
        </MudStack>
    </MudPaper>
</MudContainer>

<style>
    .login-shell {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        background:
            radial-gradient(circle at top left, rgba(0, 242, 254, 0.08), transparent 30%),
            radial-gradient(circle at bottom right, rgba(79, 172, 254, 0.1), transparent 35%),
            linear-gradient(135deg, #090a15 0%, #12142d 100%);
    }

    .login-card {
        width: min(480px, calc(100vw - 32px));
        border-radius: 20px;
        background: rgba(255, 255, 255, 0.04);
        backdrop-filter: blur(24px);
        color: white;
    }
</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 bool RememberUsername { get; set; } = true;

    protected override async Task OnInitializedAsync()
    {
        var customProvider = (CustomAuthenticationStateProvider)AuthStateProvider;
        var remembered = await customProvider.GetRememberedUsernameAsync();
        if (!string.IsNullOrWhiteSpace(remembered))
        {
            Username = remembered;
            RememberUsername = true;
        }
    }

    private sealed class LoginResponse
    {
        public bool Success { get; set; }
        public string? Username { get; set; }
        public string? Role { get; set; }
        public string? AccessToken { get; set; }
        public string? ExpiresAt { get; set; }
    }

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

        IsSubmitting = true;

        try
        {
            var response = await Http.PostAsJsonAsync("api/auth/login", new { Username, Password });
            if (response.IsSuccessStatusCode)
            {
                var auth = await response.Content.ReadFromJsonAsync<LoginResponse>();
                if (auth is null || string.IsNullOrWhiteSpace(auth.AccessToken))
                {
                    ErrorMessage = "로그인 응답이 유효하지 않습니다.";
                    return;
                }

                var customProvider = (CustomAuthenticationStateProvider)AuthStateProvider;
                await customProvider.MarkUserAsAuthenticatedAsync(auth.Username ?? Username, auth.AccessToken, auth.Role ?? "Admin", RememberUsername);
                NavigationManager.NavigateTo("/dashboard");
            }
            else
            {
                ErrorMessage = "아이디 또는 비밀번호가 올바르지 않습니다.";
            }
        }
        catch (Exception ex)
        {
            ErrorMessage = $"로그인 중 오류가 발생했습니다: {ex.Message}";
        }
        finally
        {
            IsSubmitting = false;
        }
    }
}