@page "/admin/faqs"
@attribute [Authorize]
@using TaxBaik.Web.Services
@using TaxBaik.Domain.Entities
@inject IFaqBrowserClient FaqClient
@inject NavigationManager Navigation
@inject IDialogService DialogService
@inject ISnackbar Snackbar

<PageTitle>FAQ 관리</PageTitle>

<section class="admin-page-hero">
    <div>
        <MudText Typo="Typo.caption" Class="admin-eyebrow">홈페이지</MudText>
        <MudText Typo="Typo.h4" Class="admin-page-title">FAQ 관리</MudText>
        <MudText Typo="Typo.body2" Class="admin-page-subtitle">홈페이지 자주 묻는 질문을 등록하고 순서를 관리합니다.</MudText>
    </div>
    <MudButton Variant="Variant.Filled" Color="Color.Primary"
               StartIcon="@Icons.Material.Filled.Add"
               Href="/taxbaik/admin/faqs/create">
        FAQ 등록
    </MudButton>
</section>

<div class="d-flex pa-4 gap-4 align-center">
    <MudTextField @bind-Value="searchQuery" Placeholder="질문 또는 답변 검색..." Adornment="Adornment.Start" 
                  AdornmentIcon="@Icons.Material.Filled.Search" IconSize="Size.Medium" Class="flex-grow-1" Immediate="true" Clearable="true" />
</div>

<AdminDataPanel Loading="@(faqs is null)" SkeletonContent="@FaqListSkeleton">
    @if (faqs is null)
    {
    }
    else if (!FilteredFaqs.Any())
    {
        <div class="pa-6 text-center">
            <MudIcon Icon="@Icons.Material.Filled.QuestionAnswer" Style="font-size:3rem; opacity:.3;" />
            <MudText Class="mt-2 text-muted">검색 조건에 맞는 FAQ가 없습니다.</MudText>
        </div>
    }
    else
    {
        <MudSimpleTable Striped="true" Dense="true" Class="admin-table">
            <thead>
                <tr>
                    <th style="width:110px;">순서</th>
                    <th>질문</th>
                    <th style="width:130px;">카테고리</th>
                    <th style="width:90px;">상태</th>
                    <th style="width:160px;"></th>
                </tr>
            </thead>
            <tbody>
                @foreach (var item in FilteredFaqs)
                {
                    <tr>
                        <td>
                            <div class="d-flex align-center justify-start gap-1">
                                <MudText Typo="Typo.body2" Class="mr-2">@item.SortOrder</MudText>
                                <MudIconButton Icon="@Icons.Material.Filled.ArrowDropUp" Size="Size.Small" OnClick="@(() => MoveUpAsync(item))" Style="padding:2px;" Dense="true" />
                                <MudIconButton Icon="@Icons.Material.Filled.ArrowDropDown" Size="Size.Small" OnClick="@(() => MoveDownAsync(item))" Style="padding:2px;" Dense="true" />
                            </div>
                        </td>
                        <td>
                            <MudText Typo="Typo.body2" Style="max-width:480px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis;">
                                @item.Question
                            </MudText>
                        </td>
                        <td>
                            @if (!string.IsNullOrEmpty(item.Category))
                            {
                                <MudChip Size="Size.Small" Color="Color.Default">@item.Category</MudChip>
                            }
                        </td>
                        <td>
                            @if (item.IsActive)
                            {
                                <MudChip Size="Size.Small" Color="Color.Success">노출 중</MudChip>
                            }
                            else
                            {
                                <MudChip Size="Size.Small" Color="Color.Default">비활성</MudChip>
                            }
                        </td>
                        <td>
                            <MudButtonGroup Size="Size.Small" Variant="Variant.Outlined">
                                <MudButton @onclick="@(() => Navigation.NavigateTo($"/taxbaik/admin/faqs/{item.Id}/edit"))">
                                     수정
                                </MudButton>
                                <MudButton Color="Color.Error" @onclick="@(() => DeleteAsync(item))">
                                     삭제
                                </MudButton>
                            </MudButtonGroup>
                        </td>
                    </tr>
                }
            </tbody>
        </MudSimpleTable>
        <MudText Typo="Typo.caption" Class="pa-2 text-muted">
            검색 결과 @(FilteredFaqs.Count())개 · 총 @(faqs.Count)개 · 노출 중 @(faqs.Count(f => f.IsActive))개
        </MudText>
    }
</AdminDataPanel>

@code {
    [CascadingParameter]
    private Task<AuthenticationState>? AuthStateTask { get; set; }

    private List<Faq>? faqs;
    private string searchQuery = "";

    private RenderFragment FaqListSkeleton => builder =>
    {
        builder.OpenComponent<AdminSkeletonRows>(0);
        builder.AddAttribute(1, "Rows", 5);
        builder.AddAttribute(2, "Columns", 4);
        builder.CloseComponent();
    };

    private IEnumerable<Faq> FilteredFaqs => faqs?
        .Where(f => string.IsNullOrEmpty(searchQuery) || 
                    f.Question.Contains(searchQuery, StringComparison.OrdinalIgnoreCase) || 
                    (f.Answer != null && f.Answer.Contains(searchQuery, StringComparison.OrdinalIgnoreCase)))
        .OrderBy(f => f.SortOrder) ?? Enumerable.Empty<Faq>();

    protected override async Task OnInitializedAsync()
    {
        if (AuthStateTask != null)
        {
            var authState = await AuthStateTask;
            if (authState.User.Identity?.IsAuthenticated == true)
            {
                await LoadAsync();
            }
        }
    }

    private async Task LoadAsync()
    {
        try
        {
            faqs = (await FaqClient.GetAllAsync()).OrderBy(f => f.SortOrder).ToList();
        }
        catch (Exception ex)
        {
            Snackbar.Add($"오류: {ex.Message}", Severity.Error);
            faqs = [];
        }
    }

    private async Task MoveUpAsync(Faq item)
    {
        if (faqs == null) return;
        var sorted = faqs.OrderBy(f => f.SortOrder).ToList();
        var index = sorted.IndexOf(item);
        if (index <= 0) return;

        var prev = sorted[index - 1];
        var temp = item.SortOrder;
        item.SortOrder = prev.SortOrder;
        prev.SortOrder = temp;

        if (item.SortOrder == prev.SortOrder)
        {
            prev.SortOrder = item.SortOrder + 1;
        }

        try
        {
            await FaqClient.UpdateAsync(item.Id, item);
            await FaqClient.UpdateAsync(prev.Id, prev);
            Snackbar.Add("순서가 상향되었습니다.", Severity.Success);
            await LoadAsync();
        }
        catch (Exception ex)
        {
            Snackbar.Add($"순서 조정 실패: {ex.Message}", Severity.Error);
        }
    }

    private async Task MoveDownAsync(Faq item)
    {
        if (faqs == null) return;
        var sorted = faqs.OrderBy(f => f.SortOrder).ToList();
        var index = sorted.IndexOf(item);
        if (index < 0 || index >= sorted.Count - 1) return;

        var next = sorted[index + 1];
        var temp = item.SortOrder;
        item.SortOrder = next.SortOrder;
        next.SortOrder = temp;

        if (item.SortOrder == next.SortOrder)
        {
            next.SortOrder = item.SortOrder + 1;
        }

        try
        {
            await FaqClient.UpdateAsync(item.Id, item);
            await FaqClient.UpdateAsync(next.Id, next);
            Snackbar.Add("순서가 하향되었습니다.", Severity.Success);
            await LoadAsync();
        }
        catch (Exception ex)
        {
            Snackbar.Add($"순서 조정 실패: {ex.Message}", Severity.Error);
        }
    }

    private async Task DeleteAsync(Faq item)
    {
        var confirmed = await DialogService.ShowMessageBox(
            "FAQ 삭제",
            $"'{item.Question}' 항목을 삭제하시겠습니까?",
            yesText: "삭제", cancelText: "취소");

        if (confirmed != true) return;

        try
        {
            var success = await FaqClient.DeleteAsync(item.Id);
            if (success)
            {
                Snackbar.Add("FAQ가 삭제되었습니다.", Severity.Success);
                await LoadAsync();
            }
            else
            {
                Snackbar.Add("삭제 실패", Severity.Error);
            }
        }
        catch (Exception ex)
        {
            Snackbar.Add($"오류: {ex.Message}", Severity.Error);
        }
    }
}