@page "/admin/tax-filings"
@attribute [Authorize]
@using TaxBaik.Web.Services
@using TaxBaik.Domain.Entities
@inject ITaxFilingBrowserClient FilingClient
@inject IClientBrowserClient ClientClient
@inject IJSRuntime JS

<PageTitle>신고 일정 관리</PageTitle>

<section class="admin-page-hero">
    <div>
        <div class="admin-eyebrow">Tax Schedule</div>
        <h1 class="admin-page-title">신고 일정</h1>
        <p class="admin-page-subtitle">고객별 세금 신고 마감일을 관리하고 완료 처리합니다.</p>
    </div>
    <button type="button" class="site-button primary" @onclick="@(() => showAddForm = !showAddForm)">일정 추가</button>
</section>

@if (showAddForm)
{
    <div class="admin-surface mb-4">
        <h3 class="admin-section-title">새 신고 일정</h3>
        <form class="admin-dialog-card" @onsubmit="AddFiling" @onsubmit:preventDefault="true">
            <label>고객 검색
                <select class="admin-input" @bind="SelectedClientIdText">
                    <option value="">선택하세요</option>
                    @foreach (var client in clients)
                    {
                        <option value="@client.Id">@GetClientDisplayName(client)</option>
                    }
                </select>
            </label>
            <label>신고 유형
                <select class="admin-input" @bind="newFilingType">
                    <option value="">선택하세요</option>
                    @foreach (var t in TaxFilingService.FilingTypes)
                    {
                        <option value="@t">@t</option>
                    }
                </select>
            </label>
            <label>신고 기한 <input class="admin-input" type="text" placeholder="yyyy-MM-dd" @bind="DueDateText" /></label>
            <label>메모 <textarea class="admin-input" rows="3" @bind="newMemo"></textarea></label>
            <div class="admin-dialog-actions">
                <button type="submit" class="site-button primary">저장</button>
                <button type="button" class="site-button secondary" @onclick='() => showAddForm = false'>취소</button>
            </div>
        </form>
    </div>
}

<div class="admin-surface">
    <div class="admin-tabbar">
        <button type="button" class="admin-tab @(activeTab == "pending" ? "active" : "")" @onclick='() => activeTab = "pending"'>신고 예정</button>
        <button type="button" class="admin-tab @(activeTab == "filed" ? "active" : "")" @onclick='() => activeTab = "filed"'>신고 완료</button>
        <button type="button" class="admin-tab @(activeTab == "overdue" ? "active" : "")" @onclick='() => activeTab = "overdue"'>기한 초과</button>
    </div>

    @if (CurrentFilings.Count == 0)
    {
        <div class="muted">항목이 없습니다.</div>
    }
    else
    {
        <div class="admin-table-wrap">
            <table class="admin-table">
                <thead>
                    <tr>
                        <th>고객</th>
                        <th>신고 유형</th>
                        <th>기한</th>
                        <th>D-day</th>
                        <th>메모</th>
                        <th>처리</th>
                    </tr>
                </thead>
                <tbody>
                    @foreach (var filing in CurrentFilings)
                    {
                        var dday = (filing.DueDate.Date - DateTime.Today).Days;
                        <tr>
                            <td>@filing.ClientName</td>
                            <td>@filing.FilingType</td>
                            <td>@filing.DueDate.ToString("yyyy-MM-dd")</td>
                            <td>
                                @if (dday < 0)
                                {
                                    <span class="status-pill danger">D+@(-dday)</span>
                                }
                                else if (dday <= 7)
                                {
                                    <span class="status-pill warning">D-@dday</span>
                                }
                                else
                                {
                                    <span>D-@dday</span>
                                }
                            </td>
                            <td>@(filing.Memo ?? "")</td>
                            <td>
                                <div class="admin-row-actions">
                                    @if (filing.Status == "pending")
                                    {
                                        <button type="button" class="site-button secondary" @onclick="@(() => MarkFiled(filing))">완료</button>
                                    }
                                    <button type="button" class="admin-icon-button danger" @onclick="@(() => DeleteFiling(filing.Id))">✕</button>
                                </div>
                            </td>
                        </tr>
                    }
                </tbody>
            </table>
        </div>
    }
</div>

@code {
    private List<TaxFiling> allFilings = [];
    private List<Client> clients = [];
    private bool showAddForm;
    private string activeTab = "pending";
    private int selectedClientId;
    private string newFilingType = "";
    private DateTime? newDueDate = DateTime.Today.AddDays(30);
    private string newMemo = "";

    private string SelectedClientIdText { get => selectedClientId > 0 ? selectedClientId.ToString() : ""; set => selectedClientId = int.TryParse(value, out var id) ? id : 0; }
    private string DueDateText { get => newDueDate?.ToString("yyyy-MM-dd") ?? ""; set => newDueDate = DateTime.TryParse(value, out var dt) ? dt : null; }
    private List<TaxFiling> CurrentFilings => activeTab switch
    {
        "filed" => allFilings.Where(x => x.Status == "filed").ToList(),
        "overdue" => allFilings.Where(x => x.Status == "overdue").ToList(),
        _ => allFilings.Where(x => x.Status == "pending").ToList()
    };

    protected override async Task OnInitializedAsync() => await Reload();

    private async Task Reload()
    {
        try
        {
            allFilings = (await FilingClient.GetUpcomingAsync(365)).ToList();
            var (clientItems, _) = await ClientClient.GetPagedAsync(pageSize: 1000);
            clients = clientItems.ToList();
        }
        catch (Exception ex)
        {
            await JS.InvokeVoidAsync("alert", $"오류: {ex.Message}");
        }
    }

    private async Task AddFiling()
    {
        try
        {
            if (selectedClientId <= 0)
            {
                await JS.InvokeVoidAsync("alert", "고객을 선택하세요.");
                return;
            }

            var filing = new TaxFiling
            {
                ClientId = selectedClientId,
                FilingType = newFilingType,
                DueDate = newDueDate?.ToUniversalTime() ?? DateTime.UtcNow,
                Status = "pending",
                Memo = string.IsNullOrWhiteSpace(newMemo) ? null : newMemo
            };
            var result = await FilingClient.CreateAsync(filing);
            if (result != null)
            {
                showAddForm = false;
                await JS.InvokeVoidAsync("alert", "신고 일정이 추가되었습니다.");
                await Reload();
            }
            else
            {
                await JS.InvokeVoidAsync("alert", "추가 실패");
            }
        }
        catch (Exception ex)
        {
            await JS.InvokeVoidAsync("alert", $"오류: {ex.Message}");
        }
    }

    private async Task MarkFiled(TaxFiling filing)
    {
        filing.Status = "filed";
        await FilingClient.UpdateAsync(filing.Id, filing);
        await JS.InvokeVoidAsync("alert", "신고 완료 처리되었습니다.");
        await Reload();
    }

    private async Task DeleteFiling(int id)
    {
        if (!await JS.InvokeAsync<bool>("confirm", "삭제하시겠습니까?")) return;
        await FilingClient.DeleteAsync(id);
        await JS.InvokeVoidAsync("alert", "삭제되었습니다.");
        await Reload();
    }

    private static string GetClientDisplayName(Client client)
        => !string.IsNullOrWhiteSpace(client.CompanyName) ? client.CompanyName : !string.IsNullOrWhiteSpace(client.Name) ? client.Name : $"Client #{client.Id}";
}