@rendermode @(new InteractiveServerRenderMode(prerender: false))
@implements IAsyncDisposable
@inject ApiClientService ApiClient
@inject AuthenticationStateProvider AuthStateProvider
@inject NavigationManager Navigation
@inject IJSRuntime JS

<div class="relative">
    <button type="button"
            @onclick="ToggleOpenAsync"
            class="control-button relative">
        <i data-lucide="bell" class="h-5 w-5"></i>
        @if (UnreadCount > 0)
        {
            <span class="absolute -right-1 -top-1 flex h-4 min-w-4 items-center justify-center rounded-full bg-rose-600 px-1 text-[10px] font-bold text-white">
                @(UnreadCount > 99 ? "99+" : UnreadCount.ToString())
            </span>
        }
    </button>

    @if (IsOpen)
    {
        <div class="absolute right-0 z-50 mt-3 w-[380px] max-w-[calc(100vw-2rem)] overflow-hidden rounded-lg border border-slate-200 bg-white shadow-lg">
            <div class="flex items-center justify-between px-4 py-3 border-b border-slate-100 bg-slate-50/80">
                <div>
                    <p class="text-sm font-semibold text-slate-900">@AppLocalization.Text("notification.notifications", "Notifications")</p>
                    <p class="text-xs text-slate-500">@UnreadCount @AppLocalization.Text("notification.unread", "unread")</p>
                </div>
                <div class="flex items-center gap-2">
                    @if (Notifications.Any(item => item.IsRead))
                    {
                        <button type="button" class="text-xs font-semibold text-rose-600 hover:text-rose-700" @onclick="RequestCleanupConfirmation">
                            @AppLocalization.Text("notification.clearRead", "Clear read")
                        </button>
                    }
                    <button type="button" class="text-xs font-semibold text-violet-600 hover:text-violet-700" @onclick="RefreshAsync">
                        @AppLocalization.Text("common.refresh", "Refresh")
                    </button>
                    <button type="button" class="text-xs font-semibold text-slate-500 hover:text-slate-700" @onclick="Close">
                        @AppLocalization.Text("common.close", "Close")
                    </button>
                </div>
            </div>

            <div class="max-h-[26rem] overflow-y-auto">
                @if (IsLoading)
                {
                    <div class="p-4 text-sm text-slate-500">@AppLocalization.Text("notification.loading", "Loading notifications...")</div>
                }
                else if (Notifications.Count == 0)
                {
                    <div class="p-6 text-center">
                        <div class="mx-auto mb-3 flex h-10 w-10 items-center justify-center rounded-full bg-slate-100 text-slate-400">
                            <i data-lucide="inbox" class="h-5 w-5"></i>
                        </div>
                        <p class="text-sm font-medium text-slate-700">@AppLocalization.Text("notification.noneYet", "No notifications yet")</p>
                        <p class="text-xs text-slate-500 mt-1">@AppLocalization.Text("notification.emptyState", "Your task alerts will show up here.")</p>
                    </div>
                }
                else
                {
                    @foreach (var item in Notifications)
                    {
                        <button type="button"
                                class="w-full border-b border-slate-100 px-4 py-3 text-left transition-colors hover:bg-slate-50 @(item.IsRead ? "bg-white" : "bg-violet-50/70")"
                                @onclick="() => OpenNotificationAsync(item)">
                            <div class="flex items-start gap-3">
                                <div class="mt-0.5 flex h-9 w-9 items-center justify-center rounded-full @(item.IsRead ? "bg-slate-100 text-slate-500" : "bg-violet-100 text-violet-700")">
                                    <i data-lucide="bell-ring" class="h-4 w-4"></i>
                                </div>
                                <div class="min-w-0 flex-1">
                                    <div class="flex items-start justify-between gap-3">
                                        <p class="text-sm font-semibold text-slate-900 truncate">@item.Title</p>
                                        @if (!item.IsRead)
                                        {
                                            <span class="mt-1 h-2.5 w-2.5 rounded-full bg-violet-600 shrink-0"></span>
                                        }
                                    </div>
                                    <p class="mt-1 text-xs text-slate-600 leading-5">@item.Body</p>
                                    <div class="mt-2 flex items-center justify-between text-[11px] text-slate-400">
                                        <span>@FormatSender(item.SenderName)</span>
                                        <span>@FormatTime(item.CreatedAt)</span>
                                    </div>
                                </div>
                            </div>
                        </button>
                    }
                }
            </div>
        </div>
    }
</div>

<ConfirmDialog IsVisible="showCleanupConfirmDialog"
               Title='@AppLocalization.Text("notification.clearReadTitle", "Clear read notifications?")'
               Message='@AppLocalization.Text("notification.clearReadMessage", "This will permanently remove all read notifications from your list.")'
               ConfirmText='@AppLocalization.Text("common.clear", "Clear")'
               Icon="trash-2"
               OnConfirm="ConfirmCleanupAsync"
               OnCancel="CloseCleanupConfirmDialog" />

@code {
    private bool IsOpen;
    private bool IsLoading;
    private bool showCleanupConfirmDialog;
    private int UnreadCount;
    private List<NotificationDto> Notifications = new();

    protected override async Task OnInitializedAsync()
    {
        await RefreshAsync();
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        await JS.InvokeVoidAsync("initIcons");
    }

    private async Task ToggleOpenAsync()
    {
        IsOpen = !IsOpen;
        if (IsOpen)
        {
            await RefreshAsync();
        }
    }

    private void Close()
    {
        IsOpen = false;
    }

    private async Task RefreshAsync()
    {
        IsLoading = true;
        try
        {
            var authState = await AuthStateProvider.GetAuthenticationStateAsync();
            if (authState.User.Identity?.IsAuthenticated != true)
            {
                Notifications.Clear();
                UnreadCount = 0;
                return;
            }

            var client = ApiClient.CreateClient(authState.User);
            var unreadTask = client.GetFromJsonAsync<int>("Notification/unread-count");
            var itemsTask = client.GetFromJsonAsync<List<NotificationDto>>("Notification/mine?take=10");

            await Task.WhenAll(unreadTask, itemsTask);
            UnreadCount = unreadTask.Result;
            Notifications = (itemsTask.Result ?? new List<NotificationDto>())
                .Select(item =>
                {
                    item.TargetUrl = BuildTargetUrl(item);
                    return item;
                })
                .ToList();
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[DEBUG NotificationBell] Failed to refresh: {ex.Message}");
        }
        finally
        {
            IsLoading = false;
            await InvokeAsync(StateHasChanged);
        }
    }

    private void RequestCleanupConfirmation()
    {
        showCleanupConfirmDialog = true;
    }

    private void CloseCleanupConfirmDialog()
    {
        showCleanupConfirmDialog = false;
    }

    private async Task ConfirmCleanupAsync()
    {
        showCleanupConfirmDialog = false;
        await ClearReadNotificationsAsync();
    }

    private async Task ClearReadNotificationsAsync()
    {
        try
        {
            var authState = await AuthStateProvider.GetAuthenticationStateAsync();
            if (authState.User.Identity?.IsAuthenticated != true)
            {
                return;
            }

            var client = ApiClient.CreateClient(authState.User);
            var response = await client.DeleteAsync("Notification/read");
            if (response.IsSuccessStatusCode)
            {
                await RefreshAsync();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[DEBUG NotificationBell] Clear read notifications failed: {ex.Message}");
        }
    }

    private async Task MarkReadAsync(NotificationDto item)
    {
        if (item.IsRead)
        {
            Navigation.NavigateTo(GetTargetUrl(item));
            return;
        }

        try
        {
            var authState = await AuthStateProvider.GetAuthenticationStateAsync();
            if (authState.User.Identity?.IsAuthenticated != true)
            {
                return;
            }

            var client = ApiClient.CreateClient(authState.User);
            var response = await client.PostAsync($"Notification/{item.Id}/read", null);
            if (response.IsSuccessStatusCode)
            {
                item.IsRead = true;
                if (UnreadCount > 0)
                {
                    UnreadCount--;
                }
                await InvokeAsync(StateHasChanged);
                Navigation.NavigateTo(GetTargetUrl(item));
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[DEBUG NotificationBell] MarkRead failed: {ex.Message}");
        }
    }

    private async Task OpenNotificationAsync(NotificationDto item)
    {
        await MarkReadAsync(item);
        IsOpen = false;
    }

    private static string GetTargetUrl(NotificationDto item)
    {
        if (!string.IsNullOrWhiteSpace(item.TargetUrl))
        {
            return item.TargetUrl;
        }

        return BuildTargetUrl(item);
    }

    private static string BuildTargetUrl(NotificationDto item)
    {
        return NotificationNavigation.BuildTargetUrl(item.SourceType, item.SourceId, item.NotificationType);
    }

    private static string FormatSender(string? senderName)
    {
        return string.IsNullOrWhiteSpace(senderName) ? "System" : senderName;
    }

    private static string FormatTime(DateTime? createdAt)
    {
        if (!createdAt.HasValue)
        {
            return string.Empty;
        }

        var value = createdAt.Value.ToLocalTime();
        return value.ToString("dd MMM, HH:mm");
    }

    public ValueTask DisposeAsync() => ValueTask.CompletedTask;
}