@page "/subnets"
@using RackPeek.Domain.Persistence
@using RackPeek.Domain.Resources
@inject IResourceCollection ResourceCollection

<div class="min-h-screen bg-zinc-950 text-zinc-200 font-mono p-6 space-y-6"
     data-testid="subnet-browser-root">

    <h1 class="text-lg text-zinc-100"
        data-testid="subnet-browser-title">
        Subnet Browser
    </h1>

    <!-- Filter -->
    <div>
        <input
            data-testid="subnet-browser-filter"
            placeholder="Filter by IP (e.g. 10.0.99)"
            class="w-full px-3 py-2 rounded-md
           bg-zinc-800 text-zinc-100
           border border-zinc-700
           focus:outline-none focus:ring-2 focus:ring-emerald-500"
            @bind="Filter"
            @bind:event="oninput" />
    </div>

    @if (_grouped is null)
    {
        <div class="text-zinc-500"
             data-testid="subnet-browser-loading">
            loading…
        </div>
    }
    else if (!_grouped.Any())
    {
        <div class="text-zinc-500"
             data-testid="subnet-browser-empty">
            no matching IPs found
        </div>
    }
    else
    {
        <div class="space-y-6"
             data-testid="subnet-browser-list">

            @foreach (var subnetGroup in _grouped.OrderBy(x => x.Key))
            {
                <div data-testid=@($"subnet-group-{subnetGroup.Key.Replace('.', '-')}")>

                    <!-- Subnet Header -->
                    <div class="text-xs text-zinc-500 uppercase tracking-wider mb-3">
                        @subnetGroup.Key
                    </div>

                    <ul class="ml-2 border-l border-zinc-800 pl-4 space-y-3">
                        @foreach (var ipGroup in subnetGroup.Value.OrderBy(x => x.Key))
                        {
                            <li>

                                <!-- IP -->
                                <div class="text-zinc-100">
                                    ├─ @ipGroup.Key
                                </div>

                                <!-- Resources on this IP -->
                                <ul class="ml-4 mt-2 border-l border-zinc-800 pl-4 space-y-1">
                                    @foreach (var (resource, _) in ipGroup.Value)
                                    {
                                        var url = GetResourceUrl(resource);

                                        <li class="text-zinc-500 hover:text-emerald-300">
                                            <NavLink href="@url" class="block">
                                                └─ @resource.Name (@resource.GetType().Name.Replace("Resource",""))
                                            </NavLink>
                                        </li>
                                    }
                                </ul>
                            </li>
                        }
                    </ul>

                </div>
            }

        </div>
    }
</div>
@code {

    private string _filter = string.Empty;

    private IReadOnlyList<(Resource resource, string ip)> _all = [];

    private Dictionary<string, Dictionary<string, List<(Resource, string)>>>? _grouped;

    protected override async Task OnInitializedAsync()
    {
        _all = await ResourceCollection.GetResourceIpsAsync();
        ApplyFilter();
    }

    private string Filter
    {
        get => _filter;
        set
        {
            if (_filter == value)
                return;

            _filter = value;
            ApplyFilter();
        }
    }

    private void ApplyFilter()
    {
        var filtered = string.IsNullOrWhiteSpace(_filter)
            ? _all
            : _all.Where(x =>
                    x.ip.Contains(_filter, StringComparison.OrdinalIgnoreCase))
                .ToList();

        _grouped = filtered
            .Where(x => !string.IsNullOrWhiteSpace(x.ip))
            .GroupBy(x => GetSubnet(x.ip))
            .ToDictionary(
                g => g.Key,
                g => g.GroupBy(x => x.ip)
                    .ToDictionary(
                        ip => ip.Key,
                        ip => ip.ToList()
                    )
            );

        StateHasChanged();
    }

    private string GetSubnet(string ip)
    {
        var parts = ip.Split('.');
        return parts.Length == 4
            ? $"{parts[0]}.{parts[1]}.{parts[2]}.x"
            : "unknown";
    }

    private string GetResourceUrl(Resource resource)
    {
        return resource switch
        {
            RackPeek.Domain.Resources.SystemResources.SystemResource
                => $"resources/systems/{Uri.EscapeDataString(resource.Name)}",

            RackPeek.Domain.Resources.Services.Service
                => $"resources/services/{Uri.EscapeDataString(resource.Name)}",

            _ => "#"
        };
    }
}