@using RackPeek.Domain.Persistence
@using RackPeek.Domain.Resources.Connections
@using RackPeek.Domain.Resources.Servers
@using RackPeek.Domain.Resources.SubResources
@inject IResourceCollection Repository

@if (PortGroup is null || string.IsNullOrWhiteSpace(ResourceName))
{
    <div class="text-zinc-500 text-xs">
        No ports available.
    </div>
}
else
{
    <div class="flex flex-wrap border border-zinc-800 w-fit">

        @for (var i = 0; i < PortGroup.Count; i++)
        {
            var index = i;

            var port = new PortReference
            {
                Resource = ResourceName,
                PortGroup = PortGroupIndex,
                PortIndex = index
            };

            var conn = GetConnection(port);
            var other = GetOther(conn, port);
            var isConnected = other != null;

            Port? otherGroup = null;

            if (isConnected)
            {
                otherGroup = GetDestinationPortGroup(other!);
            }

            if (isConnected)
            {
                <NavLink href="@($"resources/hardware/{Uri.EscapeDataString(other!.Resource)}")"
                         class="block">

                    <div class="@PortClass(true)">

                        <div class="text-zinc-500">
                            @(index + 1)
                        </div>

                        <div class="truncate">
                            @other!.Resource
                        </div>

                        @if (otherGroup != null)
                        {
                            <div class="text-[9px] text-zinc-400 leading-tight">
                                @otherGroup.Type — @otherGroup.Speed Gbps
                                (port @(other.PortIndex + 1) / @otherGroup.Count)
                            </div>
                        }

                    </div>

                </NavLink>
            }
            else
            {
                <button class="block text-left"
                        @onclick="() => HandlePortClick(port)">

                    <div class="@PortClass(false)">

                        <div class="text-zinc-500">
                            @(index + 1)
                        </div>

                        <div class="text-zinc-700 italic">
                            free
                        </div>

                    </div>

                </button>
            }
        }

    </div>
}

@code {

    [Parameter] public string ResourceName { get; set; } = "";
    [Parameter] public int PortGroupIndex { get; set; }
    [Parameter] public Port? PortGroup { get; set; }

    [Parameter] public EventCallback<PortReference> OnPortClicked { get; set; }

    private List<Connection> _connections = new();
    private readonly Dictionary<string, IPortResource?> _portResources = new();

    protected override async Task OnParametersSetAsync()
    {
        _connections = (await Repository.GetConnectionsAsync()).ToList();
    }

    async Task HandlePortClick(PortReference port)
    {
        if (OnPortClicked.HasDelegate)
            await OnPortClicked.InvokeAsync(port);
    }

    string PortClass(bool connected)
    {
        return $@"
            w-28
            h-12
            border-r
            border-b
            border-zinc-800
            text-[10px]
            leading-tight
            flex
            flex-col
            justify-center
            px-1
            transition
            hover:bg-zinc-800
            {(connected ? "bg-blue-950/40 text-blue-200" : "text-zinc-500")}
        ";
    }

    Connection? GetConnection(PortReference port)
    {
        return _connections.FirstOrDefault(c =>
            (c.A.Resource == port.Resource &&
             c.A.PortGroup == port.PortGroup &&
             c.A.PortIndex == port.PortIndex)
            ||
            (c.B.Resource == port.Resource &&
             c.B.PortGroup == port.PortGroup &&
             c.B.PortIndex == port.PortIndex));
    }

    PortReference? GetOther(Connection? conn, PortReference port)
    {
        if (conn == null)
            return null;

        if (conn.A.Resource == port.Resource &&
            conn.A.PortGroup == port.PortGroup &&
            conn.A.PortIndex == port.PortIndex)
            return conn.B;

        return conn.A;
    }

    Port? GetDestinationPortGroup(PortReference other)
    {
        if (!_portResources.ContainsKey(other.Resource))
        {
            var res = Repository.GetByNameAsync(other.Resource).Result;

            if (res is IPortResource pr)
                _portResources[other.Resource] = pr;
            else
                _portResources[other.Resource] = null;
        }

        var portResource = _portResources[other.Resource];

        if (portResource?.Ports == null)
            return null;

        if (other.PortGroup < 0 || other.PortGroup >= portResource.Ports.Count)
            return null;

        return portResource.Ports[other.PortGroup];
    }

}