@using Sandbox;
@using Sandbox.UI;
@using Sandbox.UI.Navigation;
@using Machines.Components;
@using Machines.Resources;

@namespace Machines.UI
@inherits Panel

@{
    var flow = LobbyFlow.Current;
    var map = flow?.SelectedMap;

    var total = Connection.All.Count;
    var ready = ReadyCount();
}

<root class="lobby-status @(Visible ? "" : "hidden") @(Input.UsingController ? "controller" : "mouse")" onclick=@GoToPlay>
    @if ( Visible )
    {
        <div class="ls-map">
            <div class="ls-thumb-wrap">
                <image @ref="ThumbImage" class="ls-thumb" />
                @if ( map?.Thumbnail == null )
                {
                    <div class="ls-thumb-empty">NO IMAGE</div>
                }
            </div>
            <div class="ls-map-info">
                <span class="ls-eyebrow">IN LOBBY</span>
                <span class="ls-title">@(map?.Title ?? "No map")</span>
            </div>
        </div>

        <PlayerSlots class="ls-slots" />

        <div class="ls-status">
            <span class="ls-state">@StateLabel( flow )</span>
            <span class="ls-ready">@ready / @System.Math.Max( total, 1 ) READY</span>
        </div>
    }
</root>

@code
{
    public Sandbox.UI.Image ThumbImage { get; set; }

    // Show when a lobby exists, except on /play which shows the full picker.
    private bool Visible =>
        LobbyFlow.Current is not null
        && MainMenuPanel.Instance?.CurrentUrl != "/play";

    public override void Tick()
    {
        base.Tick();

        if ( ThumbImage != null )
            ThumbImage.Texture = LobbyFlow.Current?.SelectedMap?.Thumbnail;

        StackAbovePatchNotes();
    }

    // Sit above the patch-notes card; explicit px so the CSS transition works both ways.
    private void StackAbovePatchNotes()
    {
        var revision = FindRootPanel()?.Descendants.OfType<RevisionCard>().FirstOrDefault();
        var cardHeight = revision is not null && revision.IsVisible
            ? revision.Box.Rect.Height * ScaleFromScreen + 14f
            : 0f;

        // Nudge up on the main menu home page so it clears the home layout.
        var menuOffset = MainMenuPanel.Instance?.CurrentUrl == "/home" ? 32f : 0f;

        Style.Bottom = Length.Pixels( 56f + cardHeight + menuOffset ); // $deadzone-y (+ card + gap)
    }

    // Click navigates back to the map selector.
    private void GoToPlay()
    {
        this.Navigate( "/play" );
    }

    private static string StateLabel( LobbyFlow flow )
    {
        if ( flow == null )
            return "WAITING";

        return flow.State switch
        {
            LobbyState.Countdown => $"STARTING IN {System.Math.Max( 0, (int)System.Math.Ceiling( (float)flow.CountdownEnds ) )}…",
            LobbyState.Launching => "STARTING…",
            _ => "WAITING"
        };
    }

    private static int ReadyCount()
    {
        var flow = LobbyFlow.Current;
        if ( flow == null )
            return 0;

        return Connection.All.Count( c => flow.Ready.TryGetValue( c.Id, out var r ) && r );
    }

    protected override int BuildHash()
    {
        var flow = LobbyFlow.Current;
        var countdownTick = flow?.State == LobbyState.Countdown ? (int)((float)flow.CountdownEnds * 4) : 0;

        return System.HashCode.Combine(
            Visible,
            flow?.SelectedMapIdent,
            flow?.State,
            Connection.All.Count,
            ReadyCount(),
            countdownTick,
            Input.UsingController );
    }
}