using SVSim.BattleNode.Sessions;

namespace SVSim.BattleNode.Bridge;

/// <summary>
/// In-process implementation of <see cref="IMatchingBridge"/>. The HTTP-side
/// <c>do_matching</c> controller calls <see cref="RegisterPendingBattle"/>, which mints a
/// 12-digit decimal battle id, stashes a <see cref="PendingBattle"/> entry in the
/// <see cref="IBattleSessionStore"/>, and returns the node URL the client should connect to.
/// The WebSocket handler resolves the same battle id back to the viewer on connect.
/// </summary>
public sealed class MatchingBridge : IMatchingBridge
{
    private readonly IBattleSessionStore _store;
    private readonly BattleNodeOptions _options;

    public MatchingBridge(IBattleSessionStore store, BattleNodeOptions options)
    {
        _store = store;
        _options = options;
    }

    public PendingMatch RegisterPendingBattle(long viewerId)
    {
        // 12-digit decimal battle id mirrors the captures (e.g. "975695075012").
        // Cast to long before Math.Abs to avoid OverflowException on int.MinValue.
        var battleId = (Math.Abs((long)Guid.NewGuid().GetHashCode()) % 1_000_000_000_000L).ToString("D12");
        _store.RegisterPending(new PendingBattle(battleId, viewerId));
        return new PendingMatch(battleId, _options.NodeServerUrl);
    }
}