using Unity.Collections;
using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Connection intent for the M4 LAN host/join flow. Lives in Simulation so both the server and
    /// client worlds can read it. A UI (the UITK frontend menu via <c>WorldLauncher</c>) — or, in the editor, the auto-host system —
    /// writes the desired <see cref="Mode"/> + endpoint and sets <see cref="Requested"/> true; the
    /// per-world ConnectionControlSystem turns it into a netcode <c>NetworkStreamRequestListen</c> /
    /// <c>NetworkStreamRequestConnect</c> and clears <see cref="Requested"/>. Direct IP/LAN only for now —
    /// Unity Relay is deferred to a later pass. Created per-world as a singleton.
    /// </summary>
    /// <summary>Connection intent values (byte-const, matching the project's op/id convention — not an enum, so
    /// they stay safe if a consumer is ever [BurstCompile]d). Written to <see cref="ConnectionConfig.Mode"/>.</summary>
    public static class ConnectionMode
    {
        public const byte None = 0;
        public const byte Host = 1;
        public const byte Join = 2;
    }

    public struct ConnectionConfig : IComponentData
    {
        /// <summary>What to do with this world's network stream.</summary>
        public byte Mode;

        /// <summary>Dotted IPv4 to connect to (Join). Ignored for Host (binds AnyIpv4).</summary>
        public FixedString64Bytes Address;

        /// <summary>Listen/connect port.</summary>
        public ushort Port;

        /// <summary>Set true to request the control system act on Mode this frame; it clears the flag.</summary>
        public bool Requested;
    }
}