using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Marker on a runtime-spawned EXPEDITION combat enemy (a Husk variant the server's ZoneEnemyDirectorSystem
    /// instantiates in the expedition region). Distinguishes zone enemies from base-siege Husks for the single
    /// teardown point in ExpeditionFieldSystem and for the per-epoch clear count. Zone enemies ALSO keep
    /// <c>EnemyTag</c> + <c>RegionTag{Expedition}</c>, so Slice-1 readability/health-bars/telegraphs/damage and the
    /// per-region AI target filter all work for them unchanged.
    /// </summary>
    public struct ZoneEnemyTag : IComponentData { }

    /// <summary>
    /// Baked config for the expedition zone-enemy director (one singleton in the gameplay subscene; the server-only
    /// ZoneEnemyDirectorSystem reads it). One epoch-seeded wave per sortie: a <see cref="GruntsPerWave"/> +
    /// <see cref="ChargersPerWave"/> baseline that shifts grunt-&gt;charger as the expedition epoch climbs (the
    /// highest-leverage variety lever), spawned one every <see cref="SpawnIntervalTicks"/> at a deterministic ring of
    /// <see cref="RingSlots"/> slots / <see cref="RingRadius"/> around the expedition origin, capped at
    /// <see cref="MaxAlive"/> concurrent (the v1 ghost-relevancy mitigation). On a real clear the returning player
    /// banks <see cref="RewardOre"/> to the shared ledger, once per epoch.
    /// </summary>
    public struct ZoneEnemyDirector : IComponentData
    {
        public int MaxAlive;
        public float RingRadius;
        public int RingSlots;
        public int SpawnIntervalTicks;
        public int GruntsPerWave;
        public int ChargersPerWave;
        public int RewardOre;
    }

    /// <summary>
    /// Baked pool of zone-enemy prefab variants the director draws from by composition. Index 0 = Grunt variant,
    /// index 1 = Charger variant (see <see cref="ZoneEnemyMath.IsChargerSlot"/>). Aliases the existing Husk ghost
    /// prefabs so zone enemies reuse the whole combat/readability stack with no new ghost type.
    /// </summary>
    public struct ZoneEnemyPrefab : IBufferElementData
    {
        public Entity Prefab;
    }

    /// <summary>
    /// Runtime state of the zone-enemy director (server-only singleton; NOT replicated). Tracks its OWN spawn
    /// counter (never WaveState.SpawnCounter), how many enemies remain to spawn for the current epoch's wave, the
    /// next spawn tick, and the epoch the current wave was seeded for (re-syncs when CycleRuntime.ExpeditionEpoch
    /// bumps). All session-scoped: 0-defaults safely on load (no SaveData field — DR-040 defers SaveData v6).
    /// </summary>
    public struct ZoneEnemyState : IComponentData
    {
        public uint SpawnCounter;
        public int RemainingToSpawn;
        public uint NextSpawnTick;
        public int SeededEpoch;
    }
}