using NeonSprawl.Server.Game.Npc;
using NeonSprawl.Server.Game.PositionState;
using NeonSprawl.Server.Game.World;

namespace NeonSprawl.Server.Game.Combat;

/// <summary>Deterministic NPC telegraph-complete damage resolve (NEO-95 / NEO-98).</summary>
public static class NpcAttackOperations
{
    /// <summary>
    /// Applies catalog ability <c>baseDamage</c> to <paramref name="holderPlayerId"/> when the threat row still
    /// names that holder for <paramref name="npcInstanceId"/> and the holder is within the attack ability's
    /// <see cref="AbilityDefRow.MaxRange"/> of the NPC anchor.
    /// </summary>
    public static bool TryResolveTelegraphComplete(
        string npcInstanceId,
        string holderPlayerId,
        string attackAbilityId,
        IAbilityDefinitionRegistry abilityRegistry,
        IPositionStateStore positionStore,
        IPlayerCombatHealthStore playerHealthStore,
        IThreatStateStore threatStore)
    {
        if (!abilityRegistry.TryGetDefinition(attackAbilityId, out var ability))
        {
            return false;
        }

        if (ability.BaseDamage <= 0)
        {
            return true;
        }

        if (string.IsNullOrWhiteSpace(holderPlayerId) ||
            !threatStore.TryGet(npcInstanceId, out var threat) ||
            string.IsNullOrEmpty(threat.AggroHolderPlayerId) ||
            !string.Equals(threat.AggroHolderPlayerId, holderPlayerId, StringComparison.Ordinal))
        {
            return false;
        }

        if (!IsHolderWithinAbilityMaxRange(npcInstanceId, holderPlayerId, ability.MaxRange, positionStore))
        {
            return false;
        }

        if (!playerHealthStore.TryApplyDamage(holderPlayerId, ability.BaseDamage, out var snapshot))
        {
            return false;
        }

        if (snapshot.Defeated)
        {
            // TODO(E9.M1): player_death
        }

        return true;
    }

    internal static bool IsHolderWithinAbilityMaxRange(
        string npcInstanceId,
        string holderPlayerId,
        double maxRange,
        IPositionStateStore positionStore)
    {
        if (maxRange <= 0 ||
            !PrototypeNpcRegistry.TryGet(npcInstanceId, out var entry) ||
            !positionStore.TryGetPosition(holderPlayerId, out var playerSnap))
        {
            return false;
        }

        return HorizontalReach.IsWithinHorizontalRadius(
            playerSnap.X,
            playerSnap.Z,
            entry.X,
            entry.Z,
            maxRange);
    }
}