function AttackWarning() {}

AttackWarning.prototype.Schema =
    "<a:component type='system'/><empty/>";

AttackWarning.prototype.Init = function()
{
    this.suppressionRange = 150;
    this.suppressionSeconds = 40;
    // Other attacks within this time and distance will not trigger the warning

    this.suppressionTransferRange = 50;
    // Any attacks within this range will replace the previous attack suppression

    this.suppressedList = [];
};

AttackWarning.prototype.NotifyAttack = function(attacker, target)
{
    var cmpPlayer = Engine.QueryInterface(this.entity, IID_Player);
    var cmpOwnership = Engine.QueryInterface(target, IID_Ownership);
    if (cmpPlayer.GetPlayerID() != cmpOwnership.GetOwner()) {
        // Only warn about people attacking me
        return;
    }

    var cmpPosition = Engine.QueryInterface(target, IID_Position);
    if (!cmpPosition || !cmpPosition.IsInWorld())
        return;
    var entityPosition = cmpPosition.GetPosition();

    var cmpTimer = Engine.QueryInterface(SYSTEM_ENTITY, IID_Timer);
    var currentTime = cmpTimer.GetTime();

    for (var i = 0; i < this.suppressedList.length; i++)
    {
        var event = this.suppressedList[i];

        // Check if the current event has timed out
        if (currentTime - event.time > 1000 * this.suppressionSeconds)
        {
            this.suppressedList.splice(i, 1);
            i--;
            continue;
        }

        // If this is within suppression distance of the event then check if the event should be updated
        // and then return
        var dist = Distance(event.position, entityPosition);
        if (dist < this.suppressionRange)
        {
            if (dist < this.suppressionTransferRange)
            {
                event.position = {x: entityPosition.x, z: entityPosition.z};
                event.time = currentTime;
            }
            return;
        }
    }

    warn("Player " + cmpPlayer.GetPlayerID() + ": You are under attack!");
    this.suppressedList.push({position:{x: entityPosition.x, z: entityPosition.z}, time: currentTime});
};

Engine.RegisterComponentType(IID_AttackWarning, "AttackWarning", AttackWarning);