local allowed = {
    "CapsAdmin",
    "NightExcessive",
}

hook.Add("Move", "Bouncy", function(ply, data)

    if not table.HasValue(allowed, ply:Nick()) then return end
    if ply:GetMoveType() ~= MOVETYPE_WALK then return end

    local normalized = data:GetVelocity():Normalize()
    local velocity = data:GetVelocity()
    local trace = util.QuickTrace(ply:GetPos()+Vector(0,0,36), normalized*math.max(velocity:Length()/25, 50), ply)

    ---if not trace.Hit and data:GetVelocity():Length() > 1000 then debugoverlay.Line(trace.StartPos, trace.HitPos, 20, Color(255,0,0)) end

    if not ply:IsOnGround() and trace.Hit then

        debugoverlay.Line(trace.StartPos, trace.HitPos, 5, Color(0,255,0))

        --debugoverlay.Line(trace.StartPos, trace.HitPos, 3)
        local direction = velocity - 2 * ( trace.HitNormal:DotProduct( velocity ) * trace.HitNormal )

        if direction:Length() < 300 then return end

        local fraction = math.min(velocity:Length() / math.Clamp(GetConVarNumber("sv_maxvelocity"), 1000, 10000), 1)

        ply:SetGroundEntity(NULL)
        data:SetVelocity(direction*1.5)--*(fraction*2+(0.5)))

        if SERVER then
            local volume = math.Clamp(fraction*200, 100, 160)

            ply:EmitSound(("weapons/fx/rics/ric%s.wav"):format(math.random(5)), volume, math.Clamp(fraction*255+70, 70, 150))
            ply:EmitSound(("weapons/crossbow/fire1.wav"):format(math.random(5)), volume, math.Clamp(fraction*255+70, 70, 255))
            umsg.Start("bounce")
                umsg.Vector(trace.HitPos)
                umsg.Float(fraction)
                umsg.Vector(direction)
                umsg.Entity(ply)
            umsg.End()
        end
    end
end)

if CLIENT then
    local emitter = ParticleEmitter(vector_origin, false)
    usermessage.Hook("bounce", function(u)
        local pos = u:ReadVector()
        emitter:SetPos(pos)
        local fraction = u:ReadFloat()
        local force = u:ReadVector()
        local ply = u:ReadEntity()
        for i = 1, math.random(30,50) do
            local particle = emitter:Add("particle/Particle_Glow_04_Additive", (math.random()>0.5 and ply:GetPos() or pos)+(VectorRand()*25))
            particle:SetColor(255,200,150)
            particle:SetStartAlpha(50)
            particle:SetEndAlpha(0)
            particle:SetVelocity(VectorRand() * 100 + (force / 2) * fraction)
            particle:SetDieTime(math.Rand(0.3,1))
            particle:SetStartSize(0)
            particle:SetEndSize((200*fraction)+10)
            particle:SetCollide(true)
            particle:SetBounce(0.1)
            particle:SetEndLength((1000*fraction)+30)
        end
    end)
end