bullets = {}


gforcemult = 1
timer = 0
Arena.resize(360, 360)

function Update()
    timer = timer + 1
    if timer > 16 then
        attractor = CreateProjectile('nova/attractor',0,0)
    end
    if timer%4==0 and timer > 16 and timer < 60 * 2 then
        bullet = 0
        dir = math.rad((timer %90))*4
        bullet = CreateProjectile('nova/pellet', math.sin(dir)*Arena.width*2/4, math.cos(dir)*Arena.width*2/4)
        table.insert(bullets, bullet)

    end
    if timer > 60*3 and gforcemult > -1 and timer < 60*4 then
        gforcemult = gforcemult -0.1
    end
    if timer > 60*4  and gforcemult < 4 then
        gforcemult = gforcemult + 0.4
    end
    if timer > 16 then
        for i=1,#bullets do -- update all bullets based on velocity
            local bullet = bullets[i]
            if bullet.isactive then
                local velx = bullet.GetVar('velx')
                local vely = bullet.GetVar('vely')
                local newposx = bullet.x + velx
                local newposy = bullet.y + vely

                bullet.MoveTo(newposx, newposy)

                xdist = attractor.x - bullet.x
                ydist = attractor.y - bullet.y

                angle = math.atan2(xdist, ydist)
                length = math.sqrt(xdist*xdist + ydist*ydist)
                power = 1/length*length

                velx = velx + power*gforcemult*xdist/length
                vely = vely + power*gforcemult*ydist/length

                if(timer < 60*3) then
                    velx = velx * (0.97 - math.max(0, 60-length)/60)
                    vely = vely * (0.97 - math.max(0, 60-length)/60)
                else
                    velx = velx * (0.97 - (0.001 * length))
                    vely = vely * (0.97 - (0.001 * length))
                end

                bullet.SetVar('velx',velx)
                bullet.SetVar('vely',vely)

            end
        end
    end
end

function OnHit(bullet)
    bullet.Remove()
    Player.Hurt(2,0.2)
    Audio.PlaySound('hit')
end