core.register_entity("pyutest_fireworks:firework", {
  initial_properties = {
    visual = "upright_sprite",
    textures = { "pyutest-firework.png", "pyutest-firework.png" },
    physical = true,
    glow = core.LIGHT_MAX
  },

  on_activate = function(self)
    self.object:set_velocity(vector.new(0, 12, 0))
  end,

  on_step = function(self, dtime)
    local vel = self.object:get_velocity()
    if vel.y < 0 then
      self:explode()
      self.object:remove()
      return
    end

    vel.y = vel.y - 5 * dtime
    self.object:set_velocity(vel)
    self:trail()
  end,

  trail = function(self)
    local pos = self.object:get_pos() - vector.new(0, 1, 0)
    local velocity = vector.new(math.random(-1, 1), 0, math.random(-1, 1))

    if math.random(1, 2) == 1 then
      core.add_particle({
        pos = pos,
        size = 1.2,
        expirationtime = 0.6,
        glow = core.LIGHT_MAX,
        vertical = true,
        velocity = velocity,
        collisiondetection = true,
        collision_removal = true,
        texture = "pyutest-firework-trail1.png"
      })
    else
      core.add_particle({
        pos = pos,
        size = 1.2,
        expirationtime = 0.6,
        glow = core.LIGHT_MAX,
        vertical = true,
        velocity = velocity,
        collisiondetection = true,
        collision_removal = true,
        texture = "pyutest-firework-trail2.png"
      })
    end
  end,

  explode = function(self)
    local color = {
      r = math.random(50, 255),
      g = math.random(50, 255),
      b = math.random(50, 255),
    }
    local texture = string.format("pyutest-firework-blast.png^[colorize:%s", core.colorspec_to_colorstring(color))

    local pos = self.object:get_pos()

    for v in core.objects_inside_radius(pos, 3) do
      if v ~= self.object then
        PyuTest.deal_damage(v, 9, PyuTest.DAMAGE_TYPES.fireworks())
      end
    end

    core.add_particlespawner({
      amount = math.random(20, 40),
      time = 0.8,
      minexptime = 0.4,
      maxexptime = 1.4,
      minsize = 2,
      maxsize = 2,
      vertical = false,
      glow = core.LIGHT_MAX,

      collisiondetection = false,
      texture = texture,
      minpos = pos,
      maxpos = pos,
      minvel = vector.new(-6, -6, -6),
      maxvel = vector.new(6, 6, 6),
    })

    core.sound_play("pyutest-firework", {
      gain = 1.2,
      pos = pos,
    })
  end
})

PyuTest.make_item("pyutest_fireworks:firework", "Firework", {}, "pyutest-firework.png", {
  on_place = function(itemstack, placer, pointed_thing)
    if pointed_thing.type == "node" then
      local pos = pointed_thing.above
      core.add_entity(pos, "pyutest_fireworks:firework")
      itemstack:take_item()
    end

    return itemstack
  end,
  __on_dispense = function (pos, itemstack)
    core.add_entity(pos, "pyutest_fireworks:firework")
    itemstack:take_item()

    return itemstack
  end
})