local PROJECTILE_LIFE_TIME = 30

local SHADOW_PROJECTILE_TOOL_PROPERTIES = {
	full_punch_interval = 0.0,
	damage_groups = { fleshy = 1 },
}

local impact_particles = function(mob)
	minetest.add_particlespawner({
		amount = 12,
		time = 0.05,
		exptime = {
			min = 0.7,
			max = 1.4,
		},
		size = 1,
		pos = mob.object:get_pos(),
		vel = {
			min = vector.new(-2, -2, -2),
			max = vector.new(2, 2, 2),
		},
		drag = vector.new(5, 5, 5),
		texture = {
			name = "sf_particles_shadow_poof_anim.png",
		},
		animation = {
			type = "vertical_frames",
			aspect_w = 16,
			aspect_h = 16,
			length = -1,
		},
	})
end

minetest.register_entity("sf_projectiles:shadow", {
	initial_properties = {
		visual = "cube",
		physical = true,
		collides_with_objects = true,
		textures = {
			"sf_projectiles_shadow.png",
			"sf_projectiles_shadow.png",
			"sf_projectiles_shadow.png",
			"sf_projectiles_shadow.png",
			"sf_projectiles_shadow.png",
			"sf_projectiles_shadow.png",
		},
		collisionbox = { -0.125, -0.125, -0.125, 0.125, 0.125, 0.125 },
		selectionbox = { -0.125, -0.125, -0.125, 0.125, 0.125, 0.125, rotate = true },
		visual_size = { x = 0.25, y = 0.25, z = 0.25 },
	},
	_life_timer = 0,
	on_activate = function(self, staticdata)
		self.object:set_armor_groups({immortal=1})
		-- DEBUG: default speed
		self.object:set_velocity({x=9,y=0,z=0})
	end,
	on_deactivate = function(self, removal)
		if removal then
		end
	end,
	on_step = function(self, dtime, moveresult)
		local opos = self.object:get_pos()
		if moveresult.collides then
			for c=1, #moveresult.collisions do
				local collision = moveresult.collisions[c]
				if collision.type == "object" then
					if collision.object:is_player() then
						local dir = vector.direction(opos, collision.object:get_pos())
						collision.object:punch(self.object, math.huge, SHADOW_PROJECTILE_TOOL_PROPERTIES, dir)
					end
					impact_particles(self)
					self.object:remove()
					return
				elseif collision.type == "node" then
					impact_particles(self)
					self.object:remove()
					return
				end
			end
		end
		self._life_timer = self._life_timer + dtime
		if self._life_timer > PROJECTILE_LIFE_TIME then
			self.object:remove()
			return
		end
	end,
})