The_End/mods/entities/defense/mob_sarangay/sarangay.lua

local c_air = minetest.get_content_id("air")
defense_mob_api.register_mob("mob_sarangay:sarangay", {
	hp_max = 30,
	collisionbox = {-0.9,-0.01,-0.9, 0.9,2.5,0.9},
	mesh = "mob_sarangay_sarangay.b3d",
	textures = {"mob_sarangay_sarangay.png"},
	makes_footstep_sound = true,
	animation = {},


	normal_animation = {
		idle = {a=0, b=19, rate=10},
		jump = {a=60, b=69, rate=15},
		fall = {a=70, b=89, rate=20},
		attack = {a=40, b=59, rate=15},
		move = {a=20, b=39, rate=20},
		move_attack = {a=40, b=50, rate=15},
	},

	charging_animation = {
		idle = {a=120, b=129, rate=10},
		jump = {a=90, b=109, rate=10},
		fall = {a=90, b=109, rate=10},
		attack = {a=40, b=59, rate=15},
		move = {a=90, b=109, rate=30},
		move_attack = {a=40, b=50, rate=15},
		start = {a=110, b=119, rate=15},
	},

	smart_path = true,
	mass = 12,
	move_speed = 6,
	jump_height = 1,
	armor = 0,
	attack_damage = 4,
	attack_range = 2.0,
	attack_interval = 1.0,
	step_height = 1.3,

	charging = false,
	charge_power = 0,
	charge_destination = nil,
	charge_cooldown = 0,
	charge_timer = 0,
	idle_sound_cd = 5,
	on_activate = function(self, staticdata)
		self:set_charging_state(self.charging)
		defense_mob_api.default_prototype.on_activate(self, staticdata)
	end,


	on_step = function(self, dtime)
		defense_mob_api.default_prototype.on_step(self, dtime)
		local pos = self.object:get_pos()
		if self.charging
		then
			self.charge_timer = self.charge_timer + 1
			if self.charge_timer > 200
			then
				self:set_charging_state(false)
			end
			self.destination = self.charge_destination


			local pos = self.object:get_pos()
			pos.y = pos.y + 1.5
			local dir = self.object:getvelocity()
			dir.y = 0
			dir = vector.multiply(vector.normalize(dir), 2)
			local front_pos = vector.add(pos, dir)

			self:crash_blocks(front_pos, 3)
			self:crash_entities(pos, 3, 10)--front


		else
			local nearest = self:find_target()
			if nearest
			then
				if nearest.distance > 4 and
					self.charge_cooldown < 1 and
					math.abs(nearest.position.y - pos.y) < 4 and
					math.random() < 0.1
				then
					self:set_charging_state(true)

				elseif nearest.distance < 4
				then
					self.charge_cooldown = 5
					self:hunt()
				else

					self.charge_cooldown = self.charge_cooldown - 1
					local dir = vector.aim(nearest.position, pos)
					self.destination = vector.add(nearest.position, vector.multiply(dir, 12))
				end
			end
		end
	end,

	set_charging_state = function(self, state)
		self.charging = state
		if state
		then
			self.move_speed = 9
			self.animation = self.charging_animation
			self:set_animation("charge")
			self:charge()
			self.destination = nil
			self.charge_timer = 0
			self:make_sound("charge", false, 2, 0.5 + (math.random() - 0.5) / 4, 32)
		else
			self.move_speed = 6
			self.animation = self.normal_animation
			self:set_animation("attack")
			self.charge_cooldown = 100
			self.charge_destination = nil
		end
	end,

	crash_blocks = function(self, pos, radius)
		local p = {x=0, y=0, z=pos.z - radius}
		for z = -radius, radius
		do
			p.y = pos.y - radius
			for y = -radius, radius
			do
				p.x = pos.x - radius
				for x = -radius, radius
				do
					if x*x + y*y + z*z <= radius
					then

						local node = minetest.get_node_or_nil(p)
						if node
						then
							local did_something = false
							local result = erosion.get_erosion_result(node.name, 4)
							if node.name ~= result
							then
								did_something = true
								minetest.set_node(p, {name = result})
							end
							if (minetest.registered_nodes[node.name] or {groups  = {}}).groups.crumbly
							then
								did_something = true
								minetest.spawn_falling_node(p)
							end
							if did_something and math.random() < 0.1
							then
								self.charge_timer = 200 --stop charging prematurely
							end
						end
					end
					p.x = p.x + 1
				end
				p.y = p.y + 1
			end
			p.z = p.z + 1
		end
	end,

	crash_entities = function(self, pos, radius, maxweight)
		local v = self.object:getvelocity()
		for _,o in ipairs(minetest.get_objects_inside_radius(pos, radius))
		do
			if o ~= self.object
			then
				o:punch(self.object, 1.0,  {
					full_punch_interval=1.0,
					damage_groups = {fleshy=1}
					}, nil)
				if math.random() < 0.01
				then
					self.charge_timer = 200 --stop charging prematurely
				end
				local e = o:get_luaentity()
				if e
				then
					o:setvelocity({x = 0, y = 3 + math.random() * vector.length(v), z = 0})
				end
			end
		end

		return maxweight
	end,


	charge = function(self)
		local nearest = self:find_target()

		if nearest.player
		then

			local pos = self.object:get_pos()
			local r = math.max(0, self.attack_range - 2)
			local dir = vector.aim(nearest.position, pos)
			self.destination = vector.add(nearest.position, vector.multiply(dir, nearest.distance * -1.3))
			self.charge_destination = self.destination
		end
	end,
})
minetest.register_alias("sarangay", "mob_sarangay:sarangay")