local sim_objects_registry = nil
local props_ini = ini_file("misc\\simulation_objects_props.ltx")

class "simulation_objects_registry"

function simulation_objects_registry:__init()
	self.objects = {}
end

function simulation_objects_registry:register(obj)
	self:get_props(obj)
	self:update_avaliability(obj)
end

function simulation_objects_registry:update_avaliability(obj)
	if xr_logic.pick_section_from_condlist(db.actor or alife():actor(), obj, obj.sim_avail) == "true" and obj:sim_available() then
		self.objects[obj.id] = obj
	else
		self.objects[obj.id] = nil
	end
end

function simulation_objects_registry:get_props(obj)
	obj.props		= {}
	local props_section = obj:name()
	if obj:clsid() == clsid.online_offline_group_s then
		props_section = obj:section_name()
	end
	if not props_ini:section_exist(props_section) then
--		abort("!!!!Warning : object [%s] has no simulation props section!!!!!!!!!!!!!!!!", obj:name())
		props_section = "default"
		if obj:clsid() == clsid.online_offline_group_s then
			props_section = "default_squad"
		end
		if obj:clsid() == clsid.script_actor then
			props_section = "actor"
		end
	end
	local n = props_ini:line_count(props_section)
	for j=0,n-1 do
		local result, prop_name, prop_condlist = props_ini:r_line(props_section,j,"","")
		if prop_name == "sim_avail" then
			obj.sim_avail = xr_logic.parse_condlist(nil, "simulation_object", "sim_avail", prop_condlist)
		else
			obj.props[prop_name] = prop_condlist
		end
	end
	if obj.sim_avail == nil then
		obj.sim_avail = xr_logic.parse_condlist(nil, "simulation_object", "sim_avail", "true")
	end
end

function simulation_objects_registry:unregister(obj)
	self.objects[obj.id] = nil
end

function get_sim_obj_registry()
	if sim_objects_registry == nil then
		sim_objects_registry = simulation_objects_registry()
	end
	return sim_objects_registry
end

--***********************************************************************************************
--*										SIMULATION_LOCAL_FUNCTIONS								*
--***********************************************************************************************


function sim_dist_to(obj1 , obj2)
	local pos1,lv1,gv1 = obj1:get_location()
	local pos2,lv2,gv2 = obj2:get_location()
	return utils.graph_distance(gv1, gv2)
end

local function evaluate_prior_by_dist(target, squad)
	local dist = sim_dist_to(target, squad)
	if dist < 1 then
		dist = 1
	end
	return 1 + 1/dist
end

function is_on_the_same_level(obj1, obj2)
	return game_graph():vertex(obj1.m_game_vertex_id):level_id() == game_graph():vertex(obj2.m_game_vertex_id):level_id()
end

function evaluate_prior(target, squad)
	local prior = 0
	if not target:target_precondition(squad) or not is_on_the_same_level(target, squad) then
		return prior
	else
		prior = 3
	end
	for k,v in pairs (squad.behaviour) do
		local squad_koeff = tonumber(v)
		local target_koeff = 0
		if target.props[k] ~= nil then
			target_koeff = tonumber(target.props[k])
		end
		prior = prior + squad_koeff*target_koeff
	end
	return prior*evaluate_prior_by_dist(target, squad)
end


--***********************************************************************************************
--*										DEBUG_FUNCTIONS								
--***********************************************************************************************