--[[------------------------------------------------------------------------------------------------------------------
Схема "Охотник за вертолётами"
Чугай Александр
--------------------------------------------------------------------------------------------------------------------]]

local def_attack_dist = 1000 -- расстояние, на котором вертолёт может быть атакован
local def_actor_dist  = 20  -- расстояние, на котором игрок может быть атакован

function get_nearest_heli(npc_position, attack_dist_sqr)
--	print_table(db.heli)

	local heli = nil

	for k,v in pairs(db.heli) do
		if v:position():distance_to_sqr(npc_position) <= attack_dist_sqr and
		   (heli == nil or
		   v:position():distance_to_sqr(npc_position) < heli:position():distance_to_sqr(npc_position))
		then
			heli = v
		end
	end

	return heli
end
---------------------------------------------------------------------------------------------------------------------
-- Эвалуатор свойства "можно пострелять по вертолёту"
---------------------------------------------------------------------------------------------------------------------
local overrides

class "evaluator_shoot" ( property_evaluator )

function evaluator_shoot:__init( name, a ) super( nil, name )
	self.a = a
end

function evaluator_shoot:evaluate()
	if not self.a.enabled then
		return false
	end

	overrides = xr_logic.generic_scheme_overrides( self.object )

	if overrides and overrides.heli_hunter ~= nil and
	   xr_logic.pick_section_from_condlist(db.actor, self.object, overrides.heli_hunter) ~= nil
	then
--		if self.a.heli == nil then
			-- поиск вертолета
			self.a.heli = get_nearest_heli(self.object:position(), self.a.attack_dist_sqr)
--		end

		if self.a.heli == nil then
			return false
		end

		-- Проверка на то, что вертолет еще живой.
		if not bind_heli.is_heli_alive(self.a.heli) then
			self.a.heli = nil
			return false
		end

		-- проверка не потерялся ли вертолет.
--		if db.heli[self.a.heli:id()] ~= nil and
--		printf( "dist=%d", self.a.heli:position():distance_to_sqr(self.object:position()) )
		if self.a.heli:position():distance_to_sqr(self.object:position()) > self.a.attack_dist_sqr then
			self.a.heli = nil
			return false
		end

		-- Проверка на то, что враг-игрок не подошел слишком близко
		local best_enemy = self.object:best_enemy()
		if best_enemy and
		   best_enemy:id() == db.actor:id()
		then
		    if db.actor:position():distance_to_sqr(self.object:position()) < self.a.attack_actor_sqr then
				return false
		    end
		end

		-- Проверка на то, что денжер-игрок не подошел слишком близко
		local best_danger = self.object:best_danger()
		if best_danger then
		   local bd_object = best_danger:object()
		   if bd_object ~= nil and
		      bd_object:id() == db.actor:id()
		   then
				if best_danger:position():distance_to_sqr(self.object:position()) < self.a.attack_actor_sqr then
					return false
				end
		   end
		end

		return true
	end

	return false
end

----------------------------------------------------------------------------------------------------------------------
-- Действие "стрелять по вертолёту"
----------------------------------------------------------------------------------------------------------------------
class "action_shoot" ( action_base )

function action_shoot:__init( name, a )  super ( nil, name )
	self.a = a
end

function action_shoot:initialize()
	action_base.initialize( self )

end

function action_shoot:execute()
	action_base.execute( self )

	state_mgr.set_state( self.object, "threat_fire", nil, nil,
	                     {look_object = self.a.heli})
end

function action_shoot:finalize()
	action_base.finalize( self )
end

----------------------------------------------------------------------------------------------------------------------

function add_to_binder( npc, ini, scheme, section, storage )
	--'printf( "DEBUG: add_to_binder: scheme='%s'", scheme )

	local manager = npc:motivation_action_manager()

	manager:add_evaluator( xr_evaluators_id.chugai_heli_hunter_base, evaluator_shoot( "heli_hunter", storage ) )

	local action = this.action_shoot( "action_shoot", storage )
	action:add_precondition( world_property(stalker_ids.property_alive,               true  ) )
	action:add_precondition( world_property(xr_evaluators_id.chugai_heli_hunter_base, true  ) )
	action:add_effect      ( world_property(xr_evaluators_id.chugai_heli_hunter_base, false ) )
	manager:add_action( xr_actions_id.chugai_heli_hunter_base, action )

	action = manager:action( xr_actions_id.alife )
	action:add_precondition( world_property( xr_evaluators_id.chugai_heli_hunter_base, false ) )

	action = manager:action( stalker_ids.action_combat_planner )
	action:add_precondition( world_property( xr_evaluators_id.chugai_heli_hunter_base, false ) )

	action = manager:action( stalker_ids.action_danger_planner )
	action:add_precondition( world_property( xr_evaluators_id.chugai_heli_hunter_base, false ) )
end

function set_scheme( npc, ini, scheme, section )
	--'printf( "DEBUG: set_scheme: scheme='%s' section='%s'", scheme, utils.to_str(section) )

	local a = xr_logic.assign_storage_and_bind( npc, ini, scheme, section )

	a.attack_dist_sqr = math.pow( utils.cfg_get_number( ini, section, "dist", npc, false, def_attack_dist ), 2 )
	a.attack_actor_sqr = math.pow( utils.cfg_get_number( ini, section, "actor_dist", npc, false, def_actor_dist ), 2 )
	a.heli = nil
	a.enabled = true
end

function disable_scheme(npc, scheme)
	local st = db.storage[npc:id()][scheme]
	if st then
		st.enabled = false
	end
end