MHR-Overlay/reframework/autorun/MHR_Overlay/Monsters/monster_hook.lua

local monster_hook = {};
local small_monster;
local large_monster;
local config;
local ailments;

local character_base_type_def = sdk.find_type_definition("snow.CharacterBase");
local character_base_start_method = character_base_type_def:get_method("start");

local enemy_character_base_type_def = sdk.find_type_definition("snow.enemy.EnemyCharacterBase");
local enemy_character_base_update_method = enemy_character_base_type_def:get_method("update");
local is_boss_enemy_method = enemy_character_base_type_def:get_method("get_isBossEnemy");

local enemy_damage_check_type_def = sdk.find_type_definition("snow.enemy.EnemyDamageCheck");
local damage_check_update_param_update_method = enemy_damage_check_type_def:get_method("updateParam");

local anger_param_type_def = sdk.find_type_definition("snow.enemy.EnemyAngerParam");
local anger_add_method = anger_param_type_def:get_method("add");
local anger_update_method = anger_param_type_def:get_method("updateNormal");

local stamina_param_type_def = sdk.find_type_definition("snow.enemy.EnemyStaminaParam");
local stamina_sub_method = stamina_param_type_def:get_method("sub");
local stamina_update_method = stamina_param_type_def:get_method("updateParam");

local tick_count = 0;
local last_update_tick = 0;
local recorded_monsters = {};
local updated_monsters = {};
local known_big_monsters = {};
local num_known_monsters = 0;
local num_updated_monsters = 0;

local updates_this_tick = 0;

-- run every tick to keep track of msonsters
-- whenever we've updated enough monsters to surpass how many we've seen,
-- we reset and start over
-- this allows us to only update N monsters per tick to save on performance
-- the reason for this is that the hooks on all the monsters' update functions
-- causes a HUGE performance hit (adds ~3+ ms to UpdateBehavior and frame time)
re.on_pre_application_entry("UpdateBehavior", function()
    tick_count = tick_count + 1;
	updates_this_tick = 0;
 
    if num_known_monsters ~= 0 and num_updated_monsters >= num_known_monsters or tick_count >= num_known_monsters * 2 then
        recorded_monsters = {};
        updated_monsters = {};
		known_big_monsters = {};
        last_update_tick = 0;
        tick_count = 0;
        num_known_monsters = 0;
        num_updated_monsters = 0;
		updates_this_tick = 0;
    end
end)

--snow.enemy.EnemyDamageStockParam
function monster_hook.update_health(enemy_damage_stock_param)
	local enemy = enemy_damage_stock_param:call("get_RefEnemy");
	if enemy == nil then
		return;
	end

	local is_large = is_boss_enemy_method:call(enemy);

	if is_large == nil then
		return;
	end
	
	if is_large then
		local monster = large_monster.get_monster(enemy);
		
		local physical_param = large_monster.update_health(enemy, monster);
		large_monster.update_parts(enemy, monster, physical_param);

	else
		local monster = small_monster.get_monster(enemy);
		small_monster.update_health(enemy, monster);
	end
end

function monster_hook.update_stamina(stamina_param, stamina_sub)
	if stamina_sub == 0 then
		return;
	end

	local enemy = stamina_param:call("get_Em");
	if enemy == nil then
		return;
	end

	local monster = large_monster.get_monster(enemy);
	large_monster.update_stamina(enemy, monster, stamina_param);

	-- stamina sub gets called periodically at low rate for large monsters even without damage
	large_monster.update(enemy, monster);
end

function monster_hook.update_stamina_timer(stamina_param, enemy)
	local monster = large_monster.get_monster(enemy);
	large_monster.update_stamina(enemy, monster, stamina_param);
end

function monster_hook.update_rage(anger_param, anger_add, enemy)
	if anger_add == 0 then
		return;
	end

	local monster = large_monster.get_monster(enemy);
	large_monster.update_rage(enemy, monster, anger_param);
end

function monster_hook.update_rage_timer(anger_param, enemy)
	local monster = large_monster.get_monster(enemy);
	large_monster.update_rage_timer(enemy, monster, anger_param);
end

function monster_hook.update_monster(enemy)
	if enemy == nil then
		return;
	end

    if not recorded_monsters[enemy] then
        num_known_monsters = num_known_monsters + 1;
        recorded_monsters[enemy] = true;
    end

	-- saves on a method call.
	if not known_big_monsters[enemy] then
		known_big_monsters[enemy] = is_boss_enemy_method:call(enemy);
	end

	local is_large = known_big_monsters[enemy];

	if is_large == nil then
		return;
	end
	
	if is_large then
		monster_hook.update_large_monster(enemy);
	else
		monster_hook.update_small_monster(enemy);
	end
end

function monster_hook.update_large_monster(enemy)
	local cached_config = config.current_config.large_monster_UI;

	if not cached_config.dynamic.enabled then
		return;
	end

	local monster = large_monster.get_monster(enemy);

	-- this is the VERY LEAST thing we should do all the time
	-- so the position doesn't lag all over the place
	-- due to how infrequently we update the monster(s).
	large_monster.update_position(enemy, monster);
end

function monster_hook.update_small_monster(enemy)
	if not config.current_config.small_monster_UI.enabled then
		return;
	end

	local monster = small_monster.get_monster(enemy);

	-- this is the VERY LEAST thing we should do all the time
	-- so the position doesn't lag all over the place
	-- due to how infrequently we update the monster(s).
	small_monster.update_position(enemy, monster);

	if updated_monsters[enemy] then
		return;
	end

	-- is it old tick?
	-- is update limit reached?
	if tick_count == last_update_tick and updates_this_tick >= config.current_config.global_settings.performance.max_monster_updates_per_tick then
		return;
	end

	-- actually update the enemy now. we don't do this very often
	-- due to how much CPU time it takes to update each monster.
	updates_this_tick = updates_this_tick + 1;
	last_update_tick = tick_count;
	num_updated_monsters = num_updated_monsters + 1;
	updated_monsters[enemy] = true;

	small_monster.update(enemy, monster);
end

function monster_hook.init_module()
	small_monster = require("MHR_Overlay.Monsters.small_monster");
	large_monster = require("MHR_Overlay.Monsters.large_monster");
	config = require("MHR_Overlay.Misc.config");

	sdk.hook(enemy_character_base_update_method, function(args)
		pcall(monster_hook.update_monster, sdk.to_managed_object(args[2]));
	end, function(retval)
		return retval;
	end);

	sdk.hook(damage_check_update_param_update_method, function(args)
		pcall(monster_hook.update_health, sdk.to_managed_object(args[2]));
	end, function(retval)
		return retval;
	end);

	sdk.hook(stamina_sub_method, function(args)
		pcall(monster_hook.update_stamina, sdk.to_managed_object(args[2]), sdk.to_float(args[3]));
	end, function(retval)
		return retval;
	end);

	sdk.hook(stamina_update_method, function(args)
		pcall(monster_hook.update_stamina, sdk.to_managed_object(args[2]), -1, sdk.to_managed_object(args[3]));
	end, function(retval)
		return retval;
	end);

	sdk.hook(anger_add_method, function(args)
		pcall(monster_hook.update_rage, sdk.to_managed_object(args[2]), sdk.to_float(args[3]), sdk.to_managed_object(args[4]));
	end, function(retval)
		return retval;
	end);

	sdk.hook(anger_update_method, function(args)
		pcall(monster_hook.update_rage_timer, sdk.to_managed_object(args[2]), sdk.to_managed_object(args[3]));
	end, function(retval)
		return retval;
	end);


end

return monster_hook;