----------------------------------------------------------------------------
--	Ranked Matchmaking AI v1.5f
--	Author: adamqqq		Email:adamqqq@163.com
--  Contributor: zmcmcc Email:mengzhang@utexas.edu
----------------------------------------------------------------------------
--------------------------------------
-- General Initialization
--------------------------------------
local utility = require(GetScriptDirectory() .. "/utility")
local ability_item_usage_generic = require(GetScriptDirectory() .. "/ability_item_usage_generic")
local AbilityExtensions = require(GetScriptDirectory() .. "/util/AbilityAbstraction")

local debugmode = false
local npcBot = GetBot()
if npcBot == nil or npcBot:IsIllusion() then
	return
end

local Talents = {}
local Abilities = {}
local AbilitiesReal = {}

ability_item_usage_generic.InitAbility(Abilities, AbilitiesReal, Talents)

local abilityName = { "tusk_ice_shards", "tusk_snowball", "tusk_tag_team", "tusk_walrus_kick", "tusk_frozen_sigil",
	"tusk_walrus_punch", "tusk_launch_snowball", "ability_capture", "abyssal_underlord_portal_warp" }

local AbilityToLevelUp =
{
	Abilities[1],
	Abilities[2],
	Abilities[1],
	Abilities[2],
	Abilities[1],
	Abilities[5],
	Abilities[1],
	Abilities[2],
	Abilities[2],
	"talent",
	Abilities[3],
	Abilities[5],
	Abilities[3],
	Abilities[3],
	"talent",
	Abilities[3],
	"nil",
	Abilities[5],
	"nil",
	"talent",
	"nil",
	"nil",
	"nil",
	"nil",
	"talent",
}
local TalentTree = {
	function()
		return Talents[2]
	end,
	function()
		return Talents[4]
	end,
	function()
		return Talents[6]
	end,
	function()
		return Talents[7]
	end
}

-- check skill build vs current level
utility.CheckAbilityBuild(AbilityToLevelUp)

function BuybackUsageThink()
	ability_item_usage_generic.BuybackUsageThink();
end

function CourierUsageThink()
	ability_item_usage_generic.CourierUsageThink();
end

function AbilityLevelUpThink()
	ability_item_usage_generic.AbilityLevelUpThink2(AbilityToLevelUp, TalentTree)
end

--------------------------------------
-- Ability Usage Thinking
--------------------------------------
local cast = {}
cast.Desire = {}
cast.Target = {}
cast.Type = {}
local Consider = {}
local CanCast = { utility.NCanCast, utility.NCanCast, utility.NCanCast, utility.UCanCast, function() return true end,
	AbilityExtensions.PhysicalCanCastFunction, function(t)
		return AbilityExtensions:AllyCanCast(t) and not AbilityExtensions:DontInterruptAlly(t)
	end }
local enemyDisabled = utility.enemyDisabled

function GetComboDamage()
	return ability_item_usage_generic.GetComboDamage(AbilitiesReal)
end

function GetComboMana()
	return ability_item_usage_generic.GetComboMana(AbilitiesReal)
end

Consider[1] = function()
	local abilityNumber = 1
	--------------------------------------
	-- Generic Variable Setting
	--------------------------------------
	local ability = AbilitiesReal[abilityNumber];

	if not ability:IsFullyCastable() then
		return BOT_ACTION_DESIRE_NONE, 0;
	end

	local CastRange = 1600;
	local Damage = ability:GetSpecialValueInt("shard_damage");
	local Radius = ability:GetSpecialValueInt("shard_width");
	local CastPoint = ability:GetCastPoint() --+ability:GetSpecialValueFloat( "delay" );
	local Speed = ability:GetSpecialValueInt("shard_speed");


	local allys = npcBot:GetNearbyHeroes(1200, false, BOT_MODE_NONE);
	local enemys = npcBot:GetNearbyHeroes(1600, true, BOT_MODE_NONE)
	local WeakestEnemy, HeroHealth = utility.GetWeakestUnit(enemys)
	local creeps = npcBot:GetNearbyCreeps(1600, true)
	local WeakestCreep, CreepHealth = utility.GetWeakestUnit(creeps)


	--------------------------------------
	-- Global high-priorty usage
	--------------------------------------
	--try to kill enemy hero
	if (npcBot:GetActiveMode() ~= BOT_MODE_RETREAT)
	then
		if (WeakestEnemy ~= nil)
		then
			if (CanCast[abilityNumber](WeakestEnemy))
			then
				if (HeroHealth <= WeakestEnemy:GetActualIncomingDamage(Damage, DAMAGE_TYPE_MAGICAL)
					or
					(
					HeroHealth <= WeakestEnemy:GetActualIncomingDamage(GetComboDamage(), DAMAGE_TYPE_MAGICAL) and
						npcBot:GetMana() > ComboMana)
					or HeroHealth / WeakestEnemy:GetMaxHealth() < 0.65)
				then
					local dist = GetUnitToUnitDistance(npcBot, WeakestEnemy);
					return BOT_ACTION_DESIRE_HIGH,
						npcBot:GetXUnitsTowardsLocation(WeakestEnemy:GetLocation(), dist + (dist / Speed + CastPoint) * 350);
				end
			end
		end
	end
	--------------------------------------
	-- Mode based usage
	--------------------------------------
	-- If we're seriously retreating, see if we can land a stun on someone who's damaged us recently
	if (npcBot:GetActiveMode() == BOT_MODE_RETREAT and npcBot:GetActiveModeDesire() >= BOT_MODE_DESIRE_HIGH)
	then
		for _, npcEnemy in pairs(enemys) do
			if (npcBot:WasRecentlyDamagedByHero(npcEnemy, 2.0))
			then
				if (CanCast[abilityNumber](npcEnemy))
				then
					return BOT_ACTION_DESIRE_HIGH,
						npcEnemy:GetExtrapolatedLocation(GetUnitToUnitDistance(npcEnemy, npcBot) / Speed + CastPoint);
				end
			end
		end
	end

	-- If we're pushing or defending a lane and can hit 4+ creeps
	if (npcBot:GetActiveMode() == BOT_MODE_PUSH_TOWER_TOP or
		npcBot:GetActiveMode() == BOT_MODE_PUSH_TOWER_MID or
		npcBot:GetActiveMode() == BOT_MODE_PUSH_TOWER_BOT or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_TOWER_TOP or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_TOWER_MID or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_TOWER_BOT)
	then
		if ((ManaPercentage > 0.4 or npcBot:GetMana() > ComboMana))
		then
			local locationAoE = npcBot:FindAoELocation(true, false, npcBot:GetLocation(), CastRange, Radius, CastPoint, 0);
			if (locationAoE.count >= 5)
			then
				return BOT_ACTION_DESIRE_LOW, locationAoE.targetloc;
			end
		end
	end


	-- If we're going after someone
	if (npcBot:GetActiveMode() == BOT_MODE_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_TEAM_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_ALLY or
		npcBot:GetActiveMode() == BOT_MODE_ATTACK)
	then
		local npcTarget = npcBot:GetTarget();
		if (npcTarget ~= nil)
		then
			if (CanCast[abilityNumber](npcTarget))
			then
				local dist = GetUnitToUnitDistance(npcBot, npcTarget);
				if dist < CastRange or npcTarget:GetHealth() / npcTarget:GetMaxHealth() < 0.65
				then
					return BOT_ACTION_DESIRE_HIGH - 0.1,
						npcBot:GetXUnitsTowardsLocation(npcTarget:GetLocation(), dist + (dist / Speed + CastPoint) * 350);
				end
			end
		end
	end

	return BOT_ACTION_DESIRE_NONE, 0;
end

--[[function Timer()
	
	local desire=Consider[2]
	if(desire>0)
	then
		snowTimer=DotaTime()
		return desire
	end

end]]


Consider[2] = function()

	local abilityNumber = 2
	--------------------------------------
	-- Generic Variable Setting
	--------------------------------------
	local ability = AbilitiesReal[abilityNumber];

	if not ability:IsFullyCastable() or AbilityExtensions:CannotMove(npcBot) then
		return BOT_ACTION_DESIRE_NONE, 0;
	end

	local CastRange = ability:GetCastRange();
	local Damage = ability:GetSpecialValueInt("snowball_damage");


	local allys = npcBot:GetNearbyHeroes(1200, false, BOT_MODE_NONE);
	local enemys = npcBot:GetNearbyHeroes(CastRange + 300, true, BOT_MODE_NONE)
	local WeakestEnemy, HeroHealth = utility.GetWeakestUnit(enemys)
	local creeps = npcBot:GetNearbyCreeps(CastRange + 300, true)
	local WeakestCreep, CreepHealth = utility.GetWeakestUnit(creeps)

	if npcBot:HasModifier("tusk_snowball") then
		local IsLongRanger = function(ally)
			local longRangers = {
				"npc_dota_hero_sniper",
				"npc_dota_hero_enchantress",
				"npc_dota_hero_drow_ranger",
			}
			return AbilityExtensions:Contains(longRangers, ally:GetUnitName())
		end
		local CanCast = function(ally)
			return ally:IsIllusion() or
				not ally:IsInvulnerable() and not AbilityExtensions:CannotBeTargetted(ally) and
				not AbilityExtensions:MayNotBeSeen(ally) and not AbilityExtensions:DontInterruptAlly(ally) and
				(not IsLongRanger(ally) or AbilityExtensions:IsSeverelyDisabled(ally))
		end
		local radius = ability:GetSpecialValueInt("snowball_windup_radius")
		local allys = npcBot:GetNearbyHeroes(radius, false, BOT_MODE_NONE)
		allys = AbilityExtensions:Filter(allys, function(t) return not t:IsBot() or AbilityExtensions:NotRetreating(t) end)
		allys = AbilityExtensions:Filter(allys, CanCast)
		if allys[1] then
			return BOT_ACTION_DESIRE_HIGH, allys[1]
		end
	end

	-- Check for a channeling enemy
	for _, enemy in pairs(enemys) do
		if (enemy:IsChanneling() and CanCast[abilityNumber](enemy))
		then
			return BOT_ACTION_DESIRE_HIGH, enemy
		end
	end

	-- If we're in a teamfight, use it on the scariest enemy
	local tableNearbyAttackingAlliedHeroes = npcBot:GetNearbyHeroes(1000, false, BOT_MODE_ATTACK);
	if (#tableNearbyAttackingAlliedHeroes >= 2)
	then

		local npcMostDangerousEnemy = nil;
		local nMostDangerousDamage = 0;

		local tableNearbyEnemyHeroes = npcBot:GetNearbyHeroes(CastRange, true, BOT_MODE_NONE);
		for _, npcEnemy in pairs(tableNearbyEnemyHeroes) do
			if (CanCast[abilityNumber](npcEnemy))
			then
				local Damage2 = npcEnemy:GetEstimatedDamageToTarget(false, npcBot, 3.0, DAMAGE_TYPE_ALL);
				if (Damage2 > nMostDangerousDamage)
				then
					nMostDangerousDamage = Damage2;
					npcMostDangerousEnemy = npcEnemy;
				end
			end
		end

		if (npcMostDangerousEnemy ~= nil)
		then
			return BOT_ACTION_DESIRE_MODERATE - 0.1, npcMostDangerousEnemy;
		end
	end

	--try to kill enemy hero
	if (npcBot:GetActiveMode() ~= BOT_MODE_RETREAT)
	then
		if (WeakestEnemy ~= nil)
		then
			if (CanCast[abilityNumber](WeakestEnemy))
			then
				if (HeroHealth <= WeakestEnemy:GetActualIncomingDamage(Damage, DAMAGE_TYPE_MAGICAL)
					or
					(
					HeroHealth <= WeakestEnemy:GetActualIncomingDamage(GetComboDamage(), DAMAGE_TYPE_MAGICAL) and
						npcBot:GetMana() > ComboMana)
					or HeroHealth / WeakestEnemy:GetMaxHealth() < 0.4)
				then
					return BOT_ACTION_DESIRE_MODERATE + 0.1, WeakestEnemy;
				end
			end
		end
	end

	--------------------------------------
	-- Mode based usage
	--------------------------------------
	-- If we're seriously retreating, see if we can land a stun on someone who's damaged us recently
	if (npcBot:GetActiveMode() == BOT_MODE_RETREAT and npcBot:GetActiveModeDesire() >= BOT_MODE_DESIRE_HIGH)
	then
		for _, npcEnemy in pairs(enemys) do
			if (npcBot:WasRecentlyDamagedByHero(npcEnemy, 2.0))
			then
				if (CanCast[abilityNumber](npcEnemy) and not enemyDisabled(npcEnemy))
				then
					return BOT_ACTION_DESIRE_HIGH, npcEnemy;
				end
			end
		end
	end

	-- If we're going after someone
	if (npcBot:GetActiveMode() == BOT_MODE_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_TEAM_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_ALLY or
		npcBot:GetActiveMode() == BOT_MODE_ATTACK)
	then
		local npcTarget = npcBot:GetTarget();

		if (npcTarget ~= nil)
		then
			if (CanCast[abilityNumber](npcTarget))
			then
				return BOT_ACTION_DESIRE_MODERATE, npcTarget;
			end
		end
	end

	return BOT_ACTION_DESIRE_NONE, 0
end

--[[Consider[6]=function() -- 释放雪球

	local abilityNumber=6
	--------------------------------------
	-- Generic Variable Setting
	--------------------------------------
	local ability=AbilitiesReal[abilityNumber];

	if not ability:IsFullyCastable() then
		return BOT_ACTION_DESIRE_NONE, 0;
	end

	
	if(snowTimer ~= nil)
	then
		local TimeSinceCast = DotaTime()-snowTimer;
		if(TimeSinceCast>=0.5)
		then
			return BOT_ACTION_DESIRE_VERYHIGH
		end
	end

	return BOT_ACTION_DESIRE_NONE, 0;
end]]


Consider[3] = function()

	local abilityNumber = 3
	--------------------------------------
	-- Generic Variable Setting
	--------------------------------------
	local ability = AbilitiesReal[abilityNumber];

	if not ability:IsFullyCastable() then
		return BOT_ACTION_DESIRE_NONE, 0;
	end



	local allys = npcBot:GetNearbyHeroes(1200, false, BOT_MODE_NONE);
	local enemys = npcBot:GetNearbyHeroes(1200, true, BOT_MODE_NONE)
	local WeakestEnemy, HeroHealth = utility.GetWeakestUnit(enemys)
	local creeps = npcBot:GetNearbyCreeps(1200 + 300, true)
	local WeakestCreep, CreepHealth = utility.GetWeakestUnit(creeps)

	--------------------------------------
	-- Mode based usage
	--------------------------------------


	-- If we're going after someone
	if (npcBot:GetActiveMode() == BOT_MODE_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_TEAM_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_ALLY or
		npcBot:GetActiveMode() == BOT_MODE_ATTACK)
	then
		local npcTarget = npcBot:GetTarget();

		if (npcTarget ~= nil)
		then
			return BOT_ACTION_DESIRE_HIGH + 0.01
		end
	end

	--try to kill enemy hero
	if (npcBot:GetActiveMode() ~= BOT_MODE_RETREAT)
	then
		if (WeakestEnemy ~= nil)
		then
			return BOT_ACTION_DESIRE_HIGH + 0.01
		end
	end
	--------------------------------------
	-- Mode based usage
	--------------------------------------
	-- If we're seriously retreating, see if we can land a stun on someone who's damaged us recently
	if (npcBot:GetActiveMode() == BOT_MODE_RETREAT and npcBot:GetActiveModeDesire() >= BOT_MODE_DESIRE_HIGH)
	then
		for _, npcEnemy in pairs(enemys) do
			if (npcBot:WasRecentlyDamagedByHero(npcEnemy, 2.0))
			then
				return BOT_ACTION_DESIRE_HIGH + 0.01
			end
		end
	end

	return BOT_ACTION_DESIRE_NONE, 0
end

Consider[5] = function()

	local abilityNumber = 5
	--------------------------------------
	-- Generic Variable Setting
	--------------------------------------
	local ability = AbilitiesReal[abilityNumber];

	if not ability:IsFullyCastable() then
		return BOT_ACTION_DESIRE_NONE, 0;
	end

	local CastRange = ability:GetCastRange();
	local Damage = ability:GetAbilityDamage();


	local allys = npcBot:GetNearbyHeroes(1200, false, BOT_MODE_NONE);
	local enemys = npcBot:GetNearbyHeroes(CastRange + 300, true, BOT_MODE_NONE)
	local WeakestEnemy, HeroHealth = utility.GetWeakestUnit(enemys)
	local creeps = npcBot:GetNearbyCreeps(CastRange + 300, true)
	local WeakestCreep, CreepHealth = utility.GetWeakestUnit(creeps)

	--[[
	if(ability:GetToggleState()==false)
	then
		local t=npcBot:GetAttackTarget()
		if(t~=nil)
		then
			if (ManaPercentage > 0.35)
			then
				ability:ToggleAutoCast()
				return BOT_ACTION_DESIRE_NONE, 0;
			end
		end
	end]]

	-- Check for a channeling enemy
	for _, enemy in pairs(enemys) do
		if (enemy:IsChanneling())
		then
			return BOT_ACTION_DESIRE_LOW, enemy
		end
	end

	-- If we're in a teamfight, use it on the scariest enemy
	local tableNearbyAttackingAlliedHeroes = npcBot:GetNearbyHeroes(1000, false, BOT_MODE_ATTACK);
	if (#tableNearbyAttackingAlliedHeroes >= 2)
	then

		local npcMostDangerousEnemy = nil;
		local nMostDangerousDamage = 0;

		local tableNearbyEnemyHeroes = npcBot:GetNearbyHeroes(CastRange, true, BOT_MODE_NONE);
		for _, npcEnemy in pairs(tableNearbyEnemyHeroes) do
			local Damage2 = npcEnemy:GetEstimatedDamageToTarget(false, npcBot, 3.0, DAMAGE_TYPE_ALL);
			if (Damage2 > nMostDangerousDamage)
			then
				nMostDangerousDamage = Damage2;
				npcMostDangerousEnemy = npcEnemy;
			end
		end

		if (npcMostDangerousEnemy ~= nil)
		then
			return BOT_ACTION_DESIRE_LOW - 0.1, npcMostDangerousEnemy;
		end
	end

	--try to kill enemy hero
	if (npcBot:GetActiveMode() ~= BOT_MODE_RETREAT)
	then
		if (WeakestEnemy ~= nil)
		then
			if (
				HeroHealth <= WeakestEnemy:GetActualIncomingDamage(Damage, DAMAGE_TYPE_MAGICAL) or
					(
					HeroHealth <= WeakestEnemy:GetActualIncomingDamage(GetComboDamage(), DAMAGE_TYPE_MAGICAL) and
						npcBot:GetMana() > ComboMana))
			then
				return BOT_ACTION_DESIRE_LOW + 0.1, WeakestEnemy;
			end
		end
	end

	--------------------------------------
	-- Mode based usage
	--------------------------------------


	-- If we're going after someone
	if (npcBot:GetActiveMode() == BOT_MODE_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_TEAM_ROAM or
		npcBot:GetActiveMode() == BOT_MODE_DEFEND_ALLY or
		npcBot:GetActiveMode() == BOT_MODE_ATTACK)
	then
		local npcTarget = AbilityExtensions:GetTargetIfGood(npcBot)

		if (npcTarget ~= nil)
		then
			if (GetUnitToUnitDistance(npcBot, npcTarget) < CastRange + 75 * #allys)
			then
				return BOT_ACTION_DESIRE_LOW, npcTarget
			end
		end
	end

	return BOT_ACTION_DESIRE_NONE, 0
end

-- launch snowball
local function IsSnowballTarget(t) return t:HasModifier("modifier_tusk_snowball_target") end

local snowballTarget
local function RefreshSnowballTarget()
	snowballTarget = AbilityExtensions:First(GetUnitList(UNIT_LIST_ENEMY_HEROES), IsSnowballTarget)
end

RefreshSnowballTarget()

Consider[6] = function()
	local ability = AbilitiesReal[6]
	if not ability:IsFullyCastable() or ability:IsHidden() then
		return 0
	end
	local range = ability:GetSpecialValueInt "snowball_windup_radius"
	if snowballTarget == nil then
		RefreshSnowballTarget()
	end
	if snowballTarget == nil then
		return 0
	end

	if AbilityExtensions:HasAbilityRetargetModifier(snowballTarget) and not snowballTarget:IsChanneling() then
		return 0
	end
	if snowballTarget:IsChanneling() or GetUnitToUnitDistanceSqr(snowballTarget, npcBot) >= 360000 then
		return BOT_ACTION_DESIRE_VERYHIGH
	end
	local availableFriends = AbilityExtensions:GetNearbyHeroes(npcBot, 600, false):Filter(function(t)
		return GetUnitToUnitDistance(npcBot, t) <= range + t:GetBoundingRadius() and CanCast[7](t)
	end)
	availableFriends:ForEach(function(t)
		print("nearby friend " .. t:GetUnitName())
	end)
	if availableFriends[1] then
		return BOT_ACTION_DESIRE_HIGH, availableFriends[1]
	end

	local snowballFriends = npcBot:GetNearbyHeroes(100, false, BOT_MODE_NONE)
	snowballFriends = AbilityExtensions:Filter(snowballFriends, function(t)
		return t:HasModifier("modifier_tusk_snowball_movement_friendly")
	end)
	if #snowballFriends > 0 and AbilityExtensions:All(snowballFriends, function(t)
		return AbilityExtensions:MustBeIllusion(npcBot, t) or
			AbilityExtensions:GetHealthPercent(t) >= AbilityExtensions:GetHealthPercent(snowballTarget) * 1.5
	end) then
		return BOT_ACTION_DESIRE_HIGH
	end
	return 0
end


-- walrus kick
Consider[4] = function()

	local abilityNumber = 4
	--------------------------------------
	-- Generic Variable Setting
	--------------------------------------
	local ability = AbilitiesReal[abilityNumber];

	if not ability:IsFullyCastable() then
		return BOT_ACTION_DESIRE_NONE, 0;
	end

	local CastRange = ability:GetCastRange();
	local Damage = ability:GetAbilityDamage();


	local allys = npcBot:GetNearbyHeroes(1200, false, BOT_MODE_NONE);
	local enemys = npcBot:GetNearbyHeroes(CastRange + 300, true, BOT_MODE_NONE)
	local WeakestEnemy, HeroHealth = utility.GetWeakestUnit(enemys)
	local creeps = npcBot:GetNearbyCreeps(CastRange + 300, true)
	local WeakestCreep, CreepHealth = utility.GetWeakestUnit(creeps)

	-- If we're in a teamfight, use it on the scariest enemy
	local tableNearbyAttackingAlliedHeroes = npcBot:GetNearbyHeroes(1000, false, BOT_MODE_ATTACK);
	if (#tableNearbyAttackingAlliedHeroes >= 2)
	then

		local npcMostDangerousEnemy = nil;
		local nMostDangerousDamage = 0;

		local tableNearbyEnemyHeroes = npcBot:GetNearbyHeroes(CastRange, true, BOT_MODE_NONE);
		for _, npcEnemy in pairs(tableNearbyEnemyHeroes) do
			if (CanCast[abilityNumber](npcEnemy))
			then
				local Damage2 = npcEnemy:GetEstimatedDamageToTarget(false, npcBot, 3.0, DAMAGE_TYPE_ALL);
				if (Damage2 > nMostDangerousDamage)
				then
					nMostDangerousDamage = Damage2;
					npcMostDangerousEnemy = npcEnemy;
				end
			end
		end

		if (npcMostDangerousEnemy ~= nil)
		then
			return BOT_ACTION_DESIRE_LOW, npcMostDangerousEnemy;
		end
	end

	--try to kill enemy hero
	if (npcBot:GetActiveMode() ~= BOT_MODE_RETREAT)
	then
		if (WeakestEnemy ~= nil)
		then
			if (CanCast[abilityNumber](WeakestEnemy))
			then
				if (
					HeroHealth <= WeakestEnemy:GetActualIncomingDamage(Damage, DAMAGE_TYPE_MAGICAL) or
						(
						HeroHealth <= WeakestEnemy:GetActualIncomingDamage(GetComboDamage(), DAMAGE_TYPE_MAGICAL) and
							npcBot:GetMana() > ComboMana))
				then
					return BOT_ACTION_DESIRE_LOW - 0.1, WeakestEnemy;
				end
			end
		end
	end

	--------------------------------------
	-- Mode based usage
	--------------------------------------
	-- If we're seriously retreating, see if we can land a stun on someone who's damaged us recently
	if (npcBot:GetActiveMode() == BOT_MODE_RETREAT and npcBot:GetActiveModeDesire() >= BOT_MODE_DESIRE_HIGH)
	then
		for _, npcEnemy in pairs(enemys) do
			if (npcBot:WasRecentlyDamagedByHero(npcEnemy, 2.0))
			then
				if (CanCast[abilityNumber](npcEnemy))
				then
					return BOT_ACTION_DESIRE_HIGH, npcEnemy;
				end
			end
		end
	end
	return BOT_ACTION_DESIRE_NONE
end

local clearSnowballTarget

AbilityExtensions:AutoModifyConsiderFunction(npcBot, Consider, AbilitiesReal)
function AbilityUsageThink()
	if snowballTarget and not snowballTarget:IsNull() and not AbilitiesReal[2]:IsCooldownReady() and
		not AbilitiesReal[7]:IsHidden() and not clearSnowballTarget then
		clearSnowballTarget = 1
		AbilityExtensions:StartCoroutine(function()
			AbilityExtensions:WaitForSeconds(AbilitiesReal[2]:GetSpecialValueFloat "snowball_duration")
			snowballTarget = nil
			clearSnowballTarget = nil
		end)
	end
	if not npcBot:IsAlive() then
		snowballTarget = nil
		clearSnowballTarget = nil
	end

	-- Check if we're already using an ability
	if (npcBot:IsUsingAbility() or npcBot:IsChanneling() or npcBot:IsSilenced())
	then
		return
	end

	ComboMana = GetComboMana()
	AttackRange = npcBot:GetAttackRange()
	ManaPercentage = npcBot:GetMana() / npcBot:GetMaxMana()
	HealthPercentage = npcBot:GetHealth() / npcBot:GetMaxHealth()

	cast = ability_item_usage_generic.ConsiderAbility(AbilitiesReal, Consider)
	---------------------------------debug--------------------------------------------
	if (debugmode == true)
	then
		ability_item_usage_generic.PrintDebugInfo(AbilitiesReal, cast)
	end
	local index, target = ability_item_usage_generic.UseAbility(AbilitiesReal, cast)
	if index == 2 then
		snowballTarget = target
	end
end

function CourierUsageThink()
	ability_item_usage_generic.CourierUsageThink()
end
