require( "ai/shared" )
require( "ai/ai_core" )

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function Spawn( entityKeyValues )
	if not IsServer() then
		return
	end

	if thisEntity == nil then
		return
	end

	thisEntity.hInfernalBlade = thisEntity:FindAbilityByName( "creature_doom_infernal_blade" )
	thisEntity.nInfernalBladeSearchRange = 700

	thisEntity.hDoomAbility = thisEntity:FindAbilityByName( "creature_doom_bringer_doom" )
	thisEntity.nDoomAbilitySearchRange = 800
	thisEntity.nDoomAbilityHealthPercentTrigger = 80

	thisEntity:SetContextThink( "DoomThink", DoomThink, 1 )
end

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function Precache( context )
	PrecacheResource( "particle", "particles/units/heroes/hero_doom_bringer/doom_infernal_blade_impact.vpcf", context )
	PrecacheResource( "particle", "particles/units/heroes/hero_doom_bringer/doom_infernal_blade_debuff.vpcf", context )

	PrecacheResource( "particle", "particles/units/heroes/hero_doom_bringer/doom_bringer_doom.vpcf", context )
	PrecacheResource( "particle", "particles/status_fx/status_effect_doom.vpcf", context )
	PrecacheResource( "particle", "particles/generic_gameplay/generic_muted.vpcf", context )
	PrecacheResource( "particle", "particles/generic_gameplay/generic_break.vpcf", context )
end

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function DoomThink()

	local flNow = GameRules:GetGameTime()

	if thisEntity.hInfernalBlade and thisEntity.hInfernalBlade:IsFullyCastable() then
		local hHeroes = GetEnemyHeroesInRange( thisEntity, thisEntity.nInfernalBladeSearchRange )

		if #hHeroes > 0 then
			ExecuteOrderFromTable({
				UnitIndex = thisEntity:entindex(),
				OrderType = DOTA_UNIT_ORDER_CAST_TARGET,
				TargetIndex = hHeroes[1]:entindex(),
				AbilityIndex = thisEntity.hInfernalBlade:entindex(),
				Queue = false,
			})
		end

		return 0.25
	end


	if thisEntity.hDoomAbility and thisEntity.hDoomAbility:IsFullyCastable() and thisEntity:GetHealthPercent() < thisEntity.nDoomAbilityHealthPercentTrigger then
		local hHeroes = GetEnemyHeroesInRange( thisEntity, thisEntity.nDoomAbilitySearchRange )

		if #hHeroes > 0 then
			ExecuteOrderFromTable({
				UnitIndex = thisEntity:entindex(),
				OrderType = DOTA_UNIT_ORDER_CAST_TARGET,
				TargetIndex = hHeroes[1]:entindex(),
				AbilityIndex = thisEntity.hDoomAbility:entindex(),
				Queue = false,
			})
		end

		return 0.25
	end


	thisEntity.flLastAggroSwitch = thisEntity.flLastAggroSwitch and thisEntity.flLastAggroSwitch or 0

	local hTarget = AICore:ClosestEnemyHeroInRange( thisEntity, 9000 )

	if (flNow - thisEntity.flLastAggroSwitch) > 2 then
		AttackTargetOrder( thisEntity, hTarget )
		thisEntity.flLastAggroSwitch = flNow
	end

	return 0.25
end

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