--[[
   Copyright (c) The OpenRA Developers and Contributors
   This file is part of OpenRA, which is free software. It is made
   available to you under the terms of the GNU General Public License
   as published by the Free Software Foundation, either version 3 of
   the License, or (at your option) any later version. For more
   information, see COPYING.
]]
BadGuy = Player.GetPlayer("BadGuy")
England = Player.GetPlayer("England")
Greece = Player.GetPlayer("Greece")
GoodGuy = Player.GetPlayer("GoodGuy")
Neutral = Player.GetPlayer("Neutral")
USSR = Player.GetPlayer("USSR")

ForestTeam = { ForestPatroller1, ForestPatroller2, ForestPatroller3, ForestPatroller4, ForestPatroller5, ForestPatroller6, ForestPatroller7, ForestPatroller8 }
BlockerTeam = { BlockerGuard1, BlockerGuard2, BlockerTank }
SoutheastTurretGuards = { SoutheastTurretRifle1, SoutheastTurretRifle2, SoutheastTurretRifle3 }
Hostages = { Hostage1, Hostage2, Hostage3, Hostage4, Hostage5 }

TimerColor = HSLColor.White
TimeRemaining = 0

TanyaType = "e7.noautotarget"
if Difficulty == "easy" then
	TanyaType = "e7"
end

WorldLoaded = function()
	Camera.Position = TanyaDrop.CenterPosition
	SpawnPlayerCamera(TanyaDrop.Location, DateTime.Seconds(20))

	StartSoldier.Move(WestRoadRally.Location)
	if Difficulty == "hard" then
		StartSoldier.CallFunc(ReinforceStartSoldiers)
	end

	VillageBridge = GetBridge()
	ReinforceHardTeams()
	PrepareBadGuy()
	ReinforceTanya()
	CreateInitialTriggers()
	CreateInitialObjectives()
	LinkCooperativeObjectives()
	CheckSovietDestruction()
end

CreateInitialObjectives = function()
	InitObjectives(Greece)
	if Difficulty == "hard" then
		SaveAllHostages = AddPrimaryObjective(Greece, "keep-all-hostages-alive")
	end
	FreeTheHostages = AddPrimaryObjective(Greece, "free-hostages")
	SaveAllHostages = SaveAllHostages or AddSecondaryObjective(Greece, "keep-all-hostages-alive")
	SurviveUntilEnd = AddPrimaryObjective(England, "")
	StopAllies = AddPrimaryObjective(USSR, "")
end

--[[
	Link Greece's win and victory notification to England's own victory.

	To reduce message spam, the creation of some primary objectives is delayed.
	That is done by making this a co-op mission between Greece and England
	(owner of the hostages). Because both must achieve their objectives, Greece
	can finish all primaries without immediately triggering victory.
]]
LinkCooperativeObjectives = function()
	local greeceActor = Greece.GetActorsByType("player")[1]
	Trigger.Clear(greeceActor, "OnPlayerWon")

	Trigger.OnPlayerWon(England, function()
		USSR.MarkFailedObjective(StopAllies)

		Trigger.AfterDelay(DateTime.Seconds(1), function()
			Media.PlaySpeechNotification(Greece, "MissionAccomplished")
		end)
	end)

	Trigger.AfterDelay(1, function()
		-- Triggers any time Greece finishes all CURRENT primary objectives.
		Trigger.OnPlayerWon(Greece, function()
			local sovietsDestroyed = DestroySoviets ~= nil and Greece.IsObjectiveCompleted(DestroySoviets)
			if sovietsDestroyed and EscortFinished then
				England.MarkCompletedObjective(SurviveUntilEnd)
			end
		end)
	end)
end

CheckSovietDestruction = function()
	local destroyed = USSR.HasNoRequiredUnits() and BadGuy.HasNoRequiredUnits()
	if not destroyed then
		Trigger.AfterDelay(DateTime.Seconds(1), CheckSovietDestruction)
		return
	end

	-- Cover unlikely case that all Soviets are destroyed with hostages in tow.
	DestroySoviets = DestroySoviets or AddPrimaryObjective(Greece, "destroy-soviet-units-infrastructure")
	Greece.MarkCompletedObjective(DestroySoviets)

	if EscortFinished and not Greece.IsObjectiveFailed(SaveAllHostages) then
		Greece.MarkCompletedObjective(SaveAllHostages)
	end
end

CheckAlliedDestruction = function()
	if #Greece.GetGroundAttackers() == 0 then
		MarkAlliedDefeat()
	end
end

MarkAlliedDefeat = function(objective, delay)
	if AlliesDefeated then
		return
	end

	StopCountdown()
	AlliesDefeated = true
	delay = delay or DateTime.Seconds(1)

	Trigger.AfterDelay(delay, function()
		if not Greece.IsObjectiveCompleted(FreeTheHostages) then
			Greece.MarkFailedObjective(SaveAllHostages)
		end

		if objective then
			Greece.MarkFailedObjective(objective)
			return
		end

		local mainObjectives = { FreeTheHostages, EscortTheHostages, DestroySoviets }
		Utils.Do(mainObjectives, function(o)
			if not Greece.IsObjectiveCompleted(o) then
				Greece.MarkFailedObjective(o)
			end
		end)
	end)
end

CheckEscortObjective = function()
	if EscortFinished then
		return
	end

	local maximum = Utils.Where(Hostages, IsAlive)
	if Church.PassengerCount < #maximum then
		return
	end
	OnHostagesEscorted()
end

CreateInitialTriggers = function()
	PrepareChurch()
	PrepareHostages()
	PrepareReveals()
	PrepareSovietGuards()
	PrepareForestEncounter()
	PrepareChronoTanks()
	PrepareBlockers()

	Trigger.OnKilled(ForwardCommand, OnForwardCommandKilled)

	local sams = { WestSam, EastSam }
	Trigger.OnAllKilled(sams, ReinforceLongbows)

	local guideHouseAttackers = { GuideRifleWest, GuideRifleEast }
	Trigger.OnAllKilled(guideHouseAttackers, OnGuideRiflesKilled)

	Trigger.OnEnteredProximityTrigger(TanyaDrop.CenterPosition, WDist.FromCells(4), function(actor, id)
		if not EscortFinished or actor.Type ~= TanyaType then
			return
		end

		Trigger.RemoveProximityTrigger(id)
		SignalAllies()
	end)

	local prisonApproached = false
	Trigger.OnEnteredProximityTrigger(Prison.CenterPosition, WDist.FromCells(8), function(actor, id)
		if prisonApproached or not IsGuideOrAllies(actor) then
			return
		end

		prisonApproached = true
		Trigger.RemoveProximityTrigger(id)
		ReinforceGuardHouse(actor.Type)
	end)

	local prisonBarrels = { PrisonBarrel1, PrisonBarrel2, PrisonBarrel3, PrisonBarrel4 }
	Trigger.OnAllKilled(prisonBarrels, function()
		local targets = { Prison, Executioner }
		Utils.Do(targets, function(target)
			if not target.IsDead then
				target.Kill("FireDeath")
			end
		end)
	end)
end

PrepareHostages = function()
	ScheduleExecutions()
	Trigger.OnKilled(Executioner, FreeHostages)
	Trigger.OnAllKilled(Hostages, OnAllHostagesKilled)
	Utils.Do(Hostages, function(hostage)
		Trigger.OnKilled(hostage, OnHostageKilled)
	end)

	-- Keep hostages wandering, but only inside the pen.
	Trigger.OnEnteredProximityTrigger(Executioner.CenterPosition, WDist.FromCells(2), function(actor, id)
		if Executioner.IsDead then
			Trigger.RemoveProximityTrigger(id)
			return
		end
		if actor.Owner ~= Neutral then
			return
		end

		actor.Stop()
		actor.Move(HostageCenter.Location)
	end)
end

Tick = function()
	if TimeRemaining < 1 then
		return
	end
	TimeRemaining = TimeRemaining - 1

	if TimeRemaining % DateTime.Seconds(1) ~= 0 then
		return
	end

	local text = UserInterface.GetFluentMessage("hostage-dies-in", { ["time"] = Utils.FormatTime(TimeRemaining) })
	UserInterface.SetMissionText(text, TimerColor)
end

PrepareCountdown = function(interval)
	local text = UserInterface.GetFluentMessage("hostage-dies-in", { ["time"] = Utils.FormatTime(interval) })
	UserInterface.SetMissionText(text, TimerColor)
	DateTime.TimeLimit = 1

	Trigger.OnTimerExpired(function()
		local survivors = Utils.Where(Hostages, IsAlive)
		if #survivors > 1 then
			ResetCountdown(interval)
			return
		end
		UserInterface.SetMissionText("")
	end)
end

ResetCountdown = function(interval)
	DateTime.TimeLimit = interval
	TimeRemaining = interval
	TimerColor = HSLColor.White

	Trigger.AfterDelay(interval - DateTime.Minutes(2), function()
		TimerColor = USSR.Color
	end)
end

StopCountdown = function()
	DateTime.TimeLimit = 0
	TimeRemaining = 0
	UserInterface.SetMissionText("")
end

ScheduleExecutions = function()
	local intervals =
	{
		easy = 5,
		normal = 4,
		hard = 3,
	}
	-- -1 tick avoids the redundant x-minute warning speech upon timer refresh.
	local interval = DateTime.Minutes(intervals[Difficulty]) - 1
	local delay = 0

	PrepareCountdown(interval)

	Utils.Do(Hostages, function(hostage)
		delay = delay + interval

		Trigger.AfterDelay(delay, function()
			ExecuteHostage(hostage)
		end)
	end)
end

ExecuteHostage = function(hostage)
	if hostage.IsDead then
		local survivors = Utils.Where(Hostages, IsAlive)
		if #survivors > 0 then
			hostage = Utils.Random(survivors)
		end
	end

	if Executioner.IsDead or hostage.IsDead then
		return
	end

	Media.PlaySoundNotification(Greece, "HostageShot")
	hostage.Kill("DefaultDeath")
end

FreeHostages = function()
	StopCountdown()
	ReinforceNorthChinook()
	Greece.MarkCompletedObjective(FreeTheHostages)

	Trigger.AfterDelay(DateTime.Seconds(3), function()
		EscortTheHostages = AddPrimaryObjective(Greece, "get-hostages-to-church")
	end)

	local liveHostages = Utils.Where(Hostages, IsAlive)
	Utils.Do(liveHostages, function(hostage)
		hostage.Owner = England
		FollowTanya(hostage)
	end)

	local guide = GetGuide()
	if guide then
		guide.Stop()
		FollowTanya(guide)
	end
end

FollowTanya = function(actor)
	-- Hostages' panic can make them forget orders; OnIdle will refresh them.
	-- For the same reason, the Guide elsewhere uses OnIdle for his actions.
	Trigger.OnIdle(actor, function()
		if Tanya.IsDead then
			return
		end

		actor.Guard(Tanya)
	end)
end

PrepareForestEncounter = function()
	ForestTeamReachedHouse = false
	local patrolPassed = false

	local forestFoot = Trigger.OnEnteredFootprint({ ForestSafetyCheck.Location }, function(actor, id)
		if patrolPassed or actor.Owner ~= USSR then
			return
		end

		patrolPassed = true
		Trigger.RemoveFootprintTrigger(id)
		GuideToVillage()
	end)

	Trigger.OnAllKilled(ForestTeam, function()
		if patrolPassed then
			return
		end

		patrolPassed = true
		Trigger.RemoveFootprintTrigger(forestFoot)
		GuideToVillage(nil, true)
	end)

	Trigger.OnEnteredFootprint({ ForestCenter.Location }, function(actor, id)
		if not IsGuide(actor) then
			return
		end

		Trigger.RemoveFootprintTrigger(id)

		Trigger.AfterDelay(0, function()
			GuideToHideout(actor)
		end)
	end)

	Trigger.OnExitedFootprint({ ForestHideout.Location }, function(actor, id)
		if Executioner.IsDead or actor.IsDead or not IsGuide(actor) then
			return
		end

		Trigger.RemoveFootprintTrigger(id)
		Media.DisplayMessage(UserInterface.GetFluentMessage("guide-follow-me"), actor.TooltipName)
	end)

	Trigger.OnEnteredFootprint({ ForestSouthwest.Location }, function(actor, id)
		if actor.Type ~= "dog" then
			return
		end

		Trigger.RemoveFootprintTrigger(id)

		Trigger.AfterDelay(DateTime.Seconds(1), function()
			if not actor.IsDead then
				Media.PlaySoundNotification(Greece, "DogWhine")
			end
		end)
	end)

	Trigger.OnEnteredFootprint({ GuideHouseReveal.Location }, function(actor, id)
		if actor.Type ~= "dog" then
			return
		end

		ForestTeamReachedHouse = true
		Trigger.RemoveFootprintTrigger(id)
	end)
end

PrepareChronoTanks = function()
	local sides =
	{
		westRoad =
		{
			cells = { CPos.New(41, 65), CPos.New(42, 65), CPos.New(43, 65), CPos.New(44, 65), CPos.New(45, 65), CPos.New(46, 65) },
			spawns = { ChronoEntryWest1.Location, ChronoEntryWest2.Location }
		},
		eastRoad =
		{
			cells = { CPos.New(66, 70), CPos.New(66, 71), CPos.New(67, 71), CPos.New(68, 71), CPos.New(69, 71), CPos.New(70, 71), CPos.New(71, 71), CPos.New(72, 71), CPos.New(72, 71), CPos.New(73, 71) },
			spawns = { ChronoEntryEast1.Location, ChronoEntryEast2.Location }
		}
	}

	Utils.Do(sides, function(side)
		Trigger.OnEnteredFootprint(side.cells, function(actor, id)
			local signaled = SignalForReinforcements and Greece.IsObjectiveCompleted(SignalForReinforcements)
			if not signaled or actor.Owner ~= Greece then
				return
			end

			Trigger.RemoveFootprintTrigger(id)
			ReinforceChronoTanks(side.spawns)
		end)
	end)
end

PrepareSovietGuards = function()
	Utils.Do(BadGuy.GetGroundAttackers(), function(soviet)
		Trigger.OnDamaged(soviet, function(_, attacker)
			if attacker.Type == "dtrk" or attacker.Owner ~= Greece then
				return
			end

			Trigger.Clear(soviet, "OnDamaged")
			IdleHunt(soviet)
		end)
	end)

	local beachAlerted = false
	local beachGroup = { SouthBeachGuard1, SouthBeachGuard2, SouthBeachGuard3, SouthBeachGuard4 }
	Trigger.OnAllKilled(beachGroup, SovietSouthBeachCamera.Destroy)

	Trigger.OnAnyKilled(beachGroup, function()
		if beachAlerted or Tanya.IsDead then
			return
		end

		beachAlerted = true
		GroupIdleHunt(beachGroup)

		Utils.Do(beachGroup, function(actor)
			if actor.IsDead then
				return
			end
			-- Get attack dogs sprinting if they aren't already.
			actor.Attack(Tanya)
		end)
	end)

	local others =
	{
		{ RoadTurretRifle1, RoadTurretRifle2, RoadTurretWest, RoadTurretEast },
		{ GuideRifleWest, GuideRifleEast },
		{ FarmGuard1, FarmGuard2, FarmGuard3, FarmGuard4 },
		SoutheastTurretGuards,
		ForestTeam,
		BlockerTeam
	}

	Utils.Do(others, function(group)
		GroupHuntOnDamaged(group, Greece)
	end)
end

PrepareMainReveals = function()
	local mainReveals =
	{
		roadTurrets =
		{
			cells = { CPos.New(36, 71), CPos.New(36, 72), CPos.New(36, 73), CPos.New(37, 73), CPos.New(38, 73), CPos.New(39, 73), CPos.New(40, 73), CPos.New(41, 73), CPos.New(42, 73), CPos.New(43, 73), CPos.New(44, 73), CPos.New(45, 73), CPos.New(46, 73), CPos.New(47, 73) },
			location = RoadTurretReveal.Location
		},
		southBeachBarrels =
		{
			cells = { CPos.New(51, 75), CPos.New(51, 76), CPos.New(51, 77), CPos.New(51, 78), CPos.New(51, 79) },
			location = SouthBeachReveal.Location,
			onTriggered = SovietStartCamera.Destroy
		},
		southeastTurret =
		{
			cells = { CPos.New(68, 82), CPos.New(68, 83), CPos.New(68, 84), CPos.New(68, 85), CPos.New(68, 86), CPos.New(68, 87), CPos.New(68, 88), CPos.New(68, 89) },
			location = SoutheastTurret.Location,
			onTriggered = function()
				local dogs = Map.ActorsWithTag("TurretDog")
				GroupAttackMove(dogs, SoutheastTurret.Location + CVec.New(0, 1))
			end
		},
		samFence =
		{
			cells = { CPos.New(69, 74), CPos.New(70, 74), CPos.New(71, 74), CPos.New(72, 74), CPos.New(73, 74), CPos.New(74, 74) },
			location = SamFenceReveal.Location,
			onTriggered = ReinforceVillagePatrol
		},
		riverHouse =
		{
			cells = { CPos.New(80, 79), CPos.New(80, 80), CPos.New(80, 81), CPos.New(80, 82), CPos.New(80, 83) },
			location = GuideHouse.Location,
			type = "camera.paradrop",
			onTriggered = function()
				ReinforceVillagePatrol()
				OrderGuideRifles()
			end
		},
		forest =
		{
			cells = { CPos.New(85, 62), CPos.New(86, 62), CPos.New(87, 62), CPos.New(88, 62), CPos.New(89, 62), CPos.New(90, 62), CPos.New(91, 62), CPos.New(92, 62), CPos.New(93, 62), CPos.New(94, 62) },
			location = ForestCenter.Location,
			duration = DateTime.Seconds(20),
			onTriggered = function()
				OrderForestPatrol(DateTime.Seconds(3))
				SpawnPlayerCamera(ForestPatrolStart.Location, DateTime.Seconds(6), "camera")
			end
		},
		forestTeamBackAtForest =
		{
			location = ForestCenter.Location,
			type = "camera.tiny",
			condition = function(actor)
				return ForestTeamReachedHouse and actor.Type == "dog"
			end
		},
		forestTeamBackAtStart =
		{
			location = ForestPatrolStart.Location,
			type = "camera.small",
			condition = function(actor)
				return ForestTeamReachedHouse and actor.Type == "dog"
			end
		},
		forestTeamAtBridge =
		{
			location = VillageBridgeNortheast.Location,
			type = "camera.small",
			condition = function(actor)
				return ForestTeamReachedHouse and actor.Type == "dog"
			end
		}
	}

	Utils.Do(mainReveals, function(reveal)
		local triggered = false
		local isCorrect = reveal.condition or function(actor)
			return IsGuideOrAllies(actor)
		end

		Trigger.OnEnteredFootprint(reveal.cells or { reveal.location }, function(actor, id)
			if triggered or not isCorrect(actor) then
				return
			end

			triggered = true
			Trigger.RemoveFootprintTrigger(id)

			if reveal.location then
				SpawnPlayerCamera(reveal.location, reveal.duration, reveal.type)
			end

			if reveal.onTriggered then
				reveal.onTriggered()
			end
		end)
	end)
end

PrepareBlockers= function()
	local houseReached = false

	Trigger.OnEnteredProximityTrigger(BlockerReturnProximity.CenterPosition, WDist.FromCells(2), function(actor, id)
		if not Executioner.IsDead or actor.Owner ~= Greece then
			return
		end

		Trigger.RemoveProximityTrigger(id)
		BlockersToBridgePatrol()
	end)

	Trigger.OnEnteredProximityTrigger(GuideHouseReveal.CenterPosition, WDist.FromCells(2), function(actor, id)
		if BlockerTank.IsDead then
			Trigger.RemoveProximityTrigger(id)
			return
		end

		if not Executioner.IsDead or actor ~= BlockerTank then
			return
		end

		houseReached = true
		Trigger.RemoveProximityTrigger(id)
	end)

	-- For BlockerTeam returning north from the church/Guide house area.
	Trigger.OnEnteredProximityTrigger(SouthRiver.CenterPosition, WDist.FromCells(3), function(actor, id)
		if BlockerTank.IsDead then
			Trigger.RemoveProximityTrigger(id)
			return
		end

		if not houseReached or not Executioner.IsDead or actor ~= BlockerTank then
			return
		end

		Trigger.RemoveProximityTrigger(id)
		SpawnPlayerCamera(SouthRiver.Location, DateTime.Seconds(6), "camera.tiny")
		SpawnPlayerCamera(ForestCenter.Location, DateTime.Seconds(20))
	end)
end

PrepareReveals = function()
	PrepareMainReveals()

	Trigger.OnEnteredProximityTrigger(Prison.CenterPosition, WDist.FromCells(10), function(actor, id)
		if not IsGuideOrAllies(actor) then
			return
		end

		Trigger.RemoveProximityTrigger(id)
		SpawnPlayerCamera(PrisonReveal.Location, DateTime.Seconds(20))
		BlockersToGuideHouse()

		local delay = DateTime.Seconds(1)
		if actor.Type == TanyaType then
			delay = 5
		end
		Trigger.AfterDelay(delay, OrderGeneralRetreat)
	end)

	Trigger.OnKilled(SovietDemoTruck, function()
		if not SovietDemoTruck.IsIdle then
			return
		end
		SpawnPlayerCamera(SovietDemoTruck.Location, DateTime.Seconds(1), "camera.paradrop")
	end)

	local otherExplosions =
	{
		{
			actors = { SouthBeachPump1, SouthBeachPump2 },
			origin = BeachExplosionReveal.Location
		},
		{
			actors = { PrisonPump, PrisonBarrel1, PrisonBarrel2, PrisonBarrel3, PrisonBarrel4 },
			origin = PrisonPump.Location
		},
		{
			actors = { DemoPump1, DemoPump2, DemoPump3, DemoHouse },
			origin = DemoBarrel3.Location
		},
		{
			actors = { NorthBeachPump2 },
			origin = NorthBeachPump2.Location
		},
		{
			actors = { LakePump1, LakePump2 },
			origin = LakeExplosionReveal.Location
		},
	}

	Utils.Do(otherExplosions, function(group)
		PrepareExplosionReveal(group.actors, group.origin, DateTime.Seconds(1))
	end)
end

PrepareExplosionReveal = function(actors, origin, duration)
	local revealed = false

	Utils.Do(actors, function(actor)
		Trigger.OnDamaged(actor, function(_, attacker)
			if revealed or (attacker.Type ~= "barl" and attacker.Type ~= "brl3") then
				return
			end

			revealed = true
			SpawnPlayerCamera(origin, duration, "camera.small")
		end)
	end)
end

PrepareChurch = function()
	Trigger.OnKilled(Church, OnChurchKilled)
	Trigger.OnPassengerEntered(Church, CheckEscortObjective)

	Trigger.OnEnteredProximityTrigger(Church.CenterPosition, WDist.FromCells(4), function(actor)
		local civilian = IsHostage(actor) or IsGuide(actor)
		if civilian then
			EnterChurch(actor)
		end
	end)
end

EnterChurch = function(actor)
	if Church.IsDead then
		return
	end

	actor.Stop()
	actor.Move(ChurchRally.Location)
	if IsGuide(actor) then
		actor.Infiltrate(Church)
		return
	end
	actor.EnterTransport(Church)
end

StartFireSale = function(player)
	-- Short delay in case the Soviets' Tech Center must change owner first.
	Trigger.AfterDelay(1, function()
		local buildings = Utils.Where(player.GetActors(), function(actor)
			return actor.HasProperty("StartBuildingRepairs")
		end)

		if #buildings == 0 then
			return
		end

		Utils.Do(buildings, function(building)
			building.Sell()
		end)

		Trigger.OnAllRemovedFromWorld(buildings, function()
			GroupIdleHunt(player.GetGroundAttackers())
		end)
	end)
end

SignalAllies = function()
	Greece.MarkCompletedObjective(SignalForReinforcements)
	SpawnFlare(TanyaDrop.Location, DateTime.Minutes(4))
	Trigger.AfterDelay(DateTime.Seconds(1), ReinforceAllies)

	if General.IsDead then
		OrderBadGuyHunters()
		return
	end
	Trigger.OnKilled(General, OrderBadGuyHunters)
end

GroupAttackMove = function(actors, location, closeEnough)
	Utils.Do(actors, function(actor)
		if actor.IsDead then
			return
		end
		actor.AttackMove(location, closeEnough or 0)
	end)
end

GroupIdleHunt = function(actors)
	Utils.Do(actors, IdleHunt)
end

-- Patrol along path. Pause at each location until others arrive.
-- At final location, call onFinished(actors) or loop and restart.
GroupTightPatrol = function(actors, path, looped, pauseTime, onFinished)
	pauseTime = pauseTime or 0
	local paused = false
	local goal = 1
	local arrived = { }
	local patrollers = Utils.Where(actors, IsAlive)

	for id = 1, #patrollers do
		Trigger.OnIdle(patrollers[id], function(actor)
			if paused then
				return
			end

			-- Move each unit to the goal until their arrival or death.
			if not arrived[id] then
				actor.AttackMove(path[goal], 2)
				actor.CallFunc(function()
					arrived[id] = true
				end)
				return
			end

			if not AreAllIdleOrDead(patrollers) then
				return
			end

			-- All live actors have arrived and are idle.
			paused = true
			Trigger.AfterDelay(pauseTime, function()
				paused = false
			end)

			arrived = { }
			local nextLocation, patrolFinished = NextPatrolLocation(goal, #path, looped)

			if patrolFinished then
				ClearTightPatrol(patrollers, onFinished)
				return
			end

			goal = nextLocation
		end)
	end
end

-- Fetch the next goal in a patrol path, or signal the end of a one-way patrol.
NextPatrolLocation = function(current, final, looped)
	if current < final then
		return current + 1, false
	end

	if looped then
		return 1, false
	end

	return current, true
end

-- Clear a group's TightPatrol and give orders queued for that patrol's finish.
ClearTightPatrol = function(actors, onFinished)
	Utils.Do(actors, function(actor)
		if actor.IsDead then
			return
		end

		Trigger.Clear(actor, "OnIdle")
	end)

	if not onFinished then
		return
	end

	Trigger.AfterDelay(1, function()
		onFinished(actors)
	end)
end

GroupHuntOnDamaged = function(actors, targetPlayer)
	local alerted = false
	Utils.Do(actors, function(actor)
		if actor.IsDead then
			return
		end

		Trigger.OnDamaged(actor, function(_, attacker)
			if alerted or attacker.Type == "dtrk" or attacker.Owner ~= targetPlayer then
				return
			end
			alerted = true

			Utils.Do(actors, function(hunter)
				if hunter.IsDead or not hunter.HasProperty("Hunt") then
					return
				end
				-- If the hunter is patrolling, their patrol will be aborted.
				hunter.Stop()
				Trigger.Clear(hunter, "OnIdle")

				Trigger.AfterDelay(1, function()
					IdleHunt(hunter)
				end)
			end)
		end)
	end)
end

OrderForestPatrol = function(delay)
	local path =
	{
		ForestNorthwest.Location,
		ForestSouthwest.Location,
		SouthRiver.Location,
		GuideHouseReveal.Location,
		ForestCenter.Location,
		ForestPatrolStart.Location,
		VillageBridgeNortheast.Location,
		VillageNortheast.Location,
		PrisonReveal.Location,
		BadGuyRally.Location
	}

	Trigger.AfterDelay(delay, function()
		GroupTightPatrol(ForestTeam, path, false)
	end)
end

BlockersToGuideHouse = function()
	local path =
	{
		ForestNorthwest.Location,
		SouthRiver.Location,
		GuideHouseReveal.Location
	}
	GroupTightPatrol(BlockerTeam, path, false)
end

BlockersToBridgePatrol = function()
	local path =
	{
		SouthRiver.Location,
		ForestSouthwest.Location,
		ForestNorthwest.Location,
		ForestPatrolStart.Location,
		VillageBridgeNortheast.Location,
		ForestPatrolStart.Location,
		ForestNorthwest.Location,
		ForestSouthwest.Location
	}
	GroupTightPatrol(BlockerTeam, path, true)
end

SpawnGuide = function()
	Trigger.AfterDelay(15, function()
		if GuideHouse.IsDead then
			return
		end

		local guide = Actor.Create("c1", true, { Owner = GoodGuy, Location = GuideHouse.Location, SubCell = 4, Facing = Angle.South } )
		GuideToForest(guide)
	end)
end

GuideToForest = function(guide)
	guide.Move(GuideHouse.Location + CVec.New(0, 1))

	guide.CallFunc(function()
		Media.DisplayMessage(UserInterface.GetFluentMessage("guide-thank-you"), guide.TooltipName)
	end)

	guide.Move(SouthRiver.Location)
	guide.Move(ForestSouthwest.Location)
	guide.Move(ForestCenter.Location)
end

GuideToHideout = function(guide)
	if IsGroupDead(ForestTeam) then
		-- If this team dies, the Guide will skip ahead to GuideToVillage.
		return
	end

	guide.CallFunc(function()
		Media.DisplayMessage(UserInterface.GetFluentMessage("guide-patrol-coming"), guide.TooltipName)
	end)

	guide.Wait(DateTime.Seconds(2))

	guide.CallFunc(function()
		if IsGroupDead(ForestTeam) then
			return
		end

		Media.DisplayMessage(UserInterface.GetFluentMessage("guide-come-this-way"), guide.TooltipName)
		guide.Move(ForestHideout.Location)
	end)
end

GuideToVillage = function(guide, patrolKilled)
	guide = guide or GetGuide()
	if not guide then
		return
	end

	guide.Stop()
	Media.PlaySoundNotification(Greece, "GuideOkay")
	Media.DisplayMessage(UserInterface.GetFluentMessage("guide-safe-to-move"), guide.TooltipName)
	if not patrolKilled then
		guide.Wait(DateTime.Seconds(1))
	end

	if VillageBridge.IsDead then
		GuideToBackdoor(guide)
		return
	else
		Trigger.OnKilled(VillageBridge, function()
			GuideToBackdoor(guide)
		end)
	end

	guide.Move(ForestNorthwest.Location)
	guide.Move(VillageBridgeNortheast.Location)

	Trigger.OnIdle(guide, function()
		guide.AttackMove(PrisonIntersection.Location)
		guide.CallFunc(function()
			GuideToHostages(guide)
		end)
	end)
end

GuideToBackdoor = function(guide)
	if guide.IsDead or Greece.IsObjectiveCompleted(FreeTheHostages) then
		return
	end

	Trigger.Clear(guide, "OnIdle")
	Trigger.AfterDelay(1, function()
		if guide.IsDead then
			return
		end

		guide.Stop()
		Trigger.OnIdle(guide, function()
			guide.AttackMove(GuideBackdoorGoal.Location)
			guide.CallFunc(function()
				GuideToHostages(guide)
			end)
		end)
	end)
end

GuideToHostages = function(guide)
	if Executioner.IsDead or PrisonBarrel2.IsDead or PrisonBarrel3.IsDead then
		return
	end

	-- To compensate for the guards' better speed/range with minimal changes,
	-- the Guide is made untargetable until actors are in position (or dead).
	local ghost = guide.GrantCondition("untargetable")
	Trigger.Clear(guide, "OnIdle")

	Trigger.OnEnteredProximityTrigger(PrisonBarrel3.CenterPosition, WDist.FromCells(2), function(actor, id)
		if Executioner.IsDead or PrisonBarrel2.IsDead or guide.IsDead then
			Trigger.RemoveProximityTrigger(id)
			return
		end

		if actor.Type ~= "e1" or guide.Location ~= GuideBarrelGoal.Location then
			return
		end

		Trigger.RemoveProximityTrigger(id)
		guide.Stop()
		guide.Attack(PrisonBarrel2)
	end)

	guide.Move(GuideBarrelGoal.Location)
	local revokeTargets = Utils.Where({ Executioner, PrisonBarrel1, PrisonBarrel2, PrisonBarrel3, PrisonBarrel4 }, IsAlive)

	Trigger.OnAnyKilled(revokeTargets, function()
		if guide.IsDead then
			return
		end

		guide.RevokeCondition(ghost)
	end)
end

OrderGeneralRetreat = function()
	if General.IsDead or not General.IsIdle then
		return
	end

	local reinforcementTimer = DateTime.Seconds(30)

	General.Move(BadGuyRally.Location)
	General.Move(GeneralRally.Location + CVec.New(0, 3))

	General.CallFunc(function()
		local camera = SpawnPlayerCamera(GeneralRally.Location, reinforcementTimer)

		Trigger.OnKilled(General, function()
			RemoveActor(camera)
		end)
	end)

	General.Move(GeneralRally.Location)
	General.CallFunc(function()
		Trigger.AfterDelay(reinforcementTimer, ReinforceBadGuy)
	end)
end

OrderGuideRifles = function()
	local rifles = { GuideRifleWest, GuideRifleEast }
	local offset = 0

	Utils.Do(rifles, function(rifle)
		Trigger.AfterDelay(offset, function()
			if rifle.IsDead or GuideHouse.IsDead then
				return
			end

			rifle.Attack(GuideHouse, true, true)
		end)

		offset = offset + 8
	end)
end

OrderBadGuyHunters = function()
	local blockers = Utils.Where(BlockerTeam, IsAlive)
	ClearTightPatrol(blockers, function(actors)
		GroupAttackMove(actors, WestRoadRally.Location, 2)
		GroupIdleHunt(actors)
	end)

	local others = { SovietDemoTruck, DemoFlamer1, DemoFlamer2, ForwardCliffGuard2 }
	Utils.Do(others, function(other)
		if other.IsDead then
			return
		end

		other.AttackMove(WestRoadRally.Location)
		IdleHunt(other)
	end)
end

AreAllIdleOrDead = function(actors)
	return Utils.All(actors, function(actor)
		return actor.IsIdle or actor.IsDead
	end)
end

GetBridge = function()
	local bridges = Neutral.GetActorsByType("bridge1")
	return bridges[1]
end

GetGuide = function()
	local guides = GoodGuy.GetActorsByType("c1")
	return guides[1]
end

IsAlive = function(actor)
	return not actor.IsDead
end

IsGroupDead = function(actors)
	return Utils.All(actors, function(actor)
		return actor.IsDead
	end)
end

IsGuide = function(actor)
	return actor.Type == "c1"
end

IsGuideOrAllies = function(actor)
	return actor.Owner == Greece or IsGuide(actor)
end

IsHostage = function(actor)
	return actor.Owner == England
end

SpawnPlayerCamera = function(location, duration, type, delay)
	duration = duration or DateTime.Seconds(6)
	type = type or "camera"
	return SpawnMiscActor(type, GoodGuy, location, duration, delay)
end

SpawnFlare = function(location, duration, delay)
	return SpawnMiscActor("flare", England, location, duration, delay)
end

-- Spawn a supporting actor with optional delay and self-removal.
SpawnMiscActor = function(type, owner, location, duration, delay)
	local actor = Actor.Create(type, false, { Owner = owner, Location = location or CPos.New(0, 0) })

	if delay then
		Trigger.AfterDelay(delay, function()
			actor.IsInWorld = true
		end)
	else
		actor.IsInWorld = true
	end

	if duration and duration > 0 then
		RemoveActor(actor, duration)
	end

	return actor
end

RemoveActor = function(actor, delay)
	Trigger.AfterDelay(delay or 0, function()
		if not actor or not actor.IsInWorld then
			return
		end
		actor.Destroy()
	end)
end

OnHostageKilled = function()
	if Greece.GetObjectiveType(SaveAllHostages) == "Primary" then
		MarkAlliedDefeat(SaveAllHostages)
		return
	end

	Greece.MarkFailedObjective(SaveAllHostages)
	CheckEscortObjective()
end

OnAllHostagesKilled = function()
	Media.PlaySoundNotification(Greece, "AlertBleep")
	Media.DisplayMessage(UserInterface.GetFluentMessage("all-hostages-killed"))
	MarkAlliedDefeat(EscortTheHostages or FreeTheHostages)
end

OnHostagesEscorted = function()
	EscortFinished = true
	Media.PlaySpeechNotification(Greece, "ObjectiveMet")
	Greece.MarkCompletedObjective(EscortTheHostages)

	local delay = DateTime.Seconds(3)
	if DestroySoviets then
		delay = 5
		if not Greece.IsObjectiveFailed(SaveAllHostages) then
			Greece.MarkCompletedObjective(SaveAllHostages)
		end
	end

	Trigger.AfterDelay(delay, function()
		DestroySoviets = DestroySoviets or AddPrimaryObjective(Greece, "destroy-soviet-units-infrastructure")
		SignalForReinforcements = AddSecondaryObjective(Greece, "signal-for-reinforcements")
	end)
end

OnChurchKilled = function()
	Media.PlaySoundNotification(Greece, "AlertBleep")
	Media.DisplayMessage(UserInterface.GetFluentMessage("church-destroyed"))
	MarkAlliedDefeat(EscortTheHostages, DateTime.Seconds(2))
end

OnForwardCommandKilled = function()
	if not BadGuyReinforced then
		PrepareTechSale()
	end

	StartFireSale(USSR)

	local forwardBaseGuards = { ForwardRifle1, ForwardRifle2, ForwardGrenadier, ForwardCliffGuard1, ForwardCliffGuard2, TechTank }
	GroupIdleHunt(forwardBaseGuards)
end

OnGuideRiflesKilled = function()
	if not GuideHouse.IsDead then
		SpawnGuide()
	end
end

OnTanyaKilled = function(_, killer)
	CheckAlliedDestruction()

	if killer.Type == "v2rl" and IsAlive(killer) then
		SpawnPlayerCamera(killer.Location, DateTime.Minutes(1), "camera.tiny")
	end

	if not EscortFinished then
		local liveHostages = Utils.Where(Hostages, IsAlive)
		Utils.Do(liveHostages, function(hostage)
			hostage.Panic()
		end)
	end
end