--[[
   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.
]]

OrdosBase = { OConYard, OOutpost, OPalace, ORefinery1, ORefinery2, OHeavyFactory, OLightFactory, OHiTechFactory, OResearch, ORepair, OStarport, OGunt1, OGunt2, OGunt3, OGunt4, OGunt5, OGunt6, ORock1, ORock2, ORock3, ORock4, OBarracks1, OBarracks2, OPower1, OPower2, OPower3, OPower4, OPower5, OPower6, OPower7, OPower8, OPower9, OPower10, OPower11, OPower12, OPower13 }

AtreidesBase = { AConYard,ABarracks1, ABarracks2, AOutpost, ARefinery1, ARefinery2, AHeavyFactory, ALightFactory, AHiTechFactory, ARepair, AStarport, AGunt1, AGunt2, ARock1, ARock2, APower1, APower2, APower3, APower4, APower5, APower6, APower7, APower8, APower9 }

MercenaryBase = { MHeavyFactory, MStarport, MGunt, MPower1, MPower2 }

OrdosReinforcements =
{
	easy =
	{
		{ "trooper", "trooper", "quad", "quad" },
		{ "light_inf", "light_inf", "light_inf", "light_inf", "light_inf" },
		{ "light_inf", "light_inf", "light_inf", "raider", "raider" },
		{ "combat_tank_o", "quad" }
	},

	normal =
	{
		{ "trooper", "trooper", "trooper", "quad", "quad" },
		{ "light_inf", "light_inf", "light_inf", "light_inf", "light_inf", "light_inf" },
		{ "light_inf", "light_inf", "light_inf", "light_inf", "raider", "raider" },
		{ "combat_tank_o", "combat_tank_o" },
		{ "raider", "raider", "quad", "quad", "deviator" }
	},

	hard =
	{
		{ "trooper", "trooper", "trooper", "trooper", "quad", "quad" },
		{ "light_inf", "light_inf", "light_inf", "light_inf", "light_inf", "light_inf", "light_inf" },
		{ "light_inf", "light_inf", "light_inf", "light_inf", "light_inf", "raider", "raider" },
		{ "combat_tank_o", "combat_tank_o", "quad" },
		{ "raider", "raider", "raider", "quad", "quad", "deviator" },
		{ "siege_tank", "combat_tank_o", "combat_tank_o", "raider" }
	}
}

MercenaryStarportReinforcements =
{
	{ "trooper", "trooper", "trooper", "trooper", "trooper", "trooper", "quad", "quad" },
	{ "quad", "combat_tank_o", "trike", "quad", "trooper", "trooper" },
	{ "trooper", "trooper", "trooper", "trooper", "siege_tank", "siege_tank" },
	{ "quad", "quad", "combat_tank_o", "combat_tank_o", "combat_tank_o" }
}

OrdosAttackDelay =
{
	easy = DateTime.Minutes(3),
	normal = DateTime.Minutes(2) + DateTime.Seconds(20),
	hard = DateTime.Minutes(1)
}

MercenaryStarportDelay = 4970

OrdosAttackWaves =
{
	easy = 4,
	normal = 5,
	hard = 6
}

InitialOrdosReinforcements =
{
	{ "trooper", "trooper", "trooper", "trooper", "light_inf", "light_inf", "light_inf" },
	{ "trooper", "trooper", "trooper", "trooper", "trooper", "combat_tank_o", "combat_tank_o" }
}

InitialAtreidesReinforcements = { "combat_tank_a", "combat_tank_a", "quad", "quad", "trike" }

InitialMercenaryReinforcements = { "trooper", "trooper", "trooper", "trooper", "quad", "quad" }

OrdosPaths =
{
	{ OrdosEntry1.Location, OrdosRally1.Location },
	{ OrdosEntry2.Location, OrdosRally2.Location },
	{ OrdosEntry3.Location, OrdosRally3.Location },
	{ OrdosEntry4.Location, OrdosRally4.Location }
}

InitialOrdosPaths =
{
	{ OLightFactory.Location, OrdosRally5.Location },
	{ OHiTechFactory.Location, OrdosRally6.Location }
}

SaboteurPaths =
{
	{ SaboteurWaypoint1.Location, SaboteurWaypoint2.Location, SaboteurWaypoint3.Location },
	{ SaboteurWaypoint4.Location, SaboteurWaypoint5.Location, SaboteurWaypoint6.Location },
	{ SaboteurWaypoint1.Location, OrdosPatrolPoint2.Location, OrdosRally1.Location, SaboteurWaypoint6.Location },
	{ OrdosRally4.Location, OrdosPatrolPoint3.Location, OrdosPatrolPoint2.Location}
}

InitialAtreidesPath = { AStarport.Location, AtreidesRally.Location }

InitialMercenaryPath = { MStarport.Location, MercenaryRally.Location }

SendStarportReinforcements = function(faction)
	Trigger.AfterDelay(MercenaryStarportDelay, function()
		if MStarport.IsDead or MStarport.Owner ~= faction then
			return
		end

		local reinforcements = Utils.Random(MercenaryStarportReinforcements)

		local units = Reinforcements.ReinforceWithTransport(faction, "frigate", reinforcements, { MercenaryStarportEntry.Location, MStarport.Location + CVec.New(1, 1) }, { MercenaryStarportExit.Location })[2]
		Utils.Do(units, function(unit)
			unit.AttackMove(MercenaryAttackLocation)
			IdleHunt(unit)
		end)

		SendStarportReinforcements(faction)
	end)
end

AirStrikeTimer = 7500
AirStrikeChargeTime = 7500
AirstrikeLogic = function(airstrikeProvider)
	if airstrikeProvider.IsDead then
		return
	end
	if DateTime.GameTime <= AirStrikeTimer then
		Trigger.AfterDelay(AirStrikeTimer - DateTime.GameTime + 1, function()
			AirstrikeLogic(airstrikeProvider)
		end)
		return
	end

	-- randomly choose if wait again or strike. During waiting Airstrike can still be used by DefensiveAirStrike
	if Utils.RandomInteger(1, 100) < 30 then
		Trigger.AfterDelay(1000, function() AirstrikeLogic(airstrikeProvider)end)
	else
		AirStrikeVSBuilding(airstrikeProvider)
		Trigger.AfterDelay(7500, function() AirstrikeLogic(airstrikeProvider) end)
		IsAirstrikeReady = false
	end
end

AirStrikeVSBuilding = function(airstrikeProvider)
	if airstrikeProvider.IsDead or  DateTime.GameTime < AirStrikeTimer  then
		return
	end

	local targets = Utils.Where(Harkonnen.GetActors(), function(actor)
		return actor.HasProperty("Sell") and
			actor.Type ~= "wall" and
			actor.Type ~= "medium_gun_turret" and
			actor.Type ~= "large_gun_turret" and
			actor.Type ~= "silo" and
			actor.Type ~= "wind_trap"
	end)

	if #targets > 0 then
		airstrikeProvider.TargetAirstrike(Utils.Random(targets).CenterPosition)
		AirStrikeTimer =  DateTime.GameTime + AirStrikeChargeTime
	end
end

DefensiveAirStrike = function(airstrikeProvider, possibleTargets)
	if airstrikeProvider.IsDead or DateTime.GameTime <= AirStrikeTimer then return end
	local bestValue = {}
	local bestIndex = 1
	for i = 1, #possibleTargets, 1 do
		local ActorsInCircle = Map.ActorsInCircle(possibleTargets[i].CenterPosition, WDist.FromCells(4), function(a)
			return
				a.Owner == Harkonnen
				and not a.IsDead
				and a.HasProperty("Attack")
		end)

		bestValue[i] = 0
		Utils.Do(ActorsInCircle, function(a)
			bestValue[i] = bestValue[i] + Actor.Cost(a.Type)
		end)

		if bestValue[i] > bestValue[bestIndex] then
			bestIndex = i
		end
	end

	airstrikeProvider.TargetAirstrike(possibleTargets[bestIndex].CenterPosition)
	AirStrikeTimer =  DateTime.GameTime + AirStrikeChargeTime
end

GetSaboteurTargets = function(player)
	return Utils.Where(player.GetActors(), function(actor)
		return actor.HasProperty("Sell") and
			actor.Type ~= "wall" and
			actor.Type ~= "medium_gun_turret" and
			actor.Type ~= "large_gun_turret" and
			actor.Type ~= "silo"
	end)
end

BuildSaboteur = function()
	if OPalace.IsDead or OPalace.Owner ~= Ordos then
		return
	end

	local targets = GetSaboteurTargets(Harkonnen)
	if #targets > 0 then
		local saboteur = Actor.Create("saboteur", true, { Owner = Ordos, Location = OPalace.Location + CVec.New(0, 2) })
		saboteur.Move(saboteur.Location + CVec.New(0, 1))
		saboteur.Wait(DateTime.Seconds(5))

		local path = Utils.Random(SaboteurPaths)
		Utils.Do(path, function(waypoint)
			saboteur.Move(waypoint)
		end)

		SendSaboteur(saboteur)
		ScanForBetterTargets(saboteur)
	end

	Trigger.AfterDelay(DateTime.Minutes(5) + DateTime.Seconds(30), BuildSaboteur)
end

DemolishType = { "harvester", "mcv",  "siege_tank", "missile_tank", "sonic_tank", "devastator", "deviator", "combat_tank_a", "combat_tank_h", "combat_tank_o"}

ScanForBetterTargets = function(saboteur)
	if saboteur.IsDead or not saboteur.IsInWorld then return end

	local possibleTargets = Map.ActorsInCircle(saboteur.CenterPosition, WDist.FromCells(6), function(a)
		return not saboteur.Owner.IsAlliedWith(a.Owner) and
			Utils.Any(DemolishType, function(d) return d == a.Type end)
	end)

	if possibleTargets[1] == nil then
		Trigger.AfterDelay(200, function()
			ScanForBetterTargets(saboteur)
		end)
		return
	end

	-- filter out targets where infantry is nearby
	for index = #possibleTargets, 1, -1 do
		local infantryunits = Map.ActorsInCircle(possibleTargets[index].CenterPosition, WDist.New(1536), function(u) return u.Type == "light_inf" or u.Type == "trooper" end)
		if infantryunits[1] ~= nil then
			table.remove(possibleTargets, index)
		end
	end

	if possibleTargets[1] ~= nil then
		saboteur.Stop()
		local dfd = Utils.Random(possibleTargets)
		saboteur.Demolish(dfd)
		saboteur.CallFunc(function()
			ScanForBetterTargets(saboteur)
		end)
	else
		Trigger.AfterDelay(200, function()
			ScanForBetterTargets(saboteur)
		end)
	end
end

SendSaboteur = function(saboteur)
	local targets = GetSaboteurTargets(Harkonnen)
	if #targets < 1 then
		return
	end

	local target = Utils.Random(targets)
	saboteur.Demolish(target)

	-- 'target' got removed from the world in the meantime
	saboteur.CallFunc(function()
		SendSaboteur(saboteur)
	end)
end

CheckAttackToAtreides = function()
	AtreidesUnits = AtreidesNeutral.GetActors()

	Utils.Do(AtreidesUnits, function(unit)
		Trigger.OnDamaged(unit, function(self, attacker)
			if attacker.Owner == Harkonnen and not Check then
				ChangeOwner(AtreidesNeutral, AtreidesEnemy)

				-- Ensure that harvesters that was on a carryall switched sides.
				Trigger.AfterDelay(DateTime.Seconds(15), function()
					ChangeOwner(AtreidesNeutral, AtreidesEnemy)
				end)

				Check = true
				Media.DisplayMessage(UserInterface.GetFluentMessage("atreides-hostile"), Mentat)
			end
		end)
	end)
end

ChangeOwner = function(old_owner, new_owner)
	local units = old_owner.GetActors()
	Utils.Do(units, function(unit)
		if not unit.IsDead then
			unit.Owner = new_owner
		end
	end)
end

EmergencyBehaviour = function(player, target)
	HoldProduction[player] = false
	if player == Ordos and not AtreidesEnemy.HasNoRequiredUnits() then
		if AHiTechFactory.IsDead then return end
		local enemyunits = Map.ActorsInCircle(Map.CenterOfCell(target), WDist.FromCells(15), function(a)
			return a.Owner == Harkonnen
				and not a.IsDead
				and a.HasProperty("Attack")
		end)

		if enemyunits[1] == nil  then return end
		DefensiveAirStrike(AHiTechFactory, enemyunits)
	end
end

Tick = function()
	if Harkonnen.HasNoRequiredUnits() then
		Ordos.MarkCompletedObjective(KillHarkonnen1)
		AtreidesEnemy.MarkCompletedObjective(KillHarkonnen2)
	end

	if Ordos.HasNoRequiredUnits() and not Harkonnen.IsObjectiveCompleted(KillOrdos) then
		Media.DisplayMessage(UserInterface.GetFluentMessage("ordos-annihilated"), Mentat)
		Harkonnen.MarkCompletedObjective(KillOrdos)
	end

	if AtreidesEnemy.HasNoRequiredUnits() and AtreidesNeutral.HasNoRequiredUnits() and not Harkonnen.IsObjectiveCompleted(KillAtreides) then
		Media.DisplayMessage(UserInterface.GetFluentMessage("atreides-annihilated"), Mentat)
		Harkonnen.MarkCompletedObjective(KillAtreides)
	end

	if MercenaryEnemy.HasNoRequiredUnits() and MercenaryAlly.HasNoRequiredUnits() and not MercenariesDestroyed then
		Media.DisplayMessage(UserInterface.GetFluentMessage("mercenaries-annihilated"), Mentat)
		MercenariesDestroyed = true
	end

	if DateTime.GameTime % DateTime.Seconds(10) == 0 and LastHarvesterEaten[Ordos] then
		local units = Ordos.GetActorsByType("harvester")
		if #units > 0 then
			LastHarvesterEaten[Ordos] = false
			ProtectHarvester(units[1], Ordos, AttackGroupSize[Difficulty])
		end
	end

	if DateTime.GameTime % DateTime.Seconds(10) == 0 and LastHarvesterEaten[AtreidesEnemy] then
		local units = AtreidesEnemy.GetActorsByType("harvester")
		if #units > 0 then
			LastHarvesterEaten[AtreidesEnemy] = false
			ProtectHarvester(units[1], AtreidesEnemy, AttackGroupSize[Difficulty])
		end
	end
end

WorldLoaded = function()
	Ordos = Player.GetPlayer("Ordos")
	AtreidesEnemy = Player.GetPlayer("Ordos Aligned Atreides")
	AtreidesNeutral = Player.GetPlayer("Neutral Atreides")
	MercenaryEnemy = Player.GetPlayer("Ordos Aligned Mercenaries")
	MercenaryAlly = Player.GetPlayer("Harkonnen Aligned Mercenaries")
	Harkonnen = Player.GetPlayer("Harkonnen")

	InitObjectives(Harkonnen)
	KillOrdos = AddPrimaryObjective(Harkonnen, "destroy-ordos")
	KillAtreides = AddSecondaryObjective(Harkonnen, "destroy-atreides")
	AllyWithMercenaries = AddSecondaryObjective(Harkonnen, "ally-mercenaries")
	KillHarkonnen1 = AddPrimaryObjective(Ordos, "")
	KillHarkonnen2 = AddPrimaryObjective(AtreidesEnemy, "")

	Camera.Position = HMCV.CenterPosition
	OrdosAttackLocation = HMCV.Location
	MercenaryAttackLocation = HMCV.Location

	Trigger.AfterDelay(EarlyGameStage, function() AirstrikeLogic(AHiTechFactory) end)
	Trigger.AfterDelay(EarlyGameStage, BuildSaboteur)

	Trigger.OnCapture(MHeavyFactory, function()
		Harkonnen.MarkCompletedObjective(AllyWithMercenaries)
		Media.DisplayMessage(UserInterface.GetFluentMessage("mercenary-leader-captured-allied"), Mentat)
		MercenaryAttackLocation = MercenaryAttackPoint.Location

		ChangeOwner(MercenaryEnemy, MercenaryAlly)
		SendStarportReinforcements(MercenaryAlly)
		DefendAndRepairBase(MercenaryAlly, MercenaryBase, 0.75, AttackGroupSize[Difficulty])
		IdlingUnits[MercenaryAlly] = IdlingUnits[MercenaryEnemy]
	end)

	Trigger.OnKilled(MHeavyFactory, function()
		if not Harkonnen.IsObjectiveCompleted(AllyWithMercenaries) then
			Harkonnen.MarkFailedObjective(AllyWithMercenaries)
		end
	end)

	Trigger.OnKilledOrCaptured(OPalace, function()
		Media.DisplayMessage(UserInterface.GetFluentMessage("cannot-stand-harkonnen-must-become-neutral"), UserInterface.GetFluentMessage("atreides-commander"), HSLColor.FromHex("5A7394"))

		ChangeOwner(AtreidesEnemy, AtreidesNeutral)
		DefendAndRepairBase(AtreidesNeutral, AtreidesBase, 0.75, AttackGroupSize[Difficulty])
		IdlingUnits[AtreidesNeutral] = IdlingUnits[AtreidesEnemy]

		-- Ensure that harvesters that was on a carryall switched sides.
		Trigger.AfterDelay(DateTime.Seconds(15), function()
			ChangeOwner(AtreidesEnemy, AtreidesNeutral)
			CheckAttackToAtreides()
		end)
	end)

	Trigger.OnAllKilledOrCaptured(OrdosBase, function()
		Utils.Do(Ordos.GetGroundAttackers(), IdleHunt)
	end)

	Trigger.OnAllKilledOrCaptured(AtreidesBase, function()
		Utils.Do(AtreidesEnemy.GetGroundAttackers(), IdleHunt)
	end)

	Trigger.OnAllKilledOrCaptured(MercenaryBase, function()
		Utils.Do(MercenaryEnemy.GetGroundAttackers(), IdleHunt)
		Utils.Do(MercenaryAlly.GetGroundAttackers(), IdleHunt)
	end)

	local path = function() return Utils.Random(OrdosPaths) end
	local waveCondition = function() return Harkonnen.IsObjectiveCompleted(KillOrdos) end
	local huntFunction = function(unit)
		unit.AttackMove(OrdosAttackLocation)
		IdleHunt(unit)
	end

	SendCarryallReinforcements(Ordos, 0, OrdosAttackWaves[Difficulty], OrdosAttackDelay[Difficulty], path, OrdosReinforcements[Difficulty], waveCondition, huntFunction)
	SendStarportReinforcements(MercenaryEnemy)

	Actor.Create("upgrade.barracks", true, { Owner = Ordos })
	Actor.Create("upgrade.light", true, { Owner = Ordos })
	Actor.Create("upgrade.heavy", true, { Owner = Ordos })
	Actor.Create("upgrade.barracks", true, { Owner = AtreidesEnemy })
	Actor.Create("upgrade.light", true, { Owner = AtreidesEnemy })
	Actor.Create("upgrade.heavy", true, { Owner = AtreidesEnemy })
	Actor.Create("upgrade.hightech", true, { Owner = AtreidesEnemy })
	Actor.Create("upgrade.heavy", true, { Owner = MercenaryEnemy })
	Trigger.AfterDelay(0, ActivateAI)
end