Rampant/libs/MapProcessor.lua

local mapProcessor = {}

-- imports

local pheromoneUtils = require("PheromoneUtils")
local aiBuilding = require("AIBuilding")
local constants = require("Constants")
local mapUtils = require("MapUtils")
local nocturnalUtils = require("NocturnalUtils")

-- constants

local PROCESS_QUEUE_SIZE = constants.PROCESS_QUEUE_SIZE
local ENEMY_BASE_PHEROMONE_GENERATOR_AMOUNT = constants.ENEMY_BASE_PHEROMONE_GENERATOR_AMOUNT

local RETREAT_MOVEMENT_PHEROMONE_LEVEL = constants.RETREAT_MOVEMENT_PHEROMONE_LEVEL

local SCAN_QUEUE_SIZE = constants.SCAN_QUEUE_SIZE

local AI_UNIT_REFUND = constants.AI_UNIT_REFUND
local CHUNK_SIZE = constants.CHUNK_SIZE
local AI_STATE_AGGRESSIVE = constants.AI_STATE_AGGRESSIVE
local AI_STATE_NOCTURNAL = constants.AI_STATE_NOCTURNAL

local PROCESS_PLAYER_BOUND = constants.PROCESS_PLAYER_BOUND
local CHUNK_TICK = constants.CHUNK_TICK

local CHUNK_BASE = constants.CHUNK_BASE

local AI_MAX_POINTS = constants.AI_MAX_POINTS
local AI_SQUAD_COST = constants.AI_SQUAD_COST
local AI_VENGENCE_SQUAD_COST = constants.AI_VENGENCE_SQUAD_COST

local MOVEMENT_PHEROMONE = constants.MOVEMENT_PHEROMONE
local PLAYER_BASE_GENERATOR = constants.PLAYER_BASE_GENERATOR
local BUILDING_PHEROMONES = constants.BUILDING_PHEROMONES

-- imported functions

local scents = pheromoneUtils.scents
local processPheromone = pheromoneUtils.processPheromone

local formSquads = aiBuilding.formSquads

local getChunkByIndex = mapUtils.getChunkByIndex
local getChunkByPosition = mapUtils.getChunkByPosition

local playerScent = pheromoneUtils.playerScent

local canAttackNocturnal = nocturnalUtils.canAttack

local mMin = math.min

-- module code

local function nonRepeatingRandom(players)
    local ordering = {}
    for _,player in pairs(players) do
	ordering[#ordering+1] = player.index
    end
    for i=#ordering,1,-1 do
	local s = math.random(i)
	local t = ordering[i]
	ordering[i] = ordering[s]
	ordering[s] = t
    end
    return ordering
end

--[[
    processing is not consistant as it depends on the number of chunks that have been generated
    so if we process 400 chunks an iteration and 200 chunks have been generated than these are
    processed 3 times a second and 1200 generated chunks would be processed once a second
    In theory, this might be fine as smaller bases have less surface to attack and need to have 
    pheromone dissipate at a faster rate.
--]]
function mapProcessor.processMap(regionMap, surface, natives, evolution_factor)
    local roll = regionMap.processRoll
    local index = regionMap.processPointer
    local squads = false
    
    if (index == 1) then
        roll = math.random()
        regionMap.processRoll = roll
    end
    
    if ((natives.state == AI_STATE_AGGRESSIVE) or canAttackNocturnal(natives, surface)) and (0.11 <= roll) and (roll <= 0.35) then
	squads = true
    end
    
    local processQueue = regionMap.processQueue
    local endIndex = mMin(index + PROCESS_QUEUE_SIZE, #processQueue)
    for x=index,endIndex do
        local chunk = processQueue[x]
	
	processPheromone(regionMap, chunk)

        if squads then
            formSquads(regionMap, surface, natives, chunk, evolution_factor, AI_SQUAD_COST)
        end        
	
        scents(chunk)
    end
    
    if (endIndex == #processQueue) then
        regionMap.processPointer = 1
    else
        regionMap.processPointer = endIndex + 1
    end
end

--[[
    Localized player radius were processing takes place in realtime, doesn't store state
    between calls.
    vs 
    the slower passive version processing the entire map in multiple passes.
--]]
function mapProcessor.processPlayers(players, regionMap, surface, natives, evolution_factor, tick)
    -- put down player pheromone for player hunters
    -- randomize player order to ensure a single player isn't singled out
    local playerOrdering = nonRepeatingRandom(players)

    local squads = false
    local vengenceThreshold = -(evolution_factor * RETREAT_MOVEMENT_PHEROMONE_LEVEL)
    local roll = math.random() 

    if ((natives.state == AI_STATE_AGGRESSIVE) or canAttackNocturnal(natives, surface)) and (0.11 <= roll) and (roll <= 0.20) then
	squads = true
    end
    
    for i=1,#playerOrdering do
	local player = players[playerOrdering[i]]
	if (player ~= nil) and player.connected and (player.character ~= nil) and player.character.valid and (player.character.surface.index == 1) then 
	    local playerPosition = player.character.position
	    local playerChunk = getChunkByPosition(regionMap, playerPosition.x, playerPosition.y)
	    
	    if (playerChunk ~= nil) then
		playerScent(playerChunk)
	    end
	end
    end
    for i=1,#playerOrdering do
	local player = players[playerOrdering[i]]
	if (player ~= nil) and player.connected and (player.character ~= nil) and player.character.valid and (player.character.surface.index == 1) then 
	    local playerPosition = player.character.position
	    local playerChunk = getChunkByPosition(regionMap, playerPosition.x, playerPosition.y)
	    
	    if (playerChunk ~= nil) then
		local vengence = false
		if ((playerChunk[ENEMY_BASE_GENERATOR] ~= 0) or (playerChunk[MOVEMENT_PHEROMONE] < vengenceThreshold)) and
		(natives.state == AI_STATE_AGGRESSIVE or canAttackNocturnal(natives, surface)) then
		    vengence = true
		end
		for x=playerChunk.cX - PROCESS_PLAYER_BOUND, playerChunk.cX + PROCESS_PLAYER_BOUND do
		    for y=playerChunk.cY - PROCESS_PLAYER_BOUND, playerChunk.cY + PROCESS_PLAYER_BOUND do
			local chunk = getChunkByIndex(regionMap, x, y)
			
			if (chunk ~= nil) and (chunk[CHUNK_TICK] ~= tick) then
			    chunk[CHUNK_TICK] = tick

			    processPheromone(regionMap, chunk)
			    
			    if squads then
				formSquads(regionMap, surface, natives, chunk, evolution_factor, AI_SQUAD_COST)
			    end
			    if vengence then
				formSquads(regionMap, surface, natives, chunk, evolution_factor, AI_VENGENCE_SQUAD_COST)
			    end

			    scents(chunk)

			end
		    end
		end
	    end
	end
    end
end

--[[
    Passive scan to find entities that have been generated outside the factorio event system
--]]
function mapProcessor.scanMap(regionMap, surface, natives, evolution_factor)
    local index = regionMap.scanPointer
    
    local processQueue = regionMap.processQueue
    local endIndex = mMin(index + SCAN_QUEUE_SIZE, #processQueue)
    for x=index,endIndex do
	local chunk = processQueue[x]

	local entities = surface.find_entities_filtered({area = {{chunk.pX, chunk.pY},
							     {chunk.pX + CHUNK_SIZE, chunk.pY + CHUNK_SIZE}},
							 force = "player"})
	
	local spawners = surface.count_entities_filtered({area = {{chunk.pX, chunk.pY},
							      {chunk.pX + CHUNK_SIZE, chunk.pY + CHUNK_SIZE}},
							  type = "unit-spawner",
							  force = "enemy"})

	local worms = surface.count_entities_filtered({area = {{chunk.pX, chunk.pY},
							   {chunk.pX + CHUNK_SIZE, chunk.pY + CHUNK_SIZE}},
						       type = "turret",
						       force = "enemy"})
	
	local unitCount = surface.count_entities_filtered({area = {{chunk.pX, chunk.pY},
							       {chunk.pX + CHUNK_SIZE, chunk.pY + CHUNK_SIZE}},
							   type = "unit",
							   force = "enemy"})

	if (unitCount > 550) then
	    local weight = AI_UNIT_REFUND * evolution_factor
	    local units = surface.find_enemy_units({chunk.pX, chunk.pY},
		CHUNK_SIZE * 3)

	    for i=1,#units do
		units[i].destroy()
		natives.points = natives.points + weight
	    end

	    if (natives.points > (AI_MAX_POINTS * 3)) then
		natives.points = (AI_MAX_POINTS * 3)
	    end
	end

	local playerBaseGenerator = 0
	for i=1,#entities do
	    local entity = entities[i]
	    local value = BUILDING_PHEROMONES[entity.type]
	    if (value ~= nil) then
		playerBaseGenerator = playerBaseGenerator + value
	    end
	end

	--chunk[ENEMY_BASE_GENERATOR] = (spawners * ENEMY_BASE_PHEROMONE_GENERATOR_AMOUNT) + worms
	chunk[PLAYER_BASE_GENERATOR] = playerBaseGenerator
    end

    if (endIndex == #processQueue) then
	regionMap.scanPointer = 1
    else
	regionMap.scanPointer = endIndex + 1
    end
end

return mapProcessor