-- imports

local upgrade = require("Upgrade")
local entityUtils = require("libs/EntityUtils")
local mapUtils = require("libs/MapUtils")
local unitGroupUtils = require("libs/UnitGroupUtils")
local chunkProcessor = require("libs/ChunkProcessor")
local mapProcessor = require("libs/MapProcessor")
local constants = require("libs/Constants")
local pheromoneUtils = require("libs/PheromoneUtils")
local aiDefense = require("libs/AIDefense")
local aiAttack = require("libs/AIAttack")
local aiBuilding = require("libs/AIBuilding")
local aiPlanning = require("libs/AIPlanning")
local interop = require("libs/Interop")
local tests = require("tests")

-- constants

local INTERVAL_LOGIC = constants.INTERVAL_LOGIC
local INTERVAL_PROCESS = constants.INTERVAL_PROCESS

local MOVEMENT_PHEROMONE = constants.MOVEMENT_PHEROMONE

local BASE_RALLY_CHANCE = constants.BASE_RALLY_CHANCE
local BONUS_RALLY_CHANCE = constants.BONUS_RALLY_CHANCE

local RETREAT_MOVEMENT_PHEROMONE_LEVEL = constants.RETREAT_MOVEMENT_PHEROMONE_LEVEL

-- imported functions

local getChunkByPosition = mapUtils.getChunkByPosition

local processPendingChunks = chunkProcessor.processPendingChunks

local processMap = mapProcessor.processMap
local processPlayers = mapProcessor.processPlayers
local scanMap = mapProcessor.scanMap

local planning = aiPlanning.planning

local rallyUnits = aiBuilding.rallyUnits

local deathScent = pheromoneUtils.deathScent
local victoryScent = pheromoneUtils.victoryScent

local cleanSquads = unitGroupUtils.cleanSquads
local regroupSquads = unitGroupUtils.regroupSquads
local convertUnitGroupToSquad = unitGroupUtils.convertUnitGroupToSquad

local squadAttack = aiAttack.squadAttack
local squadBeginAttack = aiAttack.squadBeginAttack

local retreatUnits = aiDefense.retreatUnits

-- local regenerateEntity = entityUtils.regenerateEntity
local addRemoveEntity = entityUtils.addRemoveEntity
local makeImmortalEntity = entityUtils.makeImmortalEntity

-- local references to global

local regionMap
local natives
local pendingChunks

-- hook functions

local function onLoad()
    regionMap = global.regionMap
    natives = global.natives
    pendingChunks = global.pendingChunks
end

local function onChunkGenerated(event)
    -- queue generated chunk for delayed processing, queuing is required because some mods (RSO) mess with chunk as they
    -- are generated, which messes up the scoring.
    if (event.surface.index == 1) then
        pendingChunks[#pendingChunks+1] = event
    end
end

local function onModSettingsChange(event)

    if event and (string.sub(event.setting, 1, 7) ~= "rampant") then
	return
    end
    
    natives.safeBuildings = settings.global["rampant-safeBuildings"].value   
    
    natives.safeEntities["curved-rail"] = settings.global["rampant-safeBuildings-curvedRail"].value
    natives.safeEntities["straight-rail"] = settings.global["rampant-safeBuildings-straightRail"].value    
    natives.safeEntities["rail-signal"] = settings.global["rampant-safeBuildings-railSignals"].value
    natives.safeEntities["rail-chain-signal"] = settings.global["rampant-safeBuildings-railChainSignals"].value
    natives.safeEntities["train-stop"] = settings.global["rampant-safeBuildings-trainStops"].value

    local poles = settings.global["rampant-safeBuildings-bigElectricPole"].value
    natives.safeEntityName["big-electric-pole"] = poles
    natives.safeEntityName["big-electric-pole-2"] = poles
    natives.safeEntityName["big-electric-pole-3"] = poles
    natives.safeEntityName["big-electric-pole-4"] = poles
    
    natives.attackUsePlayer = settings.global["rampant-attackWaveGenerationUsePlayerProximity"].value
    natives.attackUsePollution = settings.global["rampant-attackWaveGenerationUsePollution"].value
    
    natives.attackThresholdMin = settings.global["rampant-attackWaveGenerationThresholdMin"].value
    natives.attackThresholdMax = settings.global["rampant-attackWaveGenerationThresholdMax"].value
    natives.attackThresholdRange = natives.attackThresholdMax - natives.attackThresholdMin
    natives.attackWaveMaxSize = settings.global["rampant-attackWaveMaxSize"].value
    natives.attackPlayerThreshold = settings.global["rampant-attackPlayerThreshold"].value
    natives.aiNocturnalMode = settings.global["rampant-permanentNocturnal"].value
    natives.aiPointsScaler = settings.global["rampant-aiPointsScaler"].value
end

local function onConfigChanged()
    if upgrade.attempt(natives, regionMap) then
	onModSettingsChange(nil)

	game.surfaces[1].print("Rampant - Reindexing chunks, please wait")
	-- clear old regionMap processing Queue
	-- prevents queue adding duplicate chunks
	-- chunks are by key, so should overwrite old
	regionMap.processQueue = {}
	regionMap.processPointer = 1
	regionMap.scanPointer = 1
	-- clear pending chunks, will be added when loop runs below
	pendingChunks = {}

	-- queue all current chunks that wont be generated during play
	local surface = game.surfaces[1]
	for chunk in surface.get_chunks() do
	    onChunkGenerated({ surface = surface, 
			       area = { left_top = { x = chunk.x * 32,
						     y = chunk.y * 32 }}})
	end
    end    
end

local function onTick(event)
    local tick = event.tick
    if (tick == regionMap.processTick) then
	regionMap.processTick = regionMap.processTick + INTERVAL_PROCESS
	local surface = game.surfaces[1]
	local evolutionFactor = game.forces.enemy.evolution_factor
	local players = game.players
	
	processPendingChunks(natives, regionMap, surface, pendingChunks)
	scanMap(regionMap, surface, natives, evolutionFactor)

	if (tick == regionMap.logicTick) then
	    regionMap.logicTick = regionMap.logicTick + INTERVAL_LOGIC

	    planning(natives, evolutionFactor, tick, surface)

	    cleanSquads(natives, evolutionFactor)
	    -- regroupSquads(natives, evolutionFactor)
	    
	    processPlayers(players, regionMap, surface, natives, evolutionFactor, tick)
	    
	    squadBeginAttack(natives, players, evolutionFactor)
	    squadAttack(regionMap, surface, natives)
	end

	processMap(regionMap, surface, natives, evolutionFactor) 
    end
end

local function onBuild(event)
    local entity = event.created_entity
    addRemoveEntity(regionMap, entity, natives, true, false)
    if natives.safeBuildings then
	if natives.safeEntities[entity.type] or natives.safeEntityName[entity.name] then
	    entity.destructible = false
	end
    end
end

local function onPickUp(event)
    addRemoveEntity(regionMap, event.entity, natives, false, false)
end

local function onDeath(event)
    local entity = event.entity
    local surface = entity.surface
    if (surface.index == 1) then
        if (entity.force.name == "enemy") then
            if (entity.type == "unit") then
                local entityPosition = entity.position
		local deathChunk = getChunkByPosition(regionMap, entityPosition.x, entityPosition.y)
		
		if (deathChunk ~= nil) then
		    -- drop death pheromone where unit died
		    deathScent(deathChunk)
		    
		    if ((event.force ~= nil) and (event.force.name == "player")) then
			local evolutionFactor = game.forces.enemy.evolution_factor
			local tick = event.tick

			if (deathChunk[MOVEMENT_PHEROMONE] < -(evolutionFactor * RETREAT_MOVEMENT_PHEROMONE_LEVEL)) then
			    retreatUnits(deathChunk, 
					 convertUnitGroupToSquad(natives, 
								 entity.unit_group),
					 regionMap, 
					 surface, 
					 natives,
					 tick)
			    local rallyThreshold = BASE_RALLY_CHANCE + (evolutionFactor * BONUS_RALLY_CHANCE)
			    if (math.random() < rallyThreshold) then
				rallyUnits(deathChunk,
					   regionMap,
					   surface,
					   natives,
					   evolutionFactor,
					   tick)
			    end
			end
		    end
                end
                
                -- removeScout(entity, natives)
            elseif (entity.type == "unit-spawner") or (entity.type == "turret") then
                addRemoveEntity(regionMap, entity, natives, false, false)
            end
        elseif (entity.force.name == "player") then
	    local creditNatives = false
	    local entityPosition = entity.position
	    if (event.force ~= nil) and (event.force.name == "enemy") then
		creditNatives = true
		local victoryChunk = getChunkByPosition(regionMap, entityPosition.x, entityPosition.y)
		victoryScent(victoryChunk, entity.type)
	    end
	    if creditNatives and natives.safeBuildings and (natives.safeEntities[entity.type] or natives.safeEntityName[entity.name]) then
		makeImmortalEntity(surface, entity)
	    else
		addRemoveEntity(regionMap, entity, natives, false, creditNatives)
	    end
        end
    end
end

local function onSurfaceTileChange(event)
    -- local player = game.players[event.player_index]
    -- if (player.surface.index==1) then
    -- aiBuilding.fillTunnel(global.regionMap, player.surface, global.natives, event.positions)
    -- end
end

local function onInit()
    global.regionMap = {}
    global.pendingChunks = {}
    global.natives = {}
    
    regionMap = global.regionMap
    natives = global.natives
    pendingChunks = global.pendingChunks
    
    onConfigChanged()
end

-- hooks

script.on_init(onInit)
script.on_load(onLoad)
script.on_event(defines.events.on_runtime_mod_setting_changed,
		onModSettingsChange)
script.on_configuration_changed(onConfigChanged)

script.on_event(defines.events.on_player_built_tile, onSurfaceTileChange)

script.on_event({defines.events.on_preplayer_mined_item,
                 defines.events.on_robot_pre_mined}, 
    onPickUp)
script.on_event({defines.events.on_built_entity,
                 defines.events.on_robot_built_entity}, 
    onBuild)

script.on_event(defines.events.on_entity_died, onDeath)
script.on_event(defines.events.on_tick, onTick)
script.on_event(defines.events.on_chunk_generated, onChunkGenerated)

remote.add_interface("rampantTests", {
			 test1 = tests.test1,
			 test2 = tests.test2,
			 test3 = tests.test3,
			 test4 = tests.test4,
			 test5 = tests.test5,
			 test6 = tests.test6,
			 test7 = tests.test7,
			 test8 = tests.test8,
			 test9 = tests.test9,
			 test10 = tests.test10,
			 test11 = tests.test11
})

remote.add_interface("rampant", interop)